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DT1900-C

SERVICE MANUAL
COLOR TELEVISION RECEIVER

ORIGINAL
MFR'S VERSION A

Design and specifications are subject to change without notice.
SERVICING NOTICES ON CHECKING
1. KEEP THE NOTICES 6. AVOID AN X-RAY
As for the places which need special attentions, Safety is secured against an X-ray by consider-
they are indicated with the labels or seals on the ing about the cathode-ray tube and the high
cabinet, chassis and parts. Make sure to keep the voltage peripheral circuit, etc.
indications and notices in the operation manual. Therefore, when repairing the high voltage pe-
2. AVOID AN ELECTRIC SHOCK ripheral circuit, use the designated parts and
There is a high voltage part inside. Avoid an make sure not modify the circuit.
electric shock while the electric current is Repairing except indicates causes rising of high
flowing. voltage, and it emits an X-ray from the cathode-
ray tube.
3. USE THE DESIGNATED PARTS
The parts in this equipment have the specific 7. PERFORM A SAFETY CHECK AFTER
characters of incombustibility and withstand SERVICING
voltage for safety. Therefore, the part which is
replaced should be used the part which has Confirm that the screws, parts and wiring which
the same character. were removed in order to service are put in the
Especially as to the important parts for safety original positions, or whether there are the
which is indicated in the circuit diagram or the portions which are deteriorated around the
table of parts as a mark, the designated serviced places serviced or not. Check the
parts must be used. insulation between the antenna terminal or
external metal and the AC cord plug blades.
And be sure the safety of that.
4. PUT PARTS AND WIRES IN THE
ORIGINAL POSITION AFTER (INSULATION CHECK PROCEDURE)
ASSEMBLING OR WIRING 1. Unplug the plug from the AC outlet.
There are parts which use the insulation 2. Remove the antenna terminal on TV and turn
material such as a tube or tape for safety, or on the TV.
which are assembled in the condition that 3. Insulation resistance between the cord plug
these do not contact with the printed board. terminals and the eternal exposure metal
The inside wiring is designed not to get closer [Note 2] should be more than 1M ohm by
to the pyrogenic parts and high voltage parts. using the 500V insulation resistance meter
Therefore, put these parts in the original [Note 1].
positions. 4. If the insulation resistance is less than 1M
ohm, the inspection repair should be
5. TAKE CARE TO DEAL WITH THE required.
CATHODE-RAY TUBE [Note 1]
In the condition that an explosion-proof cathode- If you have not the 500V insulation
ray tube is set in this equipment, safety is resistance meter, use a Tester.
secured against implosion. However, when
[Note 2]
removing it or serving from backward, it is
External exposure metal: Antenna terminal
dangerous to give a shock. Take enough care to
Earphone jack
deal with it.

HOW TO ORDER PARTS
Please include the following informations when you order parts. (Particularly the VERSION LETTER.)
1. MODEL NUMBER and VERSION LETTER
The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be
found at the end of the SERIAL NUMBER.
2. PART NO. and DESCRIPTION
You can find it in your SERVICE MANUAL.

IMPORTANT
Inferior silicon grease can damage IC's and transistors.
When replacing an IC's or transistors, use only specified silicon grease (YG6260M).
Remove all old silicon before applying new silicon.

A1-1
CONTENTS

SERVICING NOTICES ON CHECKING .......................................................................................................... A1-1
HOW TO ORDER PARTS ............................................................................................................................... A1-1
IMPORTANT .................................................................................................................................................... A1-1
CONTENTS ..................................................................................................................................................... A2-1
GENERAL SPECIFICATIONS ........................................................................................................................ A3-1~A3-4
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF ANODE CAP ................................................................................................................. B1-1
2. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ................................................................... B2-1, B2-2
SERVICE MODE LIST ..................................................................................................................................... C-1
CONFIRMATION OF HOURS USED .............................................................................................................. C-1
WHEN REPLACING EEPROM (MEMORY) IC ............................................................................................... C-1
ELECTRICAL ADJUSTMENTS ....................................................................................................................... D-1~D-5
BLOCK DIAGRAM ........................................................................................................................................... E-1, E-2
PRINTED CIRCUIT BOARDS
MAIN/CRT/OPERATION/FRONT JACK ...................................................................................................... F-1~F-4
SCHEMATIC DIAGRAMS
MICON/TUNER ............................................................................................................................................ G-1, G-2
CHROMA ..................................................................................................................................................... G-3, G-4
TV POWER .................................................................................................................................................. G-5, G-6
DEFLECTION/CRT ...................................................................................................................................... G-7, G-8
SOUND/AV .................................................................................................................................................. G-9, G-10
WAVEFORMS .................................................................................................................................................. H-1, H-2
MECHANICAL EXPLODED VIEW ................................................................................................................... I-1
MECHANICAL REPLACEMENT PARTS LIST ............................................................................................... J1-1
ELECTRICAL REPLACEMENT PARTS LIST ................................................................................................. J2-1, J2-2

A2-1
GENERAL SPECIFICATIONS
G-1 TV CRT CRT Size / Visual Size 19 inch / 480mmV
System CRT Type Normal
Deflection 90 degree
Magnetic Field BV/BH +0.45G/0.18G
Color System NTSC
Speaker 2Speaker
Position Ext
Size 3 Inch
Impedance 8 ohm
Sound Output MAX 0.5+0.5 W
10%(Typical) -- W
NTSC3.58+4.43 /PAL60Hz No
G-2 T u n in g Broadcasting System US System M
System Tuner and System 1Tuner
Receive CH Destination USA(W/ CATV)
Tuning System F-Synth
Input Impedance VHF/UHF 75 ohm
2 - 69, 4A, A-5 - A-1,
CH Coverage A - I, J - W, W+1 - W+84
Intermediate Picture(FP) 45.75MHz
Frequency Sound(FS) 41.25MHz
FP-FS 4.50MHz
Preset CH No
StereoTV Sound (Ext Audio Input Only) Yes
Tuner Sound Muting Yes
G-3 Power Power Source AC 120V AC 60Hz
DC
Power Consumption at AC
73 W at AC 120 V 60 Hz
Stand by (at AC) 5 W at AC 120 V 60 Hz
Per Year -- kWh/Year
Protector Power Fuse Yes
Safety Circuit Yes
IC Protector(Micro Fuse) No
G-4 Regulation Safety UL / CSA
Radiation FCC / IC
X-Radiation DHHS / HWC
G-5 Temperature Operation +5oC ~ +40oC
Storage -20oC ~ +60oC
G-6 Operating Humidity Less than 80% RH
G-7 On Screen Menu Yes
Display Menu Type Disney Charecter
Picture Yes
Contrast Yes
Brightness Yes
Color Yes
Tint Yes
Sharpness Yes
Reset Yes
Audio No
Bass No
Treble No
Balance No
BBE On/Off No
Stable Sound On/Off No
CH Set Up Yes
TV/CATV Yes
Auto CH Memory Yes
Add/ Delete Yes
Language Yes
V-chip Yes
CH Label No
Favorite CH No
Color Stream DVD/DTV No
CAPTION Yes
Control Level Yes
Sound Yes
Brightness Yes
Contrast Yes
- Color Yes
Tint Yes
Sharpness Yes
Tuning No
Bass No
Treble No
Balance No
Back Light No

A3-1
GENERAL SPECIFICATIONS
Stereo,Audio Output,SAP No
Video Yes
Color Stream No
Channel(TV/Cable) Yes
CH Label No
Sleep Timer Yes
Sound Mute Yes
V-chip Rating Yes
G-8 OSD Language English French Spanish

G-9 Clock and Sleep Timer Max Time 120 Min
Timer Step 10 Min
On/Off Timer Program(On Timer / Off Timer) No
Wake Up Timer No
Timer Back-up (at Power Off Mode) more than -- Min Sec
G-10 Remote Unit RC-JK
Control Glow in Dark Remocon No
Format NEC
Custom Code 86-05 h
Power Source Voltage(D.C) 3V
UM size x pcs UM-4 x 2 pcs
Total Keys 23 Keys
Keys Power Yes
1 Yes
2 Yes
3 Yes
4 Yes
5 Yes
6 Yes
7 Yes
8 Yes
9 Yes
0 Yes
100 No
CH Up Yes
CH Down Yes
Volume Up Yes
Volume Down Yes
TV/Caption/Text Yes
CH1/CH2 Yes
TV/Video(TV/AV) Yes
CH RTN/CH ENT(Quick View) Yes
Sleep Yes
RE Call(Call) Yes
Reset No
Menu Yes
Enter No
Mute Yes
Exit No
MTS(Audio Select) No
Set + No
Set - No
Multi Brand Keys CH Up(VCR) No
CH Down(VCR) No
Pause/Still No
TV/VCR(VCR) No
Code No
FF No
Rew No
Rec No
Play No
Stop No
TV No
VCR No
Cable No
G-11 Features Auto Degauss Yes
Auto Shut Off Yes
Canal+ No
CATV Yes
Anti-theft No
Rental No
Memory(Last CH) Yes
Memory(Last Volume) Yes
V-Chip Yes
Type USA,ORION Type
BBE No
Auto Search No

A3-2
GENERAL SPECIFICATIONS
CH Allocation No
StereoTV Sound (Ext Audio Input Only) Yes
Channel Lock No
Just Clock Function No
Game Position No
CH Label No
VM Circuit No
Full OSD No
Premiere No
Comb Filter No
Lines
Auto CH Memory Yes
Hotel Lock No
Closed Caption Yes
Stable Sound No
Energy Star No
Power On Memory Yes
Favorite CH No
G-12 Accessories Owner's Manual Language English Spanish French
w/Guarantee Card No
Remote Control Unit Yes
Rod Antenna No
Poles
Terminal
Loop Antenna No
Terminal -
U/V Mixer No
DC Car Cord (Center+) No
Guarantee Card Yes
Warning Sheet No
Circuit Diagram No
Antenna Change Plug No
Service Facility List No
Important Safeguard No
Dew/AHC Caution Sheet No
AC Plug Adapter No
Quick Set-up Sheet No
Battery No
UM size x pcs
OEM Brand No
AC Cord No
AV Cord (2Pin-1Pin) No
Registration Card No
PTB Sheet No
300 ohm to 75 ohm Antenna Adapter No
Safety Strap Yes
Disney Leaflet Yes
G-13 Interface Switch Front Power Yes
System Select No
Main Power SW No
Sub Power No
Channel Up Yes
Channel Down Yes
Volume Up Yes
Volume Down Yes
MENU Yes
TV/Video Yes
Rear AC/DC No
TV/CATV Selector No
Degauss No
Main Power SW No
Indicator Power No
Stand-by No
On Timer No
Terminals Front Video Input RCA x 1
Audio Input RCA x 2
Other Terminal Head Phone
Rear Video Input(Rear1) RCA x 1
Video Input(Rear2) No
Audio Input(Rear1) RCA x 2
Audio Input(Rear2) No
Video Output No
Audio Output No
Euro Scart No
Color Stream No
Diversity No
Ext Speaker Yes

A3-3
GENERAL SPECIFICATIONS
DC Jack 12V(Center +) No
VHF/UHF Antenna Input F Type
AC Outlet No
G-14 Set Size Approx. W x D x H (mm) 510.0 x 442.5 x 572
w/o Speaker,Legs Approx. W x D x H (mm) 510.0 x 442.5 x 488.5
G-15 Weight Net (Approx.) 17.4kg ( 38.3lbs)
Net w/o Speaker,Legs Approx. 17.0 kg ( 37.4lbs )
Gross (Approx.) 21.3kg ( 46.9lbs)
G-16 Carton Master Carton No
Content ---- Sets
Material -- /--
Dimensions W x D x H(mm) -- x -- x --
Description of Origin No
Gift Box Yes
Material Double / Full Color
Dimensions W x D x H(mm) 596 x 575 x 580
Design As per Buyer's
Description of Origin Yes
Drop Test Natural Dropping At 1 Corner / 3 Edges
/ 6 Surfaces
Height (cm) 46
Container Stuffing 316 Sets/40' container
G-17 Cabinet Material Cabinet Cabinet Front PS 94V0 DECABROM
Cabinet Rear PS 94V0 DECABROM
PCB Non-Halogen Demand No
Eyelet Demand No
G-18 Environment Pb Free Lead-free Solder No
Other No
Cd Free No

A3-4
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF ANODE CAP 3. After one side is removed, pull in the opposite direction to
remove the other.
Read the following NOTED items before starting work.
NOTE
After turning the power off there might still be a potential
* voltage that is very dangerous. When removing the Take care not to damage the Rubber Cap.
Anode Cap, make sure to discharge the Anode Cap's INSTALLATION
potential voltage.
1. Clean the spot where the cap was located with a small
Do not use pliers to loosen or tighten the Anode Cap
* terminal, this may cause the spring to be damaged.
amount of alcohol. (Refer to Fig. 1-3.)

REMOVAL
1. Follow the steps as follows to discharge the Anode Cap. Location of Anode Cap
(Refer to Fig. 1-1.)
Connect one end of an Alligator Clip to the metal part of
a flat-blade screwdriver and the other end to ground.
While holding the plastic part of the insulated screwdriver,
touch the support of the Anode with the tip of the
screwdriver.
A cracking noise will be heard as the voltage is discharged.

Fig. 1-3
GND on the CRT
NOTE
Confirm that there is no dirt, dust, etc. at the spot where
the cap was located.
2. Arrange the wire of the Anode Cap and make sure the
wire is not twisted.
3. Turn over the Rubber Cap. (Refer to Fig. 1-4.)

Screwdriver CRT
Support
Alligator Clip

GND on the CRT
Fig. 1-1 Fig. 1-4

2. Flip up the sides of the Rubber Cap in the direction of the 4. Insert one end of the Anode Support into the anode button,
arrow and remove one side of the support. then the other as shown in Fig. 1-5.
(Refer to Fig. 1-2.)

Rubber Cap

CRT
Support
CRT Support Fig. 1-5
Fig. 1-2
5. Confirm that the Support is securely connected.
6. Put on the Rubber Cap without moving any parts.

B1-1
DISASSEMBLY INSTRUCTIONS
2. REMOVAL AND INSTALLATION OF 3. When IC starts moving back and forth easily after
desoldering completely, pickup the corner of the IC using
FLAT PACKAGE IC a tweezers and remove the IC by moving with the IC
desoldering machine. (Refer to Fig. 2-3.)
REMOVAL
NOTE
1. Put the Masking Tape (cotton tape) around the Flat
Some ICs on the PCB are affixed with glue, so be
Package IC to protect other parts from any damage. careful not to break or damage the foil of each IC
(Refer to Fig. 2-1.) leads or solder lands under the IC when removing it.
NOTE
Masking is carried out on all the parts located within Blower type IC
10 mm distance from IC leads. desoldering
machine

Masking Tape IC
(Cotton Tape)

Tweezers

Fig. 2-1
IC
Fig. 2-3
2. Heat the IC leads using a blower type IC desoldering
machine. (Refer to Fig. 2-2.)
4. Peel off the Masking Tape.
NOTE
Do not add the rotating and the back and forth 5. Absorb the solder left on the pattern using the Braided
directions force on the IC, until IC can move back and Shield Wire. (Refer to Fig. 2-4.)
forth easily after desoldering the IC leads completely. NOTE
Do not move the Braided Shield Wire in the vertical
direction towards the IC pattern.
Blower type IC
desoldering machine

Braided Shield Wire

Soldering Iron

IC
IC pattern Fig. 2-4
Fig. 2-2

B2-1
DISASSEMBLY INSTRUCTIONS
INSTALLATION 4. When bridge-soldering between terminals and/or the
soldering amount are not enough, resolder using a Thin-
1. Take care of the polarity of new IC and then install the tip Soldering Iron. (Refer to Fig. 2-8.)
new IC fitting on the printed circuit pattern. Then solder
each lead on the diagonal positions of IC temporarily.
(Refer to Fig. 2-5.)
Thin-tip Soldering Iron IC

Soldering Iron

Fig. 2-8

5. Finally, confirm the soldering status on four sides of the
Solder temporarily Solder temporarily
IC using a magnifying glass.
Confirm that no abnormality is found on the soldering
Fig. 2-5 position and installation position of the parts around the
IC. If some abnormality is found, correct by resoldering.
2. Supply the solder from the upper position of IC leads NOTE
sliding to the lower position of the IC leads.
When the IC leads are bent during soldering and/or
(Refer to Fig. 2-6.)
repairing, do not repair the bending of leads. If the
bending of leads are repaired, the pattern may be
damaged. So, be always sure to replace the IC in this
case.

Solder Soldering Iron

IC Supply soldering
from upper position
to lower position

Fig. 2-6

3. Absorb the solder left on the lead using the Braided
Shield Wire. (Refer to Fig. 2-7.)
NOTE
Do not absorb the solder to excess.

Soldering Iron
IC

Braided Shield Wire

Fig. 2-7

B2-2
SERVICE MODE LIST
This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily.
To enter the Service Mode, press both set key and remote control key for more than 1 second.

Set Key Remocon Key Operations
VOL. (-) MIN 0 Releasing of V-CHIP PASSWORD and LOCK PASSWORD.
Initialization of the factory.
VOL. (-) MIN 1
NOTE: Do not use this for the normal servicing.
If you set a factory initialization, the memories are reset such as the clock
setting, the channel setting, the POWER ON total hours, and PLAY/REC
total hours.

POWER ON total hours is displayed on the screen.
Refer to the "CONFIRMATION OF HOURS USED".
VOL. (-) MIN 6
Can be checked of the INITIAL DATA of MEMORY IC.
Refer to the "WHEN REPLACING EEPROM (MEMORY) IC".

Display of the Adjustment MENU on the screen.
VOL. (-) MIN 9
Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).

CONFIRMATION OF HOURS USED
POWER ON total hours can be checked on the screen. Total hours are displayed in 16 system of notation.
NOTE: If you set a factory initialization, the total hours is reset to "0".
1. Set the VOLUME to minimum. ADDRESS DATA

2. Press both VOL. DOWN button on the set and Channel
button (6) on the remote control for more than 1 second.
INIT 00 00 Initial setting content of MEMORY IC.
3. After the confirmation of using hours, turn off the power.
CRT ON 0010 POWER ON total hours.
= (16 x 16 x 16 x thousands digit value)
+ (16 x 16 x hundreds digit value)
FIG. 1 + (16 x tens digit value)
+ (ones digit value)

WHEN REPLACING EEPROM (MEMORY) IC
If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to
ensure correct data settings while making reference to TABLE 1.

INI +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F
00 00 60 99 93 1B B3 24 3B 09 00 07 05 80 A8 00 08

10 02

Table 1
1. Enter DATA SET mode by setting VOLUME to minimum.
2. While holding down VOLUME button on front cabinet, press key 6 on remote control for more than 1 second.
ADDRESS and DATA should appear as FIG 1.
3. ADDRESS is now selected and should "blink". Using the VOL. +/- button on the remote, step through the ADDRESS until
required ADDRESS to be changed is reached.
4. Press ENTER to select DATA. When DATA is selected, it will "blink".
5. Again, step through the DATA using VOL. +/- button until required DATA value has been selected.
6. Pressing ENTER will take you back to ADDRESS for further selection if necessary.
7. Repeat steps 3 to 6 until all data has been checked.
8. When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.
After the data input, set to the initializing of shipping.
9. Turn POWER on.
10. While holding down VOLUME button on front cabinet, press key 1 on remote control for more than 1 second.
11. After the finishing of the initializing of shipping, the unit will turn off automatically.

C-1
ELECTRICAL ADJUSTMENTS
1. BEFORE MAKING ELECTRICAL 2. BASIC ADJUSTMENTS
ADJUSTMENTS
2-1: VIF VCO
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies. 1. Place the set with Aging Test for more than 10 minutes.
2. Receive an 80dB monoscope pattern.
CAUTION 3. Connect the digital voltmeter between the pin 5 of