JVC AV-29L6SU Service Manual page 19

4.8 ADJUSTMENT PROCEDURE
4.8.1 CHECK ITEM
Measuring
Item
instrument
B1 VOLTAGE DC voltmeter
Remote
control unit
HIGH VOLTAGE HV voltmeter
Remote
control unit
IF VCO Remote
control unit
VCO(CW) VCO(CW)
TOO HIGH TOO HIGH
ABOVE REFERENCE ABOVE REFERENCE
JUST REFERENCE JUST REFERENCE
BELOW REFERENCE BELOW REFERENCE
TOO LOW TOO LOW
4.8.2 FOCUS
Measuring
Item
instrument
FOCUS Signal
generator
HVT
Test point Adjustment part
X connector [2. V/C]
1-pin:TP-91 1. RGB BLK
5-pin:TP-E
[MAIN PWB]
CRT anode [2. V/C]
1. RGB BLK
Chassis GND
[1.IF]
VCO
216.00MHz 216.00MHz
i=EXIT i=EXIT
Test point Adjustment part
FOCUS VR
[In HVT]
FOCUS
SCREEN
Description
(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.
(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.
• 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.
Description
(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.
(No.YA366)1-19