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FUNAI 31B-250 Service Manual

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Table of Contents

See also: Owner's Manual
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
31B-250
When servicing the deck
mechanism, refer to MK14 Deck
Mechanism Section.
Deck Mechanism Part No.:
N25A0FL
PAL

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Summary of Contents for FUNAI 31B-250

  • Page 1 When servicing the deck 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 N25A0FL I Parts List VIDEO CASSETTE RECORDER 31B-250...
  • Page 2 MAIN SECTION VIDEO CASSETTE RECORDER 31B-250 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 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-3) (S-2) (S-4) (S-3) (S-2) [3]VCR Chassis Unit Fig. D3 1-5-2 HK21VDC...
  • 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-6) Fig. D6 (S-6) 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

    FUNCTION INDICATOR SYMBOLS Note: 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 TAPE IN "...
  • 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 HK21VBLS 1-9-1...
  • Page 19 Video Block Diagram HK21VBLV 1-9-2...
  • Page 20 Audio Block Diagram HK21VBLA 1-9-3...
  • Page 21 Power Supply Block Diagram HK21VBLP 1-9-4...
  • Page 22 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 1/5 Schematic Diagram 1-10-3 HK21VSCM1...
  • Page 25 Main 2/5 & Sensor Schematic Diagram 1-10-4 HK21VSCM2...
  • Page 26 Main 3/5 Schematic Diagram 1-10-5 HK21VSCM3...
  • Page 27 Main 4/5 & Jack Schematic Diagram 1-10-6 HK21VSCM4...
  • Page 28 Main 5/5 Schematic Diagram NOTE: CAUTION ! 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. hot GND as a common terminal. replace only with the same type fuse.
  • Page 29 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 30 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 31 Jack CBA Top View Jack CBA Bottom View 1-10-10 BHG470F01015C...
  • Page 32 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 U29.5PWF 1-11-1...

  • Page 33: Wiring Diagram

    WIRING DIAGRAM 1-12-1 HK21VWI...

  • Page 34: Ic Pin Function Descriptions

    IC PIN FUNCTION DESCRIPTIONS IC501( SERVO / SYSTEM CONTROL IC ) Signal Active Function Name Level “H” ≥ 4.5V, “L” ≤ 1.0V “TIMER” LED 25 OUT TIMER-LED Signal Active Signal Output Function Name Level “REC” LED Signal Input Signal from 26 OUT REC-LED IN SC2-IN Output...
  • Page 35 Signal Active Signal Active Function Function Name Level Name Level Not Used Capstan Motor IN C-FG Rotation PULSE Not Used Detection Pulse Composite Not Used IN C-SYNC PULSE Synchronized Pulse Not Used SCART 18Pin Drum Motor Pulse IN D-PFG PULSE 59 OUT 8POUT-1 Output Control Generator...

  • Page 36: Lead Identifications

    LEAD IDENTIFICATIONS KRA103M-AT/P 2SA1015-(GR)(TE2 F T) BU4052BCF-E2 CD4052BCSJX_NL KRC103M-AT/P 2SA1020-Y(TE6 F M) CD4052BNSR KTA-1266-GR-AT/P 2SC1815-BL(TE2 F T) TC4052BF(ELNF) KTA1267-(GR,Y)-AT/P 2SC1815-Y(TE2 F T) KTC3199-(BL,GR,Y)-AT/P 2SC2120-Y(TE2 F T) RN2204(TE4 F T) KTA1281Y-AT/P KTC3203-Y-AT/P E C B E C B BR24L02F-WE2 MID-32A22F 2SK3566 LA71750EM-MPB-E CAT24WC02WI-TE13 PT204-6B-12...

  • Page 37: Exploded Views

    EXPLODED VIEWS Front Panel 1-15-1 HK21VFEX...
  • Page 38 Cabinet 2L011 2B18 2L011 2L011 See Electrical Parts List for parts with this mark. Some Ref. Numbers are not in sequence. 2L011 JACK CBA 2L011 2L012 2L022 2L042 2L021 2L021 2L021 2L051 2L021 2L022 2L041 2L021 SENSOR CBA 2L031 2L041 2L099 2B46 MAIN CBA...
  • Page 39 Packing Some Ref. Numbers are not in sequence. Unit 1-15-3 HK21VPEX...

  • Page 40: Mechanical Parts List

    MECHANICAL 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 41: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. ! have special characteristics important to safety. C025 CHIP CERAMIC CAP .(1608) B K 0.01µF/50V CHD1JK30B103 Before replacing any of these components, read C026 ELECTROLYTIC CAP . 47µF/16V M H7 or CE1CMAVSL470 carefully the product safety notice in this service ALUMINUM ELECTROLYTIC CAP 47µF/16V H7 CE1CMAVSM470...
  • Page 42 Ref. No. Description Part No. Ref. No. Description Part No. ALUMINUM ELECTROLYTIC CAP 10µF/16V H7 CE1CMAVSM100 ALUMINUM ELECTROLYTIC CAP 4.7µF/25V CE1EMAVSM4R7 C323 CHIP CERAMIC CAP .(1608) F Z 0.1µF/50V or CHD1JZ30F104 C423 CHIP CERAMIC CAP .(1608) F Z 0.1µF/50V or CHD1JZ30F104 CHIP CERAMIC CAP .(1608) F Z 0.1µF/25V CHD1EZ30F104...
  • Page 43 Ref. No. Description Part No. Ref. No. Description Part No. C704 CHIP CERAMIC CAP .(1608) B K 0.01µF/50V CHD1JK30B103 D155 ZENER DIODE DZ-11BSAT265 or NDTA00DZ11BS C706 CHIP CERAMIC CAP .(1608) F Z 0.1µF/50V or CHD1JZ30F104 ZENER DIODE MTZJT-7711A QDTA00MTZJ11 CHIP CERAMIC CAP .(1608) F Z 0.1µF/25V CHD1EZ30F104 D301 SWITCHING DIODE 1N4148M or...
  • Page 44 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/6W J 470k Ω or Q051 TRANSISTOR RN2204(TE4 F T) QQSZ0RN2204F R013 RCX6JATZ0474 CARBON RES. 1/4W J 470k Ω Q052 NPN TRANSISTOR KRC103M-AT/P NQSZKRC103MP RCX4JATZ0474 CARBON RES. 1/6W J 100k Ω or Q054 TRANSISTOR KTC3203-Y -AT/P or NQSYKTC3203P...
  • Page 45 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/6W J 33 Ω or CHIP RES. 1/10W J 68k Ω R321 RCX6JATZ0330 R531 RRXAJR5Z0683 CARBON RES. 1/4W J 33 Ω CHIP RES. 1/10W J 33k Ω RCX4JATZ0330 R533 RRXAJR5Z0333 CARBON RES.
  • Page 46 Ref. No. Description Part No. Ref. No. Description Part No. SW504 TACT SWITCH KSM0614B or SST0101HH013 C112 CHIP CERAMIC CAP .(1608) CH J 470pF/50V CHD1JJ3CH471 TACT SWITCH SKQSAF001A or SST0101AL041 C113 CHIP CERAMIC CAP . B K 2200pF/50V CHD1JK30B222 TACT SWITCH TC-1104(H=9.5) SST0101DNG01 C115 ELECTROLYTIC CAP .
  • Page 47 SENSOR CBA Ref. No. Description Part No. SENSOR CBA 0VSA14893 Consists of the following: TRANSISTORS Q504 PHOTO TRANSISTOR PT204-6B-12 or NPWZT2046B12 PHOTO TRANSISTOR MID-32A22F NPWZ1D32A22F Q505 PHOTO TRANSISTOR PT204-6B-12 or NPWZT2046B12 PHOTO TRANSISTOR MID-32A22F NPWZ1D32A22F 20060216 1-17-7 HK21VEL...
  • Page 48 31B-250 HK21VBD 2006-3-16...

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