DT2 Service Guide Pg263-277

7/25/2019 DT2 Service Guide Pg263-277

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Chapter 5. Replacement Procedures

Electronics Drawer

Service Guide 5 - 41

8, 1 Heaters test

close_heat_relay signal and K2

close_vac_relay signal and K1.

4. Close the electronics drawer, and slide in the cabinet stabilizer.

S2 Computer

Required Tools and Supplies

Phillips screwdriver Slotted screwdriver.

Time RequiredApproximately 30 minutes.

S2 Computer Removal

1. Shutdown the printhead, quit the fluid controller software, and turn

off the print station.

2. Pull out the cabinet stabilizer, and open the electronics drawer.

3. Remove the computer mounting screws from the outside of thedrawer.

4. Pull the computer from the front of the drawer, and then tilt the

connector end of the computer up to provide access to the cables.

5. Disconnect the following cables from the rear of the computer(Figure 5.27).

J10

D

J1

J2

J3

A

C

J4

J5 (Older computers may have a security key attached here.)

J6.

6. If necessary, disconnect any cables from the fluid controller board.


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5 - 42 Scitex S2 Print Station

Figure 5.27 S2 computer, electronics drawer

7. Pull the computer out of the drawer.

S2 Computer Installation

1. Attach the software key in the replacement computers J5.

2. Place the replacement computer in the front of the drawer, and thentilt the connector end of the computer up to provide access to thecables.

3. Connect the following cables to the rear of the computer (Figure5.27).

J6

J5 (Older computers may have a security key attached here.)

J4

C

A

J3

J2

J10D

J1J2

J3

J4

C

J5

A

J6

Mounting screws


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J1

D

J10.

4. Install the computer mounting screws from the outside of the drawer.

5. Connect any cables that were disconnected from the fluid controllerboard.

6. Start the print station, and watch the displayed diagnostic messages asthe computer starts.

Note: Computers are normally shipped with DOS installed. If DOS is notinstalled, or if the diagnostic messages are not as indicated in themanufacturers documents, use the manufacturers documents to installDOS.

7. Install the fluid controller software as described in Installing theFluid Controller Software on page 6 - 1.


S2 Pentium Computer


Phillips screwdriver Slotted screwdriver.


S2 Computer Removal

1. Shutdown the printhead, quit the fluid controller software, and turnoff the print station.


3. Remove the computer mounting screws from the outside of thedrawer.

4. Pull the computer from the front of the drawer, and then tilt theconnector end of the computer up to provide access to the cables.

5. Disconnect the following cables from the rear of the computer(Figure 5.27).

J5

B

A

J4

J10

C


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Electronics Drawer


J3 - COM1

J6 - CRT

J1 - KBD.

6. If necessary, disconnect any cables from the fluid controller board.

Figure 5.28 S2 Pentium computer, electronics drawer

7. Pull the computer out of the drawer.

S2 Computer Installation

1. Check the installed jumpers on the CPU board, using Table 4.26 orTable 4.25 (board layout Figure 4.45 or Figure 4.46).

2. Attach the software key in the replacement computers J5.

3. Place the replacement computer in the front of the drawer, and thentilt the connector end of the computer up to provide access to thecables.

4. Connect the following cables to the rear of the computer (Figure5.27).

J1 - KBD

J6 - CRT

Mounting screws

J5

BA

J4

J10

C

J6 - CRT

J1 - KBD

J3 - COM1


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Electronics Drawer


J3 - COM1

C

J10

J4

A B

J5.

5. Install the computer mounting screws from the outside of the drawer.

6. Connect any cables that were disconnected from the fluid controllerboard.


Note: Computers are normally shipped with DOS installed. If DOS is not

installed, or if the diagnostic messages are not as indicated in themanufacturers documents, use the manufacturers documents to installDOS.

8. Install the fluid controller software as described in Installing theFluid Controller Software on page 6 - 1.


Analog Input Board


Phillips screwdriver

Slotted screwdriver Grounding mat Grounding strap.


Caution: When moving or storing acircuit board, insert it in an anti-static bag thatshields the board fromelectrostatic damage. Any circuit board can bedamaged by discharges of static electricity. Damage may not beimmediately apparent until the print station uses that portion of thedamaged circuit board. Styrofoam cups and other materials that can easilyaccumulate static charges should be kept away from the work area.

Caution: Ground yourself by using agrounding strap and by working on a static-tested, grounded pad.

Caution: Handlecircuit boards only by the edges that do not have connectors. Donot touch the edge connectors of circuit boards, because body oils and dirtcan cause incomplete seating or inadequate connections. You can use theeraser on a lead pencil for cleaning, but be sure to remove all debris fromthe erasure.


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Electronics Drawer


Analog Input Board Removal

Note: Leave the new circuit board in its packaging until you can place it into thechassis position.


Caution: Circuit boards can be damaged by static electricity; even amounts of staticthat you cannot feel can damage the board.

2. Place a grounding mat on any floor area that you may use whilecarrying an unpackaged circuit board.

3. Attach a grounding strap to your wrist.


5. Remove the S2 computer, using Step 3 through Step 7 in S2Computer Removal on page 5 - 41.

6. Open the computer with the following steps:

a. Loosen, but do not remove, the hinge screws (Figure 5.31).b. Remove screws from the top and two sides.

c. Swing up the cover.

Figure 5.29 Internal access, S2 computer

7. Remove the analog input board with the following steps.

a. Remove the retainer screw.

b. Slide the board out of its slot (Figure 5.32).

Hinge screws

Computer front


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Figure 5.30 Board location, analog input board

8. Remove the new board from its box, remove the bubble wrapping,and open the antistatic bag.

9. Place the old board in the antistatic bag, wrap the bagged circuitboard with the bubble wrapping, and place the wrapped circuit boardin its box.

Analog Input Board Installation

1. Check the installed jumpers and switches on the new board, usingTable 4.21 and Table 4.22 (board layout, Figure 4.43).

2. Attach the new board to the chassis into the empty slot.

3. Close the computer with the following steps:

a. Swing down the cover.

b. Attach screws at the top and two sides.

c. Tighten the hinge screws at each top corner (Figure 5.31).

4. Install the S2 computer, using Step 2 through Step 5 in S2 ComputerInstallation on page 5 - 42.


6. Enter diagnostics, and check the operation of the board with thefollowing selections:

2 Vacuum/fill test

Signals: vac_transducer signal.

4 Ink/stim test

Signals: press_drive, press_transducer, stim_ampl, stim_clock,stim_out, and stim_tab signals.

6 A/D tests

Analog input board


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Electronics Drawer


Signals: air_temp, con_temp, from_r_cell, heat_block_temp,ink_temp, press_transducer, stim_out, stim_tab, to_r_cell, andvac_transducer signals.

7 Concentration test

Signals: con_temp signal.

8, 1 Heaters testSignals: heat_block_temp and ink_temp signals (both indirectly).

8, 2 Chg. short test

Signals: c_v_status, c_v_ampl.

Caution: To avoid damaging the printhead, unplug J1 before starting the chargevoltage test. The charge voltage must be within 5% of the selectedvoltage.



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Electronics Drawer


Parallel Digital Board (A or D)


Phillips screwdriver Slotted screwdriver

Grounding mat Grounding strap.



Caution: Ground yourself by using agrounding strap and by working on a static-

tested, grounded pad.Caution: Handlecircuit boards only by the edges that do not have connectors. Do

not touch the edge connectors of circuit boards, because body oils and dirtcan cause incomplete seating or inadequate connections. You can use theeraser on a lead pencil for cleaning, but be sure to remove all debris fromthe erasure.

Parallel Digital Board Removal


1. Shutdown the printhead, quit the fluid controller software, and turn

off the print station.Caution: Circuit boards can be damaged by static electricity; even amounts of static

that you cannot feel can damage the board.






a. Loosen, but do not remove, the hinge screws (Figure 5.31).

b. Remove screws from the top and two sides.

c. Swing up the cover.


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Electronics Drawer


Figure 5.31 Internal access, S2 computer

7. Remove the parallel digital board with the following steps.a. Remove the retainer screw.

b. Slide the board out of its slot (Figure 5.32).

Figure 5.32 Board location, parallel digital input boards



Hinge screws

Computer front

Retainer screw

Parallel digital board D

Retainer screw

Parallel digital board A


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Electronics Drawer


Parallel Digital Board Installation


2. Attach the new board to the chassis.

Board A fits into slot J1.

Board D fits into slot J2. Board D is installed upside down, andinto the opposite side from the marking of J2.






5. Start the print station, and watch the displayed diagnostic messages as

the computer starts.


Parallel digital board A carries the following output signals:charge plate heater, solenoid controls, motor drivers, and chargevoltage amplitude.

1 Solenoids test

Signals: close_catcher, open_air_inlet, open_catchpan,open_eyelid, open_ink_supply, and open_replen_supply.

2 Vacuum/fill test

Signals: vac_clock, vac_direction, and vac_enable.

4 Ink/stim test

Signals: press_direction, press_drive, and press_enable.

8, 3 Chg. volt. test

Signal: c_v_ampl.


Parallel digital board D carries the following output and inputsignals: phase bits, stim amplitude bits, charge short, vacuum

relay, and pressure enable.2 Vacuum/fill test

Signals: close_vac_relay.

3 Switch test

Signals: ink_high, ink_low, ink_empty, and overflow signals.

4 Ink/stim test

Signals: stim_ampl, phase_setting, and phase_ref.


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Electronics Drawer


8, 1 Heaters test

Signals: close_heat_relay and close_vac_relay.


Signals: c_v_on and charge_short.


Signals: c_v_on, and charge_short.



Analog and Digital Board


Phillips screwdriver

Slotted screwdriver Grounding mat Grounding strap.



Caution: Ground yourself by using agrounding strap and by working on a static-tested, grounded pad.

Caution: Handlecircuit boards only by the edges that do not have connectors. Donot touch the edge connectors of circuit boards, because body oils and dirtcan cause incomplete seating or inadequate connections. You can use theeraser on a lead pencil for cleaning, but be sure to remove all debris fromthe erasure.

Analog and Digital Board Removal



Caution: Circuit boards can be damaged by static electricity; even amounts of staticthat you cannot feel can damage the board.





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Electronics Drawer




a. Remove screws from the top and two sides (Figure 5.31).

b. Slide off the cover.

Figure 5.33 Internal access, S2 Pentium computer

7. Remove the analog and digital board with the following steps:

a. Disconnect the cables at the board connectors marked Digital Aand Digital B.

b. Remove the retainer screw.

c. Slide the board out of its slot.

Screws

Screws

Screws


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Electronics Drawer


Figure 5.34 Board location, analog and digital board



Analog and Digital Board Installation


2. Attach the new board to the chassis, into its slot.

3. Connect the cables to the board connectors marked Digital A andDigital B.








Analog and digital board A carries the following output signals:charge plate heater, solenoid controls, motor drivers, and chargevoltage amplitude.

Cable to connector A

Analog and digital board

Cable to connector B

(shown without CPU board)


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Service Guide 5 55

1 Solenoids test

Signals: close_catcher, open_air_inlet, open_catchpan,open_eyelid, open_ink_supply, and open_replen_supply.

2 Vacuum/fill test

Signals: close_vac_relay, vac_clock, vac_direction, and

vac_enable.3 Switch test

Signals: ink_high, ink_low, ink_empty, and overflow signals.

4 Ink/stim test

Signals: stim_ampl, phase_setting, phase_ref, press_direction,press_drive, and press_enable.

8, 1 Heaters test

Signals: close_heat_relay and close_vac_relay.


Signals: c_v_on and charge_short.


Signal: c_v_ampl.



Security Key

A registered security key is required for the print station to operate. In

older print stations, it may be attached to J5 on the back of the S2computer (Figure 5.27). In print stations with MOD 14, it is attached at aconnector on the front of the electronics drawer (Figure 5.26).

Varistor


Phillips screwdriver Nut driver, 11/32-inch.


Varistor Removal



3. Disconnect the AC lines from the varistor.

4. Remove the screws that hold the varistor in place.

DT2 Service Guide Pg263-277

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