Gestetner B147 Service Manual page 1000

BULLETIN NUMBER:
APPLICABLE MODEL:
GESTETNER – DSC332/DSC338
LANIER – LD232C/LD238C
RICOH – AFICIO 2232C/2238C
SAVIN – C3224/C3828
SUBJECT: TROUBLESHOOTING COPY QUALITY ISSUES
SYMPTOM:
A RAM access error sometimes occurs when the controller attempts to access the SDRAM DIMM, resulting
in one of the faulty images shown below (band shifting along the main scan direction, solid banding,
stretched banding).
Note:
Occurrence is limited to when SDRAM DIMM memory is inserted in all 3 slots, and shows a factory rate
of approximately 0.56%.
Even if this occurs on a FAX image, the machine will not send the data.
CAUSE:
The response time that the controller requires is sometimes too short for the SDRAM DIMM, preventing the
image from being read out of memory correctly.
SOLUTION:
Production Countermeasure:
SDRAMM DIMM parts are tested so that only those that are able to respond in time are selected for use.
Production Countermeasure
The following controller board has been changed to ensure proper communication between the controller
and SDRAM DIMM.
OLD PART NO. NEW PART NO.
B1475730
B1495730
Copyright  2004 RICOH Corporation. All rights reserved.
TECHNICAL SERVICE BULLETIN
B147/B149 - 006
(permanent):
B1475733 Controller for J-C1y (B146/147)
B1495733 Controller for J-C1z (B148/149)
DESCRIPTION
06/14/2004
REFERENCE
QTY PAGE ITEM
1 97 9
1 97 9
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