Sharp VC-A30G Serviceanleitung Seite 38

VC-A30G(BR) VC-A30S(BR)
VC-A30GM(BR) VC-A30SM(BR)
VC-A30QM(BR) VC-A30SV(BR)
Colour bar signal
TP1551 (GND)
TP1553 (SIG)
R1564(UHF | R1561 (VHF
AGC control) | AGC control)
UHF: VHF:
3.7+0.05V 3.9+0.05V
Measuring
instrument
Input signal
Test point
Adjusting point
Specification
38
Adjustment of the AFT
Oscilloscope
Signal generator
PIF frequency uniwave
Colour bar signal (70 dBy)
TP1551 (GND)
TP1552 (Video Output)
T002 (AFT coil)
Measuring
instrument
Input signal
Test point
Adjusting point
Specification
1. Receive the colour bar signal (input field
strength: 70 dBy).
2. Using the signal generator, feed the PIF
frequency (38.9MHz) signal (sinewave) to the
tuner IF output terminal.
3. Set the tuning switch to the VHF or UHF position.
Keep the tuning button (+) or (-) depressed
until the beating on the oscilloscope screen be
minimum.
4. Set the tuning switch on the normal position.
Adjust the T002 (AFT coil) so that beating on the
oscilloscope screen be minimum.
vco
IF Module