1-7-1
H9710EA
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note: "CBA" is an abbreviation for
"Circuit Board Assembly."
NOTE:
1.Electrical adjustments are required after replacing
circuit components and certain mechanical parts.
It is important to do these adjustments only after
all repairs and replacements have been com-
pleted. Also, do not attempt these adjustments
unless the proper equipment is available.
2.To perform these alignment / confirmation proce-
dures, make sure that the tracking control is set in
the center position: Press either "PROG.
L5??
" or
"PROG.
K
" button on the front panel first, then the
"PLAY" button on the front panel.
Test Equipment Required
1.Oscilloscope: Dual-trace with 10:1 probe,
V-Range: 0.001~50V/Div.,
F-Range: DC~AC-20MHz
2.Alignment Tape (FL6A)
Head Switching Position Adjustment
Purpose:
To determine the Head Switching position during
playback.
Symptom of Misadjustment:
May cause Head Switching noise or vertical jitter
in the picture.
Reference Notes:
Playback the Alignment tape and adjust VR501 so that
the V-sync front edge of the CH1 video output wave-
form is at the 6.5H
±
1H (416
µ
s
±
64
µ
s) delayed position
from the rising edge of the CH2 head switching pulse
waveform.
Test point
Adj.Point
Mode
Input
J236(JK1-V-OUT)
TP504(RF-SW)
GND
VR501
(Switching Point)
(MAIN CBA)
PLAY
(SP)
-----
Tape
Measurement
Equipment
Spec.
FL6A
Oscilloscope
6.5H
±
1H
(416
µ
s
±
64
µ
s)
Connections of Measurement Equipment
Oscilloscope
Main CBA
TP751
CH1 CH2
Trig. (+)
GND
TP504
Figure 1
EXT. Syncronize Trigger Point
1.0H
CH1
CH2
Switching Pulse
V-Sync
0.5H
6.5H
±
1H (416
µ
s
±
64
µ
s)
Summary of Contents for DRV-A2635
Page 37: ...1 12 3 E9709SCM1 Main 1 9 Schematic Diagram VCR Section...
Page 39: ...1 12 5 E9709SCM3 Main 3 9 Schematic Diagram VCR Section...
Page 40: ...1 12 6 E9709SCM4 Main 4 9 Schematic Diagram VCR Section...
Page 41: ...1 12 7 E9709SCM5 Main 5 9 Schematic Diagram VCR Section...
Page 42: ...1 12 8 E9709SCM6 Main 6 9 Front Jack Schematic Diagram VCR Section...
Page 43: ...1 12 9 E9709SCM7 Main 7 9 Schematic Diagram VCR Section...
Page 44: ...1 12 10 E9709SCM8 Main 8 9 Schematic Diagram VCR Section...
Page 45: ...1 12 11 E9709SCM9 Main 9 9 Schematic Diagram VCR Section...
Page 47: ...1 12 13 E9709SCRJ Rear Jack Schematic Diagram VCR Section...
Page 48: ...1 12 14 E9709SCAFV AFV Schematic Diagram VCR Section...
Page 49: ...1 12 15 E9709SCD1 DVD Main 1 6 Schematic Diagram DVD Section...
Page 50: ...1 12 16 E9709SCD2 DVD Main 2 6 Schematic Diagram DVD Section...
Page 51: ...1 12 17 E9709SCD3 DVD Main 3 6 Schematic Diagram DVD Section...
Page 85: ...DRV D2831 E9709ED 2005 10 27...
