Sharp VL-A10K, Service Manual

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VL-A10U/UC/UA/UW/T/K
VL-AH30U/UC/T
Figure 6.1.1 Figure 6.1.2
Mode Playback
Adjustment address 30h
Tape Alignment tape (JiGWR5-5NSP)
Oscilloscope Measuring instrument
6-3-4. Adjustment of system controller and servo circuit
6-3-4-1. Adjustment of playback switching point
b) CHARGING CIRCUIT ADJUSTMENT PROCEDURE
1) Play back the alignment tape (JiGWR5-5NSP)
2) Press the “CONTINUOUS PUSH” and “TEST MODE SELEC-
TION” of adjustment remote controller to set the test mode.
(At this time the numeral of “TEST01” blinks.)
3) Using the “FF” and “REW” keys, select “TEST08”, and press the playback key to set the SW-P adjustment mode.
4) After a while the adjustment is completed, and operation stops automatically.
In case of adjustment failure the tape is ejected automatically.
6H
3H 3H
V sync signal
6H
3H 3H
V sync signal
4) Select the address 30h, set the sync slope of oscilloscope to (–),
adjust the data with “REW” and “FF” so that the interval between
the trigger point and the V sync signal is set to 6H, and fix the data
with the “PLAY” button. (See Figure 6.1.1.)
5) Then, set the sync slope to (+), and ascertain that the interval
between the trigger point and the V sync signal has been set to 6H.
(See Figure 6.1.2.)
6) Keep the STOP key pressed for about 3 seconds to exit from the
adjustment mode.
Only in the case when the satisfactory result was not obtained by the adjusting method described above, perform the following
adjustment.
1) Connect each signal to the oscilloscope.
1ch: SEP Y OUT ...... TL1453
2ch: H-SW-P ............ TL7417
GND: GND ................. TL1454
2) Play back the alignment tape (JiGWR5-5NSP)
3) Press the “CONTINUOUS PUSH” and “VCR ADJUSTMENT” of adjustment remote controller to set the VCR adjustment mode.
Mode Address Measuring point Adjustment standard Measuring instrument
3F ME 130
±
5mVP-P
40 MP 95
±
5mVP-P
41 ME 125
±
5mVP-P
42 MP 120
±
5mVP-P
REC Y current
adjustment (Hi-8)
REC Y current
adjustment (Nor 8)
VCR
STOP
Oscilloscope
TL9413(Sig)
TL9414(Gnd)
Mode Address Measuring point Adjustment standard Measuring instrument
REC Y current
adjustment (Nor 8)
Oscilloscope
42
MP 120
±
5mVP-P
VCR
STOP
TL9413(Sig)
TL9414(Gnd)
(1) Enter the VCR STOP mode.
(2) Select the above applicable address with the adjustment remote control.
(3) Measurement signal is output to TL9413.
(4) Adjust the amplitude so as to get the adjustment standard value at TL9413(Sig) and TL9414(Gnd).
Mode Address Measuring point Adjustment standard Measuring instrument
43 ME 115
±
5mVP-P
44 MP 105
±
5mVP-P
45 ME 135
±
5mVP-P
46 MP 120
±
5mVP-P
REC C current
adjustment (Hi-8)
REC C current
adjustment (Nor 8)
VCR
STOP
Oscilloscope
TL9413 (Sig)
TL9414 (Gnd)
Mode Address Measuring point Adjustment standard Measuring instrument
REC Y current
adjustment (Nor 8)
Oscilloscope 42 MP 120
±
5mVP-P
VCR
STOP
TL9413 (Sig)
TL9414 (Gnd)
2. C recording current adjustment
· Hi-8model (VL-AH30U Series)
· Nor8model (VL-A10U Series)
· Nor8model (VL-A10U Series)
6-3-5. Y/C circuit adjustment method
1. Y recording current adjustment
· Hi-8model (VL-AH30U Series)
(1) Enter the VCR STOP mode.
(2) Select the above applicable address with the adjustment remote control.
(3) Measurement signal is output to TL9413.
(4) Adjust the amplitude so as to get the adjustment standard value at TL9413(Sig) and TL9414(Gnd).
Standard value
Standard value