31
VC SA350/350W
VC-SA355
VC-SA550/550W
Measuring
instrument
Mode
Test point
Colour TV monitor
DV voltmeter
Pin(1)(AF1) of TP101.
Pin(4)(GND.) of TP101.
Control
R1601 VCO control
Specification
2.5
±
0.5V
1.Set VCR to Power on mode.
2.Press “Test key” mode.
3.Press channel E-12 of R/C at 87.5% modulated and
70dBV of antenna terminal (Caution : Do not press SW
button on set, use R/C).
4.Connect a DC voltmeter to test point shown in table.
5.Look at the voltmeter and adjust T1601 at voltage
specified.
ADJUSTMENT OF VCO CIRCUIT
RF signal at E12-CH (by VHF
signal generator)
Measuring
instrument
Mode
Test point
Colour TV monitor
DV oscilloscope
Control
R1626 RF AGC control
Pin(3)(Sig.) of TP101.
Pin(4)(GND.) of TP101.
ADJUSTMENT OF RF AGC CIRCUIT
RF signal at E12-CH (by VHF
signal generator)
1.Receive E-12 channel signal at 87.5% modulated and
70 dBV of antenna signal.
2.Connect oscilloscope to test point shown in table.
3.Look at the oscilloscope and adjust R1626 Counter
clock wise untill sync-tip become from noisy to clear just
before shrink position.
4.Press “Test key” mode and auto tune to receive signal.