Rep 1.5 Mcu Pwb - Xerox Phaser 790 Service Manual

REP 1.5 MCU PWB

Parts List on PL 11.2
Removal
To avoid personal injury or shock, do not perform repair activities with the power switch
on or electrical power applied to the machine.
Before replacing the MCU PWB, record the machine values and then reload these values after
replacement, if required.
1. If possible, record the values stored in the machine history (GP 3) and (GP 11).
2. Switch off the machine power and disconnect the machine Power Cord.
3. Remove the Top Cover Assembly (REP 14.4).
4. Remove the Right Cover (REP 14.9).
5. Remove the ESS PWB and Plate as a unit (REP 1.9) (figure 1 of the procedure only).
6. Remove the Controller Chassis (REP 1.11).
Observe the ESD Procedures when removing the MCU PWB.
7. Remove the MCU PWB (Figure 1).
Replacement
For proper machine operation, order and install a new MCU PWB from distribution.
Remove the EPROM at location U2 from the original MCU PWB, and install it on the new
MCU PWB. If a new MCU PWB is not available and you must use a PWB removed from
another machine, you must remove the EPROM from the original MCU PWB and install it on
the replacement MCU PWB. Perform GP6 if performance cannot be restored.
1. Reinstall the MCU PWB in the reverse order of removal.
2. If both MCU PWB and EPROM were replaced with new parts, perform GP5 METER
COPY S TO M to restore the meter information to the new MCU PWB.
3. Check / adjust the fuser temperature setpoint.
A. Adjust the first address in each line following GP 4.
Location Corrected Value
0047 5C XX XX XX
004D 5C XX XX XX
0046 60 XX XX XX
004C 60 XX XX XX
XX
4. Check / Adjust the IOT Registration (ADJ 8.1).
5. Perform VisualCal (GP16).
Initial Issue
Phaser 790/DocuColor 2006
WARNING
CAUTION
CAUTION
CAUTION
3
Remove the
MCU PWB
Figure 1 Removing the MCU PWB
10/00
4-7
2
Remove the four
screws
1
Disconnect the 12
connectors
Repairs and Adjustments
REP 1.5