Epson Perfection 4870 Photo Service Manual page 35

Perfection 4870 Photo
Start
Has the
Release the TPU
TPU Carriage Lock
Carriage Lock.
been released?
Is the TPU Lower
Install it normally.
Housing installed
correctly?
Is the
Connector
Connect the
CN2 on the TPU
Connector.
Main Board
connected?
Is the
TPU Carriage
Moving Mechanism
operate normally?
without
problem?
Replace the TPU Re-disassemble and
Main Board. re-assemble.
Figure 3-7. The TPU Carriage Unit does not operate.
TROUBLESHOOTING
Can the
Replace the TPU
TPU CR Motor
CR Motor.
Replace the
corresponding part.
Start
Is the
TPU Harness
connected to the TPU
Main Board and TPU
Carriage?
Is the
Connector CN2
connected to the
TPU Main
Board?
Are the
Connector
CN4 on the TPU
Inverter Board
connected?
Are the
Fluorescent
Lamps set on the
TPU Inverter Board
securely?
Replace the TPU
Main Board.
Figure 3-8. The Fluorescent Lamps of the TPU do not light up.
Troubleshooting
Revision A
Connect the TPU
Harness.
Connect the
Connector.
Connect the
Connector.
Re-set them on the
TPU Inverter Board.
35