Kenwood TK-80, Service Manual

Page: 50 / 125

TK-80
49
Item Condition
Measurement Adjustment
Specifications/Remarks
Test-
equipment
Unit
Terminal
Parts Unit Method
ADJUSTMENT
PLL and CAR Section
1. Reference 1) M CH: 01 f. counter TX-RX TP501 TX-RX TC501 20.00000MHz
±
20Hz
frequency (probe
adjustment 10 : 1)
2. 62.35MHz 1) M CH: 01 TP506 TC502 62.35000MHz ± 20Hz
adjustment
3. 10.695MHz 1) M CH: 01 Oscilloscope TP503 L539 1.4Vp-p ± 0.2Vp-p
adjustment
4. 54MHz BPF 1) M CH: 01 TP505 L513 Repeat adjustment 1.0Vp-p or more
adjustment L514 2 to 3 times as the
L515 level of 26.5MHz.
Level maximum
5. VCO1 1) M CH: 02 D.V.M TP504 TX-RX TC503 2.0V
±
0.1V
lock voltage
check
2) M CH: 03 Check 7.0V or less
6. VCO2 1) M CH: 04 TX-RX TC504 2.0V ± 0.1V
lock voltage
check
2) M CH: 05 Check 7.0V or less
7. VCO3 1) M CH: 06 TX-RX TC505 2.0V ± 0.1V
lock voltage
check
2) M CH: 07 Check 7.0V or less
8. LO1 1) M CH: 08 RF V.M CN501 Level check –0.5~+5.0dBm
level check Pull out CN501 (LO1). 50
Ω
Insert CN501 after the check. terminated
9. LO2 1) M CH: 08 CN502 TX-RX (L531) Level check 0~+3.0dBm
(62.35MHz) Pull out CN502 (LO2). 0dBm or less:
level check Insert CN502 after the check. Maximum for L531
Item Condition
Measurement Adjustment
Specifications/Remarks
Test-
equipment
Unit
Terminal
Parts Unit Method
Receiver Section
1. AGC 1) M CH: 08 D.V.M TX-RX TP2 TX-RX VR6 2.9V
±
0.03V
adjustment
2. MCF 1) Pull out CN502 (LO2). Spectrum CN7 L38 Repeat adjustment
adjustment M CH: 08 analyzer L42 2 to 3 times to obtain
Spectrum analyzer setting L43 a maximum gain.
TG level: –30dBm Tracking CN4 Adjust the waveform
Center f.: 73.045MHz generator as shown to the
Frequency span: 70kHz right.
ATT: 10dB
V. REF: 2dB/DIV
Insert CN502 after the check.
73.045
73.052 73.038
(MHz)