Sharp 21SFX10L Service Manual - Page 20

PROTECTOR OPERATION CHECKING, A/V INPUT & OUTPUT CHECKING, At signal is standard Color Bar Y/C=1/1

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21S-FX10L PROTECTOR OPERATION CHECKING NO ADJUSTMENT POINT ADJUSTMENT CONDITION / PROCEDURE 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 -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 ADJUSTMENT CONDITION / PROCEDURE 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 , VOL Max. ) (a) Go to feature menu, set the FAO to OFF Make sure the O/P is as specified (2.5 Vp-p ± 0.5Vp-p). (b) Go to feature menu, set the FAO to ON Make sure the O/P is as specified (1.2 Vp-p ± 0.3Vp-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, COMPONENT, 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 COMPONENT IN (1) Connect YUV & Audio signal to Component In terminal and Audio terminal. CHECK (2) Using the INPUT key on the remote controller, press it until the modes change to COMPONENT, confirm output is appear. WAVEFORM OR OTHERS WAVEFORM OR OTHERS NOTE: When FAO is set to ON, SPEAKER will automatically turn OFF. TV volume control is disabled 5 - 8

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21S-FX10L
5 – 8
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
-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.
NOTE:
When FAO is set to ON, SPEAKER will
( At signal is standard Color Bar Y/C=1/1, 87.5% Mod.)
automatically turn OFF. TV volume control
Make sure the output is as specified
(1.0 Vp-p ± 3 dB).
is disabled
(3) Terminate the Audio output with a 47K ohm impedance.
( 400 Hz 100 % Mod. 47 k
, VOL Max. )
(a) Go to feature menu, set the FAO to OFF
Make sure the O/P is as specified
(2.5 Vp-p ± 0.5Vp-p)
.
(b) Go to feature menu, set the FAO to ON
Make sure the O/P is as specified
(1.2 Vp-p ± 0.3Vp-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, COMPONENT, 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
COMPONENT IN
(1) Connect YUV & Audio signal to Component In terminal and Audio terminal.
CHECK
(2) Using the INPUT key on the remote controller, press it until the modes change to COMPONENT,
confirm output is appear.
ADJUSTMENT CONDITION / PROCEDURE
ADJUSTMENT CONDITION / PROCEDURE