JVC AV-27F577/R Service Manual page 29

Measuring
Item
instrument
SUB TINT Remote
control unit
Signal
generator
Oscilloscope
Remote
control unit
Y
W
4.8.5 MTS CIRCUIT [1.Digital Service]
Measuring
Item
instrument
MTS INPUT Remote
LEVEL control unit
MTS TV audio
SEPARATION multiplex
signal
generator
Oscilloscope
Remote
control unit
L-Channel
signal waveform
1 cycle
Test point Adjustment part
[1.Adjust]
S04 : TINT
TP-B [1.Adjust]
TP-E S04 : TINT
[CRT SOCKET PWB]
G
R
( )
0V
C B
(B)
M
( )
Test point Adjustment part
[1.Adjust]
A01: IN LEVEL
R OUT [1.Adjust]
L OUT A02: LOW SEP
[AUDIO OUT] A03: HIGH SEP
R-Channel
crosstalk portion
Minimum
Input the stereo R signal
(3kHz) and change
Description
[ Method of adjustment without measuring instrument ]
• SUB CONTRAST adjustment should be finished.
(1) Receive any broadcast.
(2) Set VIDEO STATUS to "STANDARD".
(3) Select COLOR TEMPERATURE to "LOW".
(4) Select the 2.TV-Micro Service from the SERVICE
MODE.
(5) Select the 1. Adjust.
(6) Select < S04 >(TINT).
(7) Set the initial setting value of the < S04 >.
(8) If the tint is not the best with the initial setting values,
make fine adjustment until you get the best tint.
(9) Press the [MUTING] key to memorize the set value.
[ Method of adjustment using measuring instrument ]
• SUB CONTRAST adjustment should be finished.
(1) Input the full color bar signal includes the 75% white.
(2) Set VIDEO STATUS to "STANDARD".
(3) Select COLOR TEMPERATURE to "LOW".
(4) Select the 2.TV-Micro Service from the SERVICE
MODE.
(5) Select the 1. Adjust.
(6) Select < S04 >(TINT).
(7) Set the initial setting value of the < S04 >.
(8) Connect the oscilloscope between
(9) Adjust < S04 > and bring the voltage of (B) in the
illustration to +17V. (voltage difference between
white and magenta).
(10) Press the [MUTING] key to memorize the set value.
Description
(1) Receive any broadcast.
(2) Select the 1.Digital Service from the SERVICE
MODE.
(3) Select the 1.Adjust.
(4) Select the < A01 > (IN LEVEL).
(5) Set the initial setting value of < A01 >.
(6) Press the [MUTING] key to memorize the set value.
(1) Input the stereo L signal (300 Hz) from the TV audio
multiplex signal generator to the antenna terminal.
(2) Connect an oscilloscope to R OUT pin of the AUDIO
OUT, and display one cycle portion of the 300 Hz
signal.
(3) Select the 1.Digital Service from the SERVICE
MODE.
(4) Select the 1.Adjust.
(5) Select the < A02 > (LOW SEP).
(6) Set the initial setting value of < A02 >.
(7) Adjust the < A02 > so that the stroke element of the
300Hz signal will become minimum.
(8) Press the [MUTING] key to memorize the set value.
(9) Input the stereo R signal (3kHz) and change the
connection of the oscilloscope to L OUT pin of the
AUDIO OUT.
(10) Similarly adjust < A03 > (HIGH SEP).
(11) Press the [MUTING] key to memorize the set value.
TP-B and TP-E.
(No.YA387)1-29