Canon QY8-1360-000 Service Manual page 152

Part 5: Maintenance
5. Printer
Temperature Error
Beeper: 8 times
ERROR indicator: Blinks 6 times
<Measure>
Turn OFF the power and
wait for several minutes.
Check the ambient
conditions.
Within specs?
Yes
Turn ON power.
Does error recur?
Yes
Check conductivity of
TEMP signal line.
OK?
Yes
Check thermistor (TH1).
Measuring point
TH1 resistance
• Check the measuring point with
OK?
Yes
Replace logic board.
• Faulty MPU
• Faulty PCB
soldering/conductivity
<Cause>
<Suspected parts>
No
Use the printer under
ambient conditions
within specifications.
No
END
Measuring point
IC1 (MPU) Pin No. 154
TH1
No
Normal value
50 2.5
the carriage cable removed.
No
Thermistor (TH1) on carriage board detects higher
than prescribed temperature limit.
Carriage unit, carriage cable, logic board
Normal value
Approx. 4
Check contact and
conductivity of
carriage cable.
No
OK?
Yes
(25˚C)
Check conductivity of
carriage board.
No
OK?
Yes
5-20
BJC-7100
Reconnect/replace
carriage cable.
Replace carriage unit.