Motorola V547, V551, V555, E550, V545 Service Manual

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Consumer Solutions & Support
US Competency Center
600 North US Highway 45
Libertyville, Illinois 60048

Website: gs.mot.com

FIELD SERVICE BULLETIN

FSB Number: LVCCFSB2005-52
Author: Tony Bryan
Date: March 21, 2005
Total No. of Pages: 3
Subject: GSM Intermittent Alert – Pogo-Pin Contact Force
Phone Models: GSM V547, V551, V555, E550/V535, V545/V550, V300,

V303, V400, V505, V500/V525

Level of Repair: 2

Problem

Service is aware of an issue, identified in the NPI Analysis of the GSM San2rini
and Triplets Refresh products. Some units, returned with customer complaints of
“Alert– Ringtone No” and other related complaints, were found to be caused by
poor mechanical connection between the alert pogo-pins and the contacts of the
polyphonic speaker. This failure mode is extremely intermittent and can be
recovered and induced by flexing the rear housing in the area of the alert.
The root cause has been determined to be the lack of adequate spring force
between the pogo pins and the alert contacts, at the actual measured working
height of the pin. Pogo pin force vs. deflection measurements show that the
tested units have at least 1 pin that has low contact force.

MOTOROLA INTERNAL USE ONLY Page 1

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Consumer Solutions & Support
US Competency Center
600 North US Highway 45
Libertyville, Illinois 60048

Solution

Website: gs.mot.com

A re-design of the 3988194N01 pogo-pins was completed to increase the
specification for contact force at the nominal pin working height by 30g (+/-10g).

New Pogo-Pin Part Number: 3988427Z01

Note: New design is identical in appearance to the original design

The factory cross-over to the new 3988427Z01 pogo-pin design was started, for
the affected products listed above, on 3/14/2005. To assist in identification during
the cross-over, the factories will add a marking to the current PCBA Label to
indicate which pogo-pin was placed. See image below.

For all the PCBA soldered with
new pogo pin 3988427Z01, a
letter ”Z” must be added on the
label at the end of line 1,

Field Service Action

Customer Returns:

When servicing affected GSM customer returns, with customer complaints of
“Alert– Ringtone No” and any other complaints related to audio through the
polyphonic speaker, regardless if the complaint is confirmed or not, then:

1. Disassemble the housing and remove the PCBA.

2. Inspect the Factory PCBA Label to determine which pogo-pin has been
placed. See image above.

a. If the Factory PCBA Label indicates the new 3988427Z01 pogo-pin

has already been placed, then proceed with normal troubleshooting
techniques per the customer complaint.

3. Replace the 3988194N01 pogo-pin (J1260) with the new 3988427Z01
pogo-pin design.

4. Reassemble the unit and completely retest to ensure unit has been
properly repaired.

a. If the unit still exhibits failure symptoms, then proceed with normal

troubleshooting techniques per the customer complaint.

MOTOROLA INTERNAL USE ONLY Page 2