Motorola GM640 Информация о сервисе - Страница 25
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Troubleshooting Flow Chart for 25W Transmitter (Sheet 1 of 3)
2.0
Troubleshooting Flow Chart for 25W Transmitter (Sheet 1 of 3)
Check Components between
Q3441 and RF Output,
Antenna Switch
D3471,D3472,Q3472
Check PA Stages
Check 9.3 V Regulator
U0641
Replace PCIC U3501
If U3201 Pin 2 is high,
replace PCIC
U3501,otherwise
check controller and
FGU
Check Power Setting,
Tuning & Components
between PCIC Pin 5
and ASFIC (U0221)
Pin 4 before replacing
ASFIC
Replace PCIC U3501
START
No or too low Power when keyed
Check if Pressure Pad closes S3440
Current
>500mA & <4A
>4A
increase
when keyed?
<500mA
Control
YES
Voltage at
TP3402
>1V
NO
NO
PCIC U3501
Pin 14 9.3V
DC?
YES
NO
PCIC U3501
Pin 16 >4V
DC
YES
NO
TP3404
9.1V DC
YES
NO
PCIC U3501
Pin 5 > 1V
DC?
YES
YES
TP3403
>0.5V DC?
NO
Check Forward Power
Sense Circuit (D3451)
Short TP3403 to
NO
Check PA Stages
Check Forward Power
Sense Circuit (D3451)
3-3
Ground
Voltage at
TP3402
rises?
YES