Service manual

11 TROUBLESHOOTING

Introduction

Assembly replacement level troubleshooting and repair of the Taichi portable

telephone is limited to those components listed in the “Replacement Parts”. It

is recommended that known good replacement parts and assemblies be

available to be used for troubleshooting by substitution, and for replacement

of parts/assemblies found to be effective.

Troubleshooting and Repair

The troubleshooting chart shows some typical malfunction symptoms and the

corresponding verification and repair procedures. Additionally the

“Troubleshooting Supplements” are offered to assist in corrective action of

more detailed symptoms.

Refer to the instructions on removing and replacing parts/assemblies from the

portable telephone. If the Logic /Rf assembly is replaced a personality transfer

will be necessary. See the personality transfer page.

GSM Testing after Repair

After any repair work has been carried out, the unit should be thoroughly

tested to ensure that it operates correctly. This is especially important if the

Logic / RF assembly is replaced.

For general repairs which do not include replacing the Logic/RF assembly,

simply placing a call and checking signal strength, and transmit and receive

audio quality is normally sufficient.

When the Logic/RF assembly is replaced, the unit must have a

comprehensive test on a GSM/DCS compatible communications analyzers.

See “Testing” for further details. Placing a call on air is usually carried out at

this stage to complete the testing procedure.

TROUBLE SHOOTING

AND REPAIR CHART

1.PHONE WILL NOT TURN ON

NOTE: Defective Logic/RF assemblies

must be replaced with pre-tested, pre-

phased assemblies.

Note: To replace U900 (GCAP II), BGA

Part, you must have proper equipment and

proper repair training.