Samsung CHT-420 Service Manual

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Summary of Contents:

[Page 1] Samsung CHT-420

DVD-VCR COMBINATION CHT-420 ◆ Main Unit ; DVD-CM420 ◆ Speakers ; SP-420 SERVICE 1. Precautions 2. Alignment and Adjustment 3. Exploded Views and Parts List 4. Electrical Parts List 5. Block Diagram 6. Schematic Diagrams Manual DVD-VCR COMBINATI...

[Page 2] Samsung CHT-420

IMPORTANT SERVICE GUIDE ◆ MODE SWITCH (PROGRAM SWITCH) ASSEMBLY POINT 1) When installing the ass’y deck on the Main PCB, be sure to align the assembly point of mode switch. ASSEMBLY POINT VCR MAIN PCB Fig. 1 ◆ HOW TO EJECT THE CASSETTE TAPE ...

[Page 3] Samsung CHT-420

Samsung Electronics 1-1 1. Precautions 1-1 Safety Precautions 1) Before returning an instrument to the customer, always make a safety check of the entire instrument, including, but not limited to, the following items: (1) Be sure that no built-in pro...

[Page 4] Samsung CHT-420

Precautions 1-2 Samsung Electronics 2) Read and comply with all caution and safety re- lated notes on or inside the cabinet, or on the chas- sis. 3) Design Alteration Warning-Do not alter or add to the mechanical or electrical design of this instru- ...

[Page 5] Samsung CHT-420

Precautions Samsung Electronics 1-3 1-2 Servicing Precautions CAUTION : Before servicing units covered by this service manual and its supplements, read and follow the Safety Precautions section of this manual. Note : If unforseen circument create con...

[Page 6] Samsung CHT-420

Precautions 1-4 Samsung Electronics 1-3 ESD Precautions Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be dam- aged easily by static electricity. Such components commonly are called Electrostati- cally Sensitiv...

[Page 7] Samsung CHT-420

Precautions Samsung Electronics 1-5 1-4 Handling the optical pick-up The laser diode in the optical pick up may suffer elec- trostatic breakdown because of potential static elec- tricity from clothing and your body. The following method is recommende...

[Page 8] Samsung CHT-420

Precautions 1-6 Samsung Electronics 1-5 Pick-up disassembly and reassembly 1-5-1 Disassembly 1) Remove the power cord. 2) Disassemble the Deck-Assy. 3) Make solder land 2 points short on Pick-up. (See Fig. 1-4) 4) Disassembly the Pick-up. 1-5-2 Asse...

[Page 9] Samsung CHT-420

Samsung Electronics 2-1 2. Alignment and Adjustments 2-1 VCR Adjustment 1) X-Point (Tracking center) adjustment, “Head switching adjustment” and “NVRAM option setting” can be adjusted with remote control. 2) When replacing the VCR Main PCB Mi...

[Page 10] Samsung CHT-420

2-2 Alignment and Adjustments Samsung Electronics 2-1-1(b) TEST location for adjustment mode setting Fig. 2-2 Function-Timer PCB (Top View) TEST (SW718) BUTTON ...

[Page 11] Samsung CHT-420

Alignment and Adjustments 2-3 Samsung Electronics 2-1-2 Head Switching Point Adjustment 1) Playback the alignment tape. 2) Press the “SW718(TEST)” button on Function-Timer PCB to set the adjustment mode. (See Fig. 2-2) 3) Press the “1, 0” but...

[Page 12] Samsung CHT-420

2-4 Alignment and Adjustments Samsung Electronics 2-2 DVD Adjustment 2-2-1 Location of Test Point Fig. 2-5 Location of test Point (DVD Main PCB - Top Side) ...

[Page 13] Samsung CHT-420

Alignment and Adjustments 2-5 Samsung Electronics 2-2-2(a) Adjustment Spec. and Test Point 2-2-2 Skew Adjustment Test Disc Adjustment Spec. Test Point Adjustment Location TDV-533 “ENV” Ass’y Deck - Bottom Side Chapter 14 Flat Waveform (DVD Main...

[Page 14] Samsung CHT-420

2-6 Alignment and Adjustments Samsung Electronics 2-2-2(b) SKEW Adjustment Method Needed to minimize the variations in Skew of the Pick-up unit and to provide optimum match with the recorded signal on the Disc. 1) Remove the Ass’y Deck. Place the A...

[Page 15] Samsung CHT-420

Alignment and Adjustments 2-7 Samsung Electronics 2-2-3(a) Adjustment Spec. and Test Point 2-2-3 RF SUM Level Adjustment Test Disc Adjustment Spec. Test Point Adjustment Location “RF EQC” VR1 TDV-525 1.7 ± 0.2V (DVD Main PCB - Top Side) (DVD Mai...

[Page 16] Samsung CHT-420

2-8 Alignment and Adjustments Samsung Electronics 2-2-3(b) RF SUM Level Adjustment Method 1) Connect an Oscilloscope to the “RF EQC ” Test Point. (See Fig. 2-5) 2) Play a Normal DVD disc and set the Oscilloscope Range as follows : (Voltage ; 50mV...

[Page 17] Samsung CHT-420

2-3 VCR Mechanical Adjustment 2-3-1 Tape Transport System and Adjustment Locations The tape transport system has been adjusted precisely in the factory. Alignment is not necessary except for the following : 1) Noise observed on the screen. 2) Tape ...

[Page 18] Samsung CHT-420

2-10 Alignment and Adjustments Samsung Electronics 2-3-2 Tape Transport System Adjustment When parts are replaced, perform the required adjustments by referring to procedures for the tape transport system. If there are any changes to the tape path, f...

[Page 19] Samsung CHT-420

Alignment and Adjustments 2-11 Samsung Electronics b. ACE HEAD TILT ADJUSTMENT 1) Playback a blank tape and observe the position of the tape at the lower flange of tape guide. 2) Confirm that there is no curl or wrinkle at the lower flange of tape gu...

[Page 20] Samsung CHT-420

2-12 Alignment and Adjustments Samsung Electronics d. ACE HEAD POSITION (X-POINT) ADJUSTMENT 1) Playback the alignment tape (Color bar). 2) Press the “SW718(TEST)” button on Function-Timer PCB to set the adjustment mode. (See Fig. 2-2) 3) Press t...

[Page 21] Samsung CHT-420

(2) Linearity adjustment (Guide roller S, T adjustment) 1) Playback the Mono Scope alignment tape (SP mode). 2) Observe the video envelope signal on an oscilloscope (triggered by the video switching pulse). 3) Make sure the video envelope waveform (...

[Page 22] Samsung CHT-420

2-14 Alignment and Adjustments Samsung Electronics 6) Play back the Mono Scope alignment tape (SP mode). 7) Connect an oscilloscope CH-1 to the “Envelope” and CH-2 to the “H’D SW Pulse” for triggering. 8) Turn the guide roller heads with a...

[Page 23] Samsung CHT-420

(3) Check Transitional Operation from RPS to Play Check transition from RPS mode to play mode : Using a pre-recorded SP tape, make sure the entry side of enve- lope comes to an appropriate steady state within 3 seconds (as shown in Fig. 2-19). If th...

[Page 24] Samsung CHT-420

2-16 Alignment and Adjustments Samsung Electronics 2-3-3 Reel Torque 1) The rotation of the capstan motor causes the holder clutch ass’y to rotate through the belt pulley. 2) The spring wrap PLAY/REV of holder clutch ass’y drives the disk reel S...

[Page 25] Samsung CHT-420

Samsung Electronics 3-1 3. Exploded View and Parts List 3-1 Cabinet Assembly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-2 3-2 VCR Mechanical Parts (Top Side) - - - - - - - - - - - - - - - - - - - - - - - - ...

[Page 26] Samsung CHT-420

Exploded View and Parts List 3-2 Samsung Electronics 3-1 Cabinet Assembly VCR DECK (S.N.A.) DVD DECK (S.N.A.) 157 BRACKET-FRAME (S.N.A.) 153 157 UT01 101 10 156 155 701A 701 (FUNCTION-TIMER PCB) 601 (VCR MAIN PCB) 602 (DVD MAIN PCB) 603 (S.M.P.S. P...

[Page 27] Samsung CHT-420

Exploded View and Parts List 3-3Samsung Electronics Loc. No Parts No. Description ; Specification Remark 1 AK97-00257K ASSY-PANEL FRONT;HIPS V2,DVD-CM420/XAA,- 2 AK64-00139B DOOR-TRAY;DVD-CM350,ABS 94HB,-,-,-,-,-,- 3 AC61-00267A SPRING ETC-DOOR TRAY;...

[Page 28] Samsung CHT-420

Exploded View and Parts List 3-4 Samsung Electronics 3-2 VCR Mechanical Parts (Top Side) G001 G555 G510 G480 K546 G680 G681 B410 B475 B440 B448 B452 G546 G060 G520 G527 K188 K182 K110 K240 K248 K350 K330 K140 K340 G070 K470 B474 ...

[Page 29] Samsung CHT-420

Exploded View and Parts List 3-5Samsung Electronics Loc. No Parts No. Description ; Specification Remark B410 AC31-00018A MOTOR-LOADING ASSY;-,SCORPIO2(TS-10A),-, B440 AC60-10515A SCREW-MACHINE;-,-,M3,L3,PH,+,-,-,ZPC,- B448 AC66-00008A GEAR-WORM WHEE...

[Page 30] Samsung CHT-420

Exploded View and Parts List 3-6 Samsung Electronics 3-3 VCR Mechanical Parts (Bottom Side) G542 B462 B560 B501 B484 B561 B488 B500 B456 B458 B464 B468 K222 K200 K225 K221 B478 B570 B460 B489 ...

[Page 31] Samsung CHT-420

Exploded View and Parts List 3-7Samsung Electronics Loc. No Parts No. Description ; Specification Remark B456 AC66-00009A GEAR-JOINT 1;TS-10,POM,1.5,17.5(22),-,NA B458 AC66-00012A GEAR-JOINT 2;TS-10,POM,1.0,23,-,BLK,24.6 B460 AC61-00090A BRACKET-GEAR...

[Page 32] Samsung CHT-420

Exploded View and Parts List 3-8 Samsung Electronics 3-4 DVD Mechanical Parts H108 H106 S.N.A. H105 H107 H102 H211 H203 H241 H212 905 H104 H250 H103 H207 H208 S.N.A. H202 H210 H204 H205 H209 H206 901 900 904 906 903 ...

[Page 33] Samsung CHT-420

Exploded View and Parts List 3-9Samsung Electronics Loc. No Parts No. Description ; Specification Remark 900 6003-001157 SCREW-TAPTITE;PWH,+,B,M2,L6,ZPC(YEL),SWR 901 6001-001522 SCREW-MACHINE;FH,+,M2.6,L7,ZPC(YEL),SWRC 903 6009-001245 SCREW-SPECIAL;S...

[Page 34] Samsung CHT-420

Exploded View and Parts List 3-10 Samsung Electronics 3-5 Speakers System RIDIO ANT. DVD & VCR LINE IN 1 LINE IN 2 LINE IN 3 LINE OUT VIDEO L - AUDIO - R VIDEO L - AUDIO - R POWER ON OFF DVD Olny COMPONENT VIDEO OUT SPEAKERS IN ...

[Page 35] Samsung CHT-420

Loc.No Part No Description ; Specification Remark Loc.No Part No Description ; Specification Remark Samsung Electronics 4-1 601 AC92-01413A ASSY PCB-MAIN;THEATER2,COMBO POWER DRIVE PARTS C1P101 2401-001730 C-AL;10uF,20%,50V,GP,TP,5x11,2.5 C1P102 ...

[Page 36] Samsung CHT-420

Loc.No Part No Description ; Specification RemarkLoc.No Part No Description ; Specification Remark 4-2 Samsung Electronics Electrical Parts List L601 3301-000297 CORE-FERRITE BEAD;AA,3.6x1.2x5.7mm,1400, L602 2701-000002 INDUCTOR-AXIAL;100uH,10%,4...

[Page 37] Samsung CHT-420

Loc.No Part No Description ; Specification Remark Loc.No Part No Description ; Specification Remark Electrical Parts List Samsung Electronics 4-3 CN3A1B 3809-001206 CABLE-FLAT;30V,-20to+80C,140mm,6P,1.25mm IC301 1204-001952 IC-VIDEO PROCESS;LA712...

[Page 38] Samsung CHT-420

R510 2001-000005 R-CARBON;390ohm,5%,1/8W,AA,TP,1.8x3.2mm R512 2001-000005 R-CARBON;390ohm,5%,1/8W,AA,TP,1.8x3.2mm R514 2001-000780 R-CARBON;470OHM,5%,1/8W,AA,TP,1.8X3.2MM R515 2001-000878 R-CARBON;6.2KOHM,5%,1/8W,AA,TP,1.8X3.2M R516 2001-000780 R-CAR...

[Page 39] Samsung CHT-420

602 AK92-00172A ASSY PCB-DVD AMP;CHT-420/XAA,DVD,MAIN AC14 2203-001607 C-CERAMIC,CHIP;0.22nF,5%,50V,NP0,TP,1608 AC21 2203-000315 C-CERAMIC,CHIP;0.12NF,5%,50V,C0G,TP,1608 AC22 2203-005148 C-CERAMIC,CHIP;100nF,10%,16V,X7R,TP,1608 AC23 2203-000125 C-CER...

[Page 40] Samsung CHT-420

DAR26 2007-000090 R-CHIP;10KOHM,5%,1/16W,DA,TP,1608 DAR27 2007-000090 R-CHIP;10KOHM,5%,1/16W,DA,TP,1608 DAR28 2007-000090 R-CHIP;10KOHM,5%,1/16W,DA,TP,1608 DAR3 2007-000074 R-CHIP;100ohm,5%,1/16W,DA,TP,1608 DAR4 2007-000074 R-CHIP;100ohm,5%,1/16W,DA,...

[Page 41] Samsung CHT-420

PACC16 2203-000440 C-CERAMIC,CHIP;1nF,10%,50V,X7R,TP,1608,- PACC17 2203-000257 C-CERAMIC,CHIP;10nF,10%,50V,X7R,TP,1608 PACC2 2203-005148 C-CERAMIC,CHIP;100nF,10%,16V,X7R,TP,1608 PACC3 2203-000206 C-CERAMIC,CHIP;100nF,10%,50V,X7R,TP,2012 PACC4 2203-00...

[Page 42] Samsung CHT-420

PARF11 2007-008541 R-CHIP,MELF;1.5OHM,1%,1/4W,-,TP,1.4X3.6M PARF12 2007-008541 R-CHIP,MELF;1.5OHM,1%,1/4W,-,TP,1.4X3.6M PARF13 2007-002425 R-CHIP;1OHM,5%,1/16W,DA,TP,1608 PARF14 2007-002425 R-CHIP;1OHM,5%,1/16W,DA,TP,1608 PARF15 2007-002425 R-CHIP;1O...

[Page 43] Samsung CHT-420

RQ2 0501-000279 TR-SMALL SIGNAL;KSA1182-Y,PNP,150mW,SOT- RR1 2007-000091 R-CHIP;12Kohm,5%,1/16W,DA,TP,1608 RR10 2007-000312 R-CHIP;10OHM,5%,1/8W,DA,TP,3216 RR12 2007-000102 R-CHIP;100Kohm,5%,1/16W,DA,TP,1608 RR13 2007-000102 R-CHIP;100Kohm,5%,1/16W,D...

[Page 44] Samsung CHT-420

SR71 2007-000090 R-CHIP;10KOHM,5%,1/16W,DA,TP,1608 SR72 2007-000090 R-CHIP;10KOHM,5%,1/16W,DA,TP,1608 SR73 2007-000090 R-CHIP;10KOHM,5%,1/16W,DA,TP,1608 SR74 2007-000084 R-CHIP;4.7Kohm,5%,1/16W,DA,TP,1608 SR75 2007-000093 R-CHIP;20Kohm,5%,1/16W,DA,TP...

[Page 45] Samsung CHT-420

ZR36 2007-000090 R-CHIP;10KOHM,5%,1/16W,DA,TP,1608 ZR37 2007-000113 R-CHIP;33ohm,5%,1/16W,DA,TP,1608 ZR38 2007-000113 R-CHIP;33ohm,5%,1/16W,DA,TP,1608 ZR39 2007-000113 R-CHIP;33ohm,5%,1/16W,DA,TP,1608 ZR4 2007-001164 R-CHIP;75ohm,1%,1/16W,DA,TP,1608 ...

[Page 46] Samsung CHT-420

PR24 2003-002290 R-METAL OXIDE;180KOHM,5%,1W,AD,TP,3.3X9M PR3 2004-005063 R-METAL;708ohm,1%,1/4W,AA,TP,2.4X6.4mm PR31 2001-001153 R-CARBON(S);47OHM,5%,1/2W,AA,TP,2.4X6.4M PR40 2002-001090 R-COMPOSITION;2.7MOHM,5%,1/2W,AA,TP,4.0X PR41 2001-000588 R-CA...

[Page 47] Samsung CHT-420

Samsung Electronics 5-1 5. Block Diagram LINE IN 3 LINE IN 2 LINE IN 1 LINE OUT OPT IN (LINE3) Y/Cb/Cr Y/C Headphones 6Speakers AIC101/151/201 AIC251/300/401/402 (TAS5110) PWM Power Amp DAIC11 (TAS5026) DAP & PWM Motors/pick up ass 'y SIC3 ...

[Page 48] Samsung CHT-420

Block Diagram 5-2 Samsung Electronics MEMO ...

[Page 49] Samsung CHT-420

Samsung Electronics 6-1 6. Schematic Diagrams ◆ Block Identification of Main PCB- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6-1 S.M.P.S.-1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ...

[Page 50] Samsung CHT-420

Schematic Diagrams 6-2 Samsung Electronics ◆ Block Identification of Main PCB VCR MAIN PCB <Component Side> <Conductor Side> LA3663FBP LA3663FBP IC801 LA73024V IC801 LA73024V <Component Side> DVD MAIN PCB ...