Motorola MPX200 Service Manual

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Consumer Solutions & Support

US Competency Center
600 North US Highway 45
Libertyville, Illinois 60048

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Website: gs.mot.com

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FSB Number: LVCCFSB2003-404
Authors: Darwin Garcia
Date: December 19, 2003
Total No. of Pages: 2
Subject: MPX200 Keypad Buzz & No Keypad Backlight
Model Affected: MPX200
Level of Repair: 2

Problem

During the NPI analysis, service detected a problem in MPX200 GSM units with AT&T
hardware versions. A keypad buzz and no keypad backlight issues were detected when
the main display backlight is on. These issues are cause by a vendor issue with the EL
(Electro Luminance) module; root cause is yet to be determined. All EL module
shipments from the vendor are being sorted and MPX200 shipments are being screened at
the factory. At this time this issue is affecting all shipments including spare parts. Once
a root cause and corrective action are in place a date code will be available

Solution

Customer phones with high levels of EL noise and no keypad backlight will need to have
the EL module replaced.
Part Desc: METAL DOME EL MODULE
Part # MEBEN16001A

Field Service Action
Customer Returns:

When servicing any MPX200 customer’s phones with described issues, the first step is to
screen the phone for unacceptable levels of EL noise and keypad backlight by following
this procedure:

Screen procedure:

Perform this procedure in a quiet and dark environment.

1. Turn ON the phone

2. Press any key to activate the main display backlight

3. Place the keypad 2-3 inches from your ear.

4. If a high pitch EL noise can be heard, consider it a failure. The noise should turn off
when the backlight is off. The levels of the EL noise will vary and some can heard from
more that 12 inches.

5. If the keypad backlight is not on, consider it a failure.

If the phone is considered a failure, follow the repair procedure bellow.

MOTOROLA INTERNAL USE ONLY Page 1

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Consumer Solutions & Support

US Competency Center
600 North US Highway 45
Libertyville, Illinois 60048

Website: gs.mot.com

Repair procedure:

1. Turn Off the phone

2. Perform Level 2 disassembly until step 6: Remove PCB from case-C.
MPX200 Disassembly Procedure located at:
http://ss.css.mot.com/gsm_root/Level12/html2/documentation/showproduct.cfm?product
=142

3. Remove the shield which has the EL module glued. Be careful not to damage PCB
components. Remove the glued EL module from the shield and clean the glue residues
from the shield.

4. Place the clean shield case to lower the PCBA, the 'L' corner toward the RTC battery
and make sure that the shield case is completely matched the frame.

MOTOROLA INTERNAL USE ONLY Page 2

“L” Corner