Service manual

QMS 3260/4032 Laser Printer - Base Engine Technical Manual 10-145
Release Version 11-97
Removal and Replacement Procedures
RRP 9.7 MCU PWB (PL11.2)
Removal
1. If
y
ou are able to access Dia
g
nostics Mode, then enter Dia
g
nostic Routines 30-5 throu
g
h 30-10 to read
the print en
g
ine usa
g
e lo
g
s. Write down the print count for each cate
g
or
y
.
(
Refer to
Section 8 - Run-
ning Printer Diagnostics
)
.
2. Remove the Rear Cover Assembl
y
(
RRP 1.3
)
.
3. Disconnect the seventeen P/Js that are connected to the MCU PWB.
4. Remove the four screws securin
g
the MCU Bracket to the printer frame, and remove the Bracket and
the attached MCU PWB.
5. Remove the six screws securin
g
the MCU Cover to the MCU Bracket, and remove the Cover.
Wear an electrostatic wrist strap and use caution when working with the MCU PWB. Static
electricity can damage the sensitive electronics of the MCU.
Handle the MCU PWB by the edges of the PWB or by the plastic connectors mounted on
the board. Never touch any of the ICs that are mounted on the PWB.
6. Place the Bracket and MCU on a flat, non-conductive surface.
7. Remove the four screws securin
g
the MCU PWB to the MCU Bracket.
8. Hold on to one of the plastic connectors mounted on the PWB, and lift the MCU off of the Bracket.
Replacement
1. Place the Bracket on a flat, non-conductive surface.
2. Hold on to the ed
g
es of the PWB or one of the plastic connectors mounted on the board, and reinstall
the MCU into the Bracket.
Position the MCU so the connectors are on the ri
g
ht.
3. Use four screws, one in each corner, to secure the MCU PWB to the Bracket.
Do not overtighten these four screws. Overtightening may crack the PWB.
4. Reinstall the MCU Cover onto the MCU Bracket.
Position the Cover so the three screw tabs are on the ri
g
ht and ali
g
ned over the three screw holes in
the center of the MCU PWB.
5. Use six screws to secure the MCU Cover to the MCU Bracket.
6. Reinstall the MCU PWB Bracket onto the printer frame.
Make sure
y
ou do not trap an
y
wire harnesses between the Bracket and the frame.
7. Use four screws to secure the Bracket to the printer frame.
8. Reconnect the seventeen P/Js to the MCU PWB.
9. Reinstall the Rear Cover Assembl
y
(
RRP 1.3
)
.
10. Enter Dia
g
nostic Routines 30-5 throu
g
h 30-10 and take the values
y
ou took from the old MCU usa
g
e
lo
g
s and write them to the new MCU usa
g
e lo
g
s.
(
Refer to
Section 8 - Running Printer Diagnostics
)
.