Toshiba DVR610 Service Manual - Page 19

Electrical Adjustment Instructions - specs

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ELECTRICAL ADJUSTMENT INSTRUCTIONS NOTE: BOARD MEANS PRINTED CIRCUIT BOARD. 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 [TRACKING ] or [TRACKING ] button on the front panel first, then the [ O ] (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 (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. Figure 1 EXT. Syncronize Trigger Point CH1 CH2 1.0H 0.5H 6.5H±1H (416μs±64μs) Switching Pulse V-Sync Reference Notes: Playback the Alignment tape and adjust VR1501 so that the V-sync front edge of the CH1 video output waveform is at the 6.5H±1H (416μs±64μs) delayed position from the rising edge of the CH2 head switching pulse waveform. Test point Adj.Point Mode Input TP751(V-OUT) VR1501 TP302(RF-SW) (Switching Point) GND (BOARD MAIN) PLAY (SP) ----- Tape Measurement Equipment Spec. FL8A Oscilloscope 6.5H±1H (416μs±64μs) Connections of Measurement Equipment BOARD Main TP751 GND TP302 Oscilloscope CH1 CH2 Trig. (+) 1-7-1 E9KGAEA

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1-7-1
E9KGAEA
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 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 [TRACKING
]
or [TRACKING
] button on the front panel first,
then the [
O
] (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 (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.
Reference Notes:
Playback the Alignment tape and adjust VR1501 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 switch-
ing pulse waveform.
NOTE: BOARD MEANS PRINTED CIRCUIT BOARD.
Test point
Adj.Point
Mode
Input
TP751(V-OUT)
TP302(RF-SW)
GND
VR1501
(Switching Point)
(BOARD MAIN)
PLAY
(SP)
-----
Tape
Measurement
Equipment
Spec.
FL8A
Oscilloscope
6.5H
±
1H
(416
μ
s
±
64
μ
s)
Connections of Measurement Equipment
Oscilloscope
BOARD
Main
TP751
CH1
CH2
Trig. (+)
GND
TP302
Figure 1
EXT. Syncronize Trigger Point
CH1
CH2
1.0H
0.5H
V-Sync
Switching Pulse
6.5H
±
1H (416
μ
s
±
64
μ
s)