Thermal Head Voltage Adjustment - Ricoh C231 Service Manual

6.5.3 THERMAL HEAD VOLTAGE ADJUSTMENT

PURPOSE: To maintain master making quality and extend the lifetime of the
thermal head.
ADJUSTMENT STANDARD:
Refer to the voltage value (X) printed on the thermal head. The value varies from
one thermal head to another.
The adjustment voltage should be between X and X - 0.1 V.

CAUTION
This adjustment is always required when the thermal head or power supply unit
has been replaced.
1. Turn off the main switch and disconnect the power plug.
2. Remove the front cover and panel cover (6 screws).
3. Disconnect CN503 [A] on the power supply unit.
4. Read the voltage value on the decal on the thermal head.(not shown)
5. Connect the power plug, and turn on the main switch to access SP mode,
#131, output check mode.
6. Select the thermal head power supply output check mode 41.
SM
[A]
6-21
MASTER FEED SECTION
C231R549.WMF
C231/C237/C238