Kenwood TK-7102H Service Manual page 15

PCB Section
Item Condition
1. Setting 1) Power supply voltage
DC Power supply terminal : 13.6V
2. VCO lock 1) CH : TX high
voltage* 2) CH : RX high
3) CH : TX low
4) CH : RX low
3. IF coil 1) CH : RX center (Wide)
2) SSG output : –53dBm (501µV)
Mod : 1kHz, Dev : 3kHz
4. RF 1) CH : RX center (Wide)
bandpass CH : RX low (Wide)
filter CH : RX high (Wide)
2) Tra generator output : –30dBm
Connect the spectrum analyzer
to BPF terminal
* Adjustment of TX VCO lock voltage
1. Remove R224, R888 (fuse), R803 and R811
(all on component side).
2. Remove PCB from chassis.
3. Transmit and check voltage at [CV] point.
Warning :
Do not transmit if step "1." is not complete.
4. Adjust of voltage can be done by tuning TC2.
Receiver Section
Item Condition
1. Seisitivity 1) CH : RX low (Wide/Narrow)
CH : RX center (Wide/Narrow)
CH : RX high (Wide/Narrow)
2) SSG output
: –118dBm (0.28µV) (Wide)
: –116dBm (0.35µV) (Narrow)
Mod : 1kHz
Dev : ±3.0kHz (Wide)
Dev : ±1.5kHz (Narrow)
2. Squelch 9 1) CH : RX low (Wide)
CH : RX center (Wide/Narrow)
CH : RX high (Wide)
2) SSG output
: –113dBm (0.5µV) (Wide)
: –112dBm (0.56µV) (Narrow)
Mod : 1kHz
Dev : ±3.0kHz (Wide)
Dev : ±1.5kHz (Narrow)
3. Squelch 1 1) CH : RX low (Wide)
CH : RX center (Wide/Narrow)
CH : RX high (Wide)
2) SSG output
: –120dBm (0.22µV) (Wide)
: –119dBm (0.25µV) (Narrow)
Mod : 1kHz
Dev : ±3.0kHz (Wide)
Dev : ±1.5kHz (Narrow)
ADJUSTMENT
Measurement
Test equipment Terminal
Digital voltmeter CV
SSG AFV
Digital voltmeter
Tra generator ANT
Spectrum analyzer BPF
K,M
Measurement
Test equipment Terminal
SSG ANT
Oscilloscope EXT. SP
AF V.M
Distortion meter
TK-7102H
Adjustment
Parts Method
TC2 5.5V
TC1 5.5V
Check
L22 3.2~3.3V (DC)
TC3 Adjust the BPF waveform
TC5 to Fig. 1
Fig. 1
Adjustment
Parts Method
Check
PC key Adjust to open the squelch
Specifications/
Remarks
±0.1V
±0.1V
0.8V or more
K2,M2
Specifications/
Remarks
SINAD
: 12dB or higher
15