User Guide

After Sales
Technical Documentation
THA–4S
Troubleshooting Guide
Page 9
Original, 12/95
Transmitter Fault (1)
A
B
Transmitter
fault
Y
N
N
N
N
Y
Y
Y
Y
TSYN = 4.85Vdc
V222/pin 5
Channel 380 RX level –60dBm
PROBE 10:1 10 Mohm/14pF
Tx freq.
CD
N
Y
N
N
N
Y
E
Y
Y
Y
A
N
N
N
Change of
power level
possible
Alignment
level 2 in Tesla
possible
Re–align in Tesla
N
R274 power
level 2
V>0Vdc
Check
R273, R241, V214
C306
POWER_LEVEL
CTRL change
possible
Output power
836.4000MHz
Check
VCTCXO, G200,
D101/pin 64 (PWM)
C318, R296
RF level L214
–27dBM
4.4Vdc
Check
R295, R230, V222
Check
V222, R293, V223,
R298, N202
Check
Lock detect
is high
>4.0Vdc
V210/c =3.2Vdc
N
N
N
Y
Check
R254, V209, V210,
R255, R251, R252,
R253
Voltages at J201
1–4Vdc
Check
C274, C275, C273,
L210, C268, V208,
C271
Y
Freq. at L214
131.85MHz
RF level
–34dBM
Y
Y
Y
Check
R233, N202
Check
C280, R250, N202
Check loop filter
between N202/pin 15
and V208
V216/c > 0Vdc
V215/pin 13
2.4Vdc
N204/pin 1
>0Vdc
POWER_LEVEL
CTRL>0Vdc
Check
D100
N
N
N
N
Y
Y
Y
Y
at N202/pin 15