I
31C0.J1l(N)
2. ELECTRICAL ADJUSTMENT
2-1. PREPARATION
2-1-1. EQUIPMENT
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Colour TV monitor
PAL Colour-bar generator (with RF and LINE OUTPUT)
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-0051 ) Check for D.O.C.
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.
Relay jig (VHJ-0065) 5-wire cable for Pre-amp unit
Relay jig (VHJ-0084) for CP-1 and CP-2 board
Relay jig (VHJ-0085) for Video pre-amp unit
2-1-2. CONNECTING THE RELAY JIG
When repairing CP-1 and CP-2 board
(see Figs. 2-1-2 and 2-1 -3)
NOTE: The connection of any Relay jigs can be done
1.
2.
3.
4.
without removing the front panel of the main unit.
Remove the seven screws of the CP-I board to take out
with CP-2 board connected.
Insert the CP-1 board with CP-2 board connected in the
slit of chassis as shown in Fig.
2-1-3(right).
Connect CNO1 and CN02 of Relay jig (VHJ-0084) into
connectors of the PW-1 board and the Pre-amp unit, in the
direction of arrow as shown in Fig. 2-1-3 (left). Fix the
relay jig with screw if necessary.
Connect 12-pin, 8-pin and 4-pin connectors of the Relay
jig to connectors CN541, CN101 and CN201 on the CP-1
board, respectively.
5. Connect connector (1) from ACE head to CN06 of the
Relay jig (VHJ-0084).
6. After finishing the repairs and adjustments, put the Flat
cables back to its former position.
When repairing the Pre-amp unit
(see Figs. 2-1-1 and 2-1 -4)
1.
2.
3.
Remove the Pre-amp unit from the chassis, connect
Relay jig (VHJ-0065) between the Pre-amp unit and
drum assembly.
Connect Relay jig (VHJ-0084) excepting 8-pin connector
between the PW-I board and CP-1 board as shown in
Fig. 2-1-4. Fix the relay jig with screw if necessary.
Connect Relay jig (VHJ-0085) between the top of Pre-
amp unit and CNIOI on the CP-1 board.
NOTE: When repairing or adjusting the Pre-amp unit,
temporary fasten or securely touch one end of the
shield case to the metal chassis.
CN02 connectorto
CN181 ofPre-amp unit
8-pinconnectorto
CN101 ofCP-1 board
Relay jig VHJ-0085
Fig. 2-1-1
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Fig. 2-1-2
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