MASTER MAKING SECTION
ADJUSTMENT
GR37704 - 3
2. ADJUSTMENT
1. THERMAL POWER OF THERMAL PRINT HEAD
PROCEDURE
1) Turn off the power, and remove the Front right cover.
2) Connect a voltmeter between pins TP1(+) and TP2(GND) on the power supply PCB.
3) Turning ON Test Mode No.77 (TPH/CTL signal), confirm that the voltage displayed on the voltmeter conforms
to the setting table according to the thermal print head resistance value.
5) If not, adjust it by turning 100V system: VR100/VR101 and 200V system: VR401/VR402 on the power supply
PCB.
6) On completion of adjustment, turn off the power and detach the voltmeter.
7) Carry out master-making and confirm results.
- Precautions in Adjustment -
• This adjustment has to be made every time the thermal print head is replaced.
• The Scanner table should be closed to apply power to the thermal print head.
Othewise, the interlock SW will interrupt the power.
- Results of misadjustment -
• If the voltage is too high ; solid print image will be deformed and the heating elements of the thermal print head
will be liable to damages due to over heat.
• If the voltage is too low ; thin horizontal lines cannot to reproduced clearly.
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