JVC DT-V2000SU Service Manual page 63

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DT-V2000SU
NTSC 4 : 3 Y/C SEPARATE VIDEO SIGNAL CHROMA/PHASE
Test equipment Signal generator (75% Color bar pattern)
Test points
TP-47R[CRT SOCKET PWB], TP-47B[CRT SOCKET PWB]
Adjustment locations
COMB SW [SIGNAL PWB], SB04(PHASE), SB03(CHROMA), SB09(B-Y GAIN)
TP-47R WAVEFORM (adjust SB04) TP-47R WAVEFORM (adjust SB03) TP-47B WAVEFORM (adjust SB09)
1 .
2.
3.
4.
5.
6.
2 3
4
(Fig. 1)
(Fig. 2)
Input the NTSC Y/C separate video signal of the 75% color bar pattern to the INPUT B terminal.
Set the ASPECT to 4:3 in the MENU screen.
Set the CHROMA and PHASE VR on the front panel to the click position.
Turn the COMB SW to the "S" side.
Connect the oscillo-scope to the TP-47R and TP-47B.
2
3
(Fig. 3)
While observing the waveform of TP-47R, adjust the SB04 to obtain the straight waveform between 1 and 2, 3 and 4 (Fig.1 ).
4
7.
8.
And then while observing the waveform of the TP-47R, adjust the SB03 to obtain the straight waveform between 1 and2, 3 and 4 (Fig.2).
While observing the waveform of the TP-47B, adjust the SB09 to obtain the straight waveform all of 1 to 4 (Fig.3).
9. Confirm that the waveform of 1 to 4 are straight. If illeagal, readjust the step 6 to 8 as same steps.
10. Turn the COMB SW to "N" side, and confirm the chroma/phase condition not unusual.
480i 16: 9 OVER SCAN CHROMA/PHASE
Test equipment Signal generator(75% Color bar pattern)
Test points TP-47R[CRT SOCKET PWB], TP-47B[CRT SOCKET PWB]
Adjustment locations
COMB SW [SIGNAL PWB], SC04(PHASE), SC03(CHROMA), SC09(B-Y GAIN)
TP-47R WAVEFORM (adjust SC04) TP-47R WAVEFORM (adjust SC03)
TP-47B WAVEFORM (adjust SC09)
2
3
4
2 3
4
(Fig.1)
(Fig. 3)
(Fig. 2)
1. Input the 480i color bar pattern to the INPUT B terminal.
2. Set the ASPECT to 16:9 in the MENU screen.
3. Set the CHROMA and PHASE VR on the front panel to the click position.
4. Turn the COMB SW to the "S" side.
5. Connect the oscillo-scope to the TP-47R and TP-47B.
6. While observing the waveform of TP-47R, adjust the SC04 to obtain the straight waveform between 1 and 2, 3 and
4
(Fig.1 ).
7. And then while observing the waveform of the TP-47R, adjust the SC03 to obtain the straight waveform between 1 and2, 3 and 4 (Fig.2).
8. While observing the waveform of the TP-47B, adjust the SC09 to obtain the straight waveform all of 1 to 4 (Fig.3).
9. Confirm that the waveform of 1 to 4 are straight. If illeagal, readjust the step 6 to 8 as same steps.
10.Turn the COMB SW to "N" side, and confirm the chroma/phase condotion not unusual.
No.51519B 47