JVC AV-29ST16, Service Manual

Page: 19 / 80

(No.YA469)1-19
4.8 ADJUSTMENT PROCEDURE
4.8.1 CHECK ITEM
4.8.2 TUNER / IF CIRCUIT
Item
Measuring
instrument
Test point Adjustment part Description
B1 VOLTAGE DC voltmeter
Remote
control unit
CN00X connector
1-pin:TP-B1
5-pin:TP-E
[MAIN PWB]
(1) Receive any broadcast.
(2) Connect a DC voltmeter to 1-pin and 3-pin of
CN00X
connector.
(3) Make sure that the voltage is DC134.5V ±2.0V .
HIGH VOLTAGE HV voltmeter
Remote
control unit
CRT anode
Chassis GND
(1) Receive any broadcast.
(2) Connect the earth clip of HV voltmeter to chassis
GND.
(3) Connect the probe of HV voltmeter to CRT anode.
(4) Make sure that the voltage is
DC30.5kV ± 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 any broadcast.
(4) Check the
←
(Arrow) posspition between the ABOVE
REF. and BELOW REF.
TOO HIGH
ABOVE REFERENCE
JUST REFERENCE
BELOW REFERENCE
TOO LOW
VCO (CW) . MHz
DISPLAY : EXIT
Receiving frequency
YELLOW
1. VCO
2. DELAY POINT
IF SERVICE MENU
DISPLAY : EXIT 1 : SELECT
Item
Measuring
instrument
Test point Adjustment part Description
DELAY POINT
(AGC) Signal
generator
Remote
control unit [1. IF]
2. DELAY POINT
(AGC TAKE-OVER) (1) Receive a black and white signal (colour off).
(2) Select 1. IF.
(3) Select
<2. DELAY POINT> .
(4) Set the setting values of the setting items as shown
bellow table.
(5) Then adjust the [MENU - / +] keys until video noise
disappears.
(6) Turn to other channels and make sure that there are
no irregularities.
Setting Item
Variable range Initial setting value
28
28
DELAY POINT
(AGC TAKE-OVER)
0 - 127
NTSC3.58
OTHER