Kenwood TK-8108H Service Manual page 31

Test Frequency (MHz)
Channel TX
1 : Center 470.100
2 : Low 450.100
3 : High 489.900
4 470.000
5 470.200
6 470.400
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 R525, R823, R536 and R822 (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 TC402.
ADJUSTMENT
RX
470.050
450.050
489.950
470.000
470.200
470.400
Measurement
Test equipment
Digital voltmeter
SSG
Digital voltmeter
Tra generator
Spectrum analyzer
Adjustment
Terminal Parts Method
CV TC402 5.5V
TC401 5.5V
Check
AFV L301 3.25~3.35V (DC)
ANT TC352 Adjust the BPF waveform
BPF TC353 to Fig. 1
TK-8108H
Specifications/
Remarks
± 0.1V
± 0.1V
0.7V or more
Fig. 1
31