Muratec MFX-2500 Field Engineering Manual page 243

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