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DBTV2500
SERVICE MANUAL
COLOR TELEVISION RECEIVER
ORIGINAL
MFR’S VERSION B
Design and specifications are subject to change without notice.
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DBTV2500 SERVICE MANUAL COLOR TELEVISION RECEIVER REVISION 1 MFR’S VERSION D MFR’S VERSION IC101 B OEC7044A D OEC7045A Please file this revision with the original version.
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Change of IC101 DIFFERENCES MFR'S VERSION B MFR'S VERSION D PART NO. DESCRIPTION PART NO. DESCRIPTION REF. NO. IC101 I56F07044A IC OEC7044A I56F07045A IC OEC7045A PCB010 A3I058G01A MAIN PCB ASS'Y TMX456A A3I058G01B MAIN PCB ASS'Y TMX456A SPEC.NO. M3I0-62G O/R NO. A073521
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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- ripheral circuit, use the designated parts and 2. AVOID AN EL
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CONTENTS A1-1 SERVICING NOTICES ON CHECKING ...................................................................................................... HOW TO ORDER PARTS ........................................................................................................................... A1-1 A1-1 IMPORTANT ................................................................................................................................................ CONTENTS ....................................
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GENERAL SPECIFICATIONS G-1.Outline of the Product 25 inch( 626 mmV):Measured diagonally Color CRT 100 degree deflection G-2.Broadcasting System US System M G-3.Color System NTSC PAL SECAM or Monochrome signal G-4.NTSC Playback(PAL 60Hz) Yes No G-5.NTSC 3.58+4.43/PAL60Hz Yes No G-6.Antenna Input Impedance VHF/UHF 75 ohm unbalanced G-7.Tuner and Receiving Contactless Electric tuner 1Tuner System 2Tuner System channel Tuner Oscar(W/O HYPER) Oscar(W/ HYPER) France C
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GENERAL SPECIFICATIONS G-17.Protector: Power Fuse G-18.Regulation Safety UL CSA SAA SI CE SEV BS NF NEMKO FEMKO DEMKO IEC65 SEMKO NZ HOMOLO SABS CNS SISIR NOM AS3159 DENTORI UNE GOST NONE Radiation FCC DOC FTZ PTT CE SEV SABA SI NF NZ HOMOLO UNE CNS CISPR13 DENTORI AS/NZS NONE X-Radiation PTB DHHS HWC DENTORI NONE G-19.Temperature Operation 5 ˚C~ 40 ˚C Storage -20 ˚C~ 60 ˚C G-20.Operating Humidity Less than 80 %RH G-21.Clock and Timer Sleep Timer Yes Max 120 Min.( 10 Min. Step)
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GENERAL SPECIFICATIONS G-26.OSD Language Eng Ger Fre Spa Ita Por Jpn OSD Language Setting Eng Ger Fre Spa Ita Por Jpn Not Applicable G-27.Speaker Position Front Side Bottom Size 1.5 x 2.7 inches Imp. 4 ohm x 2 pcs Power Max 075 + 0.75 W 10% 0.5 + 0.5 W (Typical) G-28.EXT Speaker Yes -- W Imp -- ohm G-29.Carton Master Carton: Need No Need Content: ---- Set Material: ---- / ---- Corrugated Carton Dimensions: ---- mm(W) ---- mm(D) ---- mm(H) Description o
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GENERAL SPECIFICATIONS G-32.Switch Front Power(Tact) Channel Up/Reset Volume Up/Set Up System Select Channel Down/Enter Volume Down/Set Down Main Power SW Sub Power Menu:Vol UP + Vol Down Rear AC/DC TV/CATV Selector Degauss Main Power SW G-33.Magnetic Field BV : +0.45G BV : +0.35G BV : +0.25G BH : 0.18G BH : 0.30G BH : 0.30G BV : -0.15G BV : -0.25G BV : -0.50G BH : 0.15G BH : 0.15G BH : 0.30G G-34.Remote Control Unit: RC- 74 Glow in Dark Remocon Yes No Power Source: D.C 3 V Battery UM -
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DISASSEMBLY INSTRUCTIONS 3. After one side is removed, pull in the opposite direction to 1. REMOVAL OF ANODE CAP remove the other. Read the following NOTED items before starting work. NOTE * After turning the power off there might still be a potential Take care not to damage the Rubber Cap. voltage that is very dangerous. When removing the 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
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DISASSEMBLY INSTRUCTIONS 4. Insert one end of the Anode Support into the anode button, then the other as shown in Fig. 1-5. Support CRT Fig. 1-5 5. Confirm that the Support is securely connected. 6. Put on the Rubber Cap without moving any parts. 2. REMOVAL OF DEFLECTION YOKE (Refer to Fig. 2-1) 1. Loosen the screw 1. 2. Remove the Convergence • Purity Magnet in the direction of arrow (A). 3. Loosen the screw 2. 4. Remove the 3 Wedges. 5. Remove the Deflection Yoke in the direction of arrow (B).
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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 0 Releasing of V-CHIP PASSWORD. VOL. (-) MIN Initialization of the factory. VOL. (-) MIN 1 NOTE: Do not use this for the normal servicing. POWER ON total hours is displayed on the screen. Refer to the "CONFIRMATION OF USING HOURS". VOL. (-) MIN 6 Can be checke
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ELECTRICAL ADJUSTMENTS 1. BEFORE MAKING ELECTRICAL 2. BASIC ADJUSTMENTS ADJUSTMENTS 2-1: RF AGC DELAY Read and perform these adjustments when repairing the 1. Receive an 80dB monoscope pattern. circuits or replacing electrical parts or PCB assemblies. 2. Connect the digital voltmeter to TP001. 3. Activate the adjustment mode display of Fig. 1-1 and CAUTION press the channel button (02) on the remote control to • Use an isolation transformer when performing any select "RF DELAY". service on this
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ELECTRICAL ADJUSTMENTS TV Fig. 2-1 00 OSD 15 A B Fig. 2-3 0% 2-9: OSD HORIZONTAL 1. Activate the adjustment mode display of Fig. 1-1. 110% 2. Press the VOL. UP/DOWN button on the remote control until the difference of A and B becomes minimum. (Refer to Fig. 2-3) 100% Fig. 2-2 2-10: VERTICAL VCO 1. Place the set with Aging Test for more than 15 minutes. 2. Receive an 80dB monoscope pattern. 3. Connect the digital voltmeter between the pin 5 of CP601. 4. Activate the adjustment mode display
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ELECTRICAL ADJUSTMENTS 3-3: STATIC CONVERGENCE 3. PURITY AND CONVERGENCE ADJUSTMENTS NOTE NOTE Adjust after performing adjustments in section 3-2. 1. Receive the crosshatch pattern from the color bar 1. Turn the unit on and let it warm up for at least 30 minutes before performing the following adjustments. generator. 2. Combine red and blue of the 3 color crosshatch pattern 2. Place the CRT surface facing east or west to reduce the on the center of the screen by adjusting the pair of terrestr
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MAJOR COMPONENTS LOCATION GUIDE TU001 FB401 TP001 CP601 FOCUS VOLUME SCREEN VOLUME MAIN PCB TP023 TP024 J801 TP022 CRT PCB D3-1
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BLOCK DIAGRAM Q351 MUTE SW. TU001 CHROMA IC CH UP IC601 M61203BFP X602 3.579545MHz IC351 AN7523 11 4 VOL UP 5 1 32 X' TAL AUDIO OUT 50 6 2 MICON IC SOUND IC SP351 62 CH DOWN RF AGC OUT IC101 OEC7044A CF601 9 4 SAW FILTER 64 VIF IN (1) VOL DOWN Q606 5 AUDIO MUTE 1 VIF IN (2) REG. KEY2 P. CON+15V 26 REG OUT 33 POWER CVIN 40 Q801 17 Y SW OUT R OUT RED R 42 14 RED OUT KEY1 30 R IN 27 GREEN G 41 28 G IN G OUT 15 Q803 GREEN OUT BLUE B 40 20 B IN B OUT 16 Q603 OS101 BLANK BL 39 27 FAST BLK Q802 R
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R501_1 W006 D501 D504 Q401 C503 C501 C443 TH501 CP501 R802 C504 W003 D502 R803 C444 D101 R804 W891 D503 R805 L801 W079 R807 C437 W838 C416 D125 W802 C507 C132_1 C446 W018 Q402 C435 C439 W061 W103 W021 C440 R446 C433 W020 W085 C427 W104 W815 D411 R404 W801 R405 W070 C405 C418 R408 C115 R401 W078 R418 W022 C119 C646 W820 R424 C430 L101 R135 W028 R409 R643 C122 W027 W005 W060 W026 W017 C130 C417_1 C422 C121 D403 R416 C124 W095 C448 W097 W030 W069 C128 W090 W098 W031 W032 R434_1 R445_1 D602 W025 C41
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PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE R638 C113 R642 C699 17 IC101 C634_1 IC601 1 33 R603 49 R111 C642 R611 F-4 F-3 R813 R809 C804 R811 C805 R814 C806 R101 R816 C801 R406 R113 R126 R420 R419 R112 R131 R117 C114 C411 R505 C120 R107 R130 R504 R129 R106 R115 R105 R114 R119 R116 C116 R123 R128 C117 R110 R120 R121 R102 R636 R103 R122 R124 R104 R356 R646 R639 R354 C616 R635 R633 C643 R620 R627 R641 R608 R616 R617 R634 R631 R609 R355 R358 R625 R606 C618_1 C626 R619 R630 R612
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ABC D E F G H MICON/TUNER SCHEMATIC DIAGRAM (MAIN PCB) 8 8 TU001 NJH3021U268 ACCESORY ATC001 NXC0032-010010 TP001 TM101 R25-1127 C003 FROM DEFLECTION/CRT 50V4.7 KA 7 7 P_CON+5V OS101 FROM POWER PIC-28143SY-2 GND R001 S809X +B 68K1/2W R002 FROM/TO CHROMA 68K 1/2W AGC IF 6 6 I2C_OFF VD HD MICON IC 3 IC101 OEC7044A R123 0 4.9 OSD_R P50/H.SYNC RED R 4.7K R122 4.9 0 P51/V.SYNC GREEN G OSD_G 4.7K 4 R121 0 0 P00/EXT MUTE BLUE B OSD_B 4.7K R116 R120 0 4.9 P01/I2C_OFF OSD_BLK OUT1/BLANK BL R117 47K 4.7K
