FUNAI 31C-850 Service Manual
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FUNAI 31C-850 Service Manual

FUNAI 31C-850 Service Manual

Video cassette recorder
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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
When servicing the deck
mechanism, refer to MK14 Deck
Mechanism Section.
Deck Mechanism Part No.:
N25E0FL
31C-850
31D-864
PAL
PAL
SECAM

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Summary of Contents for FUNAI 31C-850

  • Page 1 Main Section 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 N25E0FL I Parts List VIDEO CASSETTE RECORDER 31C-850 31D-864 SECAM...

  • Page 2: Table Of Contents

    MAIN SECTION VIDEO CASSETTE RECORDER 31C-850/31D-864 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 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-3) (S-4) [3]VCR Chassis (S-3) Unit (S-2) Fig. D3 1-5-2 HM4N0DC...
  • 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 [8] Jack Board Assembly (L-3) Cam Gear Hole Shaft Hole [6] Main CBA LD-SW [6] Main CBA (S-6) Fig. D6 (S-6) TOP VIEW 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 MODE INDICATOR ACTIVE...
  • 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 HM453BLS 1-9-1...
  • Page 19 Video Block Diagram HM453BLV 1-9-2...
  • Page 20 Audio Block Diagram HM453BLA 1-9-3...
  • Page 21 Hi-Fi Audio Block Diagram HM453BLH 1-9-4...
  • Page 22 Power Supply Block Diagram HM453BLP 1-9-5...

  • Page 23: 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 24 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 25 Main 1/8 Schematic Diagram Comparison Chart of Models and Marks MODEL MARK 31C-850 31D-864 1-10-3 HM453SCM1...
  • Page 26 Main 2/8 & Sensor Schematic Diagram FP562 MATRIX CHART Comparison Chart of Models and Marks MODEL MARK 31C-850 31D-864 1-10-4 HM453SCM2...
  • Page 27 Main 3/8 Schematic Diagram Comparison Chart of Models and Marks MODEL MARK 31C-850 31D-864 1-10-5 HM453SCM3...
  • Page 28 Main 4/8, Jack & Sub Jack Schematic Diagram 1-10-6 HM453SCM4...
  • Page 29 Main 5/8 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. If Main Fuse (F001) is blown , check to see that all components in the power supply replace only with the same type fuse.
  • Page 30 Main 6/8 Schematic Diagram Comparison Chart of Models and Marks MODEL MARK 31C-850 31D-864 1-10-8 HM453SCM6...
  • Page 31 Main 7/8 Schematic Diagram ( A ) Comparison Chart of Models and Marks MODEL MARK 31C-850 31D-864 1-10-9 HM453SCM7...
  • Page 32 Main 8/8 Schematic Diagram ( B ) Comparison Chart of Models and Marks MODEL MARK 31C-850 31D-864 1-10-10 HM455SCM8...
  • Page 33 AFV Schematic Diagram Comparison Chart of Models and Marks MODEL MARK 31C-850 31D-864 HM453SCAFV 1-10-11...
  • Page 34 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 35 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 36 Jack CBA Top View Jack CBA Bottom View 1-10-14 BHM450F01011C...
  • Page 37 AFV CBA Top View AFV CBA Bottom View BE6800F01091 Sub Jack CBA Top View Sub Jack CBA Bottom View BHM450F01011B 1-10-15...

  • Page 38: 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 39: Wiring Diagrams

    WIRING DIAGRAM 1-12-1 HM453WI...

  • Page 40: Ic Pin Function Descriptions

    IC PIN FUNCTION DESCRIPTIONS Comparison Chart of Models and Marks Signal Active Mark Function Name Level Model Mark Video Head 31C-850 OUT H-A-SW Amp Switching Pulse 31D-864 Head Amp H-A- Comparator IC501( SERVO / SYSTEM CONTROL IC ) COMP Signal “H”...
  • Page 41 Signal Active Signal Active Mark Function Mark Function Name Level Name Level Vss(GND) Special Playback =”H” OUT TRICK-H Not Used in SECAM Mode Not Used Not Used Clock Select CLKSEL (GND) Capstan Power C-POW- Switching Clock Input for Signal OSCin letter size Power On OUT P-ON-H...
  • Page 42 Signal Active Mark Function Name Level Capstan Motor Rotation C-FG PULSE Detection Pulse Not Used Not Used Drum Motor 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 (+)

  • Page 43: Lead Identifications

    LEAD IDENTIFICATIONS KRA103M-AT/P 2SA1015-GR(TE2 F T) PT6958-FN-TP(L) KRC103M-AT/P 2SA1020-Y(TE6 F M) SC16458G KTA-1266-GR-AT/P 2SC1815-(BL,GR,Y)(TE2 F T) KTA1267-(GR,Y)-AT/P KTA1281Y-AT/P KTC3199-(BL,GR,Y)-AT/P KTC3203-Y-AT/P RN2204(TE4 F T) KTC3205-Y-AT/P E C B E C B BR24L02F-WE2 MID-32A22F 2SK3566 LA70100M-TRM-E LC74793JM-TLM-E CAT24WC02WI-TE13 PT204-6B-12 G D S LA71750EM-MPB-E M3776AMCA-AA4GP-U1 M3776AMCA-AA6GP-U1...

  • Page 44: Exploded Views

    EXPLODED VIEWS Front Panel 1-15-1 HM452FEX...
  • Page 45 2L011 2L011 See Electrical Parts List for parts with this mark. Some Ref. Numbers are not in sequence. 2L011 Comparison Chart of Models and Marks Model Mark 31C-850 JACK CBA 31D-864 2L011 2L012 2L022 2L042 2L021 2L021 2L021 2L051 2L021...
  • Page 46 Packing [ B ] X20A X20B X20C X20D [ A ] X20E X20F X20G X20H Some Ref. Numbers are not in sequence. [ A ] Unit Comparison Chart of Models and Marks Model Mark 31C-850 31D-864 1-15-3 HM453PEX...

  • Page 47: Mechanical Parts List

    Don't degrade the safety of the product through improper servicing. NOTE: Parts that are not assigned part numbers (---------) are not available. Comparison Chart of Models and Marks Model Mark 31C-850 31D-864 Ref. No. Mark Description Part No. FRONT ASSEMBLY HE454FD 0VM204200...

  • Page 48: Electrical Parts List

    Comparison Chart of Models and Marks CHIP CERAMIC CAP .(1608) B K 0.047µF/ CHD1EK30B473 Model Mark C057 CHIP CERAMIC CAP .(1608) CH J 470pF/ CHD1JJ3CH471 31C-850 C060 ELECTROLYTIC CAP . 10µF/16V M H7 or CE1CMAVSL100 31D-864 ALUMINUM ELECTROLYTIC CAP 10µF/ CE1CMAVSM100 16V H7 MCV CBA C061 CHIP CERAMIC CAP .(1608) F Z 0.1µF/...
  • Page 49 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. C311 CHIP CERAMIC CAP .(1608) B K 0.022µF/ CHD1JK30B223 CHIP CERAMIC CAP .(1608) F Z 0.1µF/ CHD1EZ30F104 50V or CHIP CERAMIC CAP .(1608) B K 0.022µF/ CHD1EK30B223 C338 ELECTROLYTIC CAP .
  • Page 50 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. FILM CAP .(P) 0.018µF/50V J or CA1J183MS029 ALUMINUM ELECTROLYTIC CAP 10µF/ CE1CMAVSM100 16V H7 POLYESTER FILM CAP . (PB FREE) CA2A183DT018 0.018µF/100V J C465 CHIP CERAMIC CAP .(1608) F Z 0.1µF/ CHD1JZ30F104 50V or C411...
  • Page 51 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. ALUMINUM ELECTROLYTIC CAP CE0KMAVSM221 C567 CHIP CERAMIC CAP .(1608) F Z 0.1µF/ CHD1JZ30F104 220µF/6.3V H7 50V or C502 CHIP CERAMIC CAP .(1608) F Z 0.1µF/ CHD1JZ30F104 CHIP CERAMIC CAP .(1608) F Z 0.1µF/ CHD1EZ30F104 50V or CHIP CERAMIC CAP .(1608) F Z 0.1µF/...
  • Page 52 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. RECTIFIER DIODE BA159 NDWZ000BA159 IC501 SYSCON IC M3776AMCA-AA4GP-U1 QSZAB0RMB193 D006 SWITCHING DIODE 1N4148M or NDTZ01N4148M IC501 SYSCON IC M3776AMCA-AA6GP-U1 QSZAB0RMB195 SWITCHING DIODE 1SS133(T-77) QDTZ001SS133 IC503 IC CAT24WC02WI-TE13 or NSZBA0TBG007 D007 SWITCHING DIODE 1N4148M or...
  • Page 53 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. RES CHIP 1608 1/10W J 56k Ω Q401 TRANSISTOR KTA-1266-GR-AT/P or NQS4KTA1266P RRXA563YF002 CHIP RES. 1/10W J 1.8k Ω or TRANSISTOR 2SA1015-GR(TE2 F T) QQS12SA1015F R032 RRXAJR5Z0182 RES CHIP 1608 1/10W J 1.8k Ω Q402 TRANSISTOR KTC3203-Y-AT/P or NQSYKTC3203P...
  • Page 54 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CHIP RES. 1/10W J 75 Ω or RES CHIP 1608 1/10W J 0 Ω R322 RRXAJR5Z0750 RRXA000YF002 RES CHIP 1608 1/10W J 75 Ω CHIP RES. 1/10W J 12k Ω or RRXA750YF002 R421 RRXAJR5Z0123...
  • Page 55 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CHIP RES. 1/10W J 33 Ω or CARBON RES. 1/6W G 10k Ω or R477 RRXAJR5Z0330 R535 RCX6GATZ0103 RES CHIP 1608 1/10W J 33 Ω CARBON RES. 1/4W G 10k Ω RRXA330YF002 RCX4GATZ0103 CHIP RES.
  • Page 56 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CARBON RES. 1/6W J 1k Ω or R703 RCX6JATZ0102 JK757 RCA JACK MSP-281V40-B(B110) JXRL010LY138 CARBON RES. 1/4W J 1k Ω RCX4JATZ0102 JK758 RCA JACK 1P MSP-281V31-A(B110) JYRL010LY027 CHIP RES. 1/10W J 1k Ω or R706 RRXAJR5Z0102 JW001...
  • Page 57 SENSOR CBA Ref. No. Mark Description Part No. C116 ELECTROLYTIC CAP . 470µF/6.3V M or CE0KMASDL471 Ref. No. Mark Description Part No. ELECTROLYTIC CAP . 470µF/6.3V M CE0KMASTM471 SENSOR CBA 0VSA14893 C117 ELECTROLYTIC CAP . 470µF/6.3V M or CE0KMASDL471 Consists of the following: ELECTROLYTIC CAP .
  • Page 58 Ref. No. Mark Description Part No. IC AUDIO PROCESSOR MSP3417G- NSZBA0SP3005 QG-B8-V3 COILS INDUCTOR 10µH-K-26T LLAXKATTU100 PCB JUMPER D0.6-P5.0 JW5.0T INDUCTOR 18µH-K-26T LLAXKATTU180 INDUCTOR 10µH-K-26T LLAXKATTU100 RESISTORS CHIP RES. 1/10W J 1k Ω or RRXAJR5Z0102 RES CHIP 1608 1/10W J 1.0k Ω RRXA102YF002 CHIP RES.(1608) 1/10W 0 Ω...
  • Page 59 31C-850/31D-864 HM453FD/455ED 2006-05-23...

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