Section 7: Replacement Procedures
CG4 Series Service Manual Page 7-7
7.5 MAIN CIRCUIT BOARD REPLACEMENT
The main circuit board is the primary brain-center for all printer activities. Circuit boards generally have long
lives due to the lack of moving parts. So if a circuit board becomes defective, it is usually due to a negative
external condition. If it is determined that the circuit board has become defective, search the printer over for
possible visual factors that may have led to the damage.
1. Remove the Bottom Housing Cover as explained in the
earlier
Section 7.3 Removal of the Bottom Housing cover.
2. Press to release the catch of the Power cable connector
and disconnect the connector from the
MAIN Printed Circuit
Board (PCB)
as shown.
3. Remove the Interface Panel from the rear of the printer.
4. Disconnect connectors MOTOR Cable Assy, SENSOR
Cable Assy
, HEAD Cable Assy and Operator Panel (KB)
Cable Assy
on the MAIN Printed Circuit Board (PCB).
5. Remove two screws (circled) securing the MAIN Printed
Circuit Board (PCB)
to the printer chassis as shown.
6. The MAIN PCB can now be removed and replaced.
7. Reconnect all the cables disconnected previously to the
replacement board and arrange all the wiring to avoid from
being pinched.
8. Secure the replacement board with two screws and follow
the above step 1 to 4 in reverse sequence, to reassemble
the parts.
Note:
Arrange the sensor cable through on the inner side of boss
as shown.
9. After the MAIN PCB is certified to be in working condition,
perform All Clear function (refer to
Section 4.12 Factory
Clear Mode
), and Sensor adjustment (refer to Section 4.13
Factory Adjustment Mode
).
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