VHF High Band voltages taken on channel 7.
UHF Band voltages taken on channel 14.
VV
OLOL
TT
AA
V
VV
w Bandw Band
w Band
w Bandw Band
Test equipment listed by participating manufacturer illustrates typical or equivalent equipment used by Sams engineers to obtain
measurements. This equipment is compatible with most types used by field service technicians.
EquipmentEquipment
Equipment
EquipmentEquipment
OscilloscopeSC3100
Generators
RGBCM2125
Multiburst SignalVG91
Color BarVG91
TV StereoVG91
Digital VOMSC3100
Frequency MeterSC3100
Hi-Voltage ProbeHP200
Accessory ProbesTP212
GE CHARGE CHAR
OL
T
A
GE CHAR
OLOL
TT
AA
GE CHARGE CHAR
VHF High BandVHF High Band
VHF High Band
VHF High BandVHF High Band
TT
T
TT
UHF BandUHF Band
UHF Band
UHF BandUHF Band
TEST EQTEST EQ
TEST EQ
TEST EQTEST EQ
Sencore No.Sencore No.
Sencore No.
Sencore No.Sencore No.
TUNER TUNER
TUNER
TUNER TUNER
TERMINAL GUIDETERMINAL GUIDE
TERMINAL GUIDE
TERMINAL GUIDETERMINAL GUIDE
t
t
(4)
t
t
(6)
t
t
t
t
UIPMENTUIPMENT
UIPMENT
UIPMENTUIPMENT
EquipmentEquipment
Equipment
EquipmentEquipment
Isolation TransformerPR570
Capacitance AnalyzerLC102
CRT AnalyzerCR7000
AC Leakage TesterPR570
Inductance AnalyzerLC102
Flyback Yoke TesterTVA92
Field Strength MeterSL753
Transistor TesterTF46
Horizontal AnalyzerHA-2500
Video AnalyzerVG91, TVA92
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
VV
OLOL
TT
AA
HIGH
V
HIGH HIGH
VV
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 SERENTERING SER
ENTERING SER
ENTERING SERENTERING SER
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.
HORIZONTHORIZONT
HORIZONT
HORIZONTHORIZONT
Tune in a crosshatch pattern. Enter the service mode and select service item number
47 EWD. Adjust for the proper horizontal width.
HORIZONTHORIZONT
HORIZONT
HORIZONTHORIZONT
Tune in a crosshatch pattern. Enter the service mode and select service item number
03 HP. Adjust for the best horizontal centering.
RF ARF A
GC DELAGC DELA
RF A
GC DELA
RF ARF A
GC DELAGC DELA
Tune in a picture. Enter the service mode and select service number 42 RAD.
Adjust where no snow (noise) appears in picture.
VERVER
TICAL SIZETICAL SIZE
VER
TICAL SIZE
VERVER
TICAL SIZETICAL 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.
VERVER
TICAL CENTERINGTICAL CENTERING
VER
TICAL CENTERING
VERVER
TICAL CENTERINGTICAL 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.
VCOVCO
VCO
VCOVCO
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 LEVELVIDEO LEVEL
VIDEO LEVEL
VIDEO LEVELVIDEO 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.
GRAGRA
Y SCALEY SCALE
GRA
Y SCALE
GRAGRA
Y SCALEY 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 BRIGHTNESSSUB BRIGHTNESS
SUB BRIGHTNESS
SUB BRIGHTNESSSUB 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 COLOR,SUB COLOR,
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 HORIZONTOSD HORIZONT
OSD HORIZONT
OSD HORIZONTOSD HORIZONT
Tune in a local channel. Enter the service mode and select service item number 59
HR. Adjust for centered on screen menu.
GE CHECKGE CHECK
OL
T
A
GE CHECK
OLOL
TT
AA
GE CHECKGE CHECK
AL AL
WIDTHWIDTH
AL
WIDTH
AL AL
WIDTHWIDTH
AL POSITIONAL POSITION
AL POSITION
AL POSITIONAL POSITION
YY
Y
YY
SUB SUB
SUB
SUB SUB
VICE MODEVICE MODE
VICE MODE
VICE MODEVICE MODE
TINTTINT
,,
SUB SHARPNESS SUB SHARPNESS
TINT
,
SUB SHARPNESS
TINTTINT
,,
SUB SHARPNESS SUB SHARPNESS
AL POSITIONAL POSITION
AL POSITION
AL POSITIONAL POSITION
SOUNDSOUND
SOUND
SOUNDSOUND
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 LEVELINPUT LEVEL
INPUT LEVEL
INPUT LEVELINPUT 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.
SEPSEP
ARAARA
SEP
SEPSEP
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 n umber 62 SPC and adjust for
minimum amplitude of the waveform.
PURITYPURITY
PURITY
PURITYPURITY
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.
CONVERGENCECONVERGENCE
CONVERGENCE
CONVERGENCECONVERGENCE
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.
CRCR
CR
CRCR
IC802 REPLAIC802 REPLA
IC802 REPLA
IC802 REPLAIC802 REPLA
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.
TIONTION
ARA
TION
ARAARA
TIONTION
T NECK ASSEMBLT NECK ASSEMBL
T NECK ASSEMBL
T NECK ASSEMBLT NECK ASSEMBL
CEMENTCEMENT
CEMENT
CEMENTCEMENT
YY
Y
YY
SERVICE MODE ADJUSTMENT CHART
SerSer
vicevice
Ser
vice
SerSer
No.No.
No.
No.No.
01HFR0 - 6329292 9Horizontal Frequency
02AFC0, 1000AFC Gain
03HP0 - 31151414H-Position (H-Centering)
04VS0 - 127646451Vertical Size
05VPO0 - 63555Vertical Position
06VSP0, 1000Vertical Set Up
07VLN0 - 31181313Vertical Linearity
08CRS0 - 3000Cross B/W
09GRY0, 1111Gray Mode
10VSC0 - 31888Vertical S Correction
11HBR0 - 7333H BLK R
12HBL0 - 7444H BLK L
13CD M0, 1000CD Mode
14VC0 - 7777Vertical Compression
15R B0 - 255000Red Bias
16GB0 - 255000Green Bias
17B B0 - 255007Blue Bias
18RD0 - 12764648 5Red Drive
19GD0 - 15888Green Drive
20BD0 - 127646462Blue Drive
21SBI0 - 127484848Sub Bias
22OSD0 - 3333OSD Contrast
23POS0, 1000Pre/Over/SW
24FLS0 - 7111Filter System
25CKO0 - 7333Color Killer Operation
26GYA0, 1000G-Y Angle
27CRG0 - 3222Coring Gain
28PRE0 - 3133Pre Shoot Adjust
29WP0, 1011White Peak Limiter, 0 = On, 1 = Off
30FSW0, 1000FBP Blanking Switch
31VBL0, 1000Vertical Blanking Switch
32BSG0 - 3222Black Stretch Gain
33BSS0 - 3111Black Stretch Start
34DCR0 - 3111DC Reset
35YGM0 - 3111Y Gamma
36CB P0, 1000C Bypass
37AF0, 1011Auto Flesh, 0 = Off, 1 = On
38BAT0 - 7444Bright ABL Threshold
39MSD0, 1000Mid Stop Def
40ABL0, 1000ABL Defeat, 0 = On, 1 = Off
41RYA0 - 15222R-Y/B-Y Angle
42RAD0 - 63151537RF AGC Delay
43IAS0, 1000IF AGC Switch, 0 = TV (Normal), 1 = AV (IF Gain Minimum)
44FM M0, 1000FM Mute
45FL0 - 31151510FM Level
46VL0 - 7445Video Level
47EWD0 - 63393939EW DC
48EWA0 - 63303030EW Amp
49EWT0 - 63343434EW Tilt
50EWP0 - 7777EW Corner Top
51EWB-888EW Corner Bottom
52HSC-777Horiz Size Comp
53SB0 - 63323 231Sub Brightness
54SCO0 - 31777Sub Color
55STI0 - 31202020Sub Tint
56SSH0 - 15121212Sub Sharpness
57OPT0 - 2550100100Option, data 1 should be set to 100, in binary 8 bit 01100100
58OP20 - 25503232Option, data 2 should be set to 32, in binary 8 bit 0 0100000
59HR0 - 63272727OSD Horizontal Position
60ATT0 - 151078Attenuation
61WDB0 - 63323234Wide Band
62SPC0 - 63323211Spectral
63SBO0 - 255555Sub Bright Offset
64PCO0 - 63404040PIP Color
65PTI0 - 63404040PIP Tint
66PUV0 - 63242 424PIP Top Position
67PDV0 - 255147147147PIP Bottom Position
68PLH0 - 63101 010PIP Left Position
69PRH0 - 25510110 1101PIP Right Position
70PCN0 - 63424252PIP Y Level
71PBS0 - 63151515PIP BGP Phase
72DRV0 - 1276464R 85Red Drive, press 1 to decrease value and 3 to increase value.
73-0 - 255000Red Bias, press 1 to decrease value and 3 to increase value.
74R00
ThruThru
146R720 - 255-00-
vicevice
AdjustmentAdjustment
Adjustment
AdjustmentAdjustment
DRV0 - 1276464B 62Blue Drive, press 7 to decrease value and 9 to increase value.
-0 - 255000Green Bias, press 4 to decrease value and 6 to increase value.
-0 - 255000Blue Bias, press 7 to decrease value and 9 to increase value.
VV
aluealue
V
alue
VV
aluealue
RangRang
Rang
RangRang
Initial RefInitial Ref
Initial Ref
ee
e
ee
Initial RefInitial Ref
VV
aluealue
V
alue
VV
aluealue
Initial SetInitial Set
Initial Set
Initial SetInitial Set
Up Up
VV
aluealue
Up
V
alue
Up Up
VV
aluealue
On-SetOn-Set
On-Set
On-SetOn-Set
VV
aluealue
V
alue
VV
aluealue
NotesNotes
Notes
NotesNotes
Page 4
SANY
SANYSANY
SANYSANY
O MODEL DS25520 (CHASSIS 25520-00/01)
O MODEL DS25520 (CHASSIS 25520-00/01)O MODEL DS25520 (CHASSIS 25520-00/01)
O MODEL DS25520 (CHASSIS 25520-00/01)O MODEL DS25520 (CHASSIS 25520-00/01)
SET 4737 PSET 4737 P
SET 4737 P
SET 4737 PSET 4737 P
aa
gg
e 1e 1
a
g
e 1
aa
gg
e 1e 1
Page 5
PP
aa
gg
e 2e 2
g
e 2
gg
e 2e 2
SET 4737 SET 4737
SET 4737
SET 4737 SET 4737
P
a
PP
aa
Page 6
SET 4737 PSET 4737 P
SET 4737 P
SET 4737 PSET 4737 P
aa
gg
e 2e 2
a
g
e 2
aa
gg
e 2e 2
Page 7
PP
aa
gg
e 2e 2
a
g
e 2
aa
gg
e 2e 2
SET 4737 SET 4737
SET 4737
SET 4737 SET 4737
P
PP
Page 8
SANY
SANYSANY
SANYSANY
O MODEL DS25520 (CHASSIS 25520-00/01)
O MODEL DS25520 (CHASSIS 25520-00/01)O MODEL DS25520 (CHASSIS 25520-00/01)
O MODEL DS25520 (CHASSIS 25520-00/01)O MODEL DS25520 (CHASSIS 25520-00/01)
# For SAFETY use only equivalent replacement part.
(1) Used in chassis 25520-00.
(2) Used in chassis 25520-01.
(3) Screen and focus controls are part of T402.
n The parts listed here are those not usually available from a well-stocked supply cabinet or bin.
n Where items may be replaced with equivalent parts, several alternates are shown from
Function/RatingFunction/Rating
Function/Rating
Function/RatingFunction/Rating
Power645 051 4951-
Fuse Holder645 000 5077For F601 (2 Used)
Magnet610 217 7794Purity/Convergence
PC Board (1)610 295 5965CRT
PC Board (2)610 296 1553CRT
PC Board (1)610 295 5958Main
PC Board (2)610 296 1546Main
Transmitter645 053 8698Remote
Wedge610 117 0154Yoke Positioning (3 Used)
ImporImpor
tant Ptant P
Impor
tant P
ImporImpor
tant Ptant P
arar
ar
arar
MfrMfr
Mfr
MfrMfr
ts Infts Inf
ts Inf
ts Infts Inf
..
P P
arar
t No.t No.
.
P
ar
t No.
..
P P
arar
t No.t No.
ormationormation
ormation
ormationormation
NotesNotes
Notes
NotesNotes
participating vendors.
n On the parts lists, safety items are marked with a
# #
# to remind you that only exact replacements
# #
are recommended for these items.
n When ordering parts, state the model number, part number, and description.
Obtaining PObtaining P
Obtaining P
Obtaining PObtaining P
arar
ar
arar
tsts
ts
tsts
Many of these parts are available from your local Sams authorized distributor or the manufacturer
of the equipment. Call Sams for the name of your nearest distributor:
800-428-7267
Or consult the Sams
Information on test equipment and replacement parts is listed in these pages for the following
participating vendors. Consult the Sams
n NTE Electronics, Inc. (NTE)n Sencore, Inc.
Annual Index
for the address of the original equipment manufacturer.
PP
arar
ticipating ticipating
P
ar
ticipating
PP
arar
ticipating ticipating
Annual Index
VV
endorendor
endor
endorendor
ss
s
ss
V
VV
for their current address.
SANY
SANYSANY
SANYSANY
O MODEL DS25520 (CHASSIS 25520-00/01)
O MODEL DS25520 (CHASSIS 25520-00/01)O MODEL DS25520 (CHASSIS 25520-00/01)
O MODEL DS25520 (CHASSIS 25520-00/01)O MODEL DS25520 (CHASSIS 25520-00/01)
SET 4737 PSET 4737 P
PP
aa
gg
e 4e 4
g
e 4
gg
e 4e 4
SET 4737 SET 4737
SET 4737
SET 4737 SET 4737
P
a
PP
aa
SET 4737 P
SET 4737 PSET 4737 P
aa
gg
e 4e 4
a
g
e 4
aa
gg
e 4e 4
Loading...
+ hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.