Ntsc Color Demodulation Adjustment; Analog Rgb Max Contrast Adjustment - Sony TRINITRON PVM-14N1A Service Manual

Ill. Signal System Adjustment
1. VIDEO OUT level Adjustment
Serial No. 6000222 and Higher (PVM-14N1A)
Serial No. 6003700 and Higher (PVM-14N1E)
Serial No. 6000001 and Higher (PVM-14N1MDE)
Serial No. 6003584 and Higher (PVM-14N1U)
Serial No. 6000097 and Higher (PVM-14N2A)
Serial No. 6002486 and Higher (PVM-14N2E)
Serial No. 6002320 and Higher (PVM-14N2U)
Serial No. 6000001 and Higher (SSM-14N1A)
Serial No. 6002356 and Higher (SSM-14N1E)
Serial No. 6002572 and Higher (SSM-14N1U)
Serial No. 6000092 and Higher (PVM-20N1A)
Serial No. 6000924 and Higher (PVM-20N1E)
Serial No. 6001488 and Higher (PVM-20N1U)
Serial No. 6000049 and Higher (PVM-20N2A)
Serial No. 6000799 and Higher (PVM-20N2E)
Serial No. 6000848 and Higher (PVM-20N2U)
Serial No. 6000001 and Higher (SSM-20N1A)
Serial No. 6001086 and Higher (SSM-20N1E)
Serial No. 6000968 and Higher (SSM-20N1U)
Only the set of IC version 2.00 can perform this adjustment.
1. Input the NTSC color bar signal to the VIDEO IN of LINE-
A.
2. Enter the service mode, and set the adjusting data as the set-
ting below.
La
i
1FF
3. Connect the probe of the oscilloscope to the Q358 emitter .
4. Adjust [DA TRIM | so that the voltage (OUTPUT level) will
become as below.
OUTPUT level!
GND level
V901 v901
(gray CRT) (black CRT)
¢ Refer to SECTION 8. Electrical Parts List on page 71 for
the serial numbers of V901 (CRT).
5. After the adjustment, set the adjusting data of [B CLG], [G
DRIVE] and |G C/O} to the default data, then save the data.
6. Exit the service mode.
2. NTSC COLOR DEMODULATION Adjustment
1. Input the NTSC color bar signal.
2. Select COLOR SELECT is NTSC COMB.
3. Connect the probe of the oscilloscope to Q353 emitter.
4. Adjust the contrast so that the first amplitude becomes
1.0+0.5V.
Within 0.03V
1.0 +0.5Vp-p
a
8.
Enter the service mode.
Adjust so that the height difference between the 2nd
peak and the 3rd peak is less than 0.03V.
Save the data.
Exit the service mode.
3. ANALOG RGB MAX CONTRAST ADJUSTMENT
The adjustment also alters the brightness of OSD.
1.
~
6.
Input a window signal to the LINE-A and the GREEN of
RGB. (Note 1)
0.7Vp-p
jo
10 psec
Set contrast MAX and other settings to the standard level.
Connect the probe of the oscilloscope to the Q357 emitter.
Adjust so that the amplitude of image becomes
the same when LINE-A or RGB is selected.
Save the data.
(Note 1) For the model without RGB, connect pin @ of CN401
(A board) and pin ® of CN802 (S board) with a wire rod.
Exit the service mode.
A BOARD (COMPONENT SIDE)
S BOARD (COMPONENT SIDE)
CN802
7