1-6-1
FEGVCREA
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 "CHANNEL
L5??
" or
"CHANNEL
K
" button on the remote control unit
first, then the "PLAY" button (Front Panel only).
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
J23(V-OUT)
TP502(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
Figure 1
Oscilloscope
Main CBA
J23
CH1 CH2
Trig. (+)
GND
TP502
EXT. Syncronize Trigger Point
1.0H
CH1
CH2
Switching Pulse
6.5H+/-1H (416
µ
s+/-64
µ
s)
V-Sync
0.5H
Summary of Contents for VC4006F
Page 24: ...1 10 3 HM320SCM1 Main 1 6 Schematic Diagram...
Page 25: ...1 10 4 HM320SCM2 Main 2 6 Sensor Schematic Diagram...
Page 26: ...1 10 5 HM320SCM3 Main 3 6 Schematic Diagram...
Page 27: ...1 10 6 HM320SCM4 Main 4 6 Jack Schematic Diagram...
Page 29: ...1 10 8 HM320SCM6 Main 6 6 Schematic Diagram...
Page 32: ...1 10 11 BHM450F01011C Jack CBA Top View Jack CBA Bottom View...
Page 38: ...1 15 1 HM320FEX EXPLODED VIEWS Front Panel A1X...
Page 50: ...VC4006F HM320FD 2006 05 24...
