13VT-L100/150
13VT-CL10
ADJUSTMENT OF THE VCR ELECTRICAL CIRCUITRY
Notes:
E 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.
E Instruments required:
Dual-trace oscilloscope
Blank video cassette tape
Screwdriver for adjustment
Color bar generator
DC voltmeter
Alignment tape (VROATSV), (VROBBZGS)
E 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 socket of K710 off P708 in PWB-A. Therefore
you can use function on the occasion of checking and adjusting VCR part.
CH-1CH-1:1V/div 50Esec/div
SERVO CIRCUIT ADJUSTMENT
VIDEO OUTCH-2:2V/div 50Esec/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
TP3302 (Trigger) to CH2Notes:
1 To make this adjustment, disable the AUTO
ControlRemote Control
TRACKING function.
Specification5.5 ? 0.5H (lines)E The AUTO TRACKING function is disable in the
following cases. (In the playback mode only.)
1. Play the alignment tape.(VROATSV.)a When the CH " (TR N) button and the "0" button
2. Press the CH " (TR N) button and the "0" button ofof the remote control are pressed at the same time.
remote control at the same time to turn the set intob When the AC cord is plugged in with making
the adjustment mode for head switching point and toTP7701 and TP7702 short circuited, after the
set the tracking to center. (See Notes below) "T" iscassette housing control ass'y is removed.
displayed on the TV screen.(Mechanism operating mode)
3. Press the PLAY button of remote control to makEe theThe AUTO TRACKING function becomes available
adjustment of head switching point, then the leadingin the following cases.
edge of the head switching pulse is automatically seta When the CH ' (TR?) button and the CH"
5.5H (lines) ahead of the vertical sync as shown(TR N) button of the remote control are pressed
Figure 2-1 and the adjustment data is memorized inat the same time.
2
the EP-ROM IC.b When the AC cord is plugged in with the cassette
4. Then press the stop button to stop the tape.housing control ass'y put back.
2 Pressing both the CH " (TR N) and the "0" button
transmits the test code. When the unit receives this
test code in the playback mode, "T" is displayed at
the position of CH number on the screen. This
function is available to the remote controls
RRMCG1330PESA/SB.
40 |
ACEC
SHARP
