Power Circuit - JVC AV-2771S Service Manual

AV-2771S |
M ADJUSTM ENT PROCEDURE
Measuring
: Test point
instrument
POWER CIRCUIT
B1 POWER
SUPPLY check
eMAIN CIRCUIT
NOISE (RF AGC)
adjustment
SUB BRIGHT
adjustment
SUB PICTURE
adjustment
DC voltmeter TP-91
TP-E (1)
NOISE VR
(R135)
Pattern VSM SERVICE
generator switch
(S707)
Remote control
unit
Red Blue
§ vin
Ti co P! BR
106 098 065 099
Screen produced by setting the VSM SERVICE
switch to the service mode and pressing a
remote control unit FUNCTION key.
Pattern TP-47B VSM SERVICE
generator [CRT SOCKET | switch
PCB Ass'y] (S707)
Oscilloscope
(H-rate 10:1)
| Remote control
unit
28 (No.50577)
Adjustment part
Description
. Confirm that the voltage between TP-91 and TP-E
(_L) is pe 129.3v.
. Adjust the NOISE VR so that the noise appears in
the picture.
. Next the NOISE VR in a direction that the noise
disappears from the picture and stop at the point
where the noise has disappeared from the picture.
. Turn to another channel and confirm that there are
no abnormal ities.
. Use the remote control unit and reset the AV
STATUS(TINT, COLOR, PICTURE, BRIGHT and
DETAIL) .
. Set the VSM SERVICE switch to the S position.
. Press a FUNCTION key(A, V7, +, -) of the remote
control unit. Confirm picture as indicated in the
figure.
. Select BRIGHT and adjust the +/- key to optimum
brightness.
. After adjusting, return the VSM SERVICE switch
to N position.
. Use the remote control unit and reset the AV
STATUS(TINT, COLOR, PICTURE, BRIGHT and
DETAIL) .
. Receive the crosshatch signal.
. Set the VSM SERVICE switch to the S position.
. Correct the oscilloscope to TP-47B
. Select PICTURE and adjust the +/-keys so that
waveform "a" indicated inthe figure is 90V.
. After adjusting, return the VSM SERVICE switch
to N position.