1.2.105 8555 SYSTEM BOARD DAMAGE AND RELATED HANDLING H021594
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All on Tue Jun 21 20:34:08 2022
1.2.105 8555 SYSTEM BOARD DAMAGE AND RELATED HANDLING
Record number: H021594
Device: D/T8555
Model: M
Tip key: 019
Date created: O90/11/06
Date last altered: A90/11/06
FAILURE ANALYSIS OF RETURNED PS/2 8555 SYSTEM BOARDS HAS
REVEALED THAT SOME BOARDS HAVE PHYSICAL DAMAGE TO THE PHASE
LOCK LOOP (PLL) SIP COMPONENT. THE PLL SIP IS A SMALL CERAMIC
CIRCUIT BOARD, MOUNTED VERTICALLY ON THE SYSTEM BOARD. IT IS
APPROXIMATELY ONE INCH WIDE AND 3/4 INCH TALL, AND IS SOLDERED
TO THE SYSTEM BOARD VERY CLOSE TO THE POWER SUPPLY CABLE
CONNECTORS.
THE REPORTED DAMAGE IS A RESULT OF THE PLL SIP BEING BENT AT
ITS SYSTEM BOARD CONNECTORS. THE PLL SIP IS SUPPOSED TO BE
MOUNTED AT A 90 DEGREE ANGLE TO THE SYSTEM BOARD. ITS DESIGN
WILL PERMIT SOME CONNECTOR BENDING (UP TO A 20 DEGREE ANGLE
FROM ITS INTENDED PERPENDICULAR MOUNT). ONCE BENT, HOWEVER,
THE PLL SIP MUST NOT BE STRAIGHTENED.
*** IMPORTANT ***
- ON THE REPLACEMENT SYSTEM BOARD FRU, IF THE PLL SIP IS BENT
TOWARD THE POWER SUPPLY CONNECTOR, AND INTERFERES WITH
PLUGGING IN THE POWER SUPPLY CABLES, DO NOT STRAIGHTEN THE
PLL SIP. RETURN THE SYSTEM BOARD AS NEW DEFECTIVE.
- IF BENT AWAY FROM THE POWER SUPPLY CONNECTOR, AND IF THE
SYSTEM BOARD OPERATES, THE SYSTEM BOARD SHOULD BE CONSIDERED
GOOD. DO NOT STRAIGHTEN THE PLL SIP.
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