Operation Manual

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