Service manual
29
VL-A111U/AH131U
VL-AH151U/AH161U
Figure 6.1.1
Figure 6.1.2
Mode Playback
Adjustment address 30h
Tape Alignment tape (JiGWR5-5NSP)
Oscilloscope
Measuring instrument
6-6-3-2. Head Switching Point Adjustment
1) Play back the alignment tape (JiGWR5-5NSP)
2) Press the “CONTINUE” key and “TEST SEL.” key on the
adjustment remote control to set the test mode.
(At this time the numeral of “T-01” blinks.)
3) Using the “FF” and “REW” keys, select “T-08”, and press
"PLAY" key to set the SW-P adjustment mode.
4) When the adjustment is completed, "HSWP" is displayed and the tape is ejected.
When the adjustment is not proper, "NG" is displayed in the red frame of the LCD.
6H
3H 3H
V sync signal
6H
3H 3H
V sync signal
4) Select the address 30h, set the sync slope of oscilloscope to (–),
and 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 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 “CONTINUE” key and “VTR ADJ” key on the adjustment remote control to set the VCR adjustment mode.
VTR ADJ 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)
VTR ADJ 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).
VTR ADJ 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)
VTR ADJ Mode Address Measuring point Adjustment standard Measuring instrument
REC C current
adjustment (Nor 8)
Oscilloscope
46
MP 120±5mVP-P
VCR
STOP
TL9413 (Sig)
TL9414 (Gnd)
2. C recording current adjustment
· Hi-8model (AH131U/AH151U/AH161U)
· Nor8model (VL-A111U)
· Nor8model (VL-A111U)
(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
6-6-3-3. Y/C recording current adjustment
1. Y recording current adjustment
· Hi-8model (AH131U/AH151U/AH161U)