Gestetner B147 Service Manual page 1004

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 (Permanent):
The following controller board has been changed to ensure proper communication between the controller
and SDRAM DIMM.
GENERAL:
The following part information is being issued for all B147/B149/B190 Parts Catalogs.
OLD PART NO. NEW PART NO.
B1475730
B1495730
16017879
16090026
16504470
16340000
Copyright  2005 RICOH Corporation. All rights reserved.
TECHNICAL SERVICE BULLETIN
B147/B149/B190 – 006 REISSUE
B1475733 Controller Board (B147)
B1495733 Controller Board (B149)
16017757 Resistor – 0 Ω
16090011 Resistor – 22 Ω ±5% 1/16W
16071520 Filter - BLM18BA470SN1B
16504470 Resistor – 47 Ω ±5% 1/10W
DESCRIPTION
w w w . R i c o h U n i v e r s i t y. c o m
01/18/2005
REFERENCE
QTY PAGE ITEM
1 97 9
1 97 9
- 140 153
- 140 174
- 140 198
- 140 181
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