Picture Quality Adjustments - Sony KV-EF34M31 Service Manual

KV-EF34M31/EF34M61/EF34M80/EF34M90/EF34M91

4-3. PICTURE QUALITY ADJUSTMENTS

SUB COLOR ADJUSTMENT (SCL)
1. Set to service mode.
2. Input RF PAL colorbar signal.
Set A/V control to PERSONAL.
3. Set to VP7 (Service mode) "DYC" = 0
4. Set the following condition.
Picture to 100%, Color to 0% and Bright to 0%.
5. Connect an oscilloscope to the pin 3 (BLUE) of CN705, C
board.
6. Using the 1 and 4 buttons select SAJ 3 (Service mode)
"SCL".
7. Using the 3 and 6 buttons on the Remote Commander to
adjust to VB2 = VB3 = VB4 with 3 and 6.
8. Write into the memory by pressing "MUTING" then "0".
9. Input NTSC colorbar signal to VIDEO1 and select VIDEO1
input.
10. Adjust as step 4. and 8. by receving NTSC colorbar.
11. Reset to VP 7 (Service mode) "DYC" = 1.
VB1 VB2 VB3 VB4
PAL :
VB2 = VB3 = VB4
(Difference is within 70mV)
NTSC :
VB1 = VB4
(Difference is within 70mV)
SUB HUE ADJUSTMENT (SHU)
12. Set to service mode.
13. Input NTSC colorbar signal to VIDEO1 and select VIDEO1
input.
14. Set to VP 7 (Service mode) "DYC" = 0
15. Connect an oscilloscope to the pin 3 (BLUE) of CN705, C
board.
16. Using the 1 and 4 buttons select SAJ 1 (Service mode) "SHU
(VIDEO)".
17. Using the 3 and 6 buttons on the Remote Commander to
adjust to VB2 = VB3 = VB4 with 3 and 6.
18. Write into the memory by pressing
19. Reset to VP 7 (Service mode) "DYC" = 1.
RM-951
same level
then -.
MUTING
– 48 –
VB1 VB2 VB3
The highest level of VB1,VB2,VB4
will be aligned at the same line.
The ideal different level between VB2 and
VB3 is within ±110mV.
20. Select "TWIN PICTURE" mode. (MID)
21. Receive different RF PAL white signals in MAIN and SUB
picture.
22. Adjust RV5301 on B board so that the level at pin 2 (BLUE)
of CN705 on C board becomes within spec.
23. Receive RF NTSC colorbar signal in MAIN picture and
VIDEO1 NTSC colorbar signal in SUB picture.
24. Adjust SVP2 (Service mode) "SHU (VIDEO)" so that the level
at pin 3 (BLUE) of CN705 on C board becomes within spec.
25. Write into the memory by pressing
26. Write SJA 3 (Service mode) "SCL (PAL)" +4 steps to SJA 3
(Service mode) "SCL (PAL)".
Write SJA 3 (Service mode) "SCL (NTSC)" +3 steps to SJA 3
(Service mode) "SCL (NTSC)".
Write SJA 1 (Service mode) "SHU (VIDEO)" +3 steps to SJA
1 (Service mode) "SHU (VIDEO)".
Write SJA 1 (Service mode) "SHU (VIDEO)" -5 steps to SJA 1
(Service mode) "SHU (TV)".
Write SVP 2 (Service mode) "SHU (VIDEO)" +3 steps to SVP
2 (Service mode) "SHU (VIDEO)".
Write SVP2 (Service mode) "SHU (VIDEO)" -2 steps to SVP
2 (Service mode) "SHU (TV)".
27. Reset to VP 7 (Service mode) "DYC" = 1
VB4
110mV
±20mV
then "0".
MUTING
110mV