Sharp CX51TXZ, Руководство по обслуживанию

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10
10-1 10-2
CX51TXZ
PAL CHROMA ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions Waveform and others
Sub-colour
I
2
C bus
adjustment
1. Receive the “PAL Colour Bar” signal.
2. Press R/C to set Picture Normal condition.
3. Connect the oscilloscope to TP852 (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 Colour Bar be at the
same level shown as
Fig. 4.
5. Clear the SERVICE mode.
1
NTSC CHROMA ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions Waveform and others
Sub-tint
I
2 C bus
adjustment
1. Receive the “NTSC3.58 Colour Bar” signal for
SUB-TINT adjustment.
2. Connect the oscilloscope to TP801 (Pin (36) of
IC801 (B-Y)).
»
Range : 100 mV/div. (AC)(Use Probe 10:1)
»
Sweep time : 10
µ
sec/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. 5.
4. Clear the SERVICE mode.
1
Cy G B
W Y 100%W
75%
Fig. 4
Mg R
W Y Cy G Mg R B
Fig. 5
A=B=C
(B–Y)
A
B
C
SECAM CHROMA ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions Waveform and others
SECAM black
level
(R-Y/B-Y)
I
2 C bus
adjustment
1. Receive “SECAM COLOUR BAR” signal.
2. Set SECAM black level adjustment into R-Y mode.
3. Connect oscilloscope to TP802 (Pin (35) of IC801
(R-Y out)).
»
Range : 100 mV/div. (AC)(Use 10:1 Probe)
»
Sweep time : 10
µ
sec/div.
4. Adjust the offset of R-Y to minimum, shown in
Fig. 6-1 (b).
Adjust the offset of between no-signal line and
signal line be minimum.
5. Call the SECAM black level adjustment into B-Y
mode.
6. Connect again oscilloscope to TP801 (Pin (36) of
IC801 (B-Y out)) with the similar condition as (3).
7. Adjust the offset of B-Y to minimum, shown in Fig.
6-2 (b).
Adjust the offset of between no-signal line and
signal line be minimum.
1
OFF SET
OFF SET
Fig. 6-1 (a)
Fig. 6-1 (b)
Fig. 6-2 (a)
Fig. 6-2 (b)