Sharp 21C-FX1G Manuel d'entretien - Page 11
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FOCUS ADJUSTMENT
No. Adjusting point
Adjusting procedure/conditions
1
Focus
1. Receive the "Monoscope Pattern" signal.
2. Press R/C to set Picture NORMAL condition.
3. Adjust the focus control to get the best focusing.
PAL CHROMA ADJUSTMENT
No. Adjusting point
Adjusting procedure/conditions
1
SUB COLOUR
1. Receive the "PAL Color Bar" signal.
(I2C BUS
2. Press R/C to set Picture Normal condition.
CONTROL)
3. Connect the oscilloscope to Red cathode.
Range :
20 V/Div (AC)
(Using 10:1 Probe)
Sweep Time : 10 µ sec/Div
4. Using the R/C call "SUB-COL" in SERVICE mode.
Adjust SUB COLOUR bus data, so that the 75%
White & Red portions of PAL Color Bar be at the
same level shown as Fig 10.
5. Clear the SERVICE mode.
* Before Adjust SUB-COL, COL-0P=8, COL-0S=8,
COL-03=4, COL-04=4.
After Adjust SUB-COL, set COL-0P=14, COL-
0S=14, COL-03=10, COL-04=10
Waveform and others
Waveform and others
Cy
G
W
Y 100% W
Mg R
75%
Fig. 10
11-1
NTSC CHROMA ADJUSTMENT
No. Adjusting point
Adjusting procedure/conditions
1
SUB-TINT (I2C
1. Receive the "NTSC3.58 Colour Bar" signal
BUS CON-
through AV in.
TROL)
2. Connect the oscilloscope to TP853 (Pin (5) of
P882) BLUE-OUT.
» Range
» Sweep time : 10 µsec/Div.
3. Call the "SUB-TINT" mode in service mode. Ad-
just the "SUB-TINT" bus data to obtain the wave-
form shown as Fig. 11.
4. Clear the SERVICE mode.
PROTECTOR OPERATION CHECKING
B
No. Adjusting point
Adjusting procedure/conditions
1
BEAM PRO-
1. Receive "Monoscope Pattern" signal.
TECTOR
2. Set CONTRAST MAX.
3. Set BRIGHT MAX.
4. During the Collector & Emitter of Q883/5/7 short,
make sure the protector ON and switch to standby
mode.
2
H, V PROTEC-
1. Receive "Monoscope Pattern" signal.
TOR
2. Connect output of Bias Box to D607 cathode
(R606 side).
3. Set voltage of Bias Box to 18V and make sure
the protector is not work.
4. Set voltage of Bias Box to 27V, and make sure
the protector is work.
3
OTHER PRO-
1. Once finish rectified Electrolytic Capacitor short
TECTOR
testing in +B line, check all possible damaged
components on +B line.
(Use random selected set for inspection)
A/V INPUT AND OUTPUT CHECKING
No. Adjusting point
Adjusting procedure/conditions
1
VIDEO AND
1. Receive the "PAL Color Bar" signal (100% White
AUDIO
Color Bar, Sound 400 Hz 100% Mod.)
OUTPUT
2. Terminate the Video output with a 75 ohm imped-
CHECK
ance. Make sure the output is as specified (1.0
Vp-p ±3 dB).
3. Terminate the Audio output with a 10k ohm im-
pedance. Make sure the output is as specified
(1.76 Vp-p ±3 dB).
2
VIDEO AND
1. Using the TV/AV key on the remote controller,
AUDIO INPUT
make sure that the modes change in order of TV,
CHECK
AV1, AV2 & TV again and the video & audio out-
put are according to the input terminal for each
mode.
Waveform and others
SAME LEVEL
: 100mV/Div. (AC)(Use Probe 10:1)
W Y Cy G Mg R B
Waveform and others
* Select one of Q883/5/7 to do
each short test.
Waveform and others
11-2
Fig. 11