Samsung SyncMaster T220M User manual

LCD-Monitor
Chassis : LS22TDS / LS20TDS
Model : T220M / T200M
SERVICEManual
TFT-LCD Monitor Contens
T220M / T200M
Refer to the service manual in the GSPN (see the rear cover) for the more information.
1. Precautions
2. Product specications
3. Disassembly and Reassemble
4. Troubleshooting
5. Exploded View & Part List
6. Wiring Diagram
7. Schematic Diagram

Contents
1. Precautions..............................................................................................................1-1
1-1. Safety Precautions .........................................................................................................1-1
1-2. Servicing Precautions.....................................................................................................1-2
1-3. Static Electricity Precautions..........................................................................................1-2
1-4. Installation Precautions ..................................................................................................1-3
2. Product specications............................................................................................ 2-1
2-1. Feature & Specications.................................................................................................2-1
2-2. Spec Comparison to the Old Models..............................................................................2-3
2-3. Accessories ....................................................................................................................2-4
3. Disassembly and Assembly................................................................................... 3-1
3-1. Disassembly ...................................................................................................................3-1
4. Troubleshooting ......................................................................................................4-1
4-1. First Checklist for Troubleshooting................................................................................4-1
4-2. No Power........................................................................................................................4-2
4-3. No Video (Analog PC) ...................................................................................................4-4
4-4. No Video (Digital-HDMI).................................................................................................4-7
4-5. No Picture (Tuner_CVBS) ............................................................................................4-10
4-6. No Picture (AV).............................................................................................................4-13
4-7. No Picture (S-VIDEO)...................................................................................................4-16
4-8. No Picture (Component)...............................................................................................4-19
4-9. No Sound......................................................................................................................4-22
4-10. Faults and Corrective Actions.....................................................................................4-25
4-11. Adjustment..................................................................................................................4-26
4-13. Service Adjustment.....................................................................................................4-27
5. Exploded View & Part List...................................................................................... 5-1
5-1. Exploded View -20”.........................................................................................................5-1
5-2. Parts List.....................................................................................................................................................5-3
5-3. Exploded View -22”.......................................................................................................5-20
5-4. Parts List...................................................................................................................................................5-22
6. Wiring Diagram........................................................................................................6-1
6-1. Wiring Diagram - Main Board.........................................................................................6-1
6-2. Wiring Diagram - IP Board..............................................................................................6-2
6-3. Connector Functions ......................................................................................................6-3
6-4. Cables ............................................................................................................................6-3
7. Schematic Diagram.................................................................................................7-1
7-1. Circuit Descriptions.........................................................................................................7-1
7-2. Block description ............................................................................................................7-2
7-3. Schematic Diagrams ......................................................................................................7-3
7-3-1. Schematic Diagrams (POWER) ..................................................................................7-3
7-3-2. Schematic Diagrams (SOUND) ..................................................................................7-4
7-3-3. Schematic Diagrams -SIGNAL INPUT (HDMI)............................................................7-5
7-3-4. Schematic Diagrams - SIGNAL INPUT (Component).................................................7-6
7-3-5. Schematic Diagrams - Scaler/LVDS Output................................................................7-7
7-3-6. Schematic Diagrams - Tuner.......................................................................................7-8
7-3-7. Schematic Diagrams - PCMCIA..................................................................................7-9
7-3-8. Schematic Diagrams - TV PCMCIA...........................................................................7-10
7-3-9. Schematic Diagrams - SIGNAL INPUT (DVI)............................................................ 7-11

GSPN (Global Service Partner Network)
Area Web Site
North America http://service.samsungportal.com
Latin America http://latin.samsungportal.com
CIS http://cis.samsungportal.com
Europe http://europe.samsungportal.com
China http://china.samsungportal.com
Asia http://asia.samsungportal.com
Mideast & Africa http://mea.samsungportal.com
This Service Manual is a property of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
International and/or domestic law.
© 2008 Samsung Electronics Co.,Ltd.
All rights reserved.
Printed in Korea
P/N: BN82-00479A-00

1-1
1. Precautions
1. Precautions
1-1. Safety Precautions
Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as
electrical shock.
1-1-1. Warnings
For continued safety, do not attempt to modify the circuit board.
Disconnect the AC power and DC power jack before servicing.
1-1-2. Servicing the LCD Monitor
When servicing the LCD Monitor, Disconnect the AC line cord from the AC outlet.
It is essential that service technicians have an accurate voltage meter available at all times. Check the calibration of
this meter periodically.
1-1-3. Fire and Shock Hazard
Before returning the monitor to the user, perform the following safety checks:
Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the
chassis and other metal parts in the monitor.
Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and
compartment covers or shields, isolation resistorcapacitor networks, mechanical insulators, etc.
Leakage Current Hot Check (Figure 1-1):
WARNING : Do not use an isolation transformer during this test.
Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI
C101.1, Leakage Current for Appliances), and Underwriters Laboratories (UL Publication UL1410, 59.7).
With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unit’s AC switch
rst in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit,
etc.) and all exposed metal parts, including: metal cabinets, screwheads and control shafts.
The current measured should not exceed 0.5 milliamp.
Reverse the power-plug prongs in the AC outlet and repeat the test.
1-1-4. Product Safety Notices
Some electrical and mechanical parts have special safetyrelated characteristics which are often not evident from visual
inspection. The protection they give may not be obtained by replacing them with components rated for higher voltage,
wattage, etc. Parts that have special safety characteristics are identied by on schematics and parts lists. A substitute
replacement that does not have the same safety characteristics as the recommended replacement part might create
shock, re and/or other hazards. Product safety is under review continuously and new instructions are issued whenever
appropriate.
1.
2.
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2.
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3.
4.
DEVICE
UNDER
TEST
(READING SHOULD)
NOT BE ABOVE 0.5mA
LEAKAGE
CURRENT
TESTER
TESTALL
EXPOSED METAL
SURFACES
2-WIRE CORD
*ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED) EARTH
GROUND Figure 1-1. Leakage Current Test Circuit

1-2
1. Precautions
1-2. Servicing Precautions
WARNING: An electrolytic capacitor installed with the wrong polarity might explode.
Caution: Before servicing units covered by this service manual, read and follow the Safety Precautions section of
this manual.
Note: If unforeseen circumstances create conict between the following servicing precautions and any of the
safety precautions, always follow the safety precautions.
1-2-1 General Servicing Precautions
Always unplug the unit’sAC power cord from the AC power source and disconnect the DC Power Jack before
attempting to:
(a) remove or reinstall any component or assembly, (b) disconnect PCB plugs or connectors, (c) connect a test
component in parallel with an electrolytic capacitor.
Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes
used. The internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such
elements to their original position.
After servicing, always check that the screws, components and wiring have been correctly reinstalled. Make sure that
the area around the serviced part has not been damaged.
Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels,
input terminals and earphone jacks).
Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON.
Connect an insulation resistance meter (500 V) to theblades of the AC plug.
The insulation resistance between each blade of the AC plug and accessible conductive parts (see above) should be
greater than 1 megohm.
Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the positive lead;
always remove the instrument’s ground lead last.
1-3. Static Electricity Precautions
Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly
called Electrostatically Sensitive Devices (ESD). Examples of typical ESD are integrated circuits and some eld-effect
transistors. The following techniques will reduce the incidence of component damage caused by static electricity.
Immediately before handling any semiconductor components or assemblies, drain the electrostatic charge from your
body by touching a known earth ground. Alternatively, wear a discharging wrist-strap device. To avoid a shock hazard,
be sure to remove the wrist strap before applying power to the monitor.
After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent
accumulation of an electrostatic charge.
Do not use freon-propelled chemicals. These can generate electrical charges sufcient to damage ESDs.
Use only a grounded-tip soldering iron to solder or desolder ESDs.
Use only an anti-static solder removal device. Some solder removal devices not classied as “anti-static” can generate
electrical charges sufcient to damage ESDs.
Do not remove a replacement ESD from its protective package until you are ready to install it. Most replacement ESDs
are packaged with leads that are electrically shorted together by conductive foam, aluminum foil or other conductive
materials.
Immediately before removing the protective material from the leads of a replacement ESD, touch the protective
material to the chassis or circuit assembly into which the device will be installed.
Caution: Be sure no power is applied to the chassis or circuit and observe all other safety precautions.
Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together,
or lifting your foot from a carpeted oor can generate enough static electricity to damage an ESD.
1.
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3.
4.
5.
6.
1.
2.
3.
4.
5.
6.
7.
8.

1-3
1. Precautions
1-4. Installation Precautions
For safety reasons, more than two people are required for carrying the product.
Keep the power cord away from any heat emitting devices, as a melted covering may cause re or electric shock.
Do not place the product in areas with poor ventilation such as a bookshelf or closet. The increased internal
temperature may cause re.
Bend the external antenna cable when connecting it to the product. This is a measure to protect it from being exposed
to moisture. Otherwise, it may cause a re or electric shock.
Make sure to turn the power off and unplug the power cord from the outlet before repositioning the product.Also check
the antenna cable or the external connectors if they are fully unplugged. Damage to the cord may cause re or electric
shock.
Keep the antenna far away from any high-voltage cables and install it rmly. Contact with the highvoltage cable or the
antenna falling over may cause re or electric shock.
When installing the product, leave enough space (10cm) between the product and the wall for ventilation purposes.
A rise in temperature within the product may cause re.
1.
2.
3.
4.
5.
6.
7.

1-4
1. Precautions
Memo

2-1
2. Product specications
2. Product specications
2-1. Feature & Specications
Model T220M / T200M
Feature
Supreme Digital Interface & Networking
- With a built-in with no particular set-top box and provides simple access with a single remote control.
Excellent Picture Quality
- DNIe technology provides life-like clear images.
Dynamic Contrast
- Automatically detects the input visual signal and adjusts to create optimum contrast.
Convenience
-The TV utilizes the HDMI system to implement perfect digital sound and picture quality.
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Specications
Item Description
T220M T200M
LCD Panel TFT-LCD Panel, RGB Vertical strip,
normaly White, 22-Inch viewable,
0.282(H) X 0.282(V)mm Pixel Pitch
TFT-LCD Panel, RGB Vertical strip,
normaly White, 20.1-Inch viewable,
0.258(H) X 0.258(V)mm Pixel Pitch
Scanning Frequency Horizontal : 30KHz ~ 81KHz(Automatic)
Vertical: 56Hz ~ 75Hz(Automatic)
Horizontal :30KHz ~ 81KHz(Automatic)
Vertical:56Hz ~ 75Hz(Automatic)
Display Colors 16.7 Million colors 16.7Million colors
Maximum resolution Horizontal: 1680pixels
Vertical: 1050pixels
Horizontal : 1680pixels
Vertical:1050pixels
Input Signal Analog 0.7Vp-p±10% positive at
75Ω,internally terminated
Analog 0.7Vp-p±10% positive at
75Ω,internally terminated
Input Sync Signal Type: separate H/V,composite
Level : TTL Level
Type: separate H/V,composite
Level : TTL Level
Maximum Pixel Clock rate 146.250MHz 146.250MHz
Active Display
(Horizontal/Vertical) 473.76(H) X 296.1(V) 433.44(H) X 270.9(V)
AC power voltage &
Frequency AC 110 ~ 240V, 50 ~ 60 Hz AC110 ~ 240V, 50 ~ 60Hz
Power Consumption 54W ＜ 2W 50W ＜ 2W
Dimensions Set
(W x D x H)
520x215x441.5mm (After installation stand)
520x86.5x373.5mm (Without stand)
486x215x417.5mm (After installation stand)
486x86x350mm (Without stand)
Weight Set
(After installation Stand) 6.2kg 6.0kg
TV System Tuning Frequency Synthesize
System NT3.58, PAL-M, PAL-N
Sound MONO, STEREO
Environmental Considerations Operating Temperature: 50˚C ~ 104˚F(10˚C ~ 40˚C)
Operating Humidity : 10% ~ 80%
Storage Temperature: -4˚C ~ 113˚C(-20˚C ~ 45˚C)
Storage Humidity: 5% ~ 95%

2-2
2. Product specications
Specications
Item Description
T220M T200M
Antenna Input 75Ω
Sound Characteristic -MAX Internal speaker Out : Right : 3W / Left : 3W
-BASS Control Range : -8 dB ~ + 8dB
-TREBLE Control Range : -8 dB ~ +8 dB
-Headphone Out : 10 mW MAX
-Output Frequency : RF : 80 Hz ~ 15 kHz
A/V : 80 Hz ~ 20 kHz

2-3
2. Product specications
2-2. Spec Comparison to the Old Models
Model T220M / T200M Curie (225MD)
Design
Screen Size 20” / 22” 22”
Frequency
Horizontal
Vertical
Display Color
30 ~ 81 kHz
56 ~ 75 Hz
16,777,216 colors
30 ~ 81 kHz
56 ~ 75 Hz
16,777,216 colors
PC Resolution
Maximum mode WSXGA+, 1680 x 1050 @ 60 Hz 1680 x 1050
Input Signal
Sync Signal
Video Signal
H/V Separate, TTL, P. or N.
0.7 Vp-p @ 75ohm
H/V Separate, TTL, P. or N.
0.7 Vp-p @ 75ohm
Power Consumption
Normal
Power Saving
22” 54W < 2W
20” 50W < 2W 58W < 2W
*Color Effect
- Grey scale: Images are displayed in a grey tone on the screen.
- Green: Images are displayed in a green tone on the screen.
- Aqua: Images are displayed in a blue tone on the screen.
- Sepia: Images are displayed in a brown tone on the screen.
Image Size : : If the resolution is not wide resolution, this option allows the screen size to be selected as normal or wide.

2-4
2. Product specications
2-3. Accessories
Product Description Ccde. No Remark
Remote Control
&
Batteries (AAA x 2)
BN59-00678A
Samsung Electronics
Service center
Power Cord 3903-000190
Stand Body BN96-07347D
Stand Base BN96-07345A
D-Sub Cable BN39-00244G
User’s Guide,
Monitor Driver,
Natural Color Pro Software
BN96-07540A
Cleaning Cloth BN63-01798A

3-1
3. Disassembly andAssembly
3. Disassembly and Assembly
This section describes the disassembly and reassembly sequences for this monitor.
Warning: As this monitor has parts that are sensitive to static electricity, be careful when handling them.
3-1. Disassembly
Caution: 1. Turn the monitor off before beginning the disassembly process.
2. When disassembling the monitor, do not use any metal tools except for the provided jig.
3. Remove the signal cable and the power cord before beginning the disassembly.
Description Photo Screws
1. Place monitor face down on cushioned table.
Remove Stand, then remove 2 marked screws
from the rear cover.
Caution : If you do not tilt the stand and use too
much force to remove it, the connection
pin may break.
2. Remove the cover and the LCD panel using the
provided jig on both grooves at the bottom.
Caution : Remove the cover and the LCD panel
using the provided jig on both grooves
at the bottom.

3-2
3. Disassembly andAssembly
Description Photo Screws
3. Insertaatscrewdriverintothegrooveandthen
lift up and remove the cover.
4. After remove COVER-REAR, then disconnect
SPEAKER , FUNCTION wire.
5. Disconnect LVDS cable from panel.

3-3
3. Disassembly andAssembly
Description Photo Screws
6. After disconnecting SHIELD-LAMP of left side,
disassemble lamp wire between panel and IP
Board.
7. Remove 8 marked SCREW of left picture.
Disconnect IP board.
※Reassembly procedures are in the reverse order
of disassembly procedures.
8. Remove the LCD panel.

3-4
3. Disassembly andAssembly
Description Photo Screws
9. Remove the IR module by tilting the left snap to
the right.
10.Remove the LED module by sliding the snap
designatedintherightgurebackwards.
11. Remove the two (2) screws and then remove the
holders from the four (4) snaps designated in the
rightgureusingtheprovidedjig.

3-5
3. Disassembly andAssembly
Description Photo Screws
12. Remove the two (2) connectors.
Caution : Servicing is not supported for the PCB.
▶Assembly
13.The assembly is in the reverse order of the
disassembly.
14.Connect the disassembled snap and the LED
module again.
15.Fixtheconnectingwirewithlamenttape
Caution : If the wire is damaged when closing the
cover, an operating error may occur.
Therefore, make sure to close the
coverafterxingitwithlamenttape.
lamenttape
※ The assembly is in the reverse order of disassembly.

3-6
3. Disassembly andAssembly
Memo

5-1
5. Exploded View & Part List
5. Exploded View & Part List
5-1. LS20TDSSUMZD - Exploded View (T220M)
T0003
M0215 M0014
M0006
T0279
M0013
M0090
STD
M0027
M0174

5-2
5. Exploded View & Part List
5-1-1. LS20TDSSUMZD - Parts List (T220M)
Location No. Code No. Description & Specication Q’ty SA/SNA Remark
M0006 BN96-08149G ASSY SHIELD P-COVER;LS20TD(ANALOG),SECC 1 S.N.A
M0013 BN96-07447H ASSY COVER P-REAR;LS20TD(ANALOG),PMMAAB 1 S.A
M0014 BN94-01893R ASSY PCB MAIN;LS20TDSSU/ZB 1 S.A
M0027 BN96-07345B ASSY STAND P-BASE;LS22TW,ABS HB PMMA,RD0 1 S.A
M0090 BN96-08016A ASSY SHIELD P-LAMP;LS20TD(MFM),SPTE,T 0. 1 S.N.A
M0174 BN44-00177D IP BOARD;PWI2204ST(A),T 20” MFM,1.4 ~2.8 1 S.A
M0215 BN07-00374A LCD-PANEL;CLAA201WA04 1 S.A
STD BN96-07347D ASSY STAND P-BODY;LS22TD,PMMAABS HB, SM 1 S.A
T0003 BN96-07446L ASSY COVER P-FRONT;LS20TD,BRAZIL,PMMA+AB 1 S.A
T0279 BN63-05063A COVER-JACK;T220MANALOG,ABS + PC,HB,BK26 1 S.N.A

5-3
5. Exploded View & Part List
5-2. LS20TDSSUMZD Parts List
Service Bom (SA: SERVICE AVAILABLE, SNA: SERVICE NOT AVAILABLE)
Level Location No. Code No. Description & Specication Q’ty SA/SNA Remark
LS20TDSSUMZD T200M,WST1/S20A4-LTD,20,LCD-MO,BRAZIL
0.1 M0001 BN90-01634H ASSY COVER FRONT;LS20TD_MFM,TOC,ROSE BLA 1 S.N.A
..2 M0081 6006-001096 SCREW-TAPTITE;BH,+,WP,B,M4.0,L12,ZPC(BLK 4 S.N.A
..2 T0175 BN96-06823C ASSY SPEAKER P;16ohm,T-project,MFM,3W,11 1 S.A
...3 BN83-00813A CKD-SPEAKER;Bordeaux New Rubber,pi 15 x 4 S.N.A
...3 BN83-01026A CKD-SPEAKER;L530 32” Fullrange Sleeve-#1 2 S.N.A
...3 BN83-01027A CKD-SPEAKER;L530 32” Fullrange Sleeve-#1 2 S.N.A
...3 BN83-01322A CKD-SPEAKER;T-MFM Speaker Unit,63mm X 35 2 S.N.A
...3 BN83-01323A CKD-SPEAKER;T-MFM Speaker Holder,95mm X 2 S.N.A
...3 BN83-01324A CKD-SPEAKER;T-MFM Speaker Wire Ass’y,4Pi 1 S.N.A
...3 BN83-01325A CKD-SPEAKER;T-MFM Speaker Cushion,52 X23 2 S.N.A
...3 BN83-01326A CKD-SPEAKER;T-MFM Speaker Label,20mmX10m 1 S.N.A
...3 BN83-00781A CKD-SPEAKER;Bordeax26 Screw,pi3 * 6mm 8 S.N.A
..2 T0003 BN96-07446L ASSY COVER P-FRONT;LS20TD,BRAZIL,PMMA+AB 1 S.A
...3 M0081 6003-000282 SCREW-TAPTITE;BH,+,-,B,M3,L8,ZPC(BLK),SW 2 S.N.A
...3 M0960 BN61-03932A HOLDER-BOSS;T200,PMMA+ABS HB,WH15 1 S.N.A
...3 CCM1 BN63-02183D COVER-SHEET;Rhcm,PE Vinyl,T0.05,680mm,20 1 S.N.A
...3 M0112 BN63-04426X COVER-FRONT;LS20TD(ANALOG),PMMA+ABS,ROSE 1 S.N.A
...3 M0145 BN96-07556D ASSY BOARD P-FUNCTION;T220HD,CT5000-5800 1 S.A
....4 BN94-02473F ASSY PCB MAIN-FUNCTION PCB;LS22TDSSUMZD 1 S.N.A
.....5 M2893 BN39-01051B LEAD CONNECTOR;T-MFM24,UL1571#30,UL1571# 1 S.A
.....5 T0174 BN97-02920J ASSY SMD;LS22TDSSUMZD 1 S.N.A
......6 D3 0406-001172 DIODE-TVS;CDS3C30GTH,48/-/50V,SMD 1 S.A
......6 D4 0406-001172 DIODE-TVS;CDS3C30GTH,48/-/50V,SMD 1 S.A
......6 R6 2007-000070 R-CHIP;0ohm,5%,1/10W,TP,1608 1 S.N.A
......6 R7 2007-000076 R-CHIP;330ohm,5%,1/10W,TP,1608 1 S.A
......6 R1 2007-000121 R-CHIP;820ohm,5%,1/10W,TP,1608 1 S.N.A
......6 R4 2007-000121 R-CHIP;820ohm,5%,1/10W,TP,1608 1 S.N.A
......6 R2 2007-000124 R-CHIP;2.2Kohm,5%,1/10W,TP,1608 1 S.N.A
......6 R5 2007-000124 R-CHIP;2.2Kohm,5%,1/10W,TP,1608 1 S.N.A
......6 C3 2203-000189 C-CER,CHIP;100nF,+80-20%,25V,Y5V,1608 1 S.N.A
......6 C4 2203-000189 C-CER,CHIP;100nF,+80-20%,25V,Y5V,1608 1 S.N.A
......6 T0313 3404-001209 SWITCH-TACT;12VDC,50mA,250gf,4.5x4.5x1.5 1 S.A
......6 T0313 3404-001209 SWITCH-TACT;12VDC,50mA,250gf,4.5x4.5x1.5 1 S.A
......6 T0313 3404-001209 SWITCH-TACT;12VDC,50mA,250gf,4.5x4.5x1.5 1 S.A
......6 T0313 3404-001209 SWITCH-TACT;12VDC,50mA,250gf,4.5x4.5x1.5 1 S.A
......6 T0313 3404-001209 SWITCH-TACT;12VDC,50mA,250gf,4.5x4.5x1.5 1 S.A
......6 T0313 3404-001209 SWITCH-TACT;12VDC,50mA,250gf,4.5x4.5x1.5 1 S.A
......6 T0077 BN41-01011A PCB MAIN;T220HD,FR-4,2L,PCB1.0,1.0T 1 S.N.A
....4 BN94-02473K ASSY PCB MAIN-IR PCB;LS22TDSSUMZD 1 S.N.A
.....5 M2893 BN39-01052B LEAD CONNECTOR;T200HD,UL1571#30,UL,5P,20 1 S.A
.....5 M2893 BN39-01053A LEAD CONNECTOR;T220D,UL1571#30,8P,200mm, 1 S.A
.....5 T0174 BN97-02902J ASSY SMD;LS22TDSSUMZD 1 S.N.A
......6 D1 0403-000510 DIODE-ZENER;MTZJ6.2B,5.96-6.27V,500mW,DO 1 S.A
......6 R1 2001-000290 R-CARBON;10Kohm,5%,1/8W,AA,TP,1.8x3.2mm 1 S.N.A