Sharp 21F-PA330I Service Manual page 11

PAL CHROMA ADJUSTMENT
Adjusting point Adjusting procedure/conditions
No.
SUB-COLOUR 1. Recive the "PAL Colour Bar " signal
1
(I2C BUS 2.
Press R/C to set Picture Normal condition.
CONTROL) 3. Connect the osilloscope to R-Amp Transistor Base
(to be done after (TP851).
sub-picture, Range :100mV/Div(AC) (User Probe10:1)
n
sub tint adj) Sweep Time : 10 µsec/Div.
n
4. Using the R/C call V05 in Service mode. Adjust V05
bus data, so that the 75% White & Red portions of
PAL Colour Bar be at the same level shown as
Fig 1-1.
5.
Clear the Service mode.
NTSC CHROMA ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions
1 SUB-TINT 1.
Recive the "NTSC3.58 Colour Bar " signal thru
(I2C BUS
AV in.
CONTROL) 2. Connect the osilloscope to B-Amp Transistor Base
(TP853).
Range :100mV/Div(AC) (User Probe10:1)
n
Sweep Time : 10 µsec/Div.
n
3. In Service mode, go to V07, press R/C Y- mute
(Hex E4) or FLASHBACK Key.
4. Call the "V07" data in service mode. Adjust the
"V07" bus data to obtain the waveformshown as
Fig. 1-1.
5. Disable Y-Mute by pressing key(Hex E4) or
FLASHBACK, then clear the SERVICE mode.
PROTECTOR OPERATION CHECKING
No.
Adjusting point Adjusting procedure/conditions
1 BEAM 1. Receive "Monoscope Pattern" signal.
PROTECTOR 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.
2
H, V PROTECTOR 1. Receive "Monoscope Pattern" signal.
2. Connect output of Bias Box to D602 cathode
(C602 positive).
Set voltage of Bias Box to 18V and make sure
3.
the protector is not working.
4. Set voltage of Bias Box to 27V, and make sure
the protector is working.
3
OTHER 1. Once finish rectified Electrolytic Capacitor short
PROTECTOR testing in +B line, check all possible damaged
components on +B line.
(Use random selected set for inspection)
Wavefrom and others
Cy G B
W Y 100% W Mg R
75%
Fig. 1-1
Wavefrom and others
W Y Cy G Mg R B
Fig. 1-1
Wavefrom and others
*Select one of Q853/4/5 to do each
short.
11-1
A/V INPUT, OUTPUT & COMPONENT IN CHECKING
No. Adjusting point Adjusting procedure/conditions
1
VIDEO AND 1. Receive the "PAL Colour Bar" signal (100%White
AUDIO OUTPUT Colour Bar, Sound 400Hz 100% Mod.)
CHECK 2. Terminate the Video output with a 75 ohm impedance.
Make sure the output is as specified (1.0 Vp-p
3. Terminate the Audio output with a 10K ohm
impedance. Make sure the O/P is as specified
+ _
(1.5 Vp-p 3dB).
2 VIDEO AND 1.
Using the TV/VIDEO 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 output
are according to the input terminal for each mode.
1. Using the TV/AV key on the remote controller, make
sure that the modes change in order of TV, AV & TV
again and the video & audio output are according to
the input terminal for each mode. If connect input to
front and rear AV terminal, input terminal of front AV
will be selected.
3 COMPONENT 1.
Connect YUV & Audio signal to Component In terminal
IN CHECK
and Audio terminal.
2. Using the TV/VEDIO key on the remote controller,
press it until the modes change to COMPONENT,
confirm output is appear.
FUNCTION OPERATION CHECKING (VIDEO AND AUDIO)
No. Adjusting point Adjusting procedure/conditions
1 CONTRAST key
1. Receive "Monoscope Pattern" signal.
2. Set MENU, then go into PICTURE mode to select
CONTRAST.
3. Press Volume UP/Down key to check whether the
CONTRAST effect is OK or not.
2 COLOUR key 1. Receive "Colour Bar" signal.
2. Set MENU, then go into PICTURE mode to select
COLOUR.
3. Press Volume UP/Down key to check whether the
COLOUR effect is OK or not.
3 BRIGHTNESS key
1. Receive "Monoscope Pattern" signal.
2. Set MENU, then go into PICTURE mode to select
BRIGHTNESS.
3. Press Volume UP/Down key to check whether the
BRIGHTNESS effect is OK or not.
4 TINT key 1. Receive "NTSC Colour Bar" signal thru AV in.
2. Set MENU, then go into PICTURE mode to select
TINT.
3. Press Volume UP/Down key to check TINT, UP
for GREEN direction and DOWN for PURPLE
direction whether is OK or not.
5 SHARPNESS
1. Receive "Monoscope Pattern" signal.
key
2. Set MENU, then go into PICTURE mode to select
SHARPNESS.
3. Press Volume UP/Down key to check whether the
SHARPNESS effect is OK or not.
Wavefrom and others
+ _
3dB).
Wavefrom and others
11-2