41955801TH Rev.8
115 /
Oki Data CONFIDENTIAL
5.5.2
Preparing for troubleshooting
(1)
Operator panel display
Problems that are generated in this device are indicated in the LCD.
Apply proper measures according to the message displayed in the LCD.
Note:
When changing the engine board (K7N/K7V PWB), remove the EEPROM chip from
the old board and install it on the newly replaced board
(2)
CU assembly troubleshooting
No operation
Is an error message displayed?
YES
Perform according to the error message.
▼
•No
Is black displayed in the top and bottom lines of the operator panel LCD?
•No
Check the power voltage
3.3V, 5V
3.3V is open space
2 pin for JTAGW
5V is 2, 3 pins for open space HD5V.
No
Replace the power supply.
▼
•YES Check the PU board and operator panel board.
▼
•YES
Is ROM DIMM A set properly?
No
Set a program DIMM to ROM DIMM A properly.
If the error is not recovered, replace the CU board.
▼
•YES
Replace the CU board.
Remove EEPROM from the old board and install it on the new board.
No.
1
2
3
4
5
6
Problem
The printer does not function properly after power ON.
Jam error
Feed jam (1st tray)
Feed jam (multipurpose tray)
Path jam
Exit jam
Duplex jam
Paper size error
I/D up/down error
Fuser unit error
Fan motor error
Flow Chart No.
1
2
-1
2
-2
2
-3
2
-4
2
-5
3
4
5
6
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...