Kenwood TM-281A, Service Manual

Page: 25 / 50

TM-281A
25
ADJUSTMENT
Item Condition
Measurement Adjustment
Specifi cations / Remarks
Test-
equipment
Unit Terminal Unit Parts Method
3. Low power
[Low] 1) Adj item: [LPL .]
Adjust:
[
✳✳
]
2) Transmit
Power
meter Rear
panel ANT Front
panel Tuning
control Write 25W±1W
[Low’] 3) Adj item: [LPL1.]
Adjust:
[
✳✳
]
4) Transmit
[Center] 5) Adj item: [LPC .]
Adjust:
[
✳✳
]
6) Transmit
[High’] 7) Adj item: [LPH1.]
Adjust:
[
✳✳
]
8) Transmit
[High] 9) Adj item: [LPH .]
Adjust:
[
✳✳
]
10) Transmit
4. DCS balance
• Wide
[Low]
1) Adj item: [BALL.]
Adjust:
[
✳✳
]
Detector: +P HOLD
LPF: 3kHz
HPF: OFF
De-emphasis:
OFF
2) Transmit
Linear
detector
Oscilloscope By turning the Tun-
ing control, adjust
the modulation wave
until it becomes the
square wave.
[Center] 3) Adj item: [BALC.]
Adjust:
[
✳✳
]
4) Transmit
[High] 5) Adj item: [BALH.]
Adjust:
[ ✳✳ ]
6) Transmit
• Narrow
[Center] 7) Adj item: [BALC.]
(“N” icon appear)
Adjust:
[
✳✳
]
8) Transmit
5. MAX devia-
tion
• Wide
[Low]
1) Adj item: [MAXL.]
Adjust:
[
✳✳
]
AG: 1kHz/54mV K,M2,M3
AG: 1kHz/24mV M4
Detector: +P, –P
LPF: 15kHz
HPF: OFF
De-emphasis:
OFF
2) Transmit
Linear
detector
Oscilloscope
AG
AF VM
Rear
panel
Front
panel
ANT
MIC
Write 4.0kHz±0.1kHz (According to
the P, –P)
[Center] 3) Adj item: [MAXC.]
Adjust:
[
✳✳
]
4) Transmit
[High] 5) Adj item: [MAXH.]
Adjust:
[
✳✳
]
6) Transmit
• Narrow
[Center] 7) Adj item: [MAXC.]
(“N” icon appear)
Adjust:
[
✳✳
]
8) Transmit
2.0kHz±0.05kHz (According to
the P, –P)