AV-32430
AV-32432
3.6 ADJUSTMENT PROCEDURE
3.6.1 CHECK ITEM
Measuring
ItemTest pointAdjustment partDescription
instrument
B1 POWERDC voltmeterB1 Connector(1) Receive the black-and-white signal. (color off)
SUPPLY TP-91, TP-E(2) Connect the DC voltmeter to TP-91 (B1 connector 1
checkSignal[MAIN PWB]pin) and TP-E (B1 connector 3 pin).
generator(3) Confirm that the voltage is DC134V?2V.
3.6.2 IF VCO
Measuring
ItemTest pointAdjustment partDescription
instrument
IF VCORemote [9.VCO]? It must not adjust without inputting the RF signal.
control unitCW transf. (T111)(1) Receive a broadcast.
[MAIN PWB](2) Select 9.VCO.
(3) Change the [AFC] to OFF and [FINE] to 0.
(4) Confirm that the color change from "TOO HIGH" to
"TOO LOW" by CW transf. on MAIN PWB, and
check the [SYNC] is YES.
(5) Adjust CW transf. until "GOOD" letters turns green.
And then confirm that the [SYNC] is YES again.
TOO HIGH GOOD TOO LOWAdjustment can be done in this statement.
(6) It return the [AFC] to ON.
SYNC: YES
(7) Push the [EXIT] key to exit the [9.VCO] mode.
AFC ON
FINE 0
3.6.3 RF AGC
Measuring
ItemTest pointAdjustment partDescription
instrument
RF AGCSignal [1.V/C(S)](1) Receive a black-and-white signal (colour off).
generatorS21 : AGC ADJ(2) Select 1.V/C.
(3) Select <S21>(AGC ADJ).
Remote (4) Press the [MUTING] key and turn the picture color
control unitoff.
(5) With the [VOLUME (-)] key to get the noise in the
screen picture (zero side of setting value).
(6) Press the [VOLUME (+)] key several times and step
VariableInitial settingwhen noise disappears from the screen (at that time,
No.Setting item
rangevalue
not to increase the value too much).
S21AGC ADJ0~12780(7) Change to other channels and make sure that there
is no irregularity.
(8) Press the [MUTING] key and get color out.
3.6.4 FOCUS
Measuring
ItemTest pointAdjustment partDescription
instrument
FOCUSSignal FOCUS VR(1) Receive the crosshatch signal.
generator[In HVT](2) While looking at the screen, adjust the FOCUS VR
to the vertical and horizontal lines will be clear and in
fine detail.
(3) Make sure that the picture is in focus even when the
screen gets darkened.
(No.52104)1-19 |
ACEC
JVC
