(No.YA010)1-31
4.8
ADJUSTMENT PROCEDURE
4.8.1 CHECK ITEM
4.8.2 HIGH VOLTAGE
4.8.3 HORIZONTAL FREQUENCY
Item
Measuring
instrument
Test point
Adjustment part
Description
B1 POWER
SUPPLY
check
Signal
generator
DC voltmeter
Remote
control unit
S1 Connector
TP-91
TP-E
[MAIN PWB]
[2. V/C]
1. CUT_OF_R
SCREEN VR
[In FBT]
(1) Receive the black and white signal (color off).
(2) Connect the DC voltmeter to TP-91 (S1 connector 5
pin) and TP-E (S1 connector 1 pin).
(3) Select 2. V/C.
(4) Select < 1. CUT_OF_R >.
(5) Show one horizontal line with the [YELLOW (FREEZE/
SWAP)] key.
(6) Turn the SCREEN VR counterclockwise to display
whole black screen.
(7) Make sure that the voltage is DC148V (±2V).
(8) Readjust the SCREEN VR to appear the horizontal
line faitly, and cancel the horizontal line by pressing
the [YELLOW (FREEZE/SWAP)] key.
Item
Measuring
instrument
Test point
Adjustment part
Description
HIGH VOLTAGE
Signal
generator
HV voltmeter
Remote
control unit
CRT anode
[2. V/C]
1. CUT_OF_R
EHT ADJ VR (R2528)
[EHT PWB]
SCREEN VR
[In FBT]
(1) Receive the black and white signal (color off).
(2) Connect the HV voltmeter to CRT anode and
chassis GND.
(3) Select 2. V/C.
(4) Select < 1. CUT_OF_R >.
(5) Show one horizontal line with the [YELLOW (FREEZE/
SWAP)] key.
(6) Turn the SCREEN VR counterclockwise to display
whole black screen.
(7) Adjust EHT ADJ VR so that the voltage become
31kV (±0.2V).
(8) Readjust the SCREEN VR to appear the horizontal
line faitly, and cancel the horizontal line by pressing
the [YELLOW (FREEZE/SWAP)] key.
Item
Measuring
instrument
Test point
Adjustment part
Description
HORIZONTAL
FREQUENCY
Remote
control unit
[4. DEF]
1. FREE-RUN
(1) Receive any broadcast.
(2) Select 4. DEF.
(3) Confirm that when you enter to the 4. DEF, the
screen automatically show the FREE-RUN screen.
And the picture run up or down.
(4) Adjust the < 1. FREE-RUN > to stop the picture. But
the picture does not stop completely.
(5) Press the [MENU] key to memorize the adjustment
data.