Sharp 21G-FX10L, Service Manual

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21G-FX10L
5 – 11
PROTECTOR OPERATION CHECKING
NO
ADJUSTMENT POINT
WAVEFORM OR OTHERS
1 H, V PROTECTOR (1) Receive US 4 CH LION HEAD Signal (NTSC 60 Hz).
(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
28.5V
. Make sure the protector is functioned, horizontal oscilation stop
and picture disappear.
(5) Pull out the AC cord at least 4 second before plugging in again (to make sure ohm -COM has
been reset) for the set to recover from protector mode
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)
A/V INPUT & OUTPUT CHECKING
NO
ADJUSTMENT POINT
WAVEFORM OR OTHERS
1 VIDEO AND AUDIO (1) Receive the "US 10 CH HALF Color Bar" signal.
OUTPUT CHECK (2) Terminate the Video output with a 75 ohm impedance.
( At signal is standard Color Bar Y/C=1/1, 87.5% Mod.)
Make sure the output is as specified
(1.0 Vp-p ± 3 dB).
(3) Terminate the Audio output with a 47K ohm impedance.
( 400 Hz 100 % Mod. 47 k ohm, VOL Max. )
(2.5 Vp-p ± 0.5Vp-p)
.
.
2 VIDEO AND AUDIO (1) Using the INPUT key on the remote controller, make sure that the modes change in order of
INPUT CHECK TV, INPUT1,INPUT2 & TV again and the video & audio output are according
to the input terminal for each mode.
(2) Video cross-talk INPUT to TV checking :
a) When connect INPUT1 input, check TV also
b) When connect INPUT2 input, check TV also
3
HEADPHONE
(1) Receive "US 4 CH LION HEAD Signal ( NTSC 60 Hz )" signal.
CHECK (2) Maximum volume , and check the headphone output with 400Hz sound and no sound
output from speaker.
ADJUSTMENT CONDITION / PROCEDURE
ADJUSTMENT CONDITION / PROCEDURE
Set volume to max, make sure the O/P is as specified