Zenith SMS2549, SMS2550S Service Manual

E:fact® Technical Service Data

INDEX

Parts List

Coils & Transformers
Miscellaneous
Controls & Resistors
Capacitors & Electrolytics
Cabinet Parts
Semiconductors, 2 pages

Schematics ................... Location

Television ................. 2A, 2B

Television ................. 2C, 2D

Power Supply .................. 2E

System Control ............ 1A, 1B

Tuner ...................... 1C, 1D

Placement Chart

ZENITH

Models

SMS2549S
SMS2549SM
SMS2550S

SCHEMATIC NOTES

For SAFETY use only equivalent replacement part,

see parts list.

Circuitry not used in some versions.

To purchase a complete paper version
of this service manual, order

®

PHOTOFACT

set #3503

To place the order, contact your local
Sams Distributor or call our Customer
Service operation at 1-800-428-7267.

For E:fact ordering or information,
use the following web site link.

http://www.hwsams.com/efact.html

Product #083503
© Copyright 1999

Howard W. Sams & Co. All rights reserved.

Circuitry used in some versions.
Ground
Chassis ground
Common tie point
Taken from common tie point
Schematic voltage source tie point.

3

Cabling: Heavy lines reduce use of multiple lines.

A

Waveforms and voltages are taken from ground, unless

noted otherwise.

Waveforms taken with triggered scope and keyed rainbow

generator. Waveform voltage is peak to peak. Timebase

is per division. Waveforms shown at 10 divisions.
Supply voltages maintained as seen at input.
Voltages measured with digital meter and a 1000µV RF

signal, with colorbar pattern, applied to antenna terminal.
Controls adjusted for normal operation.
Capacitors are 50 volts or less, 5% or greater unless noted.
Electrolytic capacitors are 50 volts or less,

20% or greater unless noted.
Resistors are 1/2W or less, 5% or greater unless noted.
Value in ( ) used in some versions.
Measurements with switching as shown, unless noted.
Rated voltage shown on zener diodes.

PARTS LIST

COILS & TRANSFORMERS

Item No. Function/Rating Mfr. Part No.

DY1 Yoke 100° 95-3608-04

Horiz .79mH

Vert 10mH
L1200 22µH 20-4277-26A
L1201 AFT 20-4172-12A
L1202 Video Detector 20-4172-05A
L1203 Audio Detector 20-4278B
L1205 .82µH 20-4277-09A
L2101 - ­L2200 16µH 20-4277-24A
L2202 12µH 20-4277-40A
L2203 - ­L3000 Degaussing 20-4330-19
L3201 Horizontal Linearity 20-4073-03
L3206 Ferrite Bead ­L3208 68µH 20-309-22A
L3299 Ferrite Bead 149-576-01

COILS & TRANSFORMERS continued

Item No. Function/Rating Mfr. Part No.

L3412 Ferrite Bead 149-576-01
L3413 - 20-4201
L3414, 15 Ferrite Bead 149-576
L3499 Ferrite Bead ­L5500 120µH 20-3907-25A
L6000 1µH 20-4277-10A
L6001 - ­L6012 10µH 20-3907-12A
L6090 68µH 20-3907-22A

# LX3401
# TX3200
# TX3201 Horizontal Driver 95-4445

# TX3410 Regulator 95-4443

TUNER

L3 - 20-4470-03
L4 - 20-4470-05
L5 - 20-4470-06
L6 - 20-4470-07
L7 - 20-4470-08
L8 - 20-4470-09
L9 - 20-4470-10
L10 - 20-4470-11
L13 - 20-4470-02
L14 - 20-4470
L15 - 20-4470-13
L16 - 20-4470-12
L17 - 20-4470-02
L19 - 20-4470-14
L22 - 20-4470-15
L23 - 20-4470-16
L30 - 20-4470-17
L100 - 20-4470-27

L101 - 20-4328-46

L102 - 20-4442
L103, 04 - 20-4470-01
L106 - 20-4470-19
L107 - 20-4470-20
L108 - 20-4470-21
L109 - 20-4470-22
L111 - 20-4470-23
L112 - 20-4470-24
L113 - 20-4470-25
L114 .22µH 20-4277-60A
L117 - 20-4470-26
L118 3.3µH 20-4277-16A
L149 1.0µH 20-4277-10A

Line Choke 95-3868-02

(1) Horizontal Output 95-4430

Horizontal Driver 95-4442

- 20-4325-01

- 20-4470-18

# For SAFETY use only equivalent replacement part.

(1) Focus and screen (G-2) controls are part of TX3200.

PARTS LIST continued

MISCELLANEOUS

Item No. Description Mfr. Part No. Notes

CR2200 Crystal 224-27A 3.58MHz
CR2212 Resonator 224-131 503kHz
CR6000 Crystal 224-157A 12.083916MHz
CRT1 Socket 78-3394 CRT

# FX3499 Fuse 136-113-23A 4Amp, 250V, Normal Lag

IR1 Receiver 162-35 Remote

# KX3401 Relay 195-158 Degaussing

P3400 Line Cord A-17339 AC, Polarized
SP1 Speaker 49-1368-03 2" X 5", 8 Ohms, 5W
SW1 Switch 85-1691A Off/On
SW2 Switch 85-1691A Channel Up
SW3 Switch 85-1691A Channel Down
SW4 Switch 85-1691A Volume Up
SW5 Switch 85-1691A Volume Down
SW6 Switch 85-1691A Menu
SW7 Switch 85-1691A Select
SW8 Switch 85-1691A Adjust Right
SW9 Switch 85-1691A Adjust Left
SW10 Switch 85-1691A Enter
TU6000 Tuner (1) 175-2402 UHF/VHF
U1200 Filter 224-54A 4.5MHz
U1201 Trap 224-160 SAW
U2200 Delay Line 105-218 ­U2201 Filter 224-23 4.5MHz
V1 CRT - A63ADG31X

Balun A-14323 Antenna
Fuse Holder 19-840-02 For FX3499 (2 Used)
Magnet A-7690-05 Purity/Convergence
PC Board (1) A-17931 Keyboard
PC Board (1) 9-1458-01 Main
Transmitter 124-185-06 Remote
Transmitter 124-157-37 Remote, Used in model SMS2550S
Wedge 152-338 Yoke Positioning (3 Used)

TUNER

XT1 Crystal 224-138 4MHz

# For SAFETY use only equivalent replacement part.

(1) Contact PTS Electronics Corporation for replacement; order by manufacturer's part number.

PARTS LIST continued

CONTROLS & RESISTORS

Item No. Function/Rating Mfr. Part No. NTE Part No.

R1208 5000 RF AGC 63-11007-25 ­R2106 10K Vertical Size 63-11007-27 ­R3201 2200 5% 2W - 2W222

4700 5% 3W 63-11164-88A 3W247

R3419 1000 5% 10W Wirewound 63-10458-96 10W210

820 5% 7W Wirewound 63-10449-94A -

R5509 1000 Blue Gain - -

2000 Blue Gain 63-10857-31 -

R5510 1000 Red Gain - -

2000 Red Gain 63-10857-11 -

R5511 1000 Green Gain - -

2000 Green Gain 63-10857-32 ­R6068 5100 2% 1/4W 63-10233-89 QW251
R6069, 70 1000 2% 1/4W 63-10233-72 QW210

# RX806
# RX807
# RX809 10 5% 1/2W 63-10565-24C HW010
# RX810 1 5% 1/4W 63-10559 QW1D0
# RX2260 820 5% 1/8W 63-10979-45 EW182
# RX2261 3300 5% 1/8W 63-10979-59 EW233
# RX2263 5.6 5% 1/8W 63-10980-35 EW5D6
# RX2264 4700 5% 1/8W - -

# RX2265 3900 5% 1/8W - -

# RX2266 3300 5% 1/8W 63-10979-59 EW233
# RX3401 2.2M 10% 1/2W - HW522

# RX3402 1000 5% 1/4W 63-10235-72 QW210
# RX3410 56K 5% 1/2W 63-11088-14 HW356
# RX3411 56K 5% 1/4W 63-10236-14 QW356
# RX3412 680 5% 1/4W 63-10235-68 QW168
# RX3413 100 5% 1/4W 63-10235-48 QW110
# RX3414 56K 5% 1/2W 63-11088-14 HW356
# RX3415 56.2K 1% 1/2W 63-11082-72 -
# RX3417 3730 1% 1/4W - -

# RX3421 1.8 5% 2W - 2W1D8

# RX3425 1 5% 5W Wirewound 63-10442-24A 5W1D0
# RX3449 220K 5% 1/2W 63-11088-28 HW422
# RX3450 1 5% 1/2W 63-10565 HW1D0
# RX3475 250 B+ 63-10857-34 -
# RX3480 1.5 5% 5W Wirewound 63-10442-28A 5W1D5
# RX3497 12.8 Cold PTC 63-10710A -

1000 5% 1/4W - QW210

1 5% 1/4W 63-10559 QW1D0

2200 5% 1/8W 63-10979-55 -

2400 5% 1/8W 63-10979-56 -

5.6M 20% 1/2W 63-11182 HW556

3400 1% 1/4W 63-10936-59 -

1.2 5% 2W 63-10420-26 2W1D2

# For SAFETY use only equivalent replacement part.

PARTS LIST continued

CAPACITORS & ELECTROLYTICS

Item No. Rating Mfr. Part No.

C1218 18pF 5% 50V NPO 22-8241-16A
C1219 68pF 5% 50V NPO 22-8241-30A
C1220 30pF 5% 50V N150 22-8245-21A
C1221 7pF ±.5pF 50V NPO 22-8241-07A
C2205 1µF 20% 50V NP 22-8190-01A
C3209 470pF 10% 500V NPO 22-7786-10C
C3221 220pF 3kV ­C3416 .001 10% 1kV -

.001 10% 500V 22-7786C
C3472 .001 10% 1kV 22-7811A
C5503 .001 10% 2kV 22-7523
C5504 .01 +80% -20% 1.5kV 22-7755
C6093 .01 10% 50V N075 22-8257-24A
C9717 1µF 50V NP -

# CX804 1000µF 20% 25V 22-8310-16
# CX2223 4.7µF 20% 50V 22-8312-07A
# CX2224 47µF 20% 25V 22-8310-11A
# CX3203 .019 3% 1.6kV 22-8229-41
# CX3210 530pF 10% 3kV 22-8063
# CX3402 .47 5% 250V 22-7876-20
# CX3410 .001 10% 1kV 22-7811A
# CX3411 1µF 20% 100V -

1µF 20% 50V 22-8312-04A

# CX3412 330µF 20% 25V 22-8310-14
# CX3413, 14 220µF 20% 160V -

47µF 20% 160V 22-8315-11

# CX3418 .001 10% 1kV 22-7786C

.001 10% 500V 22-7786C

# CX3425 .0047 20% 22-7431-06
# CX3449 470µF 20% 200V 22-7819-10
# CX3474 2200µF 20% 16V 22-8309-17
# CX3499 .0047 20% 22-7431-06

TUNER

C2, 4, 7 .001 +130% -0% 50V Feedthru 22-7894-06
C9 82pF 10% 50V Feedthru 22-7993-06
C10, 11 .001 +80% -20% 50V Feedthru 22-8304-02
C13, 14 43pF 10% 50V Feedthru 22-8303-03

# For SAFETY use only equivalent replacement part.