User Guide

After Sales
Technical Documentation
THA–4S
Troubleshooting Guide
Page 8
Original, 12/95
Receiver Fault (2)
A
B
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
N
N
N
N
N
N
N
N
N
Check RF
level at G200/out
–32dBm
1.5Vpp/14.4
Injection level
at C265
Check G200
Check V225/c
1.8 Vdc
Check
R226, R303, R299, V225,
R202, C329, C326, V200
Check
R202, R326, C329,
Check N201
pin4 = 1.9 Vdc
Check RF
level at C220
–66 dBm 86.85
RX level –30dBm
Check
L204, C215, N201, L205
C225
Check
V202, R203, R204
Check RF
level at C210
–55dBm
86.85MHz
Check
Z206
Check RF
level at C206
–47dBm
86.85MHz
Check RF
level at V200/c
–53dBm
881.4 MHz
Check
L201,L202, VR201,
Check
V200
Replace duplex filter
Z201
Check RF
level at L217
–66dBm
881.4 MHz
–50dBm
881.4 MHz
Check
Z202, C235
Check RF
level at C206
14.4 MHzMHz
MHz
C207
V200