Panasonic AG-6124 Service Manual page 26

CLOVINIVAL AVUJUSIMENI
ELECTRICAL ADJUSTMENT PROCEDURES
4-1. TEST EQUIPMENT
To perform the electrical adjustment completely the
following equipments are required.
1. VTVM (Vacuum Tube Volt Meter)
Capacity: 0.001 to 50V
2. DVM (Digital Volt Meter)
Capacity: 0.001 to 50V
3. Dual-Trace Oscilloscope (with probes)
Capacity: 0.005 to 50V/div, DC to 30MHz
4, Frequency Counter
Capacity: 0 to 10MHz
5. Sine Wave Signal Generator(RC Oscillator)
Capacity: 0 to 10MHz
Video Signal Generator (Composite)
Spectrum analyzer
Color Monitor TV
Alignment Tape (VF M8080HQFP)
4-2. ELECTRICAL ADJUSTMENT
PROCEDURES
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HOW TO READ THE ADJUSTMENT
PROCEDURE TABLE
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BOARD: Adjustment position of Print Circuit Board.
TP: Connection point(Test Point) of measuring
equipment
* (_) shown TP location on the.board.
ADJ.: Adjustment component
* (_) shown VR location the board.
TAPE: Tape for adjustment.
INPUT: Supply a signal for adjustment.
MODE: Mode of VTR.
Example:REC — PLAY is recording signal
and playback the portion just recorded.
M.EQ: Measuring equipment.
SPEC: Specification for adjustment.
4-2-1. PG SHIFTER ADu.
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| MEQ OSCILLOSCOPE
Note: Tape interchangeability adjustment should be
completed before this adjustment.
1. Playback the 2nd portion of the alignment tape.
2. Connect the oscilloscope to TP3502 for CH1 and
TP6106 for CH2.
3. Adjust VR2002 so that T=6.5 + 0.5H as shown in
Fig. E1.
TP3502
(HEAD SW) |
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TP6105
Fig.E1
4-2-2. SLOW FREE RUN ADJ.
BOARD MAIN C.B.A.
TPeoDa(a
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PLAY/PAUSE(STILL)
| MEQ — | FREQUENCY COUNTER
1. Connect the jumper wire between TP6002(B-8)
and TP6003(B-8) on the MAIN C.B.A.
2. Playback the 2nd portion of the alignment tape.
3. Connect the low frequency counter to TP6O04.
4. Adjust VR2001 so that F=470 + 10Hz.
5. Remove a jumper wire when completed this
adjustment.