Thermal Head Voltage Adjustment - Ricoh C274 Service Manual

Don't touch the surface with bare hands. (If you touch it, clean the surface with
alcohol.)
Don't touch the terminals of the connectors with bare hands.

4.6.3 THERMAL HEAD VOLTAGE ADJUSTMENT

This adjustment is always required when the thermal head or PSU has been
replaced.
Purpose: To maintain master making quality and extend the lifetime of the thermal head.
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.
Tools: Circuit tester
Remove the rear cover (
Read the voltage value on the decal on the thermal head.
1. Connect the positive terminal of a circuit tester to TP701 and the negative terminal to
TP702 on the PSU.
If the output and ground terminals touch each other, the board will be
damaged.
2. Connect the power plug, and turn on the main switch to access SP mode.
3. Select SP2-41 (Thermal head signal output).
4. Press the # key. Power is continuously supplied to the thermal head, which could
damage the thermal head, so press the clear/stop key if you cannot finish the
adjustment quickly.
SM
CÓPIA NÃO CONTROLADA
Covers / Boards - Rear Cover)
4-19
CÓPIA NÃO CONTROLADA
Master Feed
C274