DV-NC60H (serv.man10). Electrical adjustment - Sharp DVD Service Manual (repair manual)

Model
DV-NC60H (serv.man10)
Pages
3 Few pages! See other manuals at the bottom of the first or last page.
Size
28.24 KB
Type
PDF
Document
Service Manual
Brand
Device
DVD / Electrical adjustment
File
dv-nc60h-sm10.pdf
Date

View Sharp DV-NC60H (serv.man10) Service Manual online

38
DV-NC55S/H
DV-NC60H
9. ELECTRICAL ADJUSTMENT
Notes:
• Before the adjustment:
Electrical adjustments discussed here are often required after replacement of electronic components and mechanical
parts such as video heads.
Check that the mechanism and all electric components are in good working condition prior to the adjustments,
otherwise adjustments can not be completed.
• Instruments required:
Colour TV monitor
Dual-trace oscilloscope
         Alignment tape (VROCPSV)
Blank video cassette tape
DC voltmeter
Screwdriver for adjustment
Servicing precations
When the IC705 (E
2
PROM) has been replaced, make the following reprogramming. Depending on models, the IC705
(E
2
PROM) has been factry-adjusted for it’s memory function.
It’s therefore necessary to reprogram the memory function for the model in question.
Note that the servo circuit requires readjustments for the head switching point, slow and still modes.
• Location of controls and test points
Figure 9-1.
VCR Mechanism
DVD
POW
P201
TU1401
TP5102
TP5101
AV
TERMINAL
39
DV-NC55S/H
DV-NC60H
SERVO CIRCUIT ADJUSTMENT
ADJUSTMENT OF HEAD SWITCHING POINT
Measuring
instrument
Mode
Cassette
Dual-trace oscilloscope
Colour TV monitor
Playback
Alignment tape (VROCPSV)
Test point
Pin(2) of P201 (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.
(VROCPSV)
2. Press the PLAY button.
(Playback picture on the monitor screen.)
3. Make for a moment short-circuit TP5101-TP5103,
located at the left side on the VCR display PWB.
Be sure that all the fluorescent display tubes light up
into the TEST mode.(See Note below)
Be sure the "PLAY" appears in the fluorescent display
tubes flashing (about 1Hz) into the auto PG adjust-
ment operating.
Note:
When the manual PG adjustment, obseve the wave-
form with an oscilloscope and make adjustment FF or
REW button so that the specification.
4. Stop the "PLAY" appears in the flashing of fluorescent
display tubes at adjusted.
5. Press the STOP button in the return to normal mode.
6. Make this checking of waveform on the oscilloscope
screen be as shown in Figure 9-2. just after the head
switching point have been adjusted.
Note:
1
Set-up of TEST mode.
When the adjustment of HEAD SWITCHING POINT,
AUTO TRACKING function is invalid.
2
When the cassette housing control ass’y is removed,
set-up of mechanism operating mode.
1) Replug the AC power cord it a few minutes later.
2) Make a short-circuit TP5102-TP5103 located at the
front side on the main PWB, and press both tracking
control button at the same time to set the tracking in
center.
3) AC power cord is plugged in.
4) You can mechanism operatig mode, Replug the AC
power cord a few minutes later.
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
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-ciucuit  TP5101-TP5103,
located at the front side on the main PWB.
Be 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 disap-
pears from 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 on noise in the
screen.(For the LP/EP mode put adjustment at the
same adjustmet way as SP mode.)
Notes:
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.
6.5
±
0.5H (lines)
CH-1: 1V/div 50
µ
s/div
CH-2: 2V/div 50
µ
s/div
V-sync.
CH-1
HEAD
SWITCHING
PULSE
CH-2
VIDEO OUT
Figure 9-2.
40
DV-NC55S/H
DV-NC60H
Measuring
instrument
Mode
Cassette
Colour TV monitor
Playback still
Self-recorded tape (SP mode)
(See Note below 
2
)
Control
Tracking control buttons (+) or (–)
Specification
No vertical jitter of picture
ADJUSTMENT OF PAL SYSTEM FV(False
Vertical Sync) OF STILL 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/EP mode put adjustment at the
same adjustment way as SP mode.)
Note:
1
2
Self-recorded tape is a cassette whose program was
recorded by the unit being adjusted.
40
DV-NC55S/H
DV-NC60H
Measuring
instrument
Mode
Cassette
Colour TV monitor
Playback still
Self-recorded tape (SP mode)
(See Note below 
2
)
Control
Tracking control buttons (+) or (–)
Specification
No vertical jitter of picture
ADJUSTMENT OF PAL SYSTEM FV(False
Vertical Sync) OF STILL 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/EP mode put adjustment at the
same adjustment way as SP mode.)
Note:
1
2
Self-recorded tape is a cassette whose program was
recorded by the unit being adjusted.
40
DV-NC55S/H
DV-NC60H
Measuring
instrument
Mode
Cassette
Colour TV monitor
Playback still
Self-recorded tape (SP mode)
(See Note below 
2
)
Control
Tracking control buttons (+) or (–)
Specification
No vertical jitter of picture
ADJUSTMENT OF PAL SYSTEM FV(False
Vertical Sync) OF STILL 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/EP mode put adjustment at the
same adjustment way as SP mode.)
Note:
1
2
Self-recorded tape is a cassette whose program was
recorded by the unit being adjusted.
40
DV-NC55S/H
DV-NC60H
Measuring
instrument
Mode
Cassette
Colour TV monitor
Playback still
Self-recorded tape (SP mode)
(See Note below 
2
)
Control
Tracking control buttons (+) or (–)
Specification
No vertical jitter of picture
ADJUSTMENT OF PAL SYSTEM FV(False
Vertical Sync) OF STILL 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/EP mode put adjustment at the
same adjustment way as SP mode.)
Note:
1
2
Self-recorded tape is a cassette whose program was
recorded by the unit being adjusted.
40
DV-NC55S/H
DV-NC60H
Measuring
instrument
Mode
Cassette
Colour TV monitor
Playback still
Self-recorded tape (SP mode)
(See Note below 
2
)
Control
Tracking control buttons (+) or (–)
Specification
No vertical jitter of picture
ADJUSTMENT OF PAL SYSTEM FV(False
Vertical Sync) OF STILL 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/EP mode put adjustment at the
same adjustment way as SP mode.)
Note:
1
2
Self-recorded tape is a cassette whose program was
recorded by the unit being adjusted.
40
DV-NC55S/H
DV-NC60H
Measuring
instrument
Mode
Cassette
Colour TV monitor
Playback still
Self-recorded tape (SP mode)
(See Note below 
2
)
Control
Tracking control buttons (+) or (–)
Specification
No vertical jitter of picture
ADJUSTMENT OF PAL SYSTEM FV(False
Vertical Sync) OF STILL 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/EP mode put adjustment at the
same adjustment way as SP mode.)
Note:
1
2
Self-recorded tape is a cassette whose program was
recorded by the unit being adjusted.
40
DV-NC55S/H
DV-NC60H
Measuring
instrument
Mode
Cassette
Colour TV monitor
Playback still
Self-recorded tape (SP mode)
(See Note below 
2
)
Control
Tracking control buttons (+) or (–)
Specification
No vertical jitter of picture
ADJUSTMENT OF PAL SYSTEM FV(False
Vertical Sync) OF STILL 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/EP mode put adjustment at the
same adjustment way as SP mode.)
Note:
1
2
Self-recorded tape is a cassette whose program was
recorded by the unit being adjusted.
40
DV-NC55S/H
DV-NC60H
Measuring
instrument
Mode
Cassette
Colour TV monitor
Playback still
Self-recorded tape (SP mode)
(See Note below 
2
)
Control
Tracking control buttons (+) or (–)
Specification
No vertical jitter of picture
ADJUSTMENT OF PAL SYSTEM FV(False
Vertical Sync) OF STILL 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/EP mode put adjustment at the
same adjustment way as SP mode.)
Note:
1
2
Self-recorded tape is a cassette whose program was
recorded by the unit being adjusted.

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