Motorola SI44 Service Manual

M

Middle East & North Africa

Personal Communication Sector

Field Service Information

GSM Triplets - Flip Detect Switch

Our Reference: SI377_2004

Date: July 27 2004

Pages (including this page): 3

Prepared by:

Mohamed Morsy
Customer Services Manager,
Middle East & North Africa

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Classification:
Motorola Internal Information
Strictly released for Motorola Authorized Service Center Use only.

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Middle East & North Africa

Date: July 27 2004

Our Reference: SI377_2004

Product/System:

Subject: GSM Triplets - Flip Detect Switch

Problem:

Service is aware of an issue identified during NPI Analysis on GSM Triplets models. Some units, returned
with a customer complaint of “Corrupt/Error CLI Display”, were found to have intermittent operation of the
Flip Detect Switch. As a result of the flip switch not activating properly, the units would show the Carrier
Logo upside down, on the CLI Display with the flip closed, rather than showing the Time/Status. In some
cases, slight pressure applied to the top of the flip would allow the flip switch to activate and the CLI Display
to return to normal. The root cause of these failures was confirmed to be a result of either foreign material
or corrosion collecting on the PCB or Keypad, which would interfere with the gold puck of the keypad
making a good electrical connection with the flip switch contacts (S550) on the PCB.

Foreign Material:
material would extend over the cut out for the flip switch contacts (S550). See diagram 1 below.

Triplets

FIELD SERVICE INFORMATION

The main source of the foreign material was the side-key flex, where some excess

Diagram 1.0 - Contamination from Side-Key Flex

Corrosion:
The gold pucks sourced by Sinco were sub-standard in quality and had a high susceptibility to corrosion
when exposed to environmental conditions in the field. See diagram 2 below. In addition, the Sinco keypads
had an additional air port which directed air inward towards the contact increasing the opportunity for field
failure.
The 3888844N01 keypad is used on V303, V400, V500 and V525.

Diagram 2.0 - Corrosion caused by environments (3888844N01 Sinco Keypad)

The main source of the corrosion was isolated to the 3888844N01 keypad supplied by Sinco.

Classification:
Motorola Internal Information
Strictly released for Motorola Authorized Service Center Use only.