Motorola GM140 서비스 정보 - 페이지 24
{카테고리_이름} Motorola GM140에 대한 서비스 정보을 온라인으로 검색하거나 PDF를 다운로드하세요. Motorola GM140 32 페이지. Gm series professional radio uhf (403-470mhz)
Motorola GM140에 대해서도 마찬가지입니다: 서비스 정보 (34 페이지), 기본 서비스 매뉴얼 (46 페이지), 서비스 정보 (32 페이지)
3-2
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)
1.1
B
Inject RF into J4401
IF Signal at
C3101?
No
RF
Signal at
T4051?
No
RF
Signal at
C4015?
No
RF
Signal at
C4009?
No or
weak RF
RF
Signal at
C4025?
No
Check harmonic filter
L4491-L4493, C4492, J4401
and ant.switch
D4471, D4472, L4472.
Trace IF signal
Yes
from C3101 to
Q3101. Check for
bad XTAL filter.
Yes
No
1st LO level
OK?
Locked?
Check T4051, T4052,
D4051, R4052, L4008.
Yes
Yes
Check filter between
C4015 & T4051.
Yes
Check RF amp (Q4003)
Stage.
Check filter between
Yes
C4025 & C4009.
Check tuning voltage
at R4060.
signal at Q3102
collector?
No
Check FGU
Check for
No
No
Check Supply Voltage
circuitry. Check Q0681,
U4211 and U0641.
Is
Yes
tuning voltage
OK?
No
Check U4501.
TROUBLESHOOTING CHARTS
IF
Yes
Before replacing
U3101, check
U3101 voltages.
Yes
A
5VDC
Yes
Is 9V3
A
present?
Check varactor filter.