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32 – LED Head Overheat
1. Check the output of the HTS (head thermal sensor).
a. Put the positive lead of the digital multimeter on pin 13 of IC33 on the I/O
b. Measure the voltage. If it is not about 5V, replace the I/O board. However, if
2. Check the I/O board.
a. Remove connecting jack J24 from CN24 on the I/O board.
b. Put the positive lead of the digital multimeter on pin 7 of CN24 on the I/O
c. Measure the voltage. If it is not about 24V, check CN31 on the I/O board for
3. Check the HCF (head cooling fan).
a. Put the positive lead of the digital multimeter on pin 6 of CN 24 on the I/O
b. Measure the voltage with the power ON. If it is not about 0V, replace the
4. Check the strobe length. If necessary, set the length according to the inspection
sheet located inside the printer. This requires the use of an engine checker. (Refer
to Chapter 9, "Board Adjustments," and to Chapter 8, "Engine Checker.")
7–80
CHECKLIST:
HEAD THERMAL SENSOR (HTS)
I/O BOARD
HEAD COOLING FAN (HCF)
board, and the negative lead on the SG.
the head cooling fan (HCF) is operating with the power OFF, go to Step 4.
board, and the negative lead on the PG.
the following voltages:
Pin 7 =
+24V
Pin 8 =
+24V
If these voltages are not correct, replace the DC Power Supply board. If they
are correct, replace the I/O board.
board.
HCF.
Troubleshooting
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