(No.YA164)1-19
4.8 ADJUSTMENT PROCEDURE
4.8.1 CHECK ITEM
4.8.2 FOCUS
Item
Measuring
instrument
Test point
Adjustment part
Description
B1 VOLTAGE
DC voltmeter
Remote
control unit
X connector
1-pin:TP-E
5-pin:TP-91
[POWER DEF
PWB]
[2. V/C]
1. RGB BLK
(1) Receive a any broadcast.
(2) Select 2. V/C from the SERVICE MODE.
(3) Select < 1.RGB BLK >.
(4) Press the [[MENU / ] 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 DC139.9 ±2.0V.
HIGH VOLTAGE
HV voltmeter
Remote
control unit
CRT anode
Chassis GND
[2. V/C]
1. RGB BLK
(1) Receive a any broadcast.
(2) Select 2. V/C from the SERVICE MODE.
(3) Select < 1. RGB BLK >.
(4) Press the [MENU / ] key to find the cut off screen
(Black screen).
(5) Connect a HV voltmeter to CRT anode and chassis
GND.
(6) Make sure that the voltage is DC31.5kV(+1kV, -1.5kV).
NOTE:
Remove the probe before removing the earth clip.
IF VCO
Remote
control unit
[1.IF]
1.VCO
Under normal conditions, no adjustment is required.
Confirmation adjustment.
(1) Select 1.IF from the SERVICE MODE.
(2) Select < 1.VCO >
(3) Receive a any broadcast.
(4) Check the (Arrow) posspition between the ABOVE
REF. and BELLOW REF.
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Item
Measuring
instrument
Test point
Adjustment part
Description
FOCUS
Signal
generator
FOCUS1 VR
FOCUS2 VR
[In HVT]
(1) Receive the cross hatch signal.
(2) Set the ZOOM mode to REGULAR.
(3) While looking at the screen, adjust the FOCUS VR
to the vertical and horizontal lines will be clear and
infine detail.
(4) Make sure that the picture is in focus even when the
screen gets darkened.
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