Minolta Di620, Manual, Page: 271 / 466

T-56
◆
C0500, C0510
Step Check Item Result Action
1 Remove the Fusing Unit Front Cover and
then turn ON the Power Switch. Does H1
turn ON at this time? NO Check step 7 and onward.
2 Does H2 turn ON when the malfunction is
reset with the surface temperature of the
Lower Fusing Roller at 135°C as indicated
on "Level History" available from the Tech.
Rep. mode? NO Check step 8 and onward.
3 Is TH1 or TH2 installed properly? NO Correct the installation of TH1 or TH2.
4 Is TH1 or TH2 dirty? YES Clean or change TH1 or TH2.
5 Measure the resistance of TH1 (across
CN28-2 and 3 on the Fusing Unit end). Is
the measurement infinity? YES Change TH1.
6 Measure the resistance of TH2 (across
CN32-2 and 3 on the Fusing Unit end). Is
the measurement infinity? YES Change TH2.
7 Does the voltage across PJ8A-3B on PWB-
A and GND change from DC5V to DC0V
when the Power Switch is turned ON? NO Change PWB-A.
8 Does the voltage across PJ8A-4B on PWB-
A and GND change from DC5V to DC0V
when step 2 is performed again? NO Change PWB-A.
9 Unplug CN4 (8P). Is there continuity
across CN4-1 and 4 on the Fusing Unit
end? NO Check H1 or TF1 for continuity.
10 Unplug CN4 (8P). Is there continuity
across CN4-5 and 8 on the Fusing Unit
end? NO Check H2 or TF2 for continuity.
11 Is the voltage across PJ4C-3A on PWB-C
and GND, and across PJ4C-2A on PWB-C
and GND, DC5V? YES Change PWB-A, SSR1 or SSR2.
NO Cange PWB-C.