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computers / comp.sys.ibm.ps2.hardware / H12761 TWINAX ATTACHED DEVICES DROPPING OFF LINE

SubjectAuthor
* H12761 TWINAX ATTACHED DEVICES DROPPING OFF LINELouis Ohland
`- Re: H12761 TWINAX ATTACHED DEVICES DROPPING OFF LINEIBMMuseum

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H12761 TWINAX ATTACHED DEVICES DROPPING OFF LINE

<smmff4$21j5$1@842ffb22-07e1-11e5-a459-00266cf00584.csiph.com>

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https://www.novabbs.com/computers/article-flat.php?id=1318&group=comp.sys.ibm.ps2.hardware#1318

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From: ohl...@charter.net (Louis Ohland)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: H12761 TWINAX ATTACHED DEVICES DROPPING OFF LINE
Date: Fri, 12 Nov 2021 13:30:51 -0600
Organization: csiph.com Internet News Service
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 by: Louis Ohland - Fri, 12 Nov 2021 19:30 UTC

5250 EMULATION ADAPTER/A OPTION KITS
P/N 64G3496 (EMEA), P/N 64G3494 (USA), AND
P/N 64G3495 (FRU) SHIPPED AFTER MAY 1993 MAY
CAUSE OTHER TERMINALS OR SYSTEMS TO DROP OFF THE
COMMUNICATIONS LINE WHEN THE 5250 ADAPTER CARD'S
SYSTEM UNIT IS POWER OFF. THE LINE MAY DROP
MOMENTARILY OR MAY REMAIN DOWN UNTIL POWERED OFF
UNIT IS TURNED BACK ON. THIS PROBLEM MAY OCCUR
IN ANY MICROCHANNEL BUS MACHINE.

THIS PROBLEM MAY ALSO SHOW UP IF CUSTOMER IS
EXPERIENCING TROUBLE TRYING TO ESTABLISH HOST
SESSIONS WITH OTHER TWINAXIAL DEVICES ON THE
LINE. IF A POWERED OFF 5250 CARD IS ON THE
SAME LINE AS THE TROUBLED DEVICE, CHECK THE
LEVEL OF THE 5250 CARD FOR THE PROBLEM CARD
ASSEMBLY LISTED BELOW.

AFFECTED 5250 ADAPTERS CAN BE IDENTIFIED BY
CARD ASSEMBLY P/N 64G3513 ON A LABEL ON THE CARD.
AFFECTED CARDS CAN ALSO BE IDENTIFIED BY THE FRU
P/N 64G3495 LABELED ON THE BLUE CARD HOLDER.
THIS LEVEL OF CARD IS THE ONLY CARD WITH THE
PROBLEM.

NOTE: P/N 64G3513 IS A MANUFACTURING PART NUMBER
AND NOT THE FRU NUMBER.

AFFECTED CARDS CAN BE REWORKED TO NEW LEVEL CARD
ASSEMBLY P/N 64G3508 IN THE FIELD BY REMOVING
SMT (SURFACE MOUNT TECHNOLOGY)
RESISTORS R35 AND R34. THESE CAN BE REMOVED
BY USING NEEDLE NOSE PLIERS TO BREAK OFF THESE
RESISTORS. THE PADS FOR THESE COMPONENTS MAY
COME OFF DURING THIS OPERATION BUT THIS WILL
NOT AFFECT THE PERFORMANCE OF THE CARD.
R34 AND R35 ARE LABELED ON THE CARD AND ARE
LOCATED NEAR THE BOTTOM RIGHT SIDE IF THE CARD
BELOW DIODES D3,D5,D6. BOTH OF THE RESISTORS
SHOULD BE COMPLETELY REMOVED.

FRU STOCK IS BEING REWORKED TO NEW LEVEL
P/N 64G3506 AND WILL BE AVAILABLE THROUGH NORMAL
CHANNELS.

Re: H12761 TWINAX ATTACHED DEVICES DROPPING OFF LINE

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Date: Fri, 12 Nov 2021 20:35:50 -0800 (PST)
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Subject: Re: H12761 TWINAX ATTACHED DEVICES DROPPING OFF LINE
From: ibmmus...@gmail.com (IBMMuseum)
Injection-Date: Sat, 13 Nov 2021 04:35:50 +0000
Content-Type: text/plain; charset="UTF-8"
 by: IBMMuseum - Sat, 13 Nov 2021 04:35 UTC

> AFFECTED CARDS CAN BE REWORKED TO NEW LEVEL CARD
> ASSEMBLY P/N 64G3508 IN THE FIELD BY REMOVING
> SMT (SURFACE MOUNT TECHNOLOGY)
> RESISTORS R35 AND R34. THESE CAN BE REMOVED
> BY USING NEEDLE NOSE PLIERS TO BREAK OFF THESE
> RESISTORS. THE PADS FOR THESE COMPONENTS MAY
> COME OFF DURING THIS OPERATION BUT THIS WILL
> NOT AFFECT THE PERFORMANCE OF THE CARD.
> R34 AND R35 ARE LABELED ON THE CARD AND ARE
> LOCATED NEAR THE BOTTOM RIGHT SIDE IF THE CARD
> BELOW DIODES D3,D5,D6. BOTH OF THE RESISTORS
> SHOULD BE COMPLETELY REMOVED.

Wow, this EC "rework" notification really amazes me - I've noticed color coding on the edge of 5250-related adapter PCB - I wonder if it is a quick visual identifier for an EC.

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