Specifications

∗
C0511, C0523
Step Check Item Result Action
1
When the Fusing Unit Front Door is
removed and the copier has completed
warming-up, does the Lower Fusing Roller
Heater Lamp H3 light up?
NO
•
To Step 4.
2
Is TH2 connected securely or clean?
YES
•
Connect TH2 securely or clean
TH2.
3
Disconnect CN25 (4P). Is the resistance
across CN25-2 and -3 on the Fusing Unit
side infinite?
YES
•
Change TH2.
NO
•
Change PWB-A.
4
After the copier has completed warming-up,
is the voltage across PJ7-1A on PWB-A and
GND DC0V? (When H3 is turned ON)
NO
•
Change PWB-A.
5
Disconnect CN6 (6P). Is there continuity
across CN6-4 and -5 on the Fusing Unit
side?
YES
•
Change SSR3.
NO
•
Change H3.
∗
C0523
Step Check Item Result Action
1
After the copier has completed warming up,
does the Lower Fusing Roller Heater Lamp
H3 remain lit up?
NO
•
To Step 3.
2
By changing the H3 ON/OFF signal from the
Master Board, check whether H1 is turned
OFF or not as described below:
 
1) Select "IC Port Data Check".
2) Is the data of P43 on PWB-A (IC1A) "1"?
(See the 1/8 screen on T-7.)
NO
•
Change PWB-A.
3) By pressing the "Change" key to change
the data from "0" to "1", is H3 turned
OFF?
NO
•
Change SSR3.
3
Disconnect CN22 (8P). Is the circuit across
CN22-5 and -6 on the Fusing Unit side
shorted?
YES
•
Change TH3.
NO
•
Change PWB-A.
∗
C0540
Step Check Item Result Action
1
Check the Thermistor Loading signal as
described below:
 
1) Select "IC Port Data Check".
2) Is the data of BPC2 on PWB-A (IC4A)
" "? (See the 2/8 screen on T-7.)
YES
•
Change PWB-A.
NO
•
Check CN22 (8P), CN24 (4P)
and CN25 (4P).
L
T-90