1-7-1
E9C80EA
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note: “CBA” is 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
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 [CHANNEL
L
] or [CHANNEL
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: 0.001~50 V/Div.,
F-Range: DC~AC-20 MHz
2. Alignment Tape (FL8A)
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.
Note:
TP751(V-OUT),
TP302(RF-SW),
VR1501(Switching Point) --- Main CBA
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 (412.7
µ
s ± 63.5
µ
s)
delayed position from the rising edge of the CH2 head
switching pulse waveform.
Test point
Adj. Point
Mode
Input
TP751(V-OUT)
TP302(RF-SW)
GND
VR1501
(Switching Point)
PLAY
(SP)
-----
Tape
Measurement
Equipment
Spec.
FL8A
Oscilloscope
6.5H ± 1H
(412.7
µ
s±63.5
µ
s)
Connections of Measurement Equipment
Figure 1
Oscilloscope
Main CBA
TP751
CH1 CH2
Trig. (+)
GND
TP302
EXT. Syncronize Trigger Point
1.0H
CH1
CH2
Switching Pulse
V-Sync
0.5H
6.5H
±
1H (412.7
µ
s
±
63.5
µ
s)
Summary of Contents for ZV450TT8
Page 19: ...1 6 6 E9H11DC Fig D10 23 Deck Pedestal 24 Front Bracket R S 21 S 21 S 21 S 21 S 22 ...
Page 41: ...1 12 3 Main 1 8 Schematic Diagram E9H11SCM1 ...
Page 43: ...1 12 5 Main 3 8 Schematic Diagram E9H11SCM3 ...
Page 44: ...1 12 6 Main 4 8 Schematic Diagram E9H11SCM4 ...
Page 45: ...1 12 7 Main 5 8 Schematic Diagram E9H11SCM5 ...
Page 46: ...1 12 8 Main 6 8 Schematic Diagram E9H11SCM6 ...
Page 47: ...1 12 9 Main 7 8 Schematic Diagram E9H11SCM7 ...
Page 48: ...1 12 10 Main 8 8 Schematic Diagram E9H11SCM8 ...
Page 50: ...1 12 12 Front Jack Schematic Diagram E9H11SCFJ ...
Page 57: ...1 12 19 DTV Module 1 2 Schematic Diagram E9H11SCDTV1 ...
Page 58: ...1 12 20 DTV Module 2 2 Schematic Diagram E9H11SCDTV2 ...
Page 63: ...1 12 25 BE9C80F01032A Tuner CBA Top View ...
Page 71: ...1 15 3 R4NTI Push close 0 08 V 0 02 s Push Close detection Threshold level ...
