MECHANISM ADJUSTMENT
B. Confirm that the tape passes smoothly betweenpost, then slowly turn the tilt adjustment in the
the T/UP guide and the Pinch Roller (Using acounterclockwise direction to eliminate the tape
curling.
mirror or the naked eye).
1) After completing step A. (Preliminary Adjustment), check
that the tape passes around the T/UP post without foldingC. RF Fine Adjustment (only if the RF waveform
at the top or bottom.differs from figure C-5-3).
If folding is observed, due the following:
1) Check the RF Envelope after confirming smooth tape
a. If folding is observed at the lower part of the T/UP
transport path at the T/UP Guide/Pinch Roller.
post, then slowly turn the tilt adjustment in the
clockwise direction to eliminate tape the curling.
b. If folding is observed at the upper part of the T/UP
D. Precise Adjustment (Azimuth adjustment)
Test EquipmentTest Conditions
Test Equipment / FixtureAdjustment Points
Connection PointVCR (VCP) State
* Oscilloscope* Audio output jack*Play an alignment tape* Azimuth Adjustment Screw(A)
* Alignment tapes1KHz, 7KHz sections.* Tilt Adjustment Screw(C)
* Screw Driver(+) Type 5mm
Adjustment Procedure1KHZ7KHZ
1) Connect the probe of oscilloscope to Audio Output Jack.
2) Alternately adjust the Azimuth adjustment screw(A) and
the Tilt adjustment screw(C) for maximum output of the
1KHz and 7KHz segments, while maintaining the flattest
A: Maximum B: Maximum
envelope differential between the two frequencies.
Fig. C-6-4
7. X-Value Adjustment
Purpose : To obtain compatibility with other VCR(VCP).
Test EquipmentTest Conditions
Test Equipment / FixtureAdjustment diagrams
Connection PointVCR (VCP) State
* Oscilloscope*CH-1: PB RF Envelope* Play an alignment tape
* Alignment tapes*CH-2: NTSC: SW 30Hz
LeftGroove at the
* Screw Driver(+) Type 5mmPAL : SW 25Hz
Base A/C
* Post Height Adjusting*Head Switching Output
DriverTest Point
*RF Envelope Output Test Right
Point
3mm Hole
Adjustment ProcedureAdjustment Diagram
X value Adjustment
1) Loosen the fixed mounting and X Value adjustmentScrew(X)
screw.Azimuth
2) Allow the mechanism to run long enough for autoAdjustment
tracking to complete it's cycle.Screw(A)
Tilt
3) Move the A/C base laterally in the direction as shown
Adjustment
in the diagram to find the center of the peak thatScrew(C)Turning
allows for the maximum waveform envelope. ThisHeightCenter
method should allow the 30um head to be centrallyAdjustmentFixed
located over the 60um tape track.Screw(B)Fig. C-7
4) Tighten the A/C head assembly mounting screws.
Connection DiagramOSCILLOSCOPE
RF ENVELOPE OUTPUT TEST POINT
CH-1 CH-2
HEAD SWITCHING OUTPUT TEST
POINT
4-21 |
ACEC
LG-GOLDSTAR
