FUNAI 31A-250 Service Manual
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FUNAI 31A-250 Service Manual

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SERVICE MANUAL
Main Section
I Specifications
I Preparation for Servicing
I Adjustment Procedures
I Schematic Diagrams
I CBA's
I Exploded views
I Parts List
VIDEO CASSETTE RECORDER
31A-250/31D-250
31C-250
When servicing the deck
mechanism, refer to MK14 Deck
Mechanism Section.
Deck Mechanism Part No.:
31A-250/31D-250: N25A0FL
31C-250: N25A1FL
PAL
PAL
SECAM

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Summary of Contents for FUNAI 31A-250

  • Page 1 I Specifications mechanism, refer to MK14 Deck I Preparation for Servicing Mechanism Section. I Adjustment Procedures I Schematic Diagrams Deck Mechanism Part No.: I CBA’s I Exploded views 31A-250/31D-250: N25A0FL I Parts List 31C-250: N25A1FL VIDEO CASSETTE RECORDER 31A-250/31D-250 31C-250 SECAM...

  • Page 2: Table Of Contents

    MAIN SECTION VIDEO CASSETTE RECORDER 31A-250/31C-250/31D-250 Sec. 1: Main Section I Specifications I Preparation for Servicing I Adjustment Procedures I Schematic Diagrams I CBA’s I Exploded Views I Parts List TABLE OF CONTENTS Specifications ............... . . 1-1-1 Important Safety Precautions .

  • Page 3: Specifications

    SPECIFICATIONS Description Unit Minimum Nominal Maximum Remark 1. Video 1-1. Video Output (PB) Vp-p FL6A 1-2. Video Output (R/P) Vp-p SP Mode, 1-3. Video S/N Y (R/P) W/O Burst 1-4. Video Color S/N AM (R/P) SP Mode 1-5. Video Color S/N PM (R/P) SP Mode 1-6.

  • Page 4: Important Safety Precautions

    IMPORTANT SAFETY PRECAUTIONS Product Safety Notice K. Crimp type wire connector The power transformer uses crimp type connectors Some electrical and mechanical parts have special which connect the power cord and the primary side safety-related characteristics which are often not evi- of the transformer.

  • Page 5: Safety Check After Servicing

    Safety Check after Servicing Chassis or Secondary Conductor Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts, and wires have been returned to their original Primary Circuit positions. Afterwards, do the following tests and con- firm the specified values to verify compliance with safety standards.

  • Page 6: Standard Notes For Servicing

    STANDARD NOTES FOR SERVICING Circuit Board Indications Pb (Lead) Free Solder 1. The output pin of the 3 pin Regulator ICs is When soldering, be sure to use the Pb free solder. indicated as shown. How to Remove / Install Flat Pack-IC Top View Bottom View 1.
  • Page 7 3. The flat pack-IC on the CBA is affixed with glue, so With Soldering Iron: be careful not to break or damage the foil of each 1. Using desoldering braid, remove the solder from pin or the solder lands under the IC when all pins of the flat pack-IC.
  • Page 8 2. Installation With Iron Wire: 1. Using desoldering braid, remove the solder from 1. Using desoldering braid, remove the solder from all pins of the flat pack-IC. When you use solder the foil of each pin of the flat pack-IC on the CBA flux which is applied to all pins of the flat pack-IC, so you can install a replacement flat pack-IC more you can remove it easily.
  • Page 9 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 10: Preparation For Servicing

    PREPARATION FOR SERVICING How to Enter the Service Mode About Optical Sensors Caution: An optical sensor system is used for the Tape Start and End Sensors on this equipment. Carefully read and follow the instructions below. Otherwise the unit may operate erratically. What to do for preparation Insert a tape into the Deck Mechanism Assembly and press the PLAY button.

  • Page 11: Cabinet Disassembly Instructions

    CABINET DISASSEMBLY INSTRUCTIONS 1. Disassembly Flowchart (1): Identification (location) No. of parts in the figures (2): Name of the part This flowchart indicates the disassembly steps to gain (3): Figure Number for reference access to item(s) to be serviced. When reassembling, (4): Identification of parts to be removed, unhooked, follow the steps in reverse order.
  • Page 12 (L-2) [4] Jack CBA (L-2) (S-5) Desolder [2] Front Assembly Fig. D4 (L-1) Fig. D2 (S-2) (S-2) (S-3) (S-2) (S-4) [3]VCR Chassis (S-3) Unit (S-2) Fig. D3 1-5-2 HM340DC...
  • Page 13 [7] Cylinder Shield Cylinder Assembly FE Head (S-7) SW507 ACE Head LD-SW Assembly [6] Main CBA [5] Deck [5] Deck Assembly Assembly Cam Gear Hole Shaft Hole [6] Main CBA LD-SW [6] Main CBA (S-6B) Fig. D6 (S-6A) TOP VIEW From Capstan Motor From...

  • Page 14: Electrical Adjustment Instructions

    ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: "CBA" is an abbreviation for Head Switching Position Adjustment "Circuit Board Assembly." Purpose: NOTE: To determine the Head Switching position during 1.Electrical adjustments are required after replacing playback. circuit components and certain mechanical parts. Symptom of Misadjustment: It is important to do these adjustments only after all repairs and replacements have been com- May cause Head Switching noise or vertical jitter...

  • Page 15: How To Initialize The Vcr

    HOW TO INITIALIZE THE VCR To put the program back at the factory-default, initialize the VCR as the following procedure. 1. Make sure that no timer programming is set. If not, reset all timer programming. 2. Turn the power off. 3.

  • Page 16: Function Indicator Symbols

    The following symbols will appear on the indicator panel to indicate the current mode or operation of the VCR. On-screen modes will also be momentarily displayed on the tv screen when you press the operation buttons. Display panel 31A-250 / 31D-250 STANDBY FUNCTION...
  • Page 17 TV screen Note: OSD for mechanical error will be displayed for 5 sec. after the mechanical error occurs. Cause Indicator Active When reel or capstan mechanism is not “A R” is displayed on a TV screen. (Refer to Fig. 1.) functioning correctly When tape loading mechanism is not “A T”...

  • Page 18: Block Diagrams

    BLOCK DIAGRAMS Servo / System Control Block Diagram HM240BLS 1-9-1...
  • Page 19 Video Block Diagram HM240BLV 1-9-2...
  • Page 20 Audio Block Diagram HM240BLA 1-9-3...
  • Page 21 Power Supply Block Diagram HM240BLP 1-9-4...

  • Page 22: 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 23 LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING PAGES: 1. CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE. 2. CAUTION: Fixed Voltage (or Auto voltage selectable) power supply circuit is used in this unit. If Main Fuse (F001) is blown, first 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 24 Main 1/6 Schematic Diagram Comparison Chart of Models and Marks MODEL MARK 31A-250 31C-250 31D-250 1-10-3 HM240SCM1...
  • Page 25 Main 2/6 & Sensor Schematic Diagram Comparison Chart of Models and Marks MODEL MARK 31A-250 31C-250 31D-250 1-10-4 HM240SCM2...
  • Page 26 Main 3/6 Schematic Diagram Comparison Chart of Models and Marks MODEL MARK 31A-250 31C-250 31D-250 1-10-5 HM240SCM3...
  • Page 27 Main 4/6 & Jack Schematic Diagram 1-10-6 HM240SCM4...
  • Page 28 Main 5/6 Schematic Diagram CAUTION ! NOTE: CAUTION ! For continued protection against fire hazard, The voltage for parts in hot circuit is measured using Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. replace only with the same type fuse. hot GND as a common terminal.
  • Page 29 Main 6/6 Schematic Diagram ( B ) Comparison Chart of Models and Marks MODEL MARK 31A-250 31C-250 31D-250 1-10-8 HM242SCM6...
  • Page 30 Main CBA Top View CAUTION ! Because a hot chassis ground is present in the power CAUTION ! For continued protection against fire hazard, Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. supply circut, an isolation transformer must be used. If Main Fuse (F001) is blown , check to see that all components in the power supply Also, in order to have the ability to increase the input replace only with the same type fuse.
  • Page 31 Main CBA Bottom View CAUTION ! Because a hot chassis ground is present in the power CAUTION ! For continued protection against fire hazard, Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. supply circut, an isolation transformer must be used. If Main Fuse (F001) is blown , check to see that all components in the power supply Also, in order to have the ability to increase the input replace only with the same type fuse.
  • Page 32 Jack CBA Top View Jack CBA Bottom View 1-10-11 BHM450F01011C...

  • Page 33: Waveforms

    WAVEFORMS NOTE: Input VCR: COLOR BAR SIGNAL (WITH 1KHz AUDIO SIGNAL) (WF1~WF3) TP301 UPPER TP502 LOWER C-PB 10mV x 10 RF-SW 0.5V x 10 UPPER TP502 LOWER V-OUT 0.1V x 10 RF-SW 0.5V x 10 50µs V-OUT E-E 10µs 50mV x 10 U31PWF 1-11-1...

  • Page 34: Wiring Diagram

    WIRING DIAGRAM 1-12-1 HM240WI...

  • Page 35: Ic Pin Function Descriptions

    Comparison Chart of Models and Marks Signal Active Mark Function Name Level Model Mark Not Used 31A-250 Video Head 31C-250 OUT RF-SW Switching Pulse 31D-250 Not Used Not Used IC501( SERVO / SYSTEM CONTROL IC ) Not Used “H” ≥ 4.5V, “L” ≤ 1.0V...
  • Page 36 Signal Active Signal Active Mark Function Mark Function Name Level Name Level Vss(GND) Not Used Not Used Special Playback = “H” OUT TRICK-H Not Used in SECAM Mode Clock Select IN CLKSEL (GND) Not Used Clock Input for Capstan Power IN OSCin C-POW- letter size...
  • Page 37 Signal Active Mark Function Name Level Not Used Drum Motor IN D-PFG Pulse PULSE Generator AMPVRE V-Ref for CTL F OUT AMPVRE V-Ref for CTL P80/C P80/C Terminal Playback/ CTL (-) Record Control Signal (-) Playback/ CTL (+) Record Control Signal (+) CTL AMP AMPC...

  • Page 38: Lead Identifications

    LEAD IDENTIFICATIONS KRA103M-AT/P 2SA1015-GR(TE2 F T) LA70100M-TRM-E KRC103M-AT/P 2SA1020-Y(TE6 F M) KTA-1266-GR-AT/P 2SC1815-(BL,GR,Y)(TE2 F T) KTA1267-(GR,Y)-AT/P 2SC2120-Y(TE2 F T) KTC3199-(BL,GR,Y)-AT/P KTA1281Y-AT/P RN2204(TE4 F T) KTC3203-Y-AT/P E C B E C B BR24L02F-WE2 MID-32A22F 2SK3566 EL817(A,B) CAT24WC02WI-TE13 PT204-6B-12 LTV-817-B-F PS2561A-1(Q,W) 1: Anode 2: Cathode 3: Emitter 4: Collector...

  • Page 39: Exploded Views

    EXPLODED VIEWS Front Panel 1-15-1 HM340FEX...
  • Page 40 2L011 JACK CBA 2L011 2L012 2L022 2L042 2L021 2L021 2L021 2L051 2L021 2L022 2L041 2L021 SENSOR CBA 2L031 2L041 2L099 2B46 MAIN CBA Comparison Chart of Models and Marks Model Mark 31A-250 [ C ] 31C-250 31D-250 1-15-2 HM240CEX...
  • Page 41 [ A ] [ A,C ] X20D X20C X20B X20A X20J X20H X20G X20F X20E SERIAL NO. [ B ] Unit Some Ref. Numbers are not in sequence. Comparison Chart of Models and Marks Model Mark 31A-250 31C-250 31D-250 1-15-3 HM240PEX...

  • Page 42: Mechanical Parts List

    Comparison Chart of Models and Marks X20F! OWNERS MANUAL(ES) HM240ED 1VMN22932 X20F! OWNERS MANUAL(CS) HM343ED 1VMN22367 Model Mark X20G! OWNERS MANUAL(PT) HM240ED 1VMN22933 31A-250 X20G! OWNERS MANUAL(RU) HM343ED 1VMN22368 31C-250 X20H! OWNERS MANUAL(FI) HM240ED 1VMN22934 31D-250 X20H! OWNERS MANUAL(AR) HM343ED 1VMN22369...

  • Page 43: Electrical Parts List

    ELECTROLYTIC CAP . 220µF/6.3V M H7 CE0KMASSM221 C056 CHIP CERAMIC CAP .(1608) B K 0.047µF/ CHD1JK30B473 Model Mark 50V or 31A-250 CHIP CERAMIC CAP .(1608) B K 0.047µF/ CHD1EK30B473 31C-250 C057 CHIP CERAMIC CAP .(1608) CH J 470pF/ CHD1JJ3CH471 31D-250 C151 CHIP CERAMIC CAP .(1608) F Z 0.1µF/...
  • Page 44 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. ALUMINUM ELECTROLYTIC CAP 1µF/ CE1JMAVSM1R0 C333 ELECTROLYTIC CAP . 0.47µF/50V M H7 CE1JMAVSLR47 50V H7 C305 CHIP CERAMIC CAP . F Z 0.22µF/16V CHD1CZ30F224 ALUMINUM ELECTROLYTIC CAP CE1JMAVSMR47 0.47µF/50V H7 C307 CHIP CERAMIC CAP .(1608) B K 0.047µF/...
  • Page 45 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. C383 CHIP CERAMIC CAP . B K 2200pF/50V CHD1JK30B222 C511 ELECTROLYTIC CAP . 100µF/6.3V H7 or CE0KMAVSL101 C384 ELECTROLYTIC CAP . 2.2µF/50V M H7 or CE1JMAVSL2R2 ALUMINUM ELECTROLYTIC CAP CE0KMAVSM101 100µF/6.3V H7 ALUMINUM ELECTROLYTIC CAP 2.2µF/...
  • Page 46 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. ALUMINUM ELECTROLYTIC CAP 1µF/ CE1JMAVSM1R0 RECTIFIER DIODE 1N4005 NDWZ001N4005 50V H7 D056 ZENER DIODE DZ-5.6BSCT265 or NDTC0DZ5R6BS C710 CHIP CERAMIC CAP .(1608) B K 1000pF/ CHD1JK30B102 ZENER DIODE MTZJT-775.6C QDTC0MTZJ5R6 CARBON RES.
  • Page 47 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CARBON RES. 1/6W G 680 Ω or L704 INDUCTOR 15µH-K-26T LLAXKATTU150 R005 RCX6GATZ0681 CARBON RES. 1/4W G 680 Ω L851 INDUCTOR 1.8µH-K-26T LLAXKATTU1R8 RCX4GATZ0681 METAL OXIDE FILM RES. 1W J 1.8 Ω or TRANSISTORS R006 RN011R8ZU001...
  • Page 48 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CARBON RES. 1/4W J 680 Ω CHIP RES. 1/10W J 10k Ω or R068 RCX4JATZ0681 R331 RRXAJR5Z0103 CARBON RES. 1/4W J 8.2k Ω RES CHIP 1608 1/10W J 10k Ω R071 RCX4JATZ0822 RRXA103YF002...
  • Page 49 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. RES CHIP 1608 1/10W J 68k Ω CARBON RES. 1/4W G 1.5k Ω RRXA683YF002 RCX4GATZ0152 CHIP RES. 1/10W J 12k Ω or CARBON RES. 1/6W G 4.7k Ω or R428 RRXAJR5Z0123 R539...
  • Page 50 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CARBON RES. 1/6W J 1k Ω or R703 RCX6JATZ0102 VR501 CARBON P .O.T. VZ067TL1 B104 PB(F) VRCB104HH014 CARBON RES. 1/4W J 1k Ω RCX4JATZ0102 X301 XTAL 4.433619MHz or FXC445LLN004 CARBON RES.
  • Page 51 Ref. No. Mark Description Part No. CARBON RES. 1/4W J 4.7k Ω RCX4JATZ0472 CARBON RES. 1/6W J 4.7k Ω or R115 RCX6JATZ0472 CARBON RES. 1/4W J 4.7k Ω RCX4JATZ0472 CARBON RES. 1/6W J 15k Ω or R116 RCX6JATZ0153 CARBON RES. 1/4W J 15k Ω RCX4JATZ0153 CHIP RES.
  • Page 52 31A-250/31C-250/31D-250 HM240ED/242FD/243ED 2006-05-26...

This manual is also suitable for:

31d-25031c-250

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