Kenwood TK-7162 E - ADJUSTMENT (Continued); Balance and Deviation Adjustments

TK-7160/7162
32
Item Condition
Test equipment Terminal Parts Method
Specifications/
Remarks
Measurement
Adjustment
If normal power is not obtained, please follow the
step below
Open the shielding cover (upper), and screw 3 locations
around ANT pin.
1. Switch off the transceiver.
Impedance of Power module (IC502) can be measured
easily using DVM Ω mode.
Normal condition
Input : 20kΩ~50kΩ, Output : 1MΩ ~2MΩ
The above impedance values are rough estimations.
ADJUSTMENT
2. Check input power level at Drive FET (Q502) gate location.
Connect the wire to [RF] location.
Transmit and check for power to be within the range of
0.3W~0.6W.
If power found is less than 0.3W, check the circuit before
the Drive FET.
4. Low 1) CH : TX low Power meter ANT PC key 5W ± 1.0W
power CH : TX low’
CH : TX center
CH : TX high’
CH : TX high
2) Transmit
5. DQT 1) CH : TX low (Wide) Modulation analyzer
Adjust the waveform as below
balance CH : TC center or Linear detector
(Wide/Wide 4k/Narrow) (LPF : 3kHz)
CH : TX high (Wide) Oscilloscope
2) Transmit
6. MAX 1) CH : TX low (Wide) Modulation analyzer ANT PC key ± 4.0kHz (Wide) ± 50Hz
balance CH : TC center or Linear detector MIC ±3.2kHz (Wide 4k)
(Wide/Wide 4k/Narrow) (LPF : 15kHz) ±2.0kHz (Narrow)
CH : TX high (Wide) Oscilloscope According to the large +, –
2) AG : 1kHz/50mV AG
3) Transmit AF V.M
7. MIC 1) CH : TX center Check ±3kHz± 0.2kHz
sensitivity (Wide/Wide 4k/Narrow) (Wide)
2) AG : 1kHz/5mV ± 2.4kHz± 0.2kHz
3) Transmit (Wide 4k)
± 1.5kHz± 0.1kHz
(Narrow)
8. DQT 1) CH : TX center Modulation analyzer ± 0.75kHz (Wide) ± 0.05kHz
deviation (Wide/Wide 4k/Narrow) or Linear detector ±0.60kHz (Wide 4k)
2) Transmit (LPF : 3kHz) ±0.35kHz (Narrow)
Oscilloscope
9. QT 1) CH : TX center ±0.75kHz (Wide) ±0.05kHz
deviation (Wide/Wide 4k/Narrow) ±0.60kHz (Wide 4k)
2) Transmit ±0.35kHz (Narrow)
10. DTMF/ 1) CH : TX center LPF : 15kHz ±3.0kHz (Wide) ± 0.2kHz
MSK (Wide/Wide 4k/Narrow) ± 2.4kHz (Wide 4k)
deviation 2) Transmit ±1.5kHz (Narrow)
11. Single 1) CH : TX center
tone (Wide/Wide 4k/Narrow)
deviation 2) Transmit