AV-N21204
3.7 ADJUSTMENTS PROCEDURE
3.7.1 B1 POWER SUPPLY VOLTAGE CHECK
Measuring
ItemTest pointAdjustment partDescription
instrument
B1 POWER DC voltmeter TP-91 (B1)(1) Receive the black-and-white signal.
SUPPLYTP-E(2) Connect the DC Voltmeter to TP-91 (B1) and TP-E.
check(3) Confirm that the voltage is DC134V.
3.7.2 TUNER CIRCUIT / FOCUS
Measuring
ItemTest pointAdjustment partDescription
instrument
IF VCORemote[VCO(CW)]Under normal conditions, no adjustment is required.
control unit(1) Receive the NTSC broadcast (use channels without
CW transf. (T131)offset frequency).
(2) Select the VCO(CW) mode from the SERVICE
MENU.
(3) Change [AFC] to OFF and [FINE] to 0.
(4) Confirm the color change (yellow) from [TOO HIGH]
TOO HIGH
to [TOO LOW] by CW transf., and [SYNC] is [YES]
ABOVE REFERENCE
being shown on the screen. Then, adjust CW transf.
BELOW REFERENCEYELLOW
until [BELOW REFERENCE] letters turns yellow and
TOO LOW
confirm again [SYNC] is [YES].
SYNC : YES(5) It returns the [AFC] to ON.
EXIT BY
EXIT
RF AGCRemote[PICTURE](1) Receive the broadcast.
control unit<19. RF AGC>(2) Select PICTURE mode.
(3) Select <19. RF AGC>.
(4) Press the [MUTING] key and turn the color off.
(5) Get the noise in the screen with the [VOL (-)] key (0
side of setting value).
Setting itemInitial setting value(6) Press the [VOL (+)] key, and stop when noise
disappears in the screen.
19. RF AGC40(7) Change to other channels and make sure that there
is no irregularity.
(8) Press the [MUTING] key and get the color.
FOCUSSignalFOCUS VR(1) Receive the crosshatch signal.
generator[In HVT](2) While looking at the screen, adjust FOCUS VR so
that the vertical and horizontal lines will be clear and
Remotein fine detail.
control unit(3) Make sure that the picture is in focus even when the
screen gets darkened.
1-18 (No.52128) |
ACEC
