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2-5. ELECTRICAL ADJUSTJVIENT
PROCEDURES
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.
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
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
2-5-3. HOW TO READ ADJUSTMENT PROCEDURES
2-7
Mode of VTR
Connecting Point
Example: SELF RECORDING
(Test Point) of
Recorded the Video Signal
Measuring
and Play Back the just
Equipment
recorded portion
Supply a Video
Adjustment
I
Signal to the VIDEO
Component
INPUT on the rear
panel or tune in a
local on-air
\I
\/
�I
1
TP
ADJ.
MODE
INPUT
TP2001
R2002
SELF
VIDEO
TP2002
RECORDING SIGNAL
TAPE
M. EQ.
SPEC.
ALIGNMENT OSCILLO-
TAPE
0.4+-0.4msec
VFJ8125H3F SCOPE
/\
i
i
Measuring
I
Specification
I
Equipment
for Adjustment
Tape for the adjustment
Example: Alignment tape (VFJ8125H3F)
DELAY MODE
TP2001
TP2002
CONNECTION
POINT OF A
SCOPE
I
I
I
Fig. E1
I
I
:-E--T--➔v
I
I .
I
TP2001 (TRIGGER)
TP2002
Fig. E2
TRIGGER
CHANNEL OF
A SCOPE
Содержание NV-HS1000
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