41955801TH Rev.8
127 /
Oki Data CONFIDENTIAL
1
An image is generally faint or the color is irregular. (Fig 5-2 A )
•
Is the amount of toner low? (Is [Toner Low] indicated?)
Yes
Refill toner.
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•
No
Is regulated paper used?
No
Use regulated paper.
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•
Yes
Is the LED head lens dirty?
Yes Clean the LED head lens.
▼
•
No
Are all items of the LED head assembly connected properly to the connection board (Y73
PWB) and engine board (K7N/K7V PWB)?
No
Check the cable connection (between each LED head and engine board), then connect the
cables between the LED head and engine board properly.
▼
•
Yes
Is +5V output to the following power 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/K7V PWB)?
+34V: Pin 12, 13, 14
No
Check the cable connections, then replace the low-voltage power unit.
▼
•
Yes
Is 34V output to the HVOLT connector pin 2 on the engine board (K7N/K7V 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.
Yes End.
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•
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.
▼
•
Yes
Replace the image drum.
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.
Summary of Contents for C7500n
Page 14: ...41955801TH Rev 8 14 Oki Data CONFIDENTIAL 2 2 Parts layout Figure 2 1 A A B B A A B...
Page 15: ...41955801TH Rev 8 15 Oki Data CONFIDENTIAL Top Cover Assy Figure 2 2 For 1200dpi For 600dpi...
Page 16: ...41955801TH Rev 8 16 Oki Data CONFIDENTIAL Printer Unit 1 2 Figure 2 3 A A...
Page 17: ...41955801TH Rev 8 17 Oki Data CONFIDENTIAL Printer Unit 2 2 Figure 2 4...
Page 18: ...41955801TH Rev 8 18 Oki Data CONFIDENTIAL Cassette Guide Assy L R Figure 2 5 A B B A C C C C...
Page 19: ...41955801TH Rev 8 19 Oki Data CONFIDENTIAL Duplex Unit A B D C A B C D E E F G G F Figure 2 6...
Page 84: ...41955801TH Rev 8 84 Oki Data CONFIDENTIAL Pattern 5 Pattern 6 Pattern 7...
Page 177: ...41955801TL Rev 8 4 Oki Data CONFIDENTIAL 49 35 50 44 51 50 43 46 47 48 36 Main Assembly 3 3...
Page 191: ...41955801TL Rev 8 10 10 Oki Data CONFIDENTIAL 2nd 3rd Tray 1 2 3 4 8 5 6 7...
