Magnavox MWC24T5 Service Manual

24″ color tv/dvd/vcr

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Owner's manual (56 pages)

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Page 1 I Schematic Diagrams I CBA’s I Exploded Views I Parts List This service manual is for the MWC24T5 version B model, which is different from the previous model. For MWC24T5 version B model, a suffix “B” is printed on the rating label on the back of the unit.
Page 2 IMPORTANT SAFETY NOTICE Proper service and repair is important to the safe, reliable operation of all Funai Equipment. The service procedures recommended by Funai and described in this service manual are effective methods of performing service operations. Some of these service special tools should be used when and as recommended.
Page 3: Table Of Contents
Electrical Parts List ..............1-19-1 MWC24T5...
Page 4: Specifications
*ˆ Mode---------SP mode unless otherwise specified * Test input terminal <Except Tuner>--------Video input (1 Vp-p) Audio input (-10 dB) <Tuner>------------------Ant. input (80 dBµV) Video: 87.5% < DEFLECTION > Description 1. Over Scan 2. Linearity 3. High Voltage < VIDEO & CHROMA > Description 1.
Page 5 < VCR > Description 1. Horizontal Resolution 2. Jitter (Low) AM(SP) 3. S/N Chroma PM(SP) 4. Wow & Flutter (JIS, UNWTD) < TUNER > Description 1. Video S/N (80 dBµV, TV4ch) 2. Audio S/N (W/LPF) < NORMAL AUDIO> All items are measured across 8 Ω resistor at speaker output terminal. Description 1.
Page 6: Laser Beam Safety Precautions
LASER BEAM SAFETY PRECAUTIONS This DVD player uses a pickup that emits a laser beam. The laser beam is emitted from the location shown in the figure. When checking the laser diode, be sure to keep your eyes at least 30 cm away from the pickup lens when the diode is turned on. Do not look directly at the laser beam.
Page 7: Important Safety Precautions
IMPORTANT SAFETY PRECAUTIONS Prior to shipment from the factory, our products are strictly inspected for recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.
Page 8 Also, because the picture tube shields and mounting hardware perform an X-radiation protection function, they must be correctly in place. High voltage must be measured each time servicing is performed that involves B+, horizontal deflection or high voltage. Correct operation of the X-radiation protection circuits also must be reconfirmed each time they are serviced.
Page 9 of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced. Precautions during Servicing A. Parts identified by the # symbol are critical for safety.
Page 10 Safety Check after Servicing Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned to original positions. Afterwards, perform the following tests and confirm the specified values in order to verify compliance with safety standards. 1.
Page 11: Standard Notes For Servicing
STANDARD NOTES FOR SERVICING Circuit Board Indications 1. The output pin of the 3 pin Regulator ICs is indicated as shown. Top View Input 2. For other ICs, pin 1 and every fifth pin are indicated as shown. Pin 1 3.
Page 12 around the flat pack-IC to protect other parts from damage. (Fig. S-1-2) 3. The flat pack-IC on the CBA is affixed with glue, so be careful not to break or damage the foil of each pin or the solder lands under the IC when removing it.
Page 13 With Iron Wire: 1. Using desoldering braid, remove the solder from all pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-IC, you can remove it easily. (Fig. S-1-3) 2. Affix the wire to a workbench or solid mounting point, as shown in Fig.
Page 14 Instructions for Handling Semi- conductors Electrostatic breakdown of the semi-conductors may occur due to a potential difference caused by electrostatic charge during unpacking or repair work. 1. Ground for Human Body Be sure to wear a grounding band (1 MΩ) that is properly grounded to remove any static electricity that may be charged on the body.
Page 15: Preparation For Servicing
PREPARATION FOR SERVICING How to Enter the Service Mode Caution 1: 1. Optical sensors system are used for Tape Start and End Sensor on this equipment. Read this page carefully and prepare as described on this page before starting to service; otherwise, the unit may operate unexpectedly.
Page 16: Cabinet Disassembly Instructions
CABINET DISASSEMBLY INSTRUCTIONS 1. Disassembly Flowchart This flowchart indicates the disassembly steps for the cabinet parts, and the CBA in order to gain access to item(s) to be serviced. When reassembling, follow the steps in reverse order. Bend, route and dress the cables as they were.
Page 17 Reference Notes in the Table CAUTION! When removing the CRT, be sure to discharge the Anode Lead of the CRT with the CRT Ground Wire before removing the Anode Cap. 1. CAUTION 1: Discharge the Anode Lead of the CRT with the CRT Ground Wire before removing the Anode Cap.
Page 18 (S-5) (S-5) [4] DVD Mechanism (S-6) (S-6) (S-6) [6] Sub CBA [7] Function CBA [2] Tray Chassis Unit Top Shield (S-7) (S-8) (S-8) (S-8) [8] Deck Assembly [5] DVD Main CBA Unit (S-11) (S-11) (S-11) (S-9) (S-10) 1-6-3 (S-7) [9] Main CBA Fig.
Page 19 (S-4) (S-4) [3] CRT DVD Mechanism Short the three short lands by soldering. (Either of two places.) View for A FPC Cable 1-6-4 Anode Cap CRT CBA (S-4) (S-4) Fig. D3 Fig. D4 T2202DC...
Page 20 JUNCTION-B TO SPEAKER CL3801 ANODE CN3801 FOCUS CL2504A SCREEN CN2501 CL2501B CRT CBA TO SPEAKER JUNCTION-A CBA DVD MAIN CBA UNIT CN301 CN201 CN2A CN2801 CN2571 SUB CBA CN2503 CN2401 MAIN CBA CL1403 CN1301 CN1803 CL1401 CL1402 CN1601 CL1201 CN1802 CN3802 CL3802 FE HEAD...
Page 21: Electrical Adjustment Instructions
ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: “CBA” is abbreviation for “Circuit Board Assembly.” Note: Electrical adjustments are required after replacing circuit components and certain mechanical parts. It is important to perform these adjustments only after all repairs and replacements have been completed. Also, do not attempt these adjustments unless the proper equipment is available.
Page 22 2. Setting for CONTRAST, COLOR, TINT, V-TINT and SHARP Data Values General 1. Enter the Service mode. (See page 1-7-1.) 2. Press [PICTURE] button on the service remote control unit. Display changes “BRT,” “CNT,” “COL,” “TNT,” “V-T,” and “SHP” cyclically when [PICTURE] button is pressed.
Page 23 4. Cut-off Adjustment Purpose: To adjust the beam current of R, G, B, and screen voltage. Symptom of Misadjustment: White color may be reddish, greenish or bluish. Test Point Adj. Point Mode Screen-Control [CH. o / p] buttons Tape M. EQ. Pattern Generator Figure...
Page 24 7. White Balance Adjustment Purpose: To mix red, green and blue beams correctly for pure white. Symptom of Misadjustment: White becomes bluish or reddish. Test Point Adj. Point Mode [CH. o / p] Screen buttons Tape M. EQ. Pattern Generator, Color analyzer Figure Color Analyzer...
Page 25 9. Focus Adjustment Purpose: Set the optimum Focus. Symptom of Misadjustment: If Focus Adjustment is incorrect, blurred images are shown on the display. Test Point Adj. Point Mode Focus Control Tape M. EQ. Pattern Generator Note: Focus VR --- FBT (Sub CBA), FBT = Fly Back Transformer 1.
Page 26 13. Head Switching Position Adjustment Purpose: Determine the Head Switching Position during Playback. Symptom of Misadjustment: May cause Head Switching Noise or Vertical Jitter in the picture. Note: Unit reads Head Switching Position automatically and displays it on the screen (Upper Left Corner).
Page 27 15. Convergence Adjustment Purpose: To obtain proper convergence of red, green and blue beams. Symptom of Misadjustment: If Convergence Adjustment is incorrect, the edge of white letters may have color edges. Test Point Adj. Point Mode C.P. Magnet (RB) C.P. Magnet (RB-G) Deflection Yoke Tape M.
Page 28: How To Initialize The Tv/Dvd/Vcr
HOW TO INITIALIZE THE TV/DVD/VCR To put the program back at the factory-default, initialize the TV/DVD/VCR as the following procedure. < DVD Section > 1. Turn the power on and press [SELECT] button on the remote control unit to put the TV/DVD/VCR into DVD mode.
Page 29: Firmware Renewal Mode
FIRMWARE RENEWAL MODE 1. Turn the power on and press [SELECT] button on the remote control unit to put the TV/DVD/VCR into DVD mode. Then remove the disc on the tray. (It is possible to move to F/W version up mode only when the TV/DVD/VCR is in DVD mode with the tray open.) 2.
Page 30: Block Diagrams
BLOCK DIAGRAMS < TV/VCR Section > System Control / Servo Block Diagram 1-10-1 T2202BLS...
Page 31 Video Block Diagram 1-10-2 T2202BLV...
Page 32 Audio Block Diagram 1-10-3 T2202BLA...
Page 33 Hi-Fi Audio Block Diagram 1-10-4 T2202BLH...
Page 34 TV Process Block Diagram 1-10-5 T2202BLT...
Page 35 CRT/H.V. Block Diagram 1-10-6 T2202BLCRT...
Page 36 Power Supply Block Diagram 1-10-7 T2202BLP...
Page 37 BLOCK DIAGRAMS < DVD Section > DVD System Control / Servo Block Diagram 1-10-8 T2202BLSD...
Page 38 Digital Signal Process Block Diagram 1-10-9 T2202BLD...
Page 39: Schematic Diagrams / Cba's And Test Points
SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS Standard Notes WARNING Many electrical and mechanical parts in this chassis have special characteristics. These characteristics often pass unnoticed and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc.
Page 40 LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING PAGES: 1. CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE_A,_V FUSE. ATTENTION: UTILISER UN FUSIBLE DE RECHANGE DE MÊME TYPE DE_A,_V. 2.
Page 41 Main 1/6 & Sensor Schematic Diagram < TV/VCR Section > T2202SCM1 1-11-3...
Page 42 Main 2/6 Schematic Diagram < TV/VCR Section > T2202SCM2 1-11-4...
Page 43 Main 3/6 Schematic Diagram < TV/VCR Section > T2202SCM3 1-11-5...
Page 44 Main 4/6 Schematic Diagram < TV/VCR Section > 1-11-6 T2202SCM4...
Page 45 Main 5/6 & Junction-A Schematic Diagram < TV/VCR Section > T2202SCM5 1-11-7...
Page 46 Main 6/6 Schematic Diagram < TV/VCR Section > CAUTION ! Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. If Main Fuse (F1601) is blown , check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply.
Page 47 Sub 1/2 Schematic Diagram < TV/VCR Section > 1-11-9 T2202SCSUB1...
Page 48 Sub 2/2 Schematic Diagram < TV/VCR Section > T2202SCSUB2 1-11-10...
Page 49 CRT Schematic Diagram < TV/VCR Section > T2202SCCRT Function & Junction-B Schematic Diagram < TV/VCR Section > T2202SCF 1-11-11...
Page 50 DVD Main 1/3 Schematic Diagram < DVD Section > T2202SCD1 1-11-12...
Page 51 DVD Main 2/3 Schematic Diagram < DVD Section > T2202SCD2 1-11-13...
Page 52 DVD Main 3/3 Schematic Diagram < DVD Section > T2202SCD3 1-11-14...
Page 53 Main CBA Top View < TV/VCR Section > Because a hot chassis ground is present in the power supply circuit, an isolation transformer must be used. Also, in order to have the ability to increase the input slowly,when troubleshooting this type power supply circuit, a variable isolation transformer is required.
Page 54 Main CBA Bottom View < TV/VCR Section > Because a hot chassis ground is present in the power supply circuit, an isolation transformer must be used. Also, in order to have the ability to increase the input slowly,when troubleshooting this type power supply circuit, a variable isolation transformer is required.
Page 55 Sub CBA Top View < TV/VCR Section > 1-11-17 TP2504 VR2530 PIN C. VR2531 H SIZE TP2501 R2583 (H f Adjustment) BT1200F01023-A...
Page 56 Sub CBA Bottom View < TV/VCR Section > WF17 WF18 WF19 TP2513 TP2512 PIN18 OF CN2503 DVD-Y DVD-C WF10 WF11 WF20 PIN2 Q2571 PIN 5 Collector CN2571 OF CN2 1-11-18 BT1200F01023-A...
Page 57 CRT CBA Top View < TV/VCR Section > CRT CBA Bottom View < TV/VCR Section > WF12 WF13 Q2503 Q2502 Collector Collector 1-11-19 WF14 Q2501 Collector BT1200F01023-B...
Page 58 Function CBA Top View < TV/VCR Section > Function CBA Bottom View < TV/VCR Section > Junction-A CBA Top View < TV/VCR Section > Junction-B CBA Top View < TV/VCR Section > BT1200F01023-C 1-11-20 Junction-A CBA Bottom View < TV/VCR Section > BT1200F01023-D Junction-B CBA Bottom View...
Page 59: Waveforms
WAVEFORMS X7TWF 1-12-1...
Page 60: Wiring Diagram < Tv/Vcr Section
WIRING DIAGRAM < TV/VCR Section > +180V HEATER 1-13-1 T2202WIT...
Page 61: Wiring Diagram < Dvd Section
WIRING DIAGRAM < DVD Section > T2202WID 1-13-2...
Page 62: System Control Timing Charts
SYSTEM CONTROL TIMING CHARTS < TV/VCR Section > Mode SW: LD-SW LD-SW Position detection A/D Input voltage Limit (Calculated voltage) 3.76 V ~ 4.50 V (4.12 V) 4.51 V ~ 5.00 V (5.00 V) 0.00 V ~ 0.25 V (0.00 V) 1.06 V ~ 1.50 V (1.21 V) 0.66 V ~ 1.05 V (0.91 V) 1.99 V ~ 2.60 V (2.17 V)
Page 63 Chart 1 1) SP MODE 18 RF-SW F-AD ( Internal Signal ) C-DRIVE Acceleration Detection PB CTL 66 C-F/R ROLL COMPENSATION (DRUM SERVO) H-A-SW 15 ROTA The first rise of RF-SW after a rise in F-AD signal. "H" "H" "Z" STILL FRAME ADVANCE 1-14-2...
Page 64 Chart 2 2) LP/EP MODE 18 RF-SW F-AD ( Internal Signal ) C-DRIVE Acceleration Detection PB CTL 66 C-F/R ROLL COMPENSATION (DRUM SERVO) H-A-SW 15 ROTA STILL The first rise of RF-SW after a rise in F-AD signal. "H" "H" "Z"...
Page 65 Chart 3 1-14-4 EJECT ST-S/ END-S "OFF" CASS.LOAD LD-FWD 0.2S LD-REV SFT-SW STOP(B) POWER LD-FWD 0.4S 0.2S LD-REV 0.2S LD-FWD 0.5S LD-REV STOP(A) PLAY LD-FWD PLAY LD-FWD RS1(RS2) LD-REV 0.2S LD-FWD FS1(FS2) PLAY PLAY PAUSE (SLOW) LD-FWD STILL(SLOW) PLAY LD-REV 0.2S LD-FWD PLAY...
Page 66 Chart 4 STOP 1-14-5 STOP(A) LD-REV 0.2S LD-FWD 0.2S STOP /EJECT 1.0S LD-FWD 0.5S LD-REV STOP(A) LD-REV 0.2S LD-FWD 0.2S STOP /EJECT LD-REV 1.0S LD-FWD 0.5S LD-REV STOP(A) LD-FWD PAUSE LD-FWD 2.5S Short REV LD-REV 0.2S LD-FWD REC PAUSE REC or PAUSE STOP /EJECT...
Page 67 < DVD Section > Tray Close ~ Play / Play ~ Tray Open Tray Close 3.3V Tray IN (TL221) Sled Drive 1.65V (TP303) Disc Drive 1.65V (TP301) 1.65V Focus Drive (TP304) Tracking Drive 1.65V (TP302) Disc Play Rotation 1-14-6 Disc Tray Stop Open...
Page 68: Ic Pin Function Descriptions
IC PIN FUNCTION DESCRIPTIONS IC1201 (TV/VCR Micro Controller IC) “H” ≥ 4.5 V, “L” ≤ 1.0 V Signal Function Name IN LD-SW Loading Switch Input OUT DVD-LED DVD LED Control Output P-SAFETY Power Supply Failure Detection 2 Tuner Stereo/Sap Detector IN ST/SAP-IN Signal Input IN KEY0...
Page 69 Signal Function Name Capstan Motor FWD/REV 66 OUT C-F/R Control Signal D-REC Delayed Record/Playback 67 OUT /PB-H Control Signal 68 OUT YCA-SDA YCA Serial Data 69 OUT YCA-CS YCA Chip Select 70 OUT YCA-SCL YCA Serial Clock 71 OUT SCL Serial Clock Serial Data Not Used...
Page 70: Lead Identifications
LEAD IDENTIFICATIONS 2SK3561 MID-32A22F S D G LA78041-E AN17812A KIA431-AT/P KIA7805API/P 1: R 1: IN 2: A 2: GND 3: K 3: OUT 1 2 3 1 2 3 LTV-817C-F 1: A LA71205M-MPB-E 2: K LA72670BM-MPB-E 3: E 4: C CAT24WC02WI-TE13 2SC2785(F) KRA103M-AT/P...
Page 71: Exploded Views
Cabinet Details for L551 and surrounding parts Scotch Tape #880 CLN551 CLN551 CLN551 V501 SP801 A1-1 Junction-B CBA A1-3 A1-2 EXPLODED VIEWS SHINWHA TAPE SGT-730 (BLACK) V501-2 SHINWHA TAPE SGT-730 V501-1 (WHITE) L551 CRT CBA Scotch Tape #880 TB18 Scotch Tape #880 DG601 TL1-2...
Page 72 Packing Packing Tape Tape 1-17-2 T2203PEX...
Page 73: Mechanical Parts List
(---------) are not available. Ref. No. Description FRONT CABINET ASSEMBLY T2202UC A1-1 FRONT CABINET T2202UC A1-2 CONTROL PLATE T2202UC A1-3 BADGE BRAND T7310UL ~MAGNAVOX~ A1-4 CASSETTE DOOR T2100UA A1-5 SPRING DOOR T1200UA A1-6 CLOTH(4X7XT0.7) T5000UA A1-7 TRAY PANEL T2100UA A1-8...
Page 74: Electrical Parts List
ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a # have special characteristics important to safety. Before replacing any of these components, read carefully the product safety notice in this service manual. Don't degrade the safety of the product through improper servicing.
Page 75 Ref. No. Description C1428 CHIP CERAMIC CAP .(1608) B K 0.01µF/50V C1429 ELECTROLYTIC CAP . 47µF/6.3V M H7 C1430 CHIP CERAMIC CAP .(1608) B K 0.01µF/50V C1431 CHIP CERAMIC CAP . F Z 1µF/10V C1432 ELECTROLYTIC CAP . 1µF/50V M H7 C1435 ELECTROLYTIC CAP .
Page 76 Ref. No. Description D1224 LED SIR-563ST3F P D1229 ZENER DIODE MTZJT-7715B D1230 ZENER DIODE MTZJT-7715B D1231 ZENER DIODE MTZJT-7718A D1237 ZENER DIODE MTZJT-776.8B D1302 SWITCHING DIODE 1SS133(T-77) D1303 SWITCHING DIODE 1SS133(T-77) D1304 SWITCHING DIODE 1SS133(T-77) CARBON RES. 1/4W J 15 Ω D1305 D1351 SWITCHING DIODE 1SS133(T-77)
Page 77 Ref. No. Description CHIP RES. 1/16W G 22k Ω R1202 CHIP RES. 1/16W G 470 Ω R1203 CHIP RES. 1/16W G 1.5k Ω R1204 CHIP RES. 1/16W G 3.6k Ω R1205 CHIP RES. 1/16W G 10k Ω R1206 CHIP RES.(1608) 1/10W 0 Ω R1207 CHIP RES.
Page 78 Ref. No. Description CARBON RES. 1/4W J 180k Ω R1608 CARBON RES. 1/4W J 1.5 Ω R1609# CARBON RES. 1/4W J 1.8k Ω R1610 CARBON RES. 1/4W J 150 Ω R1613 CARBON RES. 1/4W J 1.2k Ω R1614 CARBON RES. 1/4W J 180 Ω R1617 R1618 PCB JUMPER D0.6-P5.0...
Page 79 Ref. No. Description SCREW B-TIGHT D3X8 BIND HEAD+ TP1202 PCB JUMPER D0.6-P16.0 TP1301 PCB JUMPER D0.6-P9.0 TP1302 PCB JUMPER D0.6-P8.0 TP1303 PCB JUMPER D0.6-P8.5 TP1304 PCB JUMPER D0.6-P5.0 TP1305 PCB JUMPER D0.6-P5.0 TP1306 PCB JUMPER D0.6-P11.5 TP1401 PCB JUMPER D0.6-P13.5 TP1402 PCB JUMPER D0.6-P17.5 TP1403...
Page 80 Ref. No. Description L2701 PCB JUMPER D0.6-P5.0 TRANSISTORS Q2201 TRANSISTOR 2SC2785(F) Q2202 TRANSISTOR 2SC2785(F) Q2203 TRANSISTOR 2SC2785(F) Q2530# TRANSISTOR 2SD1666R Q2531 TRANSISTOR 2SA1175(F) Q2532 TRANSISTOR 2SC2785(F) Q2533 TRANSISTOR 2SC2785(F) Q2571# TRANSISTOR 2SC5978 Q2591# TRANSISTOR 2SC3708S Q2592# TRANSISTOR 2SC2785(F) Q2610 TRANSISTOR 2SA1175(F) Q2611 TRANSISTOR KTC3199-Y-AT/P Q2612...
Page 81 Ref. No. Description CARBON RES. 1/4W J 1.2 Ω R3568# CARBON RES. 1/4W J 150 Ω R3576 R3580 PCB JUMPER D0.6-P5.0 MISCELLANEOUS BC2501 BEAD INDUCTORS FBA04HA600VB-00 CL2601 LEAD WIRE 5P 370MM X7 H/V HEAT SINK PLH ASSEMBLY T2200UA SCREW B-TIGHT D3X8 BIND HEAD+ JK2701 JACK RCA PCB L MSP-241V-05 NI LFW/O T2571#...
Page 82 MWC24T5 T2202UC 2006-04-06...

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