Service manual

4.PHONE DROPS THE CALL
TROUBLE SHOOTING OBSERVATION REPAIR SUGGESTED
1.Establish a call and
check if it drops the call
YES
1, Check Reciever and
Transmitter problem Section.
2. Send for Re-Phasing.
5.LOW OR NO ALERT (RINGER) TONE
TROUBLE SHOOTING OBSERVATION
REPAIR
SUGGESTED
1.Check Alert and Alert Contacts on the
radio board
O.K. Replace Alert
2.Check Voltage on Alert_VCC at C940
should measure 4.5V (almost B+)
Not O.K. Replace Q938.
3.Check for Unsolder/Cold Solder
components
O.K. Suspect bad U900
6.SPEAKER LOW AUDIO OR NO AUDIO
TROUBLE SHOOTING OBSERVATION REPAIR SUGGESTED
1.Check Speaker Not O.K.
Replace Speaker Flip
Assembly
2.Check for Cold solder
or
Unsolder pins on J700
and.
Not O.K. Reflow J700.
7.UPLINK AUDIO POWER
TROUBLE SHOOTING OBSERVATION REPAIR SUGGESTED
1.Check Microphone and
J802 Connector
Not O.K.
Replace Microphone or
Replace/ Reflow J910
Connector.
2. Check for Cold solder
or Unsolder components
O.K. Suspect bad U900
8.RECIEVER PROBLEMS
TROUBLE SHOOTING OBSERVATION REPAIR SUGGESTED
1. Check the Antenna
and Antenna Contact Clip
on the PCB.
Not O.K. Replace Antenna or
Reflow or Replace
Antenna Clip.
2. For GSM-Check for
Cold Solder or UNsolder
or Damaged FL460 and
FL470.
Not O.K. Reflow or Replace FL460
and or FL470.
3. For DCS-Check for
cold solder or unsolder or
Not O.K. Reflow or Replace FL450
and or FL465.