Miscellaneous Adjustments - Sanyo DS25520 Manual

MISCELLANEOUS ADJUSTMENTS

B+ CHECK B+ CHECK B+ CHECK B+ CHECK B+ CHECK
Connect a digital DC voltmeter to the cathode of D625. Set brightness and picture
to minimum. With AC line set to 120VAC, B+ should read 130V ±2.0V.
HIGH HIGH HIGH V V V V V OL HIGH HIGH OLT T T T T A A A A A GE CHECK OL OL OL GE CHECK GE CHECK GE CHECK GE CHECK
Tune in a picture. Set customer controls to minimum. Connect a high voltage probe
to CRT anode. High voltage should measure 26kV to 28kV.
ENTERING SER ENTERING SER ENTERING SER ENTERING SERVICE MODE ENTERING SER VICE MODE VICE MODE VICE MODE VICE MODE
Disconnect the AC power cord. While pressing the menu button on the front of the
set, connect the AC power cord. Use the channel up and down buttons to select the
service number. Use volume up and down buttons to change the value. Press the
menu button to exit the service mode.
HORIZONT HORIZONT HORIZONT HORIZONTAL HORIZONT AL AL AL AL WIDTH WIDTH WIDTH WIDTH WIDTH
Tune in a crosshatch pattern. Enter the service mode and select service item number
47 EWD. Adjust for the proper horizontal width.
HORIZONT HORIZONT HORIZONT HORIZONT HORIZONTAL POSITION AL POSITION AL POSITION AL POSITION AL POSITION
Tune in a crosshatch pattern. Enter the service mode and select service item number
03 HP. Adjust for the best horizontal centering.
RF A RF A RF A RF AGC DELA RF A GC DELA GC DELA GC DELA GC DELAY Y Y Y Y
Tune in a picture. Enter the service mode and select service number 42 RAD.
Adjust where no snow (noise) appears in picture.
VER VER VERTICAL SIZE VER VER TICAL SIZE TICAL SIZE TICAL SIZE TICAL SIZE
Tune in a crosshatch pattern. Enter the service mode and select service item number
04 VS. Adjust for proper vertical size and best vertical linearity.
VER VER VER VER VERTICAL CENTERING TICAL CENTERING TICAL CENTERING TICAL CENTERING TICAL CENTERING
Tune in a crosshatch pattern. Check that the pattern is centered. If too low, replace
resistor R513 1000 ohms 1/2W with a 470 ohms 1W. If too high, remove resistor
R513 1000 ohms 1/2W.
VCO VCO VCO VCO VCO
VCO must be adjusted after IC101, IC802, or T151 is replaced. Tune in a picture.
Connect positive lead of a digital voltmeter to pin 58 of IC101 and the negative lead
to TE7. Adjust T151 to obtain a reading of 3.6V ± 0.2V.
VIDEO LEVEL VIDEO LEVEL VIDEO LEVEL VIDEO LEVEL VIDEO LEVEL
Tune in a color bar pattern. Set picture and brightness to normal. Connect an
oscilloscope to the emitter of Q202, and the negative lead to ground. Enter the
service mode and select service number 46 VL. Adjust for 1.0Vp-p ±0.1Vp-p
waveform on the oscilloscope.
GRA GRA GRAY SCALE GRA GRA Y SCALE Y SCALE Y SCALE Y SCALE
Tune in an active channel. Enter the service mode. Set the value of service numbers
15 RB, 16 GB, and 17 BB to 0. Set the value of service numbers 18 RD and 20 BD
to 55. Set screen control, color, brightness, and picture to minimum. Adjust screen
control, if necessary, to obtain a barely visible horizontal line. Select service
number 73. Adjust the bias levels for a white line. Select service number 72 DRV
and adjust the drive values for normal black and white picture at all brightness
levels.
SUB BRIGHTNESS SUB BRIGHTNESS SUB BRIGHTNESS SUB BRIGHTNESS SUB BRIGHTNESS
Tune in a color bar pattern. Set picture and brightness to normal. Connect positive
lead of a digital voltmeter to TP51 and the negative lead to TP50. Enter the service
mode and select service number 53 SB. Adjust for 820mV ±10mV.
SUB COLOR, SUB COLOR, SUB COLOR, SUB SUB COLOR, SUB COLOR, SUB SUB SUB TINT SUB TINT TINT TINT TINT, , , , , SUB SHARPNESS SUB SHARPNESS SUB SHARPNESS SUB SHARPNESS SUB SHARPNESS
Tune in a picture. Enter the service mode. Select service number 54 SCO. Adjust for
normal color level. Select service number 55 STI. Adjust for normal flesh tones.
Select service number 56 SSH. Adjust for contrast range.
OSD HORIZONT OSD HORIZONT OSD HORIZONTAL POSITION OSD HORIZONT OSD HORIZONT AL POSITION AL POSITION AL POSITION AL POSITION
Tune in a local channel. Enter the service mode and select service item number 59
HR. Adjust for centered on screen menu.
SOUND SOUND SOUND SOUND SOUND
Tune in a local channel. Connect an oscilloscope to the base of Q135, and the
negative lead to ground. Enter the service mode and select service number 45 FL.
Adjust for 0.693Vp-p ± 0.07Vp-p waveform on the oscilloscope
INPUT LEVEL INPUT LEVEL INPUT LEVEL INPUT LEVEL INPUT LEVEL
Set generator to 1kHz audio frequency and L-R modulating signal. Connect an
oscilloscope to pin 38 of IC3401. Enter service mode and select the service item
number 60 ATT. Adjust for 0.7Vp-p waveform.
SEPARA SEP SEP SEP SEP ARA ARATION ARA ARA TION TION TION TION
Set generator to pilot, 300Hz audio frequency, and left modulating signal. Connect
an oscilloscope to pin 38 of IC3401 and ground. Enter the service mode and select
service number 61 WDB. Adjust for minimum amplitude of the waveform. Set
generator to 8kHz audio frequency. Select service number 62 SPC and adjust for
minimum amplitude of the waveform.
PURITY PURITY PURITY PURITY PURITY
NOTE: Operate the receiver for 15 minutes to allow warm-up of CRT.
Use a degaussing coil to demagnetize the CRT. Tune in a green raster. Loosen the
clamp screw. Slide deflection yoke back as far as possible. Adjust purity tabs to
center the vertical green band. Slide the deflection yoke forward to produce a
uniform green screen. Tighten the clamp screw.
CONVERGENCE CONVERGENCE CONVERGENCE CONVERGENCE CONVERGENCE
Tune in a dot pattern. Loosen the clamp screw. Adjust the 4 pole magnets to
converge the red and blue dots at the center of the screen. Adjust the 6 pole magnets
to converge the red/blue dots over the green dots at the center of the screen.
NOTE: Rotate the two tabs of each set of magnets equally and opposite to converge
vertically and rotate both tabs in the same direction to converge horizontally. The 4
and 6 pole magnets interact, repeat adjustment until center convergence is correct.
Tune in a crosshatch pattern. Remove the tilt adjustment wedges between deflection
yoke and the CRT. Loosen the clamp screw. Tilt the deflection yoke up or down to
converge the vertical lines at the top and bottom of the screen and the horizontal
lines at the right and left sides of the screen. Tilt the deflection yoke to the right or
left to converge the horizontal line at the top and bottom of the screen and the
vertical line at the right and left sides of the screen. Repeat convergence procedure
if necessary to obtain best overall convergence. Replace the tilt adjustment wedges.
Tighten the clamp screw.
CR CRT NECK ASSEMBL CR CR CR T NECK ASSEMBL T NECK ASSEMBL T NECK ASSEMBLY Y Y Y Y T NECK ASSEMBL
IC802 REPLA IC802 REPLA IC802 REPLACEMENT IC802 REPLA IC802 REPLA CEMENT CEMENT CEMENT CEMENT
Perform the following adjustments after replacing IC802. Enter the service mode,
select service number 03 HP and set value to 14. Select service number 07 VLN and
set value to 13. Select service number 28 PRE and set value to 3. Select service
number 37 AF and set value to 1. Select service number 57 OPT and set value to
100. Select service number 58 OP2 and set value to 32. Press the menu button to
exit service mode.
SERVICE MODE ADJUSTMENT CHART
Ser Service Ser Ser Ser vice vice vice vice V V V V V alue alue alue alue alue Initial Ref Initial Ref Initial Ref Initial Ref Initial Ref
No. No. No. No. No. Adjustment Adjustment Adjustment Adjustment Adjustment Range e e e e Rang Rang Rang Rang V V V V V alue alue alue alue alue
01 HFR 0 - 63 29
02 AFC 0, 1 0
03 HP 0 - 31 15
04 VS 0 - 127 64
05 VPO 0 - 63 5
06 VSP 0, 1 0
07 VLN 0 - 31 18
08 CRS 0 - 3 0
09 GRY 0, 1 1
10 VSC 0 - 31 8
11 HBR 0 - 7 3
12 HBL 0 - 7 4
13 CDM 0, 1 0
14 VC 0 - 7 7
15 RB 0 - 255 0
16 GB 0 - 255 0
17 BB 0 - 255 0
18 RD 0 - 127 64
19 GD 0 - 15 8
20 BD 0 - 127 64
21 SBI 0 - 127 48
22 OSD 0 - 3 3
23 POS 0, 1 0
24 FLS 0 - 7 1
25 CKO 0 - 7 3
26 GYA 0, 1 0
27 CRG 0 - 3 2
28 PRE 0 - 3 1
29 WP 0, 1 0
30 FSW 0, 1 0
31 VBL 0, 1 0
32 BSG 0 - 3 2
33 BSS 0 - 3 1
34 DCR 0 - 3 1
35 YGM 0 - 3 1
36 CBP 0, 1 0
37 AF 0, 1 0
38 BAT 0 - 7 4
39 MSD 0, 1 0
40 ABL 0, 1 0
41 RYA 0 - 15 2
42 RAD 0 - 63 15
43 IAS 0, 1 0
44 FMM 0, 1 0
45 FL 0 - 31 15
46 VL 0 - 7 4
47 EWD 0 - 63 39
48 EWA 0 - 63 30
49 EWT 0 - 63 34
50 EWP 0 - 7 7
51 EWB - 8
52 HSC - 7
53 SB 0 - 63 32
54 SCO 0 - 31 7
55 STI 0 - 31 20
56 SSH 0 - 15 12
57 OPT 0 - 255 0
58 OP2 0 - 255 0
59 HR 0 - 63 27
60 ATT 0 - 15 10
61 WDB 0 - 63 32
62 SPC 0 - 63 32
63 SBO 0 - 255 5
64 PCO 0 - 63 40
65 PTI 0 - 63 40
66 PUV 0 - 63 24
67 PDV 0 - 255 147
68 PLH 0 - 63 10
69 PRH 0 - 255 101
70 PCN 0 - 63 42
71 PBS 0 - 63 15
72 DRV 0 - 127 64
DRV 0 - 127 64
73 - 0 - 255 0
- 0 - 255 0
- 0 - 255 0
74 R00
Thru Thru
146 R72 0 - 255 -
Initial Set Initial Set Initial Set Initial Set Initial Set On-Set On-Set On-Set On-Set On-Set
Up Up V V V V V alue Up Up Up alue alue alue alue V V V V V alue alue alue alue alue Notes Notes Notes Notes Notes
29 29 Horizontal Frequency
0 0 AFC Gain
14 14 H-Position (H-Centering)
64 51 Vertical Size
5 5 Vertical Position
0 0 Vertical Set Up
13 13 Vertical Linearity
0 0 Cross B/W
1 1 Gray Mode
8 8 Vertical S Correction
3 3 H BLK R
4 4 H BLK L
0 0 CD Mode
7 7 Vertical Compression
0 0 Red Bias
0 0 Green Bias
0 7 Blue Bias
64 85 Red Drive
8 8 Green Drive
64 62 Blue Drive
48 48 Sub Bias
3 3 OSD Contrast
0 0 Pre/Over/SW
1 1 Filter System
3 3 Color Killer Operation
0 0 G-Y Angle
2 2 Coring Gain
3 3 Pre Shoot Adjust
1 1 White Peak Limiter, 0 = On, 1 = Off
0 0 FBP Blanking Switch
0 0 Vertical Blanking Switch
2 2 Black Stretch Gain
1 1 Black Stretch Start
1 1 DC Reset
1 1 Y Gamma
0 0 C Bypass
1 1 Auto Flesh, 0 = Off, 1 = On
4 4 Bright ABL Threshold
0 0 Mid Stop Def
0 0 ABL Defeat, 0 = On, 1 = Off
2 2 R-Y/B-Y Angle
15 37 RF AGC Delay
0 0 IF AGC Switch, 0 = TV (Normal), 1 = AV (IF Gain Minimum)
0 0 FM Mute
15 10 FM Level
4 5 Video Level
39 39 EW DC
30 30 EW Amp
34 34 EW Tilt
7 7 EW Corner Top
8 8 EW Corner Bottom
7 7 Horiz Size Comp
32 31 Sub Brightness
7 7 Sub Color
20 20 Sub Tint
12 12 Sub Sharpness
100 100 Option, data 1 should be set to 100, in binary 8 bit 01100100
32 32 Option, data 2 should be set to 32, in binary 8 bit 0 0100000
27 27 OSD Horizontal Position
7 8 Attenuation
32 34 Wide Band
32 11 Spectral
5 5 Sub Bright Offset
40 40 PIP Color
40 40 PIP Tint
24 24 PIP Top Position
147 147 PIP Bottom Position
10 10 PIP Left Position
101 101 PIP Right Position
42 52 PIP Y Level
15 15 PIP BGP Phase
64 R 85 Red Drive, press 1 to decrease value and 3 to increase value.
64 B 62 Blue Drive, press 7 to decrease value and 9 to increase value.
0 0 Red Bias, press 1 to decrease value and 3 to increase value.
0 0 Green Bias, press 4 to decrease value and 6 to increase value.
0 0 Blue Bias, press 7 to decrease value and 9 to increase value.
0 0 -
SET 4737 SET 4737 SET 4737 Pa a a a a g g g g g e 1 P P e 1 e 1 e 1
SET 4737 SET 4737 P P e 1