Specifications

4-29
18, 19
Step Check Item Result Action
1
Does H1 turn ON after the malfunction
is reset?
YES
Check TH1 for contamination or
installation.
2
Is there continuity across CN3-1 and 2
on the Fusing Unit end with CN3 (2P)
disconnected?
NO Check H1, TS1, and TF1 for continuity.
3
Is there continuity across 1A and 1B,
and across 2A and 2B, of S3 when S3
is turned ON?
NO Change S3.
4
Is the resistance of TH1 (across CN5-
2 and 3 on the Fusing Unit end)
infinity?
YES Change TH1.
YES Change PU1 or PWB-A.
5 Is Fuse F2 on PU1 conducting?
NO Change the fuse.
1A
Step Check Item Result Action
1 Is TH1 installed properly? NO Install TH1 correctly.
2 Is TH1 dirty? YES Clean or change TH1.
YES Change TH1.
3
Is the circuit across CN5-2 and 3 on
the Fusing Unit end closed when CN5
(4P) is disconnected?
NO Change PWB-A or PU1.