Electrical Adjustment Procedures - Panasonic NV-HS1000 Service Manual

2-5. ELECTRICAL ADJUSTJVIENT
PROCEDURES
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This section provides complete adjustment procedures
required for electric circuits of VHS Video Cassette
Recorders.
2-5-1. TEST EQUIPMENT
To perform electrical adjustments following equipment is
required.
1. Dual-Trace Oscilloscope. (More than 35 MHz)
Voltage Range: 0.005-5V/div
Frequency Range: DC-35 MHz
Probes: 10:1 OR 1 :1
2. Frequency Counter.
Frequency Range: 0-10MHz
Probes: 1 :1
3. Universal Counter.
4. Digital Volt Meter. (D.V.M.)
5. Video Sweep Generator.
6. Sine Wave Generator.
7. Video Pattern Generator.
8. VHS Alignment Tape. (VFJ8125H3F)
9. VHS Blank Tape.
10. Monitor.
11. Plastic Tip Driver.
12. DC Power Supply.
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2-5-2. PREPARATION
During adjustment, set each selector as follows: when no
indication in the procedure .
NORMAL/Y/C/TEST SIGNAL SW (REAR) ... NORMAL
VIDEO MODE SW ........................................ AUTO
AI SW ............................................................ ON
EDIT MODE SW ........................................... RECORDER
HI Fl/NORMAL MIX SW ................................ OFF
PICTURE VR ................................................ CENTRE FIX
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HIFI REC LEVEL VR .................................... CENTRE FIX
CHANNEL. .................................................... A1/A2/A3
(Set to signal input terminal number)
TBC SW ........................................................ OFF
16:9 SW ........................................................ AUTO
AV3 INPUT SELECT SW ............................. S-VIDEO/LINE
(Set to signal input terminal)
S-VHS SW .................................................... ON
MONO SW (NV-HS1 000EC) ........................ OFF
NICAM/MONO SW (NV-HS10008) .............. NICAM
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2-5-3. HOW TO READ ADJUSTMENT PROCEDURES
Connecting Point
(Test Point) of
Measuring
Equipment
Adjustment
Component
\I \/
TP ADJ.
TP2001
R2002
TP2002
TAPE M. EQ.
ALIGNMENT
OSCILLO-
TAPE
SCOPE
VFJ8125H3F
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/\
Measuring
Equipment
Tape for the adjustment
Example: Alignment tape (VFJ8125H3F)
DELAY MODE
TP2001
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: -E- -T--➔v
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TP2002
CONNECTION
POINT OF A
SCOPE
2-7
Mode of VTR
Example: SELF RECORDING
Recorded the Video Signal
and Play Back the just
recorded portion
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Supply a Video
Signal to the VIDEO
INPUT on the rear
panel or tune in a
local on-air
1
�I
MODE INPUT
SELF VIDEO
RECORDING SIGNAL
SPEC .
0.4+-0.4 msec
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Specification
for Adjustment
Fig. E1
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I .
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TP2001 (TRIGGER)
TP2002
TRIGGER
CHANNEL OF
A SCOPE
Fig. E2
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