DV-NC55S/H
DV-NC60H
SERVO CIRCUIT ADJUSTMENT
ADJUSTMENT OF HEAD SWITCHING POINT
MeasuringDual-trace oscilloscopeCH-1: 1V/div 50?s/div
CH-2CH-2: 2V/div 50?s/div
instrumentColour TV monitor
VIDEO OUT
ModePlayback
CassetteAlignment tape (VROCPSV)
CH-16.5? 0.5H (lines)V-sync.
Test pointPin(2) of P201 (H.SW.P.) to CH-1,HEAD
SWITCHING
VIDEO OUT jack to CH-2PULSE
(CH-1 trigger slope switch at (+),
Internal trigger at CH-1 side.)Figure 9-2.
Specification?6.5 0.5H (lines)ADJUSTMENT OF PAL SYSTEM SP/LP/EP
SLOW TRACKING PRESET
1. Remove the front panel and play the alignment tape.
(VROCPSV)MeasuringColour TV monitor
2. Press the PLAY button.instrument
(Playback picture on the monitor screen.)
ModePlayback
3. Make for a moment short-circuit TP5101-TP5103,
located at the left side on the VCR display PWB.
CassetteSelf-recorded tape
Be sure that all the fluorescent display tubes light up(SP/LP/EP mode)(See Note below)
into the TEST mode.(See Note below)
Be sure the "PLAY" appears in the fluorescent displayControlTracking control buttons (+) or (�)
tubes flashing (about 1Hz) into the auto PG adjust-
SpecificationMinimized noise on
ment operating.
Note:monitor screen
When the manual PG adjustment, obseve the wave-1. Have the unit to receive a good TV broadcast or feed
form with an oscilloscope and make adjustment FF ora video signal to the VIDEO IN jack. (See note 2
REW button so that the specification.
below)
4. Stop the "PLAY" appears in the flashing of fluorescent2. Set the tape speed in SP mode by using the remote
display tubes at adjusted.control and record the signal on tape.
5. Press the STOP button in the return to normal mode.
3. Rewind and play the tape where signal was recorded
6. Make this checking of waveform on the oscilloscopein above step.
screen be as shown in Figure 9-2. just after the head4. Press the SLOW button on the remote control, and
switching point have been adjusted.
playback the recorded portion in the slow mode.
Note:
5. Make for a moment short-ciucuit TP5101-TP5103,
1 Set-up of TEST mode.located at the front side on the main PWB.
When the adjustment of HEAD SWITCHING POINT,
Be sure that all the fluorescent display tubes light up
AUTO TRACKING function is invalid.
into the TEST mode.
2 When the cassette housing control assOy is removed,6. Look at the monitor screen and adjust the (+) or (�)
set-up of mechanism operating mode.
TRACKING buttons so that the there is noise disap-
1) Replug the AC power cord it a few minutes later.
pears from the screen.
2) Make a short-circuit TP5102-TP5103 located at the7. Press the STOP button to return to normal mode.
front side on the main PWB, and press both tracking
8. Play the tape a few seconds then press the SLOW
control button at the same time to set the tracking in
button again and make sure there is on noise in the
center.screen.(For the LP/EP mode put adjustment at the
3) AC power cord is plugged in.
same adjustmet way as SP mode.)
4) You can mechanism operatig mode, Replug the AC
Notes:
power cord a few minutes later.1 Self-recorded tape means a cassette whose pro-
gram was recorded by the unit being adjusted.
2 The TV program will not be recorded if RCA or 21pin
plugs are pluged in to the AUDIO/VIDEO input
terminals.
39 |
ACEC
