Sharp 21YF30, Руководство по обслуживанию

Страница: 11 / 60

11
11-1 11-2
21YF30
PAL CHROMA ADJUSTMENT
No. Adjustment point Adjustment procedure/conditions Waveform and others
SUB COLOUR
(I
2
C BUS
CONTROL)
(to be done
aftersub-
picture, sub-
tint adj)
1) Receive the “PAL Color Bar” signal.
2) Press R/C to set Picture Normal condition.
3) Connect the oscilloscope to R-Amp Transistor
Base(TP 851).
Range : 100 mV/Div (AC)
(Using 10:1 Probe)
Sweep Time : 10
µ
sec/Div
4) Using the R/C call V05 in SERVICE mode. Ad-
just V05 bus data, so that the 75% White & Red
portions of PAL Color Bar be at the same level
shown as Fig 1-1.
5) Clear the SERVICE mode.
1
Fig. 1-1
Cy G B
W Y 100% W Mg R 75%
No. Adjustment point Adjustment procedure/conditions Waveform and others
SUB-TINT (I
2
C
BUS CON-
TROL)
1) Receive the "NTSC3.58 Color Bar" signal thru AV
in.
2) Connect the oscilloscope to B-Amp Transistor
Base (TP853 ).
»
Range : 100mV/Div. (AC)(Use Probe 10:1)
»
Sweep time : 10
µ
sec/Div.
3) In Service mode, go to V07, then press R/C Y-
mute (Hex E4) or FLASHBACK key.
4) Call the "V07" mode in service mode. Adjust the
"V07" bus data to obtain the waveform shown as
Fig. 1-1.
5) Disable Y-Mute by pressing key(Hex E4) or
FLASHBACK key, then Clear the SERVICE
mode.
1
Fig. 1-1
NTSC CHROMA ADJUSTMENT
W Y Cy G Mg R B
No. Adjustment point Adjustment procedure/conditions Waveform and others
BEAM PRO-
TECTOR 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 PROTEC-
TOR 2
OTHER PRO-
TECTOR 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
No. Adjustment point Adjustment procedure/conditions Waveform and others
VIDEO AND
AUDIO
OUTPUT
CHECK 1) Receive the "PAL Color Bar" signal (100% White
Color Bar, Sound 400 Hz 100% Mod.)
2) Terminate the Video output with a 75 ohm imped-
ance. Make sure the output is as specified (1.0
Vp-p
±
3 dB).
3) Terminate the Audio output with a 75 ohm imped-
ance. Make sure the output is as specified (1.2
Vp-p
±
3 dB).
1
VIDEO AND
AUDIO INPUT
CHECK 2
COMPONENT
IN CHECK 3
PROTECTOR OPERATION CHECKING
A/V INPUT, OUTPUT & COMPONENT IN CHECKING
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 23.5V, and make sure
the protector is working.
1) Using the TV/VIDEO key on the remote control-
ler, 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.
1) Connect YUV & Audio signal to Component In
terminal and Audio terminal.
2) Using the TV/VIDEO key on the remote control-
l e r, p r e s s i t u n t i l t h e m o d e c h a n g e t o
COMPONENT, confirm output is appear.