28
VC-AA350A/L/M/W
VC-AA352W,AA360A,AA370A
VC-AA550A/L/W,AA560A,AA570A
Measuring
instrument
Mode
Cassette
Dual-trace oscilloscope
Colour TV monitor
Playback
Alignment tape
MODEL
Alignment tape
AA370
VROCBZF
AA350/352/350
VROBBZG
AA550/560/570
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.)
Specification
6.5
±
0.5H (lines)
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.
SERVO CIRCUIT ADJUSTMENT
ADJUSTMENT OF HEAD SWITCHING POINT
ADJUSTMENT OF PAL SYSTEM SP/LP/EP
SLOW TRACKING PRESET
1. Have the unit to receive a good TV broadcast or feed a
video signal to the VIDEO IN jack. (See note
2
below)
2. Set the tape speed in SP mode by using the remote
control and record the signal on tape.
3. Rewind and play the tape where signal was recorded in
above step.
4. Press the SLOW button on the remote control, and
playback the recorded portion in the slow mode.
5. Make for a moment short-circuit TP801, located at the
front side on the main PWB.
Be sure that all the LCD display light up when press the
TEST mode.
6. Look at the monitor screen and adjust the (
]
) or (
[
)
TRACKING buttons until there is minimum or no noise
appear on the screen.
7. Press the STOP button to return to normal mode.
8. Play the tape a few seconds then press the SLOW
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.)
Notes:
1
Self-recorded tape means a cassette whose program
was recorded by the unit being adjusted.
2
The TV program will not be recoded if RCA or 21pin
plugs are pluged in the AUDIO/VIDEO input terminals.
3
The tracking control is enabled with the (
]
)/(
[
)
button.
Measuring
instrument
Mode
Cassette
Colour TV monitor
Playback
Self-recorded tape
(SP/LP/EP mode)(See Note below)
Control
Tracking control buttons (
]
) or (
[
)
Specification
Minimized noise on
monitor screen
CH-1
HEAD
SWITCHING
PULSE
CH-2
Video signal
6.5
±
0.5H
TRIG INT CH-1
H: 50u sec/djv
V: 2V/djv
Figure 5-2.
Note:
1
For model VC-AA350, VC-AA352W and VC-AA360,
the following adjustment shall be made for LP/EP
mode. For SP mode ignore.
2
For model VC-AA370, the following adjustment shall
be made only for SP mode due to don't have LP/EP
mode.
