Ricoh C211 Service Manual page 766

BULLETIN NUMBER:
APPLICABLE MODEL: VT2130
SUBJECT: INK ON REVERSE SIDE OF PRINTS AND MASTER DAMAGE
NOTE: There are two types of master for the VT2130 Priport. They are the VT-II-M/S (new style) and the
VT-M/S (old style). The VT-II-M/S is slightly more sensitive to the heat of the thermal head than the
old style VT-M/S. The following symptom applies to the VT-II-M/S master only.
SYMPTOM:
1. Ink off-set on the reverse side of prints.
2. Peeling of the master surface (the polyester film layer) during printing. The damaged areas will app ear
as black patches on prints.
CAUSE:
The thermal head produces holes that are larger than required on the master.
SOLUTION:
Adjust the intensity of the thermal head by the following procedure:
1. Install the new style Image Processing PCB ROM - IC422. This ROM, (C2119006), enables a wider
adjustment range of the thermal head output via DIP Switches.
NOTE: This ROM can be obtained through normal NSPC channels or by downloading a Hex file for local
programming via the Ricoh Technical Services BBS (refer to Service News and Information No.147)
2. Reduce the thermal head output by 15% by setting DPS400-5 of the Image Processing PCB to OFF
and DPS400-6 to ON (see table below).
DPS400-5
DPS400-6
Thermal Head Energy
NOTE: 1. Although the thermal head input voltage can be reduced by performing the Thermal Head Voltage
Adjustment procedure found in the Field Service Manual, this will not prevent the above mentioned
symptom. The new ROM enables the adjustment of the pulse length which determines the period
that voltage is applied to the thermal head.
2. After reducing the thermal head output, solid fill areas will appear slightly lighter. Therefore, you
should not reduce the thermal head energy by more than 15%.
3. If the fences on the paper delivery table are not adjusted exactly to the paper size used,
off-setting on the reverse side of prints will increase.
SS830/950/VT2130-045
ON
ON
STANDARD
ON OFF
OFF ON
-10% -15%
05/12/95
OFF
OFF
-20%