Master Feed Section; Thermal Head Voltage Adjustment - Ricoh C226 Service Manual

5. MASTER FEED SECTION

5.1 THERMAL HEAD VOLTAGE ADJUSTMENT

Purpose: To maintain master making quality and extend the lifetime of the
thermal head.
NOTE: This adjustment is always required whenever the thermal head or the
power supply board is replaced.
[B]
1. Remove the rear cover and the right cover of the machine.
2. Disconnect the connector [A] from the plotter unit.
3. Check the voltage that is recorded on the decal located on the thermal
head.
(The voltage is different for each thermal head.)
4. Access "I/O Check Mode".
•
SP mode No. 131, then Output Check mode 41.
5. Press the Start key to apply the thermal head voltage.
WARNING: Press the Stop key to stop applying the thermal head
voltage.
Do not keep the thermal head voltage on for a long period.
6. Confirm that the voltage between one of the VHD terminals (PIN 8) and
one of the ground terminals (PIN 1) of CN503 is at the level specified on
the decal (Within + 0 V, – 0.1 V).
7. If incorrect, adjust VR1 [B] on the power supply board.
SM
MASTER FEED SECTION
[A]
5-17 C226