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4.8
ADJUSTMENTS PROCEDURE
4.8.1 CHECK ITEM
Measuring
Item
instrument
B1 POWER
DC voltmeter
SUPPLY
check
Remote
control unit
HIGH VOLTAGE
HV voltmeter
check
Remote
control unit
IF VCO
Remote
check
control unit
IF SERVICE MENU
1. VCO
2. ATT ON/OFF
VCO(CW)
TOO HIGH
ABOVE REF
JUST REF
BELOW REF
TOO LOW
1-24 (No.YA063)
Test point
Adjustment part
X connector
[2.V/C]
1-pin:TP-91(B1)
1.RGB BLK
5-pin:TP-E
[POWER DEF
PWB]
CRT anode
[2.V/C]
1.RGB BLK
Chassis GND
[1.IF]
1.VCO
Do not move
**** MHz
Description
(1) Receive the any broadcast.
(2) Select 2. V/C from the SERVICE MENU.
(3) Select < 1. RGB BLK >.
(4) Press the [FUNCTION + ( )] key to find the cut off
screen (Black screen).
(5) Connect a DC voltmeter to TP-91(B1) and TP-E.
(6) Make sure that the voltage is DC139V ± 2.0V.
(7) Press the [FUNCTION - ( )] key to return to service
menu.
(1) Receive the any broadcast.
(2) Select 2. V/C from the SERVICE MENU.
(3) Select < 1. RGB BLK >.
(4) Press the [FUNCTION + ( )] key to find the cut off
screen (Black screen).
(5) Connect a HV voltmeter to CRT ANODE and
chassis GND.
(A ground side is connected previously)
(6) Ma k e sure that the vol ta ge is DC 3 1.0kV
(+1kV / -1.5kV).
(7) Press the [FUNCTION - ( )] key to return to service
menu.
NOTE:
When removing a prove, an anode side is removed
previously.
• Under normal conditions, no adjustment is required.
• It must not adjust without broadcast signal.
(1) Receive the any broadcast.
(2) Select 1.IF from the SERVICE MENU.
(3) Select < 1.VCO >.
(4) Check the ←(arrow) position between the ABOVE
REF. and BELOW REF.
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