34X Service Manual HA245946 Iss4

8/4/2019 34X Service Manual HA245946 Iss4

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EU R O TH ER M

3

40

SERIES

Service Manual


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340 SERIES SERVICE MAN UAL

Page 1HA245946Issue 4 Jly 00

340 SERIES SERVICE M AN UAL

LIST OF CON TEN TS

Section page

SAFETY NOTES ........ ........ ......... ......... ........ ......... ........ ......... .... 2

SYMBOLS USED ON THE RECORDER LABELLING ... ..... ... ... ... ... ... .. 2

SECTION 1 OVERVIEW ................... ...................... .......... 3

1.1 INTRODUCTION ................................................................ 3

1.2 MAN UAL STRUCTURE ........ ......... ......... ........ ......... ........ ..... 3

1.3 ELECTROSTATIC DISCHARGE .... .... .... .... ... .... .... .... .... .... ... .... 3

1.3.1 Handling precautions..... .............. .............. .............. .............. 3

1.3.2 Terminology ............. .............. .............. .............. .............. ..... 4ANTI-STATIC ............ ............ ............ ............ ............ ............ . 4STATIC SAFE ............ ............ ............ ............. ............ ........... 4

SECTION 2 PREVEN TIVE M AIN TEN AN CE ..... ..... ..... ..... ..... 5

2.1 INTRODUCTION ................................................................ 5

2.2 ROLL/ Z-FOLD CASSETTE (YEARLY) .... .... .... .... .... ... .... .... .... .... 5

2.3 PEN TRAYS (YEARLY) ......... ........ ......... ........ ......... ......... ...... 5

2.3.1 Models 342A and 344 ........................................................... 6PEN ADJUSTMENTS........... ........... ............ ........... ........... ...... 7

2.3.2 Models 342D and 345 .......................................................... 8AN NOTATOR DOTTING HEAD ADJUSTMENT .... .... .... ... .... .... . 8

2.3.3 Model 346 ........................................................................... 9DOTTING HEAD ADJUSTMENT............... .......... ......... .......... .. 10

SECTION 3 DRIVE CORD REPLACEM EN T ... ... ... ... ... ... ... ... .. 11

3.1 INTRODUCTION ................................................................ 11

3.2 MODEL 342/ 344/ 345 CHANN EL PEN TRAY RE-CORDING .. 11

3.3 ANNOTATOR TRAY RE-CORDING ........ ......... ........ ......... ..... 14RE-CORDING PROCEDURE... .... .... .... .... .... .... .... .... .... .... .... .... . 14

3.4 MODEL 346 PEN TRAY RECORDING ........ ........ ......... ......... . 16RE-CORDING PROCEDURE... .... .... .... .... .... .... .... .... .... .... .... .... . 16

SECTION 4 DISPLAY RIBBON REPLACEM EN T ... ... ... ... ... ... . 19

4.1 INTRODUCTION ................................................................ 19

4.2 RIBBON REMO VAL PROCEDURE .... .... .... .... .... .... .... .... .... .... . 19

4.3 RIBBON REPLACEMENT PROCEDURE .... .... .... .... .... .... .... .... .. 20

4.4 DISPLAY RIBBON ADJUSTMENT...... .... .... .... .... .... .... .... .... .... . 21

INDEX ..................................................................................... 22

LIST OF EFFECTIVE PAGES .... .... .... .... .... .... .... .... .... .... .... .... .... .... . 22


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340 SERIES SERVICE MANUAL

HA245946Issue 4 Jly 00Page 2

SAFETY NOTES

1. Before any other connection is made, the protective earth terminal shall be connected to a protective con-

ductor. The Mains (supply voltage) wiring must be terminated in such a way that, should it slip in the cable

clamp, the Earth wire would be the last wire to become disconnected.

2. In the case of portable equipment, the protective earth terminal must remain connected (even if the recorder is

isolated from the mains supply), if any of the I/O circuits are connected to hazardous voltages*.

WARNING!

Any interruption of the earth terminal inside or outside the apparatus, or disconnection of the protec-

tive earth terminal is likely to make the apparatus dangerous under some fault conditions. Intentional

interruption is prohibited.

Note: In order to comply with the requirements of safety standard BS EN61010, recorders without on-

off switches shall have one of the following as a disconnecting device, fitted within easy reach of the

operator, and labelled as the disconnecting device.

a. A switch or circuit breaker which complies with the requirements of IEC947-1 and IEC947-3

b. A separable coupler which can be disconnected without the use of a tool

c. A separable plug, without a locking device, to mate with a socket outlet in the building

3. Whenever it is likely that protection has been impaired, the unit shall be made inoperative and secured against

unintended operation. The nearest manufacturers service centre should be consulted for advice.

4. Any adjustment, maintenance and repair of the opened apparatus under voltage, should be avoided as far as possi-

ble and, if inevitable, shall be carried out only by a skilled person who is aware of the hazard involved.

5. Where conductive pollution (e.g. condensation, carbon dust) is likely, adequate air conditioning/filtering/sealing

etc. must be installed in the recorder enclosure.

6. Signal and supply voltage wiring should be kept separate from one another. Where this is impractical, shielded

cables should be used for the signal wiring.

7. If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment

might be impaired.

8 Before switching on the apparatus, ensure that it is set to the voltage of the power supply.

* A full definition of Hazardous voltages appears under Hazardous Live in BS EN61010. briefly, under normal

operating conditions, hazardous voltages are defined as > 30V RMS (42.2V peak) or > 60V dc.

SYM BOLS USED ON THE RECORDER LABELLIN G

One or more of the symbols below may appear on the recorder labelling.

! Refer to the Manual for instructions

Protective Earth

This recorder for ac supply only

This recorder for dc supply only.

Risk of electric shock

Supply voltage on /off switch.

1 = on; O = off

This recorder for either ac or dc supply

0

1


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SECTION 1 OVERVIEW

1.1 INTRODUCTION

This manual is intended as an aid to those involved in the routine servicing of recorder models 342, 344, 345 and

346. Unless otherwise stated the information contained in this document applies to all the above models.

It is assumed that the user of the manual is familiar with the recorder to at least the extent that the removal of the re-

corder chassis from the case, and of the cassette and the chart need not be described.

1 .2 M AN UAL STRUCTURE

The manual is in four main sections as follows:

Section 1: Overview. Describes the manual and its use.

Section 2: Preventive maintenance. Describes periodic checks required to maintain the recorder in optimum condi-

tion.

Section 3: Drive cord replacement and adjustment. Shows drive-cord replacement/adjustment procedures for pen

trays.

Section 4: Display ribbon replacement. This section gives instructions on how to replace ribbons for models 342

and 344, and how to align them with the chart or scale.

1 .3 ELECTROSTATIC DISCHARGE

CAUTION

All the recorders in the series contain electronic devices that can be damaged by electrostatic discharge.

Appropriate static precautions should be taken before any recorder is dismantled.

1 .3 .1 Ha ndling precautions

High voltages (tens of kilo-volts) can be generated on the human skin through a number of mechanisms, such as fric-

tion between different materials (e.g. nylon and skin), or a separation of similar materials (e.g. nylon sheet, masking

tape). The gate-oxide region of all metal oxide semiconductors (MOS) is extremely thin and can be damaged by

voltages as low as 60 Volts. Modern MOS devices have built-in clamp diodes which reduce the incidence of obvious

damage considerably. It is possible, however, even with such clamping diodes, to produce a small rupture in the oxide

layer. This might not destroy the device immediately, but it may result in a gradual reduction in the performance of

the device, until eventually, it fails. For thus reason, the precautions listed below should be taken when handling any

340 series circuit board or associated metalwork etc.


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1 .3 .1 HAN DLIN G PRECAUTION S (Cont.)

1. Personnel handling MOS devices, or circuit boards containing them, should wear anti-static materials such as

cotton. In particular, nylon clothing should be avoided.

2. All bench tops should be covered with conductive material (104 to 105 Ohms per square) maintained at recorder

chassis potential.

3. Circuit boards removed from the recorder should be placed in a static safe bag for short term storage*

4. Personnel handling MOS devices, or circuit boards containing them, should wear a wrist strap connected (Via a

safety resistor) to the bench top conductive covering, or if appropriate, to a convenient point of the recorder chas-

sis or pen tray.

5. Leads of MOS devices not in circuit should be shorted together using conductive foam or similar.

6. MOS devices should not be extracted from, or inserted into circuit, whilst the circuit has power applied.

1.3.2 Terminology

AN TI-STATIC

This term means that the material in question does not itself generate static electricity. Such materials do not give

protection against external electric fields.

STATIC SAFE

This means that the material in question a) does not generate static electricity, and b) any device enclosed in such

material is safe from the effects of external electric fields.*

*Note: Because of the conductive nature of static-safe materials, consideration should be given to the

shape of any anti-static container used for long term storage of any circuit containing one or more drycells (batteries).


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SECTION 2 PREVEN TIVE M AIN TEN AN CE

2.1 INTRODUCTION

This section describes periodic checks that should be carried out in order to maintain the recorder in optimum condi-

tion. If the environment is particularly dirty (e.g. the air contains abrasive particulate matter), then the scheduled time

periods may need to be revised.

2 .2 ROLL/ Z-FOLD CASSETTE (YEARLY)

Note: No lubrication is necessary on the cassette

1. Remove the cassette and remove the chart from the cassette.

2. Use a small, stiff brush to clear the gear trains of paper and other dust and debris.

3. Ensure that all screws are fully tightened.

4. If necessary, use a petroleum-based cleaning fluid to remove ink from the platen and sprocket roller.

5. Return the cassette to the recorder and ensure that it latches correctly. If not, adjust the latch bar to fit.

6. Remove the cassette and fit the chart as shown in the Installation and Operation manual. Re-fit the cassette.

2 .3 PEN TRAYS (YEARLY)

Notes

1. No lubrication is necessary on the pen tray.

2. After re-fitting the pen trays after cleaning, it is recommended that the pens/dotting head are

recalibrated as described in the relevant installation and operation manual. For some models this

requires the hand-held programmer option.

Caution

This procedure involves the removal and refitting of circuit boards which contain components suscepti-

ble to electro-static discharge. Before starting, ensure that a suitable static-safe area is available for the

short-term storage of these boards.

Caution

No side forces should be applied to the pens or pen mountings. When the pen has to be moved whilst

carrying out the following procedure, the cord capstan should be used whenever possible. If the cord is

broken, and here is no alternative, then the pen carriage may be moved by applying gentle sideways

pressure to the pen cartridge AS CLOSELY AS POSSIBLE TO THE GUIDE RAILS.


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2 .3 PEN TRAYS (Cont. )

2.3.1 M odels 34 2A and 34 4

With reference to figure 2.3.1a below, remove the pen tray(s) from the recorder chassis as follows:

1. Release the chart illumination unit (if fitted) by removing its four securing screws. The unit may be left to hang

on its harness, but care must be taken to avoid damage to the fluorescent tube.

2. Remove the plastic cover fitted over the display ribbons by gently prising it open using finger pressure.3. Remove the three retaining screws (A in the figure below).

4. Open the hinged circuit board retainer, and pull the top board (if fitted) out slightly to allow finger access to the

electrical connectors which link the board to the top pen tray. Remove the top circuit board and place it in a

static-safe area, carefully identifying it as channel 3.

5. Remove the other pen trays in a similar way, including the annotator tray (if fitted). Ensure that all circuit boards

are adequately identified and protected against static damage.

Figure 2.3 .1a Pen tray removal - models 342, 344

For each pen tray:

6. Carefully remove all paper dust etc. with a soft brush. Make a visual inspection of the pen drive-cord and displayribbon for signs of wear. If necessary replace the drive cord and/or ribbon as described in sections 3 and 4 respec-

tively, of this manual.

7. Check that the pen carriage guide-rails are clean and bright. Use the cord capstan to move the pen carriage from

one end of its travel to the other, to check that it is free to move over its complete range. Leave the pen at the

extreme right-hand end of travel.

8. With the pen carriage at its right-hand end of travel, use a Correx gauge, at the centre of the pen drive-cord span,

across the front of the tray, to deflect the cord 2mm. The acceptable range is 6 to 9 cN (centi-Newtons). If the

Correx reading lies outside this range, use the tension adjustment arm to correct it, or if necessary, replace the

drive cord as described later in this manual.

B

A

A

A

Chart illumination unit

Circuit boardretainer


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2.3 .1 M odels 34 2A a nd 34 4 (Cont.)

When all the pen trays have been checked, return them and their associated input boards to the recorder chassis, con-

necting each tray to its input board as it is fitted. Fit the annotator tray or channel 0 (if either is fitted) first; then chan-

nel 1 (blue), followed by channels two (red) and three (green). Ensure that all the circuit boards are correctly located

in their guides.

Re-fit the three securing screws (A in figure 2.3.1a).

Re-fit the chart illumination unit (if fitted).

Locate the fixing slots in the top of the plastic cover over the lugs in the channel 3 display ribbon moulding, and gen-

tly, but firmly, push the bottom of the cover inwards until it clicks into position. Ensure that the fixing slots are lo-

cated over the lugs in the bottom of the channel one display ribbon moulding.

Return the recorder to its case and re-fit the cassette and pens.

PEN ADJUSTM EN TS

CHANNEL PEN POSITION

Apply power and check that the pens travel freely across the chart without fouling one another. If the pens do foul,

remove the relevant tray(s) and release the screw in the underside of the pen carriage, to allow the pen to be moved

slightly backwards or forwards as required.

Re-fit the pen trays and repeat the check.

Note: The specified inter-pen tip spacing (up/down the chart, not across) is 2 mm.

CHANNEL PEN PRESSURE

Use a Correx gauge at the front edge of the of the pen moulding, to lift the pen. The reading should be between 5 and

7 centi-Newtons for channel pens. If the reading is incorrect, adjust screw B (figure 2.3.1a) for the channel, to in-

crease or decrease the pressure as required.

Pen

Guide barFlexi

Adjustmentscrew

BD234913G

Annotator forceadjustment

Figure 2.3.1b Annotator pen height adjustment Figure 2.3.1c Annotator pen force adjustment

ANNOTATOR DOTTING HEAD ADJUSTMENT

Use feeler gauges to ensure that the pen-to-chart dis-

tance lies between 1.1 and 1.4 mm. If not use the ad-

justment screw (figure 2.3.1b) on the underside of the

annotator pen carriage to set the height.

Use the adjustment potentiometer, located as shown, to set

the dotting pressure to give optimum printing quality. If

too high a pressure is set, the usable pen life will be re-

duced.

Use a clockwise rotation to increase force; anti- (counter)

clockwise rotation to reduce force.


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2.3.2 M odels 34 2D and 34 5

1. Open the display, and inspect the hinge to observe the location of the hinge spring (figure 2.3.2). With a small

screwdriver, or similar, prise the display hinge pin upwards, from the bottom, until it protrudes sufficiently at the

top for it to be pulled out either by hand, or using a small pair of snipe-nosed pillars. Allow the display to hang

on its cable harness.

2. Continue from step 2 ofsection 2.3.1 above, up until the final stage of re-assembly, noting that the Model 345

may also be fitted with an annotator tray.

When re-assembling, ensure that the hinge spring is correctly located when the hinge pin is inserted (figure 2.3.2b

above).

3. Check pen pressure and pen separation as described in section 2.3.1.

AN N OTATOR DOTTIN G H EAD ADJUSTM EN T

PEN HEIGHT

Use feeler gauges to check that the pen-to-chart distance lies between 1.1 and 1.4 mm inclusive. If it lies outside this

range, use the adjustment screw on the underside of the annotator pen carriage (figure 2.3.1b), to set the height.

DOTTING FORCE (MODEL 342D)

Carry out the adjustment as detailed for Models 342A/344 above, in section 2.3.1.

DOTTING FORCE (MODEL 345)

1. Enter the Calibration menu and select Ann. Carriage.

2. With the pen tip slowly dotting at the left-hand end of travel, remove the cassette and place the probe of a Correx

gauge under the pen tip. Check that the reading lies between 6 and 9 cN inclusive.

3. If the measured force is incorrect, use the adjustment potentiometer (figure 2.3.1c) as described in section 2.3.1,

above.

Figure 2.3.2a Display removal

Figure 2.3.2b Hinge spring detail


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2.3.3 Model 34 6

1. Remove the electrical connectors attached to the pen tray circuit board.

2. Release the pen tray by turning the knurled knob (fig2.3.3a) anti-clockwise (counter-clockwise) and remove the

tray.

3. Remove the three fixing screws (A in figure 2.3.3b) and any associated washers, to gain access to the drive cord.Remove the motor.

4. Carefully remove all paper dust etc. with a soft brush and (if available), low pressure air. Make a visual inspec-

tion of the drive cord and, if necessary, replace it as described later in this manual.

5. Check that the pen carriage guide rails are clean and bright. Use the cord capstan to move the pen carriage for

one end of its travel to the other to check that it is free to move over its complete range.

6. Leave the pen at its extreme right-hand end of travel.

7. With the pen carriage at its right-hand end of travel, use a Correx gauge (at the centre of the pen drive-cord span,

across the front of the tray) to deflect the cord 2mm. The acceptable range is 20 to 25cN inclusive. If the Correx

deflection lies outside this range, use the tension arm to correct the tension, or replace the drive cord as described

later in this manual.

8. Carefully return the motor to the pen ray and, ensuring that it meshes correctly, secure it using two of the three

screws previously removed. Use the third screw to complete the re-assembly of the pen tray, releasing the motor

screws slightly if necessary. Once all the screws are fitted, tighten them fully, again ensuring that the motor is

correctly meshed.

9. Re-fit the motor connector

10. Return the pen tray to the chassis and remake the electrical connectors.

Knurled knob

Dotting force

adjustment pot.

Figure 2.3 .3a Pen tray removal - model 346


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Figure 2.3.3b Access to Model 346 drive cord

DOTTIN G HEAD ADJUSTM EN T

PEN HEIGHT

Use feeler gauges to ensure that the pen-to-chart separation height (whilst not dotting) is between 1.1 and 1.4 mm

inclusive. If not use the cord clamp screw (figure 3.4a) to adjust the pen tip height appropriately. Once the correct

tip-height has been achieved, the cord clamp nut should be used as a lock nut a) to secure the cord clamp, and b) to

lock the pen height adjustment screw.

DOTTING FORCE

1. Enter the Calibration menu and select Ann. Carriage.

2. With the pen tip slowly dotting at the left-hand end of travel, remove the cassette and place the probe of a Correx

gauge under the pen tip. Check that the reading lies between 6 and 9 cN inclusive.3. If the measured force is incorrect, use the adjustment potentiometer located on the pen drive circuit board, as

shown in figure 2.3.3a, above.. A clockwise rotation increases the dotting force, and vice-versa.

A

A

A


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New cord

'U'-shaped puller

Ferrules

SECTION 3 DRIVE CORD REPLACEM EN T

3.1 INTRODUCTION

This section describes how to replace drive cords on Model 342, 344, 345 and 346 recorder pen trays. See section 2,

above, for disassembly instructions showing how to gain access to the pen trays. Once the pen trays have been re-

corded, the pen adjustment procedure detailed in Section 2, should be carried out.

Caution

No side forces should be applied to the pens or pen mountings. When the pen has to be moved whilst

carrying out the following procedure, the cord capstan should be used whenever possible. If the cord is

broken, and here is no alternative, then the pen carriage may be moved by applying gentle sideways

pressure to the pen cartridgeAS CLOSELY AS POSSIBLE TO THE GUIDE RAILS.

3 .2 M ODEL 34 2 / 344 / 345 CHAN N EL PEN TRAY RE-CORDIN G

Notes:

1. This procedure applies only to channel pen trays. A procedure for annotator pen trays is given

below in section 3.32. A kit (LA245950) is available from the manufacturer containing a length of cord and two ferrules,

sufficient for one pen tray.

3. Unless otherwise stated, directions (left, right etc.) are given assuming the pen tray arms are facing

the operator, with the cord capstan upwards and the motor protruding under the pen tray.

1. Remove the cord-clamping screw from the pen carriage, retaining the screw and clamp for later re-assembly.

2. Remove the cord, by pulling the ferrule and attached cord segments out of the cord capstan.

3. Inspect the capstan and cord pulleys, and clean them if necessary. Ensure that the pulleys rotate freely.

4. Release the screw which secures the tensioning arm, and move the arm forwards, towards the pen tray arms.

5. Take the replacement cord, and cut it to length, as follows:

Channel 0: 540 to 545 mm




6. Knot the ends of the cord together (no more than

20 mm. from the ends) to form a loop.

7. Pass the loop through the two ferrules supplied with

the kit, using a u-shaped piece of thin strong wire to

pull the cord through. Slide the ferrules along the cord to

the knot

8. In a similar way, pass the loop through the hole in the capstan,

from the inside of the capstan. Pull the cord through until it is stopped by the

ferrules acting on the knot.

9. Ensure that the cord is free of twists. Pull the cord tight, and hold it with the right hand, ap-

proximately 5 cm. from the capstan.

10. With the left hand, route the other side of the cord round the two pulleys on the left hand arm. Maintain tension

in the cord, to prevent it slipping off.

11. With the right hand part of the cord, make two complete anticlockwise (counter clockwise) turns round the cap-

stan. Whilst maintaining tension in the cord, ensure that it has wrapped neatly round the capstan, without any

overlaps.

12. Wind the right hand part of the cord round the two pulleys in the right hand side arm of the pen tray.

13. Whilst maintaining sufficient tension in the cord to stop it slipping off any of the pulleys, pull the knotted end of

the cord back through the ferrules, until the cord is taut. Slide the ferrules into the capstan then crimp one of

them just enough to pinch the cord so that it does not slide easily.


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RE-CORDIN G PROCEDURE (Cont.)

14. Rotate the capstan and check that the cord winds on and off neatly. Rotate the capstan fully clockwise until it is

stopped by the cord. Rotate the capstan anticlockwise until just before the cord stops coming off the capstan

tangentially, and check that the hole in the capstan is facing (approximately) the front of the tray.

15. Carefully move the pen carriage to the right hand end of its travel. Clamp the cord onto the pen carriage using

the screw and clamp plate previously removed. DO NOT OVER TIGHTEN. An 0.1 Nm torque driver should be

used if available.

Note: The cord should lie underneath the clamp, on the side nearest the front of the pen tray.

16. Rotate the capstan to move the carriage over its entire range. Check that the cord is always tangential with the

capstan. If not, release the clamp and slide the pen carriage along the cord slightly. Repeat until the cord remains

tangential with the capstan. Leave the pen at the right-hand end of its travel.

17 With the pen carriage at the right-hand end of its travel, apply the probe of a Correx gauge to the mid point of the

cord span across the front of the pen tray, and deflect the cord 2 mm. The reading should lie between 6 and 9

cN inclusive.

18. If the cord is too tight, pull an extra millimetre or so through the ferrules to reduce the tension and repeat steps

16 and 17.

19 If the cord is too loose, move the tensioning arm backwards to increase it, and repeat steps 16 and 17.

20 With the cord tension between 6 and 9 cN, crimp the two ferrules as tightly as possible, and cut off the remaining

cord containing the knot.

Figures 3.1a and 3.1b below show the cording route for channel pen trays. Channels 0 (Model 342D only), 1 and 3

are identical except for slight differences in motor position.


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Figure 3.2a Cording route for models 342, 344 , 345: Channels 0, 1 and 3

Figure 3.2b Cording route for models 342, 344, 345: Channel 2

Tensioning arm

Tensioning arm


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Figure 3.3a cord tensioning arm detail

Cordtensioning arm

PulleyCord

Cord MUST beclear of screw head

3 .3 AN N OTATOR TRAY RE-CORDING

Notes:

1 A suitable drive cord kit (LA245957) is available from the manufacturer.

2. Unless otherwise stated, directions (left, right etc.) are given assuming the pen tray arms facing

the operator and the cord capstan upwards (i.e. the motor protrudes under the pen tray).

RE-CORDIN G PROCEDURE1. Rotate the tensioning arm clockwise, as far as possible (minimum tension position). Remove the cord (cutting it

if necessary) by pulling the knotted ends up out of the pen carriage tow points, removing the ferrule and pulling

the cord free of the capstan.

2. Make a visual inspection of the capstan and cord pulleys, and clean them if necessary. Ensure that the pulleys are

free to rotate.

3. Ensure that the knots in the ends of the new cord are tight.

4. Take the new cord, and using a U shaped piece of thin, strong wire as a puller, at or near the centre of the cord,

thread a loop of cord approximately 6 cm long through the hole in the side of the capstan from the outside, in-

wards.

5. Take one knotted end of the cord and pas it round the pulley on the cord tensioning arm, out through the slot in

the right hand side of the casting and back in, round the pulley.

6. Carefully move the pen carriage to the right-hand end of its movement. Push the cord down through the slot in

the right-hand side of the pen carriage, with the knot on the inside of the slot.

7. Take the other end of the cord and pass it round the remaining pulleys as shown in figure 3.3b.

8. Carefully move the pen carriage to the left-hand end of its movement. Ensure that the cord is not tangled round

the guide bar etc. Push the cord down through the slot in the left-hand side of the pen carriage, with the knot on

the inside of the slot.

9. Pull the cord tight by pulling on the loop inside the capstan.

10. Wrap two turns of cord onto the capstan by rotating it two turns clockwise. Rotate the capstan until the hole in its

side is pointing directly at the pulley in the front left corner. Ensure that the cord wraps onto the capstan neatly

without any cross-overs.

11. Thread the cord loop through the ferrule, and, whilst maintaining tension on the cord, slide the ferrule down in-

side the capstan. Ensure that the cord passes correctly round all the pulleys.

12. With the carriage at the right-hand end of its travel, adjust the cord such that the hole in the side of the capstan

points directly at the pulley in the front left corner.

13. With the cord taut, lightly crimp the ferrule as close as possible to the inside wall of the capstan.

14. With the carriage at the right-hand end of its travel, use a 0 to 30 centi-Newton (cN) Correx gauge, midway be-

tween the capstan and the cord tensioning arm pulley, to deflect the cord 2mm. The correct reading should be

between 15 and 20 cN inclusive. If the reading is correct skip step 15.

15. a If the reading is too high, pull some 1mm of the spare loop back through the ferrule towards the outside of the

capstan. Repeat step 14.

b If the reading is too low, use the cord tensioning arm to increase it slightly. Repeat step 14.

16. Once the correct reading has been obtained, crimp the ferrule

tightly.

17. Check that the carriage can move freely to both ends of itsmovement, and that the cord always enters and leaves the

capstan tangentially. Check that the cord does not bear

against the tensioning arm securing screw.

18. Cut off excess cord, leaving approximately 3mm tails.

Use a soldering iron to melt these tails together.

19 Return the pen tray to the recorder and carry out the

dotting head adjustments as described in section 2.3.2.


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3 .3 AN N OTATOR TRAY RE-CORDIN G (Cont.)

RECORDIN G PROCEDURE (Cont.)

Tensioning arm

Figure 3.3b Annotator drive-cord routing


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3 .4 M ODEL 346 PEN TRAY RECORDIN G

Notes:

1 A suitable drive cord kit (LA246123) is available from the manufacturer.

2. Unless otherwise stated, directions (left, right etc.) are given assuming the pen tray arms facing

the operator and the cord capstan upwards (i.e. the motor protrudes under the pen tray).

RE-CORDIN G PROCEDURE1. Follow the disassembly instructions given in section 2.3.3. In addition, remove the screw securing the dotting

head flexi cable to the bulkhead. This allows the pen tray to be fully accessed.

2. Remove the grip ring and associated plastic washer from the capstan, retaining these fixings for later use. Re-

move the capstan and carefully prise out the cord tensioning spring. Care should be taken to retain the second

plastic washer located between the capstan and the pen tray.

3. Remove the cord clamping-screw and associated clamp from the doting head carriage. Remove the old cord,

cutting it if convenient.

Note: the cord clamping screw and its associated locknut are also used to set pen height. It is there-

fore recommended that the nut position on the screw is disturbed as little as possible, to minimise later

adjustment.

4. Clean the pen tray, and ensure that all the pulleys are free to rotate.

5. Set the tensioning arm to its minimum tension position, by releasing its securing screw and rotating the arm fully

clockwise. Re-tighten the screw.

6. Take the cord, and cut it to a length of 50cm.

7. Referring to figure 3.4a, (showing a representation of the underside of the dotting head carriage), pass the two

ends of the cord through the square hole. If necessary, use tweezers or snipe-nosed pliers to help pull the ends

through. Pass the resulting loop round the boss. Taking into account the note above, and checking that the free

ends of the cord are of approximately equal length, re-fit the cord clamp, but tighten the screw only sufficiently to

retain the cord, not to clamp it.

Figure 3.4a underneath of dotting head carriage showing cord tow point

8. Pass the ends of the cords round the front pulleys, and across to the capstan. Thread the ends through the hole in

the side of the capstan, so that they emerge on the inside. Check the routing of the cord to ensure that it will be

able to go round all the pulleys; e.g. it is not wound round the dotting head guide rails or the pen tray side arms.

Boss

Drive cord

Drive cord

Guide rails


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Figure 3.4c Capstan centring and cord arrangement

Cord endsfrom inside

capstan

Capstan spring

Ferrule

Dotting

head

Dottinghead

Equaldistances

3 .4 M ODEL 346 PEN TRAY RECORDIN G (Cont.)


9. Pull the ends of the cord through the capstan and, referring to figure 3.4b, feed both cord ends through one of the

spring end rings, and one only through the other end ring. Using a puller (section 3.2) and a pair of pliers, pull

the cord ends through the ferrule, one at a time. Locate the ferrule such that the cord ends protrude approxi-

mately 2 mm. Crimp the ferrule onto the cord, and melt the ends together using a hot soldering iron.

Figure 3.4b Cord route through tensioning spring

10. Slide the spring towards the ferrule, until it is in contact with it..

11. Place one of the plastic washers, previously removed, over the capstan spindle.

12. Slide the capstan towards the spring, and curl the spring into the centre of the capstan.

13. Wind the right-hand part of the cord a single anti-clockwise (counter clockwise) turn round the capstan, moving

from the hole towards the top.

14. Wind the left-hand part of the cord a single clockwise turn round the capstan, moving from the hole towards the

bottom.

15. Place the capstan over its spindle. Place the remaining plastic washer over the spindle, and secure using the grip

ring previously removed.

16. Route the cord neatly round all the pulleys, including the tensioning arm pulley. Clamp the cord gently.

17. Run the dotting head from one end of travel to the other, ensuring that the cord winds and unwinds neatly at the

capstan, without any crossovers.18. Release the cord clamp sufficiently to allow the dotting head carriage to slide over the cord without damaging it.

19. Slide the dotting head to its right hand mechanical stop. Rotate the capstan clockwise, allowing the cord to slide

past its clamp, until all the left hand cord is unwound, and the capstan hole is facing slightly right of front cen-

tre.

20. Tighten the cord clamp using the screw and nut, and slide the dotting head to its left-hand end of travel. Check

that the hole in the capstan is now pointing slightly left of front centre.

21. If necessary, release the clamp and adjust the position of the dotting head carriage on the cord until the angle at

which the hole in the capstan stops is equal, on opposite sides of centre front (figure 3.4c). Re-tighten the clamp.


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3 .4 M ODEL 346 PEN TRAY RECORDIN G (Cont.)


22. With the carriage at the right-hand end of travel, use a 0 to 30 centi-Newton (cN) Correx gauge to deflect the

cord, at a point half-way between the carriage and the left hand side, until it touches the front guide bar (this is

best done with the pen tray upside-down). The reading should lie between 20 and 25cN inclusive.

23. Adjust the position of the tensioning arm as necessary in order to achieve the correct tension reading, and re-peat step 21.

24. Re-assemble the pen tray components, ensuring adequate static precautions are taken when handling the circuit

board. Ensure that all electrical connections are re-made.

25. Return the pen tray to the recorder and carry out the dotting adjustments described in section 2.3.3.

Tensioning arm

Figure 3.4d Pen tray cording (Model 346)


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SECTION 4 DISPLAY RIBBON REPLACEM EN T

4.1 INTRODUCTION

This section includes a replacement procedure for display ribbons for models 342 and 344. For disassembly instruc-

tions to allow access to the pen trays, please see section 2.

The replacement of the ribbon is a delicate procedure, and it is recommended that the pen tray be stabilised by placing

it on a flat block such that it no longer rests on the base of the motor.

CAUTION

Model 344 pen trays contain electronic devices which are sensitive to static electrical discharge. A

suitable static safe work area (section 1.3) should be made available before any work is started.

The following ribbons are available as spare parts from the manufacturer:

Channel 1 (blue) ...... BT234901

Channel 2 (red) ........ BT234902

Channel 3 (green) .... BT234903

4 .2 RIBBON REM OVAL PROCEDURE

The following procedure assumes that the ribbon is being replaced because it is broken. If this is not the case, follow

only those parts of the procedure which are relevant to non-broken ribbons.

1. With the pen carriage at approximately mid-travel, release the clamp screw (figure 4.2) sufficiently to allow the

clamp ring to be shaken out. Remove the screw completely and retain this and the clamp ring for use in subse-

quent re-assembly.

2. Use the drive cord pulley to move the carriage to the right, meanwhile pulling on the white end of the ribbon*.

This will cause the ribbon adjustment rack to be pulled out of the housing. Care should be taken not to lose this

item.

* If the ribbon is broken in such a way that there is insufficient white ribbon to pull, rotate the ribbon adjustment pin-

ion clockwise to release the rack.

3. With a hand held over the pen carriage, invert the pen tray to allow the ribbon adjustment pinion to fall into the

hand. This item should also be retained for re-assembly

4. Remove all traces of the old ribbon.

5. Using tweezers, insert the clamp ring into the pen carriage such that a) its taper is downwards, and b) it is aligned

with the clamp screw holes (one hole in the top of the pen carriage moulding, one in the bottom. Insert the clamp

screw into the hole in the top of the moulding, through the clamp ring and then tighten it sufficiently to enter the

bottom hole.

6. Re-fit the ribbon adjustment pinion (but not the rack).

Figure 4 .2 Ribbon release

Clamp screw

Clampring

Ribbon adjustmentpinion


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4 .3 RIBBON REPLACEM EN T PROCEDURE

1. Lay the pen tray on a flat block, with the motor overhanging the edge and the pen tray arms facing forwards.

2. Take the ribbon appropriate to the channel and, if necessary, trim the white end so that the distance between the

punched hole and the end of the ribbon is the same as that at the coloured end.

3. Hold the ribbon such that the coloured portion is to the front, and on the left.

4. Bend the white end of the ribbon anti-clockwise (counter clockwise) and with the display door closed, lead it

round the pulley (A in figure 4.3) attached to the ribbon tensioning spring bracket, and back out again. Ensurethat the ribbon passes only round the pulley, not round the tensioning spring as well.

5. Lead this white end of ribbon leftwards across the display door and pass it between the two pulleys (B) at the

hinge.

6. Lead the same end of the ribbon down the left-hand side arm, towards the rear of the tray, and pass it between the

remaining two pulleys C in the left arm. Pull the end through, towards the pen carriage.

7. Take the coloured end of the ribbon and, ensuring there are no twists, pass the ribbon over the top of the display

(not along the front - this is done later), pass the end round the rearmost of the two pulleys C, and lead the end

in towards the pen carriage.

8. Using the drive cord capstan, move the pen carriage to the right-hand end of its travel. Again ensuring that the

ribbon is not twisted, pass the coloured end right across the pen tray, through the pen carriage (behind the clamp

ring and adjustment pinion), round the right hand pinion (D) and back in towards the pen carriage.

9. Pass the ribbon back through the pen carriage (this time in front of the clamp and adjustment pinion), and pull it

towards the white end of the ribbon.

10. Open the display door 20 to 30 degrees.

11. Orient the adjustment rack, such that the teeth are facing away, and are at the bottom right hand corner.

12. Place the punched hole in the white end of the ribbon over the spigot at the near side of the rack.

13. Place the punched hole in the coloured end of the ribbon over the spigot at the near side of the rack.

14. Whilst holding the two ends of the ribbon in place with tweezers, open the display door completely, ensuring that

the ribbon now springs into place, along the front of the display door.

15. Close the door, and check that the ribbon passes correctly round all the relevant pulleys.

Note: This should result in the ribbon being under sufficient tension to hold the rack suspended.

16. Check that the clamp ring is fitted correctly, with the narrower end of the taper towards the bottom of the tray.

17. Rest the tray on its right hand side, and slide the clamp ring towards the head of the clamp screw.

18. Slowly slide the pen carriage towards the rack, and use tweezers to introduce the rack into the pen carriage as it

moves. Continue to move the carriage until the rack is approximately central within the carriage body.

19. Return the pen tray to the horizontal, and tighten the clamp screw sufficiently to cause the clamp ring to grip the

rack. Check to see if the ribbon adjustment pinion can be easily turned. If so tighten the clamp screw further and

check again.

Caution

The over tightening this screw will result in serious damage being caused to the pen carriage.


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4 .3 RIBBON REPLACEM EN T (Cont. )

Figure 4.3 Ribbon routing

4 .4 DISPLAY RIBBON ADJUSTM EN T

The adjustment of the ribbon relative to the scale or pen trace is carried out with the pen tray returned to the recorder

and powered-up.

1. Apply that input signal which should result in a zero* display position. If necessary, release the clamp screw

(figure 4.2) sufficiently to allow the adjustment pinion to be moved, and rotate the adjustment pinion as necessary

to align the colour/white transition of the ribbon to the scale or pen trace as required.

2. Once alignment is satisfactory, gently tighten the clamp screw sufficiently to cause the clamp ring to grip the

rack. Check to see if the ribbon adjustment pinion can be easily turned. If so tighten the clamp screw further and

check again.

Caution

1. The over tightening this screw will result in serious damage being caused to the pen carriage.2. Ensure that the input voltage is not applied or removed when the clamp screw is loose. Failure to

ensure this may result in the pen moving without the ribbon, and the subsequent loss of the adjustment

rack into the recorder chassis.

* The word zero should be interpreted as the leftmost calibration on the chart.

The zero position is used for convenience; any input which produces a known reading on the scale or chart may

be used instead.


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A

AdjustmentAnnotator dotting head .............................................. 8Display ribbon .......................................................... 21

Dotting head force ................................................... 10Pen height

Continuous-trace recorders recorders .................. 8Multi-point recorders ............................................10

D

Display ribbonAdjustment ............................................................... 21Replacement ............................................................19

Dotting forceAdjustment

Continuous-trace recorders ................................... 8Multi-point recorders ............................................10

H

Handling precautions ..................................................... 3

M

Maintenance, preventive ............................................... 5

Index

P

Pen heightAdjustment

Continuous-trace recorders ................................... 8

Multipoint ............................................................. 10Pen tray re-cording

Continuous traceAnnotator pens ....................................................14Channel pens ....................................................... 11

Multipoint recorders ................................................. 16Pen tray removal

Digital displayContinuous trace ................................................... 8Multipoint ............................................................... 9

Ribbon display ........................................................... 6Preventive maintenance ................................................ 5

R

Re-cordingAnnotator pen trays ................................................. 14Channel pen trays

Continuous trace recorders .......................... 11, 16Ribbon replacement ....................................................19

S

Safety notes ................................................................... 2Static handling ...............................................................3

List of effective pages

This (issue four) manual contains the following pages at their specified issue levels:

Page 1 ....................................................... Issue 4 Jly 00

Page 2 ....................................................... Issue 4 Jly 00

Page 3 ....................................................... Issue 4 Jly 00

Page 4 ....................................................... Issue 4 Jly 00

Page 5 ....................................................... Issue 4 Jly 00

Page 6 ....................................................... Issue 4 Jly 00

Page 7 ....................................................... Issue 4 Jly 00

Page 8 ....................................................... Issue 4 Jly 00

Page 9 ....................................................... Issue 4 Jly 00Page 10 ..................................................... Issue 4 Jly 00

Page 11 ..................................................... Issue 4 Jly 00

Page 12 ..................................................... Issue 4 Jly 00

Page 13 ..................................................... Issue 4 Jly 00

Page 14 ..................................................... Issue 4 Jly 00

Page 15 ..................................................... Issue 4 Jly 00

Page 16 ..................................................... Issue 4 Jly 00

Page 17 ..................................................... Issue 4 Jly 00

Page 18 ..................................................... Issue 4 Jly 00

Page 19 ..................................................... Issue 4 Jly 00

Page 20 ..................................................... Issue 4 Jly 00Page 21 ..................................................... Issue 4 Jly 00

Page 22 ..................................................... Issue 4 Jly 00


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GermanyEurotherm Medatentechnik GmbHOttostrae 1,D-65549 Limburg a.d.Lahn

Tel: 49 64 31 9173 0Fax: 49 64 31 9173 33

Great Britain

Eurotherm Recorders Limited,Dominion Way,Worthing,West Sussex BN14 8QL

Telephone: 01 903 205222Telex: 877296 CHESEL G

Fax: 01 903 203767Email: [email protected]

or: [email protected]: http://www.eurotherm.co.uk

Hong KongEurotherm Limited,Unit D, 18/F Gee Chang Hong Centre,65, Wong Chuk Hang Road,

Aberdeen.Telephone: 852 2873 3826

Telex: 69257EIFEL HXFax: 852 2870 0148

IndiaEurotherm Del India Limited,152, Developed Plots Estate,Chennai 600 096,

Telephone: 91 44 4961129Fax: 91 44 4961831

ItalyEurotherm SpA,Via XXIV Maggio,I-22070 Guanzate,Como.

Telephone: 39 031 975111Fax: 39 031 977512

JapanDensei Lambda K.K.,Strategic Products Dept.5F Nissay Aroma Square,37-1, Kamata, 5-Chome,Ohta-ku,Tokyo 144-8721

Telephone: 81 3 5714 0620Fax: 81 3 5714 0621

Web: http://www.densei-lambda.com

Inter-Company sales and service locationsKoreaEurotherm Korea Limited,J- Building402-3Poongnab-Dong,Songpa-KuSeoul, 138-040

Telephone: 82 2 2478 8507

Fax: 82 2 488 8508

NetherlandsEurotherm BV,Genielaan 4,2404CH Alphen aan den Rijn,The Netherlands

Telephone: 31 172 411 752Fax: 31 172 417 260

NorwayEurotherm A/S,Post Boks 650,N - 1411 Kolbotn,Norway,

Telephone: 47 66 803330Fax: 47 66 803331

SpainEurotherm Espaa SA,Pol. Ind. De Alcobendas,Calle de la Granja 74,28108 Alcobendas,Madrid.

Telephone: 34 91 661 60 01Fax: 34 91 661 90 93

SwedenEurotherm AB,Lundavgen 143,S-21224 Malm.

Telephone: 46 40 38 45 00Fax: 46 40 38 45 45

SwitzerlandEurotherm Produkte (Schweiz) AG,Schwerzistrae, 20,CH-8807 Freienbach.

Telephone: 41 55 415 44 00Fax: 41 55 415 44 15

United States of AmericaEurotherm Recorders Inc.One Pheasant Run,Newtown Industrial Commons,Newtown PA 18940.

Telephone: 1 215 968 0660(Toll-free USA/Canada: 1 888 7097 2475)

Fax: 1 215 968 0662Web: http://www.chessell.com

e-mail:[email protected]

Specification subject to change without notice. Eurotherm Limited.

AustraliaEurotherm Pty. Limited.Unit 10.40 Brookhollow Avenue,Baulkham Hills,NSW 2153

Telephone: 61 2 9634 8444

Fax: 61 2 9634 8555Email: [email protected]

or: [email protected]

AustriaEurotherm Me-und Regeltechnik GmbHGeiereckstrae 18/1,A1110 Wien,

Telephone: 43 1 798 76 01Fax: 43 1 798 76 05

Belgium

Eurotherm BV,Herentalsebaan 71-75,B 2100 DeurneAntwerpen

Telephone: 32 3 322 3870Fax: 32 3 321 7363

DenmarkEurotherm Danmark A/SFinsensvej 86,DK 2000 Fredriksberg,

Telephone: 45 38 871622Fax: 45 38 872124

FinlandEurotherm Finland,Auragaten 12A,FIN-20100 bo

Telephone: 358 22 50 60 30/1Fax: 358 22 50 32 01

FranceEurotherm ChessellUne division d'Eurotherm Automation SA,Parc d'affaires,6, Chemin des Joncs,

BP55F - 69572 Dardilly, CEDEX

Telephone: 33 4 78 66 45 00Fax: 33 4 78 35 24 90

EUROTHERM LIMITED

Faraday Close, Durrington, Worthing, West Sussex, BN13 3PLTelephone: 01903 205222. Facsimile: 01903 203767e-mail: [email protected]

Website: http://www.eurotherm.co.uk

EU RO THERM

HA245946/4 (D8577)
http://www.eurotherm.co.uk/http://www.densei-lambda.com/http://www.chessell.com/http://www.eurotherm.co.uk/http://www.eurotherm.co.uk/http://www.chessell.com/http://www.densei-lambda.com/http://www.densei-lambda.com/http://www.eurotherm.co.uk/


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34X Service Manual HA245946 Iss4

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Transcript of 34X Service Manual HA245946 Iss4