Sharp VC-A310X/NZ Service Manual page 29

SERVO CIRCUIT ADJUSTMENT
ADJUSTMENT OF HEAD SWITCHING POINT
Measuring Dual-trace oscilloscope
instrument Colour TV monitor
Mode Playback
Cassette Alignment tape (VROFBZD)
Test point Pin(2) of TP201 (H.SW.P.) to CH-
1, VIDEO OUT jack to CH-2
(CH-1 trigger slope switch at (+),
Internal trigger at CH-1 side.)
6.5 ± 0.5H (lines)
Specification
1. Remove the front panel and play the alignment tape.
(VROFBZD)
2. Get TP801 short circuited or press "TEST" key (47H) at
universal remote control to call the Test Mode.
(LCD will blinking as tracking goes to center)
3. Press "PLAY".
Auto PG Mode will be ON and playback mark " > "
blinking.
4. Press "STOP".
" > " blinking stops and auto adjustment finished.
5. Check that V-Sync is 6.5 ± 0.5H and the waveform is as
shown in Figure 5-2.
Note:
For manual PG adjustment, press FF or REW at the
Test Mode to set the tracking in center.
CH-2
Video signal
CH-1 6.5 ± 0.5H
HEAD
SWITCHING
PULSE
TRIG INT CH-1
Figure 5-2.
ADJUSTMENT OF PAL SYSTEM SP/LP/EP
SLOW TRACKING PRESET
1. Have the unit to receive a good TV broadcast or feed a
2. Set the tape speed in SP mode by using the remote
3. Rewind and play the tape where signal was recorded in
4. Press the SLOW button on the remote control, and
5. Make for a moment short-circuit TP801, located at the
6. Look at the monitor screen and adjust the (]) or ([)
7. Press the STOP button to return to normal mode.
8. Play the tape a few seconds then press the SLOW
Notes:
1 Self-recorded tape means a cassette whose program
2 The TV program will not be recoded if RCA or 21pin
V: 2V/djv
3 The tracking control is enabled with the (])/([)
H: 50u sec/djv
29
Measuring Colour TV monitor
instrument
Mode Playback
Cassette Self-recorded tape
(SP/LP/EP mode)(See Note below)
Control Tracking control buttons (]) or ([)
Specification Minimized noise on
monitor screen
video signal to the VIDEO IN jack. (See note 2 below)
control and record the signal on tape.
above step.
playback the recorded portion in the slow mode.
front side on the main PWB.
Be sure that all the LCD display light up when press the
TEST mode.
TRACKING buttons until there is minimum or no noise
appear on the screen.
button again and make sure there is minimum or no
noise on the screen.(For the LP/EP mode there are the
same adjustmet as SP mode.)
was recorded by the unit being adjusted.
plugs are pluged in the AUDIO/VIDEO input terminals.
button.
VC-A310X/NZ
VC-H725X
VC-H730X/NZ