Ricoh Aficio Color 3006 Service Manual page 461

24 February 1999
SC
Item Detection Conditions
No.
SC558 Zero cross - Timing & Condition -
signal
Zero cross signals generated
abnormal
within a certain period do not
reach a predetermined
number.
SC601 Scanner IPU - Timing & Condition -
communica-
After the main control board
tion error
communicates successfully
with the scanner IPU board
once, a communication error
is detected.
SC604 IDU - Timing & Condition -
communica-
No response is received from
tion error
the IDU within 200 ms after
the scanner IPU board sends
a command and this error is
detected 3 times in total.
Related
Possible Causes
SCs
• Poor connection of
connectors
• Blown fuse
• Defective PSU
• Defective main
control board
• Defective I/O
control board
• Poor connection of
connectors
• Defective scanner
IPU board
• Defective main
control board
• Poor connection
between the IDU
and scanner IPU
board
• Defective IDU
board
• Defective scanner
IPU board
25
Troubleshooting Procedure
1. Check if the following connectors are properly
connected;
•
CN205 and CN218 on the I/O control board
•
CN303 on the main control board
•
CN106 on the PSU
2. Check the continuity of the signal lines of the above
cables.
3. Replace the PSU, I/O control board, or main control
board by checking the signal line at each pin.
- Signals to Check -
• Zero cross: CN106-3 on PSU/ CN205-A6, TP250, or
CN218-B8 on I/O control board / CN303-B4 or TP170
on main control board
1. Turn the main power switch off/on.
2. Check if the connectors (CN412 and CN407) are
properly connected on the sub control board and
scanner IPU board.
3. Replace the scanner IPU board.
4. Replace the main control board.
1. Check if the IDU board is properly connected to the
scanner IPU board.
2. Replace the IDU board.
3. Replace the scanner IPU board.
SC CODES
Type
A
D
D