Other Abnormal Service Call - Toshiba DP1600 Service Handbook

4.1.15 Other abnormal service call

C91 SRAM abnormality
1. Turn the main switch OFF. Perform the RAM clear ([1] [3] [*] + ON).
2. If C91 appears again after the RAM clear, go to step 3.
3. Confirm that the J1 short pin on the main PWA is inserted properly into the pin 1 side.
4. When the power is off, check that the voltage of the lithium battery (SY1) is 2.4V or more.
5. When the power is off, check that the SRAM backup voltage is 2.0V or more.
(Between IC58 or pin 14 (GND) of IC74 and pin 28 (+5VB))
6. Replace the lithium battery (SY1).
7. Replace the main PWA.
C95 Power supply unit fan motor abnormality
1. Check if each connector between the power supply unit fan motor and the relay PWA (CN50)
is disconnected.
2. Check if each connector between the relay PWA (CN21) and the main PWA (CN15) is dis-
connected.
3. Check if each connector pin is removed or the harness is broken.
4. Check if any conductor pattern on the relay and main PWA is open- or short-circuited.
5. Replace the power supply unit fan motor.
6. Replace the relay PWA.
7. Replace the main PWA.
C96 Process unit fan motor abnormality
1. Check if each connector between the process unit fan motor and the relay PWA (CN50) is
disconnected.
2. Check if each connector between the relay PWA (CN21) and the main PWA (CN15) is dis-
connected.
3. Check if each connector pin is removed or the harness is broken.
4. Check if any conductor pattern on the relay and main PWA is open- or short-circuited.
5. Replace the process unit fan motor.
6. Replace the relay PWA.
7. Replace the main PWA.
1600/2000/2500 TROUBLESHOOTING 4 - 48
02/01
December 2000 © TOSHIBA TEC