Aiwa HV-FX780 Service Manual
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Aiwa HV-FX780 Service Manual

Aiwa HV-FX780 Service Manual

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HV-FX780
NH
SERVICE MANUAL
BASIC TAPE MECHANISM : D-33 (6721R-0122A)
VIDEO CASSETTE RECORDER
This Service Manual is the "Revision Publishing" and replaces "Simple Manual"
(S/M Code No.09-999-335-6T1).
S/M Code No. 09-999-335-6R1

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  • Page 1 HV-FX780 SERVICE MANUAL BASIC TAPE MECHANISM : D-33 (6721R-0122A) VIDEO CASSETTE RECORDER This Service Manual is the “Revision Publishing” and replaces “Simple Manual” (S/M Code No.09-999-335-6T1). S/M Code No. 09-999-335-6R1...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SPECIFICATIONS ............3 16. Base Assembly P4 ............ 54 ACCESSORIES LIST ............3 17. Opener Lid ..............54 DISASSEMBLY INSTRUCTIONS ........4 18. Arm Assembly T/up ........... 54 SERVICE POSITION ............5 19. Arm Assembly Pinch ..........54 VCR TEST TAPE INTERCHANGEABILITY TABLE ..

  • Page 3: Specifications

    SPECIFICATIONS Video recording system RF output VHF channel 3 or 4 (switchable), 66 dBµ Rotary 2 head helical scanning system Video input 1.0 Vp-p, 75 ohm, unbalanced Video head Double azimuth 4 head Video output 1.0 Vp-p, 75 ohm, unbalanced Tuner system Frequency synthesized tuner Horizontal resolution...

  • Page 4: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 1. Top Case Removal 4. Mechanism Removal (see Fig. 3) 1) Remove 4 screws holding the top case. 1) Disconnect the drum FF cable from the connector (PMD01) on the Main C.B. 2. Panel Front Removal (see Fig. 1) 2) Disconnect the ACE head FF cable from the connector 1) Release 7 tabs, and then remove the panel front.

  • Page 5: Service Position

    SERVICE POSITION To set the mechanism to the service position in active status: Insert a spacer as shown below: The service position can be set in the stable status without any defective contact. MAIN C.B MECHA SPACER 60mm MAIN C.B Use a spacer with a diameter of 10-15 mm, and of any shape (round, square, etc.).

  • Page 6: Vcr Test Tape Interchangeability Table

    VCR TEST TAPE INTERCHANGEABILITY TABLE There are two types of the new allgnment tape CH-1B (for NTSC) and CH-2 (for PAL). On each tape four signals (1)-(4) are recorded for the times and in the order shown below. (1) : 8min. → (2) : 2min. → (3) : 5min. → (4) : 5min. The TTV-MP1 (for M-PAL), TTV-MS1 (for MESECAM) and TTV-S1 (for SECAM) allgnment tapes have the same contents as the previous tapes.

  • Page 7: Electrical Main Parts List

    ELECTRICAL MAIN PARTS LIST REF. NO PART NO. KANRI DESCRIPTION REF. NO PART NO. KANRI DESCRIPTION C328 87-015-681-080 CAP,E 10-16V C330 87-010-402-040 CAP,E 2.2-50V S6-570-62A-000 IC,PC817 C331 87-015-695-080 CAP,E 1.0-50V SI-SS4-310-00A IC,KA431AZ C332 87-010-544-010 CAP,E 0.1-50V SI-KE4-310-00A IC,KIA431 3P C335 87-016-088-040 CAP,E 220-6.3V SI-HI1-187-17A...

  • Page 8: Transistor Illustration

    REF. NO PART NO. KANRI DESCRIPTION REF. NO PART NO. KANRI DESCRIPTION L501 87-005-208-080 COIL,100 X5F1 S6-180-10B-000 X’TAL,4MHZ L506 87-005-682-080 COIL,6.80UH ZD101 S9-7U0-3R3-1B0 ZENER,MTZ3.3B L701 87-005-693-080 COIL,56M K 6-6-5 ZD151 SD-Z13-000-9AC ZENER,MTZ13B LD501 S9-31R-001-7A0 ZD152 87-070-334-070 ZENER,MTZ10B MS501 S6-00R-PY0-01B SW,MMS00420ZMBO MIC ZD501 SM-TZ6-8CT-000 ZENER,MTZ6.8C...

  • Page 9: Wire Harness Diagram

    WIRE HARNESS DIAGRAM PMD01 D.CTL M.GND LOWER DRUM 5.3V PMC01 PKM02 PMK02 MOTOR GND I-LIMIT CAPSTAN CAP CTL 12.3V MOTOR FRONT-1 C.B CAP REV "H" 5.3V K.RTN1 P3D02 CTL(+) CTL(-) A/E(-) MAIN C.B A/E(+) HEAD A.REC A.PB PKM01 PMK01 MS501 OTPB "H"...

  • Page 10: Block Diagram

    BLOCK DIAGRAM-1 (POWER SECTION)
  • Page 11 BLOCK DIAGRAM-2 (AUDIO SECTION)

  • Page 12: Tuner Section

    BLOCK DIAGRAM-3 (TUNER SECTION)
  • Page 13 BLOCK DIAGRAM-4 (VIDEO SECTION) From • PB MODE SYSCON/SERVO SECTION X301 3.579MHz V.H/SW30 To/From C-CCD SYSCON/SERVO X-tal Serial Cont SECTION V.ENV VCO/OSC interface CLOCK Drive REC-AMP SP PB CH2 SP CH2 Y-CCD REC-AMP SP PB CH1 V. OUT SP CH1 APC/ACC Main CCD LPF...

  • Page 14: Front 1 C.b

    BLOCK DIAGRAM-5 (SYSTEM CONTROL SECTION) DIG5F1 DISPLAY AUDIO/VIDEO SECTION TO DECK Q506 C. sync 5.3VA MODE S/W D502 MS501 31 32 38 40 61 80 81 12 24 I-Limit MODE S1 MODE S1 FD (+) MODE S2 MODE S2 MODE S3 Q509 FD (-) MODE S4...
  • Page 15 SCHEMATIC DIAGRAM-1 (POWER SECTION) MAIN (POWER SECTION) C.B 12.3V(CAP) 15.0 12.1 12.7 12.1 ICP-N20 C101 0.1u/275V ICP-N20 (0.8A/50V) 35.5 35.6 IC102 PC817 34.9 AC120V IC103 60Hz KA431AZ (KIA431) NOTES) Warning ONE VOLTAGE:PB OR REC MODE NOTES) Symbol denotes AC ground. NOTES) Parts that are shaded are critical : HOTCIRCUIT...
  • Page 16 SCHEMATIC DIAGRAM-2 (AUDIO/VIDEO SECTION) MAIN (AUDIO/VIDEO SECTION) C.B (2/6) 5.1V(D) (1/6) 5.1V(A) X301 3.5796MHz (1/4) VIDEO (2.7) TU VIDEO LINE VIDEO -(0) 2.1(2.3) 2.1(2.3) VIDEO 2.1(2.3) To/From CYL. (2.3) HEADS (3/6) 2.1(2.3) 2.1(2.3) AUDIO 2.1(2.3) EMPH 2.1(2.3) (5/6) (1.4) (4/6) 809 MOD.A.IN SQPB IN (2.1)

  • Page 17: Waveform 1. Video Section

    WAVEFORM-1 (VIDEO SECTION) IC301 Pin $ IC301 Pin ^ IC301 Pin *, ¡, £ IC301 Pin ⁄ 100mV/10µsec DIV 100mV/10µsec DIV 100mV/10µsec DIV 200mV/10µsec DIV VV/EE VV/EE (Main De-Emphasis Clamp Drive In Pin * (Main De-Emphasis out) (VIDEO IN) Peaking) Y-out (to 1H CCD) Pin ¡...

  • Page 18: Servo/Osd Section

    WAVEFORM-2 (SERVO/OSD SECTION) IC501 Pin ⁄ IC501Pin ¤ IC501 Pin ≤ IC501 Pin ≥ 1V/10msec DIV 1V/10msec DIV 1V/5msec DIV 1V/2msec DIV REC/PB QUE/REV (CTL+) (CTL–) (V.H/SW) (D.V-SYNC) IC501 Pin , IC501 Pin ° IC501 Pin · IC501 Pin ‚ 100mV/10µsec DIV 1V/1msec DIV 1V/10µsec DIV...
  • Page 19 SCHEMATIC DIAGRAM-3 (SYSTEM CONTROL/SERVO/OSD SECTION) MAIN (SYSCON/SERVO SECTION) C.B IC502 KA3082 LOADING MOTOR DRIVE 12.2 12.2 0.9 (0.5) (0.5) (2/3) 14(3/3) K.RTN1 LOADING MOTOR From FRONT-1 C.B PKM02 DISPLAY (6/13) To/From AUDIO/VIDEO SECTION (3/13) 13(3/3) K.RTN0 To/From FRONT-2 C.B PMK01 To/From (5/5) LOWER...

  • Page 20: Fl Display

    SCHEMATIC DIAGRAM-4 (TUNER SECTION) FL DISPLAY • GRID ASSIGNMENT • ANODE CONNECTION...
  • Page 21 WIRING-1 (MAIN C.B SECTION) To CAPSTAN To LOADING CYL. LOWER MOTOR MOTOR HEADS DRUM SW701 ACE HEADS AUDIO VIDEO VHF/UHF MAIN C.B PMC01 PML01 P3D02 P3D01 PMD01 IN FORM ANT OUT TO TV JK301 IC502 Q301 R326 AC120V SW701 C530 TU701 60Hz C331...

  • Page 22: Main C.b Section

    WIRING-2 (FRONT-1 C.B SECTION) SCHEMATIC DIAGRAM-5 (FRONT-1 SECTION) FRONT-1 C.B FRONT-1 C.B SW5A1 PKM02 SW5A6 P/STILL SW5A2 SW5A4 R5A3 R5A1 R5A2 R5A4 R5A5 2.2K 1.8K 1.5K 2.7K 3.9K K.RTN 1 SW5A3 SW5A1 SW5A2 SW5A3 SW5A6 SW5A4 SW5A5 PLAY PLAY /F FWD REC/ITR REW/ STOP...

  • Page 23: Ic Description

    IC DESCRIPTION IC, HD3977RC36F Pin No. Pin Name Description End sensor to detect the tape’s terminal (Lead taps section). TAKE UP If “H” is detected signal in the REW, REV modes, the mechanism stops and ejects the SENSOR cassette automatically. VSS (A/D) –...
  • Page 24 Pin No. Pin Name Description KEY NAME A/D RANGE SP/EP 0.0V ~ 0.45V CH UP 0.46V ~ 0.96V CH DOWN 0.97V ~ 1.47V STOP/EJECT 1.48V ~ 1.97V REC/ITR 1.99V ~ 2.48V KEY RTN1 KEY NAME A/D RANGE PAUSE 0.0V ~ 0.45V KEY RTN 1 0.46V ~ 0.96V 0.97V ~ 1.47V...
  • Page 25 Pin No. Pin Name Description Output for the audio head switching 30Hz to the Hi-Fi circuits is made by inputting A.H.S/W 30 DPG, DFG signal through pin 38, 39 for switching Hi-Fi head. Refer to pin 24. Pulses output for switching video head A and B. - Produces PG M.M pulses internally by using inputted DPG, DFG pulses to pin 38, V.H.S/W 30 - Produces video head switching 30 Hz pulses by sychronizing at edge point of first...
  • Page 26 Pin No. Pin Name Description Vref (OSD) – GND. CV OUT The video signal is output to the RF modulator and line output jack. CHAR BIAS – GND. AFC LPF Horizontal sync is used to lock the OSD. (Reduce Jitter) AFC OSC Vss (OSD) –...
  • Page 27 Pin No. Pin Name Description OSC 1 1. 10MHz oscillator is used to generate the standard clock used to operate the u-COM. 2. When Vcc is applied, Oscillation occurs. (But, when “L” is applied to pin 89 in OSC 2 power failure, Oscillation stops.) 1.
  • Page 28 Pin No. Pin Name Description 1. This pin receives remocon data through RC5F1, which amplifies and detects the R/C signal. 2. After input signal is decoded in µ-COM (IC501), and performs related key operation. For LED clock model. COMPOSITE 1. Input C-Sync (composite sync) to confirm whether video signal is present or not. SYNC.

  • Page 29: Ic Block Diagram

    IC BLOCK DIAGRAM IC, HD3977RC36F <OSD Section> COLOR BURST 4 fsc in 4/2 fsc BLUE VIDEO BLUE SIGNAL/ GENERATOR SIGNAL COLOR PHASE 4 fsc out LUMINANCE GEN. SYNC.SIGNAL GENERATOR BLUE BACK SUPERIMPOSE C.Vin SYNC.TIP Vref CLAMP Vchar CHARACTER LUMINANCE CONTROL C.Vout CHAR bias OUTLINE LUMINANCE CONTROL...

  • Page 30: Adjustment

    ADJUSTMENT Test Equipment • Oscilloscope • Test Tape • AC Millivolt Meter TTV-P1 Adjustment Location MAIN C.B (TOP VIEW) H/SW IC502 TU701 P3D01 P3D02 T101 IC301 PMC01 MS501 IC501 VR501 PG ADJ. IC5F1 PMK02...
  • Page 31 1. Servo Adjustment 1) PG Adjustment MODE MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION PLAY VIDEO OUT VR501 6.5 ± 0.5H (TTV-P1) H/SW (W321, W322) • Adjustment Procedure 1. Insert the PAL SP Test Tape (TTV-P1) and play. Note - Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the “ATR” is blink after the PAL SP Test Tape is inserted.

  • Page 32: Mechanical Exploded View 1/1

    MECHANICAL EXPLODED VIEW 1/1...

  • Page 33: Mechanical Main Parts List 1/1

    MECHANICAL MAIN PARTS LIST 1/1 REF. NO PART NO. KANRI DESCRIPTION 1 S7-21R-F09-4H0 PANEL ASSY FRONT 2 S7-20R-F07-2G0 PANRL,FRONT 3 S4-426-81A-000 SPR,DOOR 4 S5-80R-003-3J0 DOOR,CST ——— COVER BOTTOM ——— DECK ASSY D33 ——— FRAME MAIN 8 S1-10R-012-8E0 CASE TOP BACK 9 S4-10R-GHC-01A CORD POWER 10 S7-21R-D01-8F0...

  • Page 34: Mechanism Exploded View 1/3, 2/3, 3/3

    MECHANISM EXPLODED VIEW 1/3...

  • Page 35: Mechanism Main Parts List 1/3, 2/3, 3/3

    MECHANISM MAIN PARTS LIST 1/3 REF. NO PART NO. KANRI DESCRIPTION REF. NO PART NO. KANRI DESCRIPTION ——— SUB DRUM ASSY D33-4CH 022 S5-238-33B-000 HEAD FE D33 002 S6-80R-B00-04A MOTOR(MECH) 022 S5-238-33C-000 FE HEAD 002 S6-80R-B00-05A MOTOR(MECH) DRUM GVD-033A 023 S9-80R-001-0A0 SUPPORTER CST 003 S9-30R-010-7A0 HOLDER FPC...
  • Page 36 MECHANISM EXPLODED VIEW 2/3...
  • Page 37 MECHANISM MAIN PARTS LIST 2/3 REF. NO PART NO. KANRI DESCRIPTION 032 S1-41R-000-2A0 CHASSIS ASSY 051 S4-00R-000-5A0 BELT CAPSTAN 052 S6-80R-000-2A0 MOTOR(MECH) 052 S6-80R-A00-03A MOTOR(MECH) 053 S9-74R-001-8A0 GUIDE RACK F/L 054 S4-70R-003-7A0 GEAR RACK F/L 055 S4-70R-003-3A0 GEAR DRIVE 056 S4-70R-003-2A0 GEAR CAM 057 S4-70R-003-6B0 GEAR CONNECT...
  • Page 38 MECHANISM EXPLODED VIEW 3/3...
  • Page 39 MECHANISM MAIN PARTS LIST 3/3 REF. NO PART NO. KANRI DESCRIPTION 032 S1-41R-000-2A0 CHASSIS ASSY 100 S3-01R-002-9A0 PLATE ASSY TOP 101 S8-10R-005-6A0 BRACKET SIDE(L) ——— LEVER STOPPER(L) ——— HOLDER SIDE(L) 104 S9-74R-001-9A0 GUIDE CST ——— HOLDER CST ——— HOLDER SIDEE(R) ———...

  • Page 40: Deck Mechanism Parts Locations

    DECK MECHANISM PARTS LOCATIONS • Top View Pracedure Fig- Part Fixing Type Starting Drum Assembly 3 Screws , Cap FPC A-1 Plate Assembly Top Two Hooks Bracket Side 'L' 5 Holder Assembly CST Chassis Hole 6 Bracket Assembly Door Guide CST 2 Hooks Plate Assembly 2 2,3,4...

  • Page 41: Deck Mechanism Disassembly

    DECK MECHANISM DISASSEMBLY (S2) Stator (S2) (S3) Drum Motor (S3) Rotor Drum Sub Assembly (Fig. A-1-1) Drum FPC (S1) (S1) Optional Parts Holder FPC Holder FPC Holder FPC (only for 2HD Models) (only for 4HD-Mono Models) (only for 4HD-Hi-Fi Models) Cap FPC (Fig.

  • Page 42: Plate Assembly Top

    DECK MECHANISM DISASSEMBLY Plate Assembly Top (Fig. A-2-1) Holder Assembly CST Lever Stopper (L) Lever Stopper (R) (Fig. A-2-2) Arm Assembly F/L Arm F/L (Fig. A-2-6) (S2) Lever Assembly S/W (Fig. A-2-7) (H5) Bracket Side (L) (S1) (Fig. A-2-4) Groove Gear Rack F/L Groove (Fig.
  • Page 43 DECK MECHANISM DISASSEMBLY 2. Plate Assembly Top (Fig. A-2-1) 2) Remove the Screw (S2) and disassemble the Bracket Assembly Door in the front. 1) Unhook the (H1) and separate the Left Side. 6. Arm Assembly F/L (Fig. A-2-6) 2) Unhook the (H2) and lift up the Plate Assembly Top. 1) Push the Arm Assembly F/L to the left and lift up it.

  • Page 44: Arm Assembly Cleaner

    DECK MECHANISM DISASSEMBLY Arm Assembly Cleaner (Fig. A-3-1) (S1) Base Assembly A/C Head (Fig. A-3-3) (Fig. A-3-2) (H1) Head F/E Fig. A-3 8. Arm Assembly Cleaner(Fig. A-3-1) 9. Head F/E (Fig. A-3-2) 1) Break away the (A) part shown above Fig. A-3-1 from the 1) Unhook the two Hooks (H1) on the back side of the Embossing of the Chassis in the clockwise direction and Chassis and lift up the Head F/E.

  • Page 45: Brake Assembly S

    DECK MECHANISM DISASSEMBLY Spring S Brake Brake Assembly S (Fig. A-4-1) Arm Assembly Tension Reel T Spring Tension (Fig. A-4-5) Band (Fig. A-4-3) Assembly Spring T Brake Tension Reel S Brake Assembly T (Fig. A-4-2) (Fig. A-4-4) Fig. A-4 11. Brake Assembly S (Fig. A-4-1) 13.

  • Page 46: Support Cst

    DECK MECHANISM DISASSEMBLY Opener Lid (Fig. A-5-3) Spring Arm T/Up Arm Assembly T/up (Fig. A-5-4) Assembly Pinch Base Assembly P4 (Fig. A-5-5) Support CST (Fig. A-5-1) (Fig. A-5-2) Fig. A-5 15. Support CST (Fig. A-5-1) 2) Lift up the Arm Assembly T/up. 1) Break away the (A) part shown above Fig.

  • Page 47: Belt Capstan/Motor Capstan

    DECK MECHANISM DISASSEMBLY Belt Capstan (Fig. A-6-1) Motor Capstan Washer(W1) Clutch Assembly D33 (Fig. A-6-3) (Fig. A-6-2) Washer(W2) Optional Parts Gear Assembly H-Up/D or Gear Assembly Up/D Lever F/R (For Hi-Rewind Models) (For Normal Models) (Fig. A-6-4) Hook(H1) Spring Up/D Slide Washer (Fig.

  • Page 48: Bracket Assembly Jog

    DECK MECHANISM DISASSEMBLY Brake Assembly Capstan Hole (A)+(B) Brake Assembly Capstan (H2) Gear Cam Spring Capstan (Fig. A-7-4) Hole (A) Guide Rack F/L (H1) (S1) Bracket Assembly Jog (S2) (Fig. A-7-2) (Fig. A-7-1) Gear Rack F/L Gear Cam Hole (B) (Fig.

  • Page 49: Gear Drive/Gear Cam/Gear Connector

    DECK MECHANISM DISASSEMBLY Washer (W1) Gear Drive (Fig. A-8-1) Gear Cam Hole(B) (Fig. A-8-2) Gear Connector Hole(A) (Fig. A-8-3) Gear Connector Hole(A')+(A) Hole(B') Hole(A') Chassis Bracket Assembly L/D Motor Hole(B')+(B) (Fig. A-8-4) Gear Cam Fig. A-8 (Fig. B-3) 27. Gear Drive (Fig. A-8-1)/ Gear Cam (Fig.

  • Page 50: Gear Sector

    DECK MECHANISM DISASSEMBLY Washer (W1) Gear Sector (Fig. A-9-1) ( S1) Base Tension Plate Slider (Fig. A-9-2) (Fig. A-9-3) Lever Tension (Fig. A-9-4) Fig. A-9 29. Gear Sector (Fig. A-9-1) NOTE 1) Remove the Washer(W1) and lift up the Gear Sector. 30.

  • Page 51: Arm Assembly Idler Jog Or Arm Assembly Idler

    DECK MECHANISM DISASSEMBLY (Fig. A-10-1) Gear Assembly P3 Gear Assembly P3 Gear Assembly P2 (Fig. A-10-2) Gear Assembly P2 Chassis Optional Parts Base Assembly P2 Arm Assembly Idler or Arm Assembly Idler Jog (Fig. A-10-4) (For 2HD Models) (For 4HD Models) (Fig.

  • Page 52: Deck Mechanism Adjustment Tools And Fixtures For Service

    DECK MECHANISM ADJUSTMENT • Tools and Fixtures for Service 3. Torque gauge 1. Cassette Torque meter 2. Alignment tape 600g.Cm ATG SRK-VHT-303(Not SVC part) (See figure below) 4. Torque gauge adaptor 5. Post height adjusting driver 6. + Type driver (ø 5) Parts No: SV-TGO-030-000 (SMALL) SV-TGO-020-000 (LARGE)

  • Page 53: Mechanism Alignment Position Check

    DECK MECHANISM ADJUSTMENT 1.Mechanism Alignment Position Check Purpose:To determine if the Mechanism is in the correct position, when a Tape is ejected. Test Conditions (Mechanism Test Equipment/ Fixture Check Point Condition) • Mechanism and Mode Switch Position • Blank tape •...

  • Page 54: Preparation For Adjustment

    DECK MECHANISM ADJUSTMENT 2. Preparation for Adjustment (To set the Cassette without Tape. Cover the Holes of the End Sensors at the both sides of the Deck Mechanism to the Loading state Bracket Side(L) and Bracket Assembly Door to prevent a without inserting a Cassette Tape).

  • Page 55: Guide Roller Height Adjustment

    DECK MECHANISM ADJUSTMENT 4.Guide Roller Height Adjustment Purpose: To regulate the Height of the Tape so that the Bottom of the Tape runs along the Tape Guide Line on the Lower Drum. 4-1. Preliminary Adjustment Test Equipment/ Fixture Test Conditions (Mechanism Condition) Adjustment Point •...

  • Page 56: Audio/Control (A/C) Head Adjustment

    DECK MECHANISM ADJUSTMENT 5. Audio/Control (A/C) Head Adjustment Purpose: To insure that the Tape passes accurately over the Audio and Control Tracks in exact Alignment in both the Record and Playback Modes. 5-1. Preliminary Adjustment (Height and Tilt Adjustment) Perform the Preliminary Adjustment, when there is no Audio Output Signal with the Alignment Tape. Test Equipment/ Fixture Test Conditions (Mechanism Condition) Adjustment Point...

  • Page 57: Precise Adjustment (Azimuth Adjustment)

    DECK MECHANISM ADJUSTMENT 5-2. Confirm that the Tape passes smoothly slowly turn the Tilt Adjustment Screw(C) in the Counterclockwise direction. between the Take-up Guide and Pinch Roller(using a Mirror or the naked eye). Afetr completing Step 5-1.(Preliminary Adjustment), NOTE: check that the Tape passes around the Take-up Guide and Pinch Roller without Folding or Curling at the Top or Check the RF Envelope after adjusting the A/C Head, if Bottom.

  • Page 58: Adjustment After Replacing Drum Assembly (Video Heads)

    DECK MECHANISM ADJUSTMENT 7. Adjustment after Replacing Drum Assembly (Video Heads) Purpose: To correct for shift in the Roller Guide and X value after replacing the Drum. Test Conditions Test Equipment/ Fixture Connection Point Adjustment Points (Mechanism Condition) • CH-1: PB RF Envelope •...

  • Page 59: Maintenance/Inspection Procedure

    MAINTENANCE/INSPECTION PROCEDURE 1 Check before starting repairs The following faults can be remedied by cleaning and oiling. Check the needed lubrication and the conditions of cleanli- ness in the unit. Check with the customer to find out how often the unit is used, and then determine that the unit is ready for inspection and maintenance.

  • Page 60: Required Maintenance

    MAINTENANCE/INSPECTION PROCEDURE 4. Supplies Required for Inspection and 2. Required Maintenance Maintence The recording density of a VCR(VCP) is much higher than that of an audio tape recorder. VCR(VCP) components must (1) Grease : Kanto G-311G (Blue) or equivalent be very precise, at tolerances of 1/1000mm, to ensure com- (2) Isopropyl Alcohol or equivalent patiblity with other VCRs.

  • Page 61: Greasing

    MAINTENANCE/INSPECTION PROCEDURE (2) Periodic greasing 5-2) Greasing Grease specified locations every 5,000 hours. (1) Greasing guidelines Apply grease, with a cleaning patch. Do not use excess 1) Loading Path Inside & Top side 5) Lever Tension Groove grease. It may come into contact with the tape transport 2) Shaft 6) Clutch Assembly D33 Shaft or drive system.

  • Page 62: Mechanism Troubleshooting Guide

    MECHANISM TROUBLESHOOTING GUIDE 1.Deck Mechanism Auto REW doesn't work. Is the output of END sensor of supply side "H"? “H”: more than 3.5V “L”: less than 0.7V~1V Is the Vcc. voltage of End Check the syscon power. sensor 5V? Replace End sensor. Is the voltage across IR LED Replace LED.
  • Page 63 MECHANISM TROUBLESHOOTING GUIDE AUTO STOP. (PLAY/CUE/REV) Check aligment positions (page 61) Check spring Pinch. In Play/Cue/Rev is the pinch roller in contact with the capstan Is the output of DFG, DPG OK? Replace Drum Motor. shaft. Are there T/up and supply reel Check Servo, Syscon.
  • Page 64 MECHANISM TROUBLESHOOTING GUIDE In PB mode Tape Presence not sensed. Is the Pinch Roller attached Check Alignment positions to the Capstan Motor Shaft? (page 61) Does the T/Up Is the Belt ok? Replace the Belt. Reel turn? Check the clutch and the Idler Does the Capstan Motor turn? Assembly.

  • Page 65: Front Loading Mechanism

    MECHANISM TROUBLESHOOTING GUIDE 2. Front Loading Mechanism Cassette cannot be inserted. Is the Lever Switch Spring Replace or add the Does the Lever Switch work? damaged or omitted? Lever Switch Spring. Does the F/L switch work Replace F/L Switch. normally? Is the Vcc of Main P.C.Board 5V? Check syscon circuit.
  • Page 66 MECHANISM TROUBLESHOOTING GUIDE Cassette will not load. Does the CST insert? Does the opener Lid work? Replace the Opener Lid. Does the Gear Rack F/L work? Replace the Rear Rack F/L. Does the Opener Door work? Does the Arm Assembly F/L work? Is the opener Door assembled correctly? Does the L/D Motor work? Replace the Arm Assembly F/L.
  • Page 67 2–11, IKENOHATA 1–CHOME, TAITO-KU, TOKYO 110-8710, JAPAN TEL:03 (3827) 3111 Printed in Singapore 920074...

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