Troubleshooting - Epson Perfection 1200U Service Manual

EPSON Perfection1200

3.3 Troubleshooting

This section describes troubleshooting from the abnormal phenomenon. You
can isolate the faulty unit based on the abnormal phenomenon. See the table
below to find the closest phenomenon and the corresponding table to refer to.
Table 3-2. Abnormal Phenomenon and corresponding Tables
Phenomenon
Scanner does not • Operate Light on the control panel
operate even its power is does not come On.
On.
• Scanner does not operate the
initialization.
Fatal Error occurs and is • Carriage Unit does not operate.
not cleared after turning
• Carriage Unit crashes into the front or
off and back on the
rear frame and then the error is
scanner.
indicated.
• The lamp does not light up.
Scanned image is Scanned image is unclear.
unclear.
"Interface Error" is • SCSI Interface Error
indicated.
• USB Interface Error
"Option Error" occurs. • Optional unit does not operate
correctly.
Optional unit (ADF/TPU)
does not operate.
Troubleshooting
Description Ref, Table
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
3-11
Table 3-3. Panel LED does not turn On.
Cause
Connector CN1 on
the power board is
disconnected.
Connector CN101 or
CN102 on the power
board disconnected.
Fuse on the power
board has blown out.
The power board.is
broken.
Connector CN6 (*1)
on the power board
is disconnected.
The control board is
broken.
NOTE: *1: This connector number is for SCSI. The connector number for
USB is CN3.
Table 3-4. Scanner is not initialized
Cause
Connector CN1 on
the power board is
disconnected.
Troubleshooting
Step Checkpoint Finding
1 Is the connector Yes
CN1 on the power
board
disconnected?
2 Is the connector Yes
CN101 or CN102
on the power board
disconnected?
3 Has the fuse on the Yes
power board blown
out?
4 With the scanner No
On, check the
voltage output level
between pins 8/
9(+) and pins 6/7(-)
on the power
board. Is the
voltage +5VDC?
5 Is the connector Yes
CN6 (*1) on the
control board
disconnected?
6 --- ---
Step Checkpoint Finding
1 Is the connector Yes
CN1 on the power
board
disconnected?
Revision B
Solution
Connect CN1
properly.
Connect CN101 or
102 properly.
Replace the fuse.
Replace the power
board.
Connect CN6 (*1)
properly.
Replace the control
board.
Solution
Connect CN1
properly.
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