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