Werbung
Verfügbare Sprachen
Verfügbare Sprachen
SERVO CIRCUIT ADJUSTMENT
ADJUSTMENT OF HEAD SWITCHING POINT
Dual-trace oscilloscope
Colour TV monitor
Playback
Alignment tape (VROCPSV)
TP2202 (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)
1. Remove the front panel and play the alignment
tape. (VROCPSV)
(Playback picture on the monitor screen.)
2. Make
for a moment
short-circuit
between
TP5003 and TP5004 both located at the left on
your side on the main PWB.
Be sure that all the fluorescent display tubes
light up into the TEST mode. (See Note below)
3. Connect a dual-trace oscilloscope to the video
output terminal and TP2202 (CH-1 trigger slope
switch at (+), Internal trigger at CH-1 side.).
4. Obseve the waveform with an oscilloscope and
adjust the FF or REW
button so that the
specification.
5. Press the PLAY button in the return to normal
mode.
6. Make
this checking
of waveform
on
the
oscilloscope screen be as shown in Figure 5-2. just
after the head
switching
point have
been
adjusted.
Notes:
@® Set-up of TEST mode.
When the adjustment of HEAD
SWITCHING
POINT, AUTO TRACKING function is invalid.
@ When
the cassette
housing control
ass'y is
removed, set-up of mechanism operating mode.
1) Replug the AC power cord a few minute later.
2) Make a short-circuit between TP5001 (or jumper
pin 241) and TP5002 (or jumper pin 242) both
located at left on your side on the main PWB
with a 22 ohm resistor, to center the tracking.
3) AC power cord is plugged in.
4) You can make mechanism
operating
mode.
Replug the AC power cord a few minute later.
Measuring
instrument
Mode
Cassette
Test point
Specification
39
CH-1:1V/div 50ps/div
CH-2
:
CH-2:2V/div 50us/div
VIDEO OUT
ae
~<— 6.5+0.5H (lines) —————>! V-sync.
HEAD
1
SWITCHING
PULSE
Figure 5-2.
ADJUSTMENT OF SP/LP SLOW TRACKING
PRESET
Measuring
Colour TV monitor
instrument
Cassette
Self-recorded tape (SP/LP
mode)
(See Note below)
Control
Tracking control buttons (+) or
(-)
Specification
Minimized noise on monitor
screen
1. Have the unit to receive a good TV broadcast or
feed a video signal to the VIDEO IN jack. (See
note @ below)
2. Set the tape speed in SP mode by using the
remote control and record the signal ontape.
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 inthe slow
mode.
5. Make for a moment short circuited TP5003 and
TP5004 on the main PWB.
Make sure that all the fluorescent display tubes
light up into the TEST mode.
6. Look at the monitor screen and adjust the (+) or
(-) TRACKING buttons so that the there
is noise
disappears from the screen.
Werbung
