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Motorola GmbH, CSS Center, Mobile Devices

Title:

Troubleshooting-Guide V3

5.0 U700

Customer complaint

- TONxx

1. Check the phone with a test battery. When the phone turns on, check the

customers charger and battery.

2. Disassemble the phone and try to boot the PCB with EMU connector if the

phone starts up, check the customers housing.

3. If the phone starts in flash-mode (yellow status) when connecting with the

EMU connector, try to reflash with 1FF-flash file. If this is not successful

replace U700.

4. When the phone starts in blank- mode (yellow status)when connecting with the

EMU connector, try to make a reflash with an Image-flash file. If is this not

successful replace U700

5. If the phones current drain is ~55mA (red status) and decreases after a few

seconds to ~6mA when connecting with the EMU connector also replace

U700.

5.1 U50

Customer complaint

- CPRxx / TONxx

1. Connect the phone with the EMU connector while monitoring the current

drain. If U50 (PA) is defect, you could have a short to ground (board does not

start/disconnects immediately). Occasionally the PA draws slightly more than

the nominal current (check nominal current with a reference-board ~40mA). If

the PA gets hot, replace the PA (U50).

2. Check TX-output spectrum by setting the phone in TX-mode using the

spectrum-analyzer. Compare level and shape of the spectrum with a

reference-board if the level is to low or the spectrum looks bad replace U50.

3. Also check to the time mask with a GSM-Test-Set. If the signal does not

conform to specifications, replace U50.

Repair Support Information

Flash-Part / EE-Prom / SRAM

Power-Amplifier (Eagle-IC)

Doc. No:

Version:

Date:

Page:

Motorola internal use

TSG_V3

1.1

09.06.2005

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