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3513J11(N)
2. ELECTRICAL ADJUSTMENT
L
2-1.
PREPARATION
2-1-1.
EQUIPMENT
Colour TV monitor
PAL Colour-bar generator (with RF and LINE OUTPUT)
PAL TV test signal generator
(Multi-burst
signal with
colour burst)
Audio signal generator
Oscilloscope (dual trace; frequency response: 10MHZ or
more; probe: 10:1 )
Frequency counter (countable to 10MHZ or higher)
Digital voltmeter
AC voltmeter
In/output
probes
Alignment cassette (VHJ-0008)
PAL Colour bar 1KHz
Alignment cassette (VHJ-0009)
Monoscope 6KHz
Alignment
cassette (VHJ-0023)
PAL Monoscope
6KHz,
PAL Colour-bar 1KHz, SECAM Colour-bar 1KHz, PAL RF
Sweep
MESECAM
Colour-bar
1KHz, NTSC Colour-bar
1KHz.
Alignment cassette (VHJ-0080)
PAL colour bar HiFi BPF
Alignment cassetee (VHJ-0020)
AF level colour bar 1KHz
Relay jig (VHJ-0067)
12-wire cable for Pre-amp unit
Connect the Flat cable end from the Drum assembly to the
Pre-amp unit using the Relay jig to provide simple repair-
ing and adjustment of the Pre-amp unit, as shown in Fig,
2-1-1. Further, when adjusting the Pre-amp unit, be sure
to make contact an end of Shield case with Bracket of the
Pre-amo unit to maintain the shield effect.
Relay jig (VHJ-0088)
22-wires
cable for AD-2 board
Connect the Flat cable end to CN251 of the CP-1 board
and other end to CN271 of the AD-2 board using the Relay
jig (Shown in Fig. 2-1 -2) to provide simple repairing and
adjustment of the AD-2 board.
%
Relay jig <
~"
{
'\
Flat cable
Slinder
&,
assembly
/
PlaJo35
@-a
I
1~
W
'Erracket
Fig. 2-1-1
RMJol 4
I
Fig. 2-1-2
L
2-1-2.
SET-UP
Because the RF input signal is used for circuit adjustments,
o Check to be sure that there is no spike noise in the sync
connect the colour-bar generator to the ANT IN terminal of
the VCR. The RF input signal is processed by the tuner and
IF circuit. It is important that the video output signal of the IF
circuit satisfies the items shown in Fig. 2-1-3. Connect the
oscilloscope to the VIDEO OUTPUT terminal of the video
circuit and terminate with a 75Q load, and then check the
video output signal.
s The amplitude
of the sync signal should be approxi-
mately 0.3 VP-P,
" The amplitude
of the video signal should be approxi-
mately 0.7 Vp-p.
" While observing the oscilloscope or TV screen, make
fine-tuning
adjustments
so that
the
colour
burst
amplitude is approximately 0.3 Vp-p.
part of the horizontal sync signal
100%
P
o.
-P
H sync si&al
Fig. 2-1-3
—2—
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