Communications System Service Call - Toshiba DP1600 Service Handbook

C43 Thermistor abnormal
C44 Heater disconnection
1 - 3 is the same check as for the C41.
With 4, the displayed status counter for the C43 is [4] or [6], and the displayed status counter for
the C44 is [5], [7], or [9] so change these displayed status counters to [0] using the same
procedure as for C41.
C45 Thermistor 2 abnormality
1. Check the thermistor 2
(1) Is the connector between the heater thermistor 2 and the relay PWA (CN44) disconnected?
(2) Is the harness of the heater thermistor 2 broken?
(3) Is the connector pin removed?
(4) Does the heater thermistor 2 connect to the heat roller firmly?
2. Check the relay PWA
(1) Is the connector CN44 disconnected?
(2) Is the connector pin removed?
(3) Is there a circuit abnormality, such as open or short circuit?
(4) Replace the relay PWA.
3. Reset the status counter
Change the status counter from 8 to 0 using the same procedure as for C41.

4.1.13 Communications system service call

C56 Communications error between the PFC and the CPU on the main PWA
1. Check if the connector CN36 or CN35 on the relay PWA is disconnected.
2. Check if any conductor pattern (PFRXD, PFREQ, PFACK, MACK/PF, PFTXD, or MREQ/PF
between the IC, IC2 and CN36) on the relay PWA is open- or short-circuited.
3. Replace the relay PWA.
4. Replace the PFC PWA.
5. Replace the main PWA.
1600/2000/2500 TROUBLESHOOTING 4 - 42 December 2000 © TOSHIBA TEC