Oki C9500 - Page 134

41956001TH Rev.6 134 /
Oki Data CONFIDENTIAL
0 Color irregularity compared with the original
• Is the LED head lens dirty?
YES Clean the LED head lens.
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• NO Is the LED head assembly connected to the connection board (Y73 PWB) properly?
NO Check the cable between the LED assembly and connection board and connect properly.
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• YES Is +5V output to the following HEADPOW connector pins on the connection board (Y73
PWB)?
+5V: Pin 1, 2, 3, 4, 5, 6
• YES Is +5V output to the each LED head assemblies on the connection board (Y73 PWB)?
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).
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• YES Check the cable connections, then replace the LED head assembly.
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• NO Check the cable connections, then replace the low-voltage power unit. Did the printer
recover?
YES End.
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• NO Is 34V output to the power connector on the engine board (K7N PWB)?
+34V: Pin 12, 13, 14
NO Check the cable connections, then replace the low-voltage power unit.
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• YES Is 34V output to HVOLT connector pin 2 on the engine board (K7N PWB)?
NO Replace the engine board.
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• YES Check the cable connections, then replace the high-voltage power unit or belt cassette
assembly. Did the printer recover?
YES End.
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• NO Is the I/D unit terminal connected properly to the contact assembly. (See Fig. 5-3)
NO Connect the I/D unit terminal properly to the contact assembly.
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• 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.