14VT-N10T(S)
ADJUSTMENT OF THE VCR ELECTRICAL CIRCUITRY
Notes:
? Before the adjustment:
Electrical adjustments described here are often required after replacement of electronic components and mechanical
parts such as video heads.
Check that the mechanism and all electric components are in good working condition prior to the adjustments,
otherwise adjustments can not be completed.
? Instruments required:
Dual-trace oscilloscope
Blank video cassette tape
Screwdriver for adjustment
Color bar generator
DC voltmeter
Alignment tape (VROATSV), (VRONBZGS)
? Adjustment of the VCR should be done in the TV/VCR combinated style. But there is a function to cut off the high
voltage of TV. Namely, you can check only VCR part by taking the wire lead OR . Therefore you can use function on
the occasion of checking and adjusting VCR part.
CH-1CH-1:1V/div 50?sec/div
SERVO CIRCUIT ADJUSTMENT
VIDEO OUTCH-2:2V/div 50?sec/div
ADJUSTMENT OF HEAD SWITCH-
ING POINT
MeasuringDual-trace oscilloscope5.5?0.5H(Iines)V-sync.
CH-2
instrumentHEAD
SWITCHING
ModePlayback
PULSE
CassetteAlignment tape (VROATSV)
Figure 2-1.
Test pointTP2201 (Video Out) to CH1
Notes:
TP3302 (Trigger) to CH21 To make this adjustment, disable the AUTO
ControlRemote ControlTRACKING function.
? The AUTO TRACKING function is disable in the
Specification5.5 ? 0.5H (lines)following cases. (In the playback mode only.)
a When the CH " (TR ) button and the "0" button
1. Play the alignment tape.(VROATSV.)
of the remote control are pressed at the same time.
2. Press the CH " (TR ) button and the "0" button of
b When the AC cord is plugged in with making
remote control at the same time to turn the set into
TP7701 and TP7702 short circuited, after the
the adjustment mode for head switching point and to
cassette housing control ass'y is removed.
set the tracking to center. (See Notes below) "T" is
(Mechanism operating mode)
displayed on the TV screen.
? The AUTO TRACKING function becomes available
3. Press the PLAY button of remote control to make the
in the following cases.
adjustment of head switching point, then the leading
a When the CH ' (TR?) button and the CH"
edge of the head switching pulse is automatically set
(TR ) button of the remote control are pressed
5.5H (lines) ahead of the vertical sync as shown
at the same time.
Figure 2-1 and the adjustment data is memorized in
b When the AC cord is plugged in with the cassette
2
the EP-ROM IC.
housing control ass'y put back.
4. Then press the stop button to stop the tape.
2 Pressing both the CH " (TR ) and the "0" button
transmits the test code. When the unit receives this
test code in the playback mode, the unit is turned
into the adjustment mode for the head switching point
and "T" is displayed at the position of CH number on
the screen. This function is available to the remote
control RRMCG1363PESB.
38 |
ACEC
SHARP
