Service manual

TROUBLESHOOTING OBSERVATI
ON
REPAIR SUGGESTED
1. Check with a known good battery O.K. Replace battery
2. Check the battery contacts NOT O.K. Replace Battery contacts
3. Keypad back light on but no
display
YES replace keyboard
4. Check the power button on the
keypad
and mylar
NOT O.K. Replace keypad/Mylar
5. Check for V_Boost 1 at C934 for
4.5V
NO/Low
Voltage
U900 Suspect bad
6. Check for V1 C225 for xxV NO/Low
Voltage
U900 Suspect bad
7. Check for LS_V1 at C929 NO/Low
Voltage
U900 Suspect bad
8. Check for V2 at C924 for 2.775V NO/Low
Voltage
U900 Suspect bad
9. Check for V3 at C926 for 2.00V NO/Low
Voltage
U900 Suspect bad
10. Check for Vref at C939 for 2.75V NO/Low
Voltage
vU900 Suspect bad
11. Check for Reset at C724 for
2.75V
NO/Low
Voltage
vU900 Suspect bad
12. Check for RF_V1 at C240 for
2.75V
NO/Low
Voltage
Replace Q240 then suspect bad
U201
13. Check for RF_V2 at C242 for
2.75V
NO/Low
Voltage
Replace Q242 then suspect bad
U201
14. Check for 13MHz Clk at R224 CLK not
present
Replace y230 then suspect bad
U201
2.PHONE CANNOT MAKE OR RECIEVE CALL
TROUBLE SHOOTING OBSERVATIO
N
REPAIR SUGGESTED
1. Phone will not
Camp(Register)
No service
strength
indicator bar(s)
1. Check the Receiver problems
section.
2. Send for Rephasing
2. Phone Camps but will make
a call
Shows Service
Strength
indicator
1. Check the Transceiver problems
section.
2. Send for Re-Phasing.
3.PHONE SHOWS POOR RECEPTION
TROUBLE SHOOTING OBSERVATION REPAIR SUGGESTED
1. Phone shows poor
reception in a known
good area.
Low Signal Strength
Indicator.
1. Check the Receiver
problems section.
2. Send for Re-Phasing.