Kenwood TK-780 Service Manual Supplement page 55

Item Condition
6. Modulation 1) Set test mode
balanced MIC input : OFF
Select "BAL" in tuning mode. meter
"L BAL"
Deviation meter filter
LPF : 15kHz
HPF : OFF
De-emphasis : OFF
2) "C BAL"
PTT : ON
3) "H BAL"
PTT : ON
7. Maximum 1) Set test mode
deviation Connect AG to the MIC
terminal.
Select "MAX" in tuning mode.
"L MAX"
AG : 1kHz/50mV
Deviation meter filter
LPF : 15kHz
HPF : OFF
De-emphasis : OFF
PTT : ON
2) "C MAX"
PTT : ON
3) "H MAX"
PTT : ON
8. MIC 1) Set test mode
seisitivity CH : CH1 - Sig1
check AG : 1kHz/5mV
PTT : ON
9. QT deviation 1) Set test mode
Select "FQT" in tuning mode.
"L FQT"
Deviation meter filter
LPF : 3kHz
HPF : OFF
PTT : ON
2) "C FQT"
PTT : ON
3) "H FQT"
PTT : ON
10. DQT 1) Set test mode
deviation Select "F DQT" in tuning mode.
"L FDQT"
Deviation meter filter
LPF : 3kHz
HPF : OFF
PTT : ON
2) "C FDQT"
PTT : ON
3) "H FDQT"
PTT : ON
ADJUSTMENT
Measurement
Test-
Unit Terminal Unit
equipment
Power meter Rear ANT
Deviation panel
Oscilloscope
AF VTVM Front MIC
AG panel
TK-780/H
Adjustment
Parts Method
Make the de- (Wide/Narrow)
modulation
waveform neat.
3.8kHz (Wide) 50Hz (Wide/Narrow)
1.75kHz (Narrow)
(According to the
larger +, –)
Check 3kHz 0.2kHz (Wide)
1.5kHz 0.05kHz (Narrow)
0.75kHz (Wide) 50Hz (Wide/Narrow)
0.35kHz (Narrow)
0.75kHz (Wide) 50Hz (Wide/Narrow)
0.35kHz (Narrow)
Specifications/Remarks
55