Oki C7500n Maintenance Manual page 129

3
White page (Fig 5-2 C )
• Is the LED head assembly connected properly to the connection board (Y73 PWB) or engine board
(K7N/K7V PWB)?
NO Connect the cables, connect the LED assembly to the connection board (Y73 PWB), and
engine board properly.
M •
YES Is +5V output to the following power connector pins on the connection board (Y73 PWB)?
+3.8V: Pin 1, 2, 3, 4, 5, 6
• YES Is +5V output to the following cable connector pins between the connection board (Y73
PWB) and LED head assembly?
3 pin for YPOW connector : LED head assembly - yellow
3 pin for MPOW connector : LED head assembly - magenta
3 pin for CPOW connector : LED head assembly - cyan
3 pin for KPOW connector : LED head assembly - black
NO Replace the connection board (Y73 PWB).
M
• YES Check the cable connections, then replace the LED head assembly.
M
• NO Is 34V output to the power connector on the engine board (K7N/K7V PWB)?
+34V: Pin 12, 13, 14
NO Check the cable connections, then replace the low-voltage power unit.
M •
YES Is 34V output to HVOLT connector pin 2 on the engine board (K7N/K7V PWB)?
NO Replace the engine board.
M •
NO Check the cable connections, then replace the high-voltage power unit or belt cassette
assembly. Did the printer recover?
YES End.
M
• NO Is the I/D unit terminal connected properly to the contact assembly. (See Fig. 5-2)
NO Connect the I/D unit terminal properly to the contact assembly.
M •
YES Replace the image drum unit.
Note: 1. Remove EEPROM from the old board and set it on the new board upon replacing the
engine board (K7N PWB).
2. If EEPROM is not replaced, refer to section 3.2.2.
3. When replacing the engine board (K7V PWB), upload EEPROM data from the board and
then download it to a new board, using a life counter tool.
41955801TH Rev.8
Oki Data CONFIDENTIAL
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