Ricoh C211 Service Manual page 135

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 when the thermal head or power
supply PCB is replaced,
1.
2.
3*
4.
5.
6.
7,
8.
Remove the rear cover of the machine.
Check the voltage noted on the decal, located on the thermal head. (The
voltage varies according to the individual thermal head.)
Disconnect CN-504 [A] of the power supply PCB,
Place the master between the platen roller and the thermal head to protect
the thermal head.
Access 1/0 check mode. (See page 4-1 1.)
. Enter "O"in the memory
display
and "35" in the copy munter
---- VT2300/VT2500 only
Enter "O" in the memory
display
and "34" in the copy counter
---- VT2100/VT21 30/VT2150 only
Press the Print Start key to apply the thermal head voltage.
While holding down the Print Start key, Confirm that the voltage between
pins 3 and 6 on CN504 is at the level specified on the decal (Within +OV,
-Cm/).
If it is not, adjust VR201 on the power supply board.
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