Sharp 21JF2 Series, Руководство по обслуживанию

Страница: 25 / 78

21JF2-RU/GA/SA/SF/SS
3 – 22
10. PROTECTOR OPERATION CHECKING
11. A/V INPUT, OUTPUT CHECKING
No. Adjustment point Adjustment procedure/conditions Waveform and others
BEAM 1) Receive "Monoscope Pattern" signal.
2) Set CONTRAST MAX.
3) Set BRIGHT MAX.
4) During the Collector & Emitter of
Q853/4/5
short,
make sure the protector ON and switch to standby
mode.
1 * Select one of Q853/4/5 to do
each short.
H, V PROTECTOR 1) Receive "Monoscope Pattern" signal.
2) Connect output of Bias Box to
D602 cathode
(C602 positive).
3) Set voltage of Bias Box to 18V and make sure
the protector is not working.
4) Set voltage of Bias Box to 27V , and make sure
the protector is working.
2
OTHER
PROTECTOR 1) Once finish rectified Electrolytic Capacitor short
testing in +B line, check all possible damaged
components on +B line.
(Use random selected set for inspection)
3
PROTECTOR
No. Adjustment point Adjustment procedure/conditions Waveform and others
VIDEO AND
AUDIO
OUTPUT
CHECK 1
VIDEO AND
AUDIO INPUT
CHECK 2
1) Receive the "PAL Color Bar" signal (100%
White Color Bar, Sound 400 Hz 100% Mod).
1) Using the TV/VIDEO key on the remote
controller, make sure that the modes change in
order of TV, AV1, AV2 & TV again and the
video & audio output are according to the input
terminal for each mode.
2) Terminate the Video output with a 75 ohm
impedance. Make sure the output is as
specified
(1.0 Vp-p
±
3 dB) .
3) Terminate the Audio output with a 10K ohm
impedance. Make sure the O/P is as specified
(1.5 Vp-p
±
3 dB) .