Sharp VC-FH3GM/SM Serviceanleitung Seite 30

VC-FH3GM/SM
VC-FH5GM
ADJUSTMENT OF PAL SYSTEM FV(False
Vertical Sync) OF STILL PICTURE
Measuring
Colour TV monitor
instrument
Mode Playback siill
Self-recorded tape (SP mode)
(See Note below @))
Tracking contro! buttons (+) or (-)
No vertical jitter of picture
1. Play a cassette which was recorded by the unit in SP
- mode.
2. Press the PAUSE/STILL button to freeze the picture.
3. Look at the monitor screen and adjust (+) or (-)
~ TRACKING buttons so that the vertical jitter of the
picture to be minimized.
4. Play and freeze the self-recorded tape in SP mode
- and make sure vertical jitter of the picture is not
'noticeable.{For the LP mode put adjustment at the
same adjustment way as SP mode.)
Note:
@) The FV goes back to the it's initial state when the unit
is put into the system controller reset mode due to
power failure, etc.
In this case, preset the FV once again.
@) Self-recorded tape is a cassette whose program was
recorded by the unit being adjusted.
Cassette
Control
Specification
30
ADJUSTMENT OF RF AGC
Colour TV monitor
DV voltmeter
RF signal at 12 CH(by VHF
signal generator)
Pin(2)(Sig.} of P1501.
Pin(4)(GND.) of P1501.
Control R1626 RF AGC control
Specification 41t 0.2V
1.Receive the 12 channel signal (colour bar signal at
- 87.5% modulated.) at input field strength: 62 dBu of:
. antenna terminal.
2.Connect a DC voltmeter to test point shown in table.
3.Look the volimerter and adjust R1626 so that the
voltage be specified.
Measuring
instrument
Test point
ADJUSTMENT OF VCO CIRCUIT
Measuring Colour TV monitor
instrument DV voltmeter
RF signal at 12 CH(by VHF
signal generator) |
Test point Pin({1){Sig.) of P1501.
Pin(4)(GND.) of P1501.
T1601 VCO contro!
Specification 2.5+0.5V
Note:
When power is turned on, tune in to station in the test
mode.
1.Receive the 12 channel signal(colour bar signal at
87.5% modulated.) at input field strength: 70dBu of
antenna terminal.
2.Connect a DC voltmeter to test point shown in table.
3.Look the voltmerter and adjust T1601 so that the
voltage be specified.