JVC AV-29L6SU, AV-29L6BU, Руководство по обслуживанию

Страница: 19 / 60

(No.YA366)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-91
5-pin:TP-E
[MAIN PWB] [2. V/C]
1. RGB BLK (1) Receive 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 DC139.0 ±2.0V.
HIGH VOLTAGE HV voltmeter
Remote
control unit
CRT anode
Chassis GND
[2. V/C]
1. RGB BLK (1) Receive 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 the earth clip of HV voltmeter to chassis
GND.
(6) Connect the probe of HV voltmeter to CRT anode.
(7) Make sure that the voltage is DC31.0kV(+1kV, -1.5kV).
NOTE:
• Remove the probe before removing the earth clip.
IF VCO Remote
control unit [1.IF]
VCO • Under normal conditions, no adjustment is required.
• Confirmation adjustment.
(1) Select 1.IF from the SERVICE MODE.
(2) Receive any broadcast.
(3) Check the
←
(Arrow) posspition between the ABOVE
REF. and BELOW REF.
VCO(CW) 216.00MHz VCO(CW) 216.00MHz
TOO HIGH TOO HIGH
ABOVE REFERENCE ABOVE REFERENCE
JUST REFERENCE JUST REFERENCE
BELOW REFERENCE BELOW REFERENCE
TOO LOW TOO LOW
i=EXIT i=EXIT
Item
Measuring
instrument
Test point Adjustment part Description
FOCUS Signal
generator FOCUS 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
so that the vertical and horizontal lines will be clear
and in fine detail.
(4) Make sure that the picture is in focus even when the
screen gets darkened.
HVT
SCREEN
FOCUS