1-7-1
E9TK0EA
ELECTRICAL ADJUSTMENT INSTRUCTIONS
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
completed. Also, do not attempt these adjustments
unless the proper equipment is available.
2. To perform these alignment / confirmation
procedures, make sure that the tracking control is
set in the center position: Press either [PROGRAM
5??
] or [PROGRAM
] button on the front panel
first, then the [
B
] (VCR) 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
waveform 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.
NOTE: BOARD MEANS PRINTED CIRCUIT BOARD.
Test point
Adj.Point
Mode
Input
J171(V-OUT)
TP504(RF-SW)
GND
VR501
(Switching Point)
(BOARD AV)
PLAY
(SP)
-----
Tape
Measurement
Equipment
Spec.
FL6A
Oscilloscope
6.5H
±
1H
(416
μ
s
±
64
μ
s)
Connections of Measurement Equipment
Oscilloscope
BOARD
AV
J171
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 DVR19DTKB2
Page 4: ...1 1 1 E9TK3SP SPECIFICATIONS ...
Page 58: ...1 14 3 NOTE BOARD MEANS PRINTED CIRCUIT BOARD E9TK3SCAV1 AV 1 9 Schematic Diagram VCR Section ...
Page 60: ...1 14 5 NOTE BOARD MEANS PRINTED CIRCUIT BOARD E9TK3SCAV3 AV 3 9 Schematic Diagram VCR Section ...
Page 61: ...1 14 6 NOTE BOARD MEANS PRINTED CIRCUIT BOARD E9TK3SCAV4 AV 4 9 Schematic Diagram VCR Section ...
Page 62: ...1 14 7 NOTE BOARD MEANS PRINTED CIRCUIT BOARD E9TK3SCAV5 AV 5 9 Schematic Diagram VCR Section ...
Page 63: ...1 14 8 NOTE BOARD MEANS PRINTED CIRCUIT BOARD E9TK3SCAV6 AV 6 9 Schematic Diagram VCR Section ...
Page 64: ...1 14 9 NOTE BOARD MEANS PRINTED CIRCUIT BOARD E9TK3SCAV7 AV 7 9 Schematic Diagram VCR Section ...
Page 89: ...1 17 3 DVDP_TI Push close 0 08 V 0 02 s Push Close detection Threshold level ...
Page 97: ...1 20 4 E9TK3PEX Packing X 2 X 3 X 6 X1 Upper Side Lower Side FRONT ...
Page 123: ......