Hitachi VT-FX795A Service Manual
  1. Manuals
  2. Brands
  3. Hitachi Manuals
  4. VCR
  5. VT-FX795A
  6. Service manual
Hitachi VT-FX795A Service Manual

Hitachi VT-FX795A Service Manual

Hide thumbs Also See for VT-FX795A:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Owner's Manual
TK
No. 5301E
VT-FX795A
SERVICE MANUAL
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
VIDEO CASSETTE RECORDER
March
2003
Digital Media Division, Tokai

Advertisement

Table of Contents
loading

Related Manuals for Hitachi VT-FX795A

Summary of Contents for Hitachi VT-FX795A

  • Page 1 No. 5301E VT-FX795A SERVICE MANUAL SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT VIDEO CASSETTE RECORDER March 2003 Digital Media Division, Tokai...

  • Page 2: Table Of Contents

    CONTENTS 1 SAFETY PRECAUTION FOR REPAIR 6 EXPLODEDS VIEWS AND PARTS LIST ..6-1 REPAIR ....... .1-1 6-1 EXPLODED VIEWS .

  • Page 3: Safety Precaution For Repair

    SAFETY PRECAUTION FOR REPAIR 1-1 IMPORTANT SAFETY PRECAUTIONS 1-1-1 Product Safety Notice H. When a power cord has been replaced, check that 5 - 6 kg of force in any direction will not loosen it. Some electrical and mechanical parts have special I.

  • Page 4: Safety Check After Servicing

    1-1-3 Safety Check after Servicing Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts, Chassis or Secondary Conductor and wires have been returned to their original posi- tions. Afterwards, do the following tests and confirm the specified values to verify compliance with safety Primary Circuit Terminals standards.

  • Page 5: Standard Notes For Servicing

    1-2 STANDARD NOTES FOR SERVICING 1-2-1 Circuit Board Indications 1-2-3 How to Remove / Install Flat Pack-IC a. The output pin of the 3 pin Regulator ICs is indi- cated as shown. 1. Removal With Hot-Air Flat Pack-IC Desoldering Machine:. Top View Bottom View (1) Prepare the hot-air flat pack-IC desoldering...
  • Page 6 With Soldering Iron: (4) Bottom of the flat pack-IC is fixed with glue to the CBA; when removing entire flat pack-IC, first apply (1) Using desoldering braid, remove the solder from all soldering iron to center of the flat pack-IC and heat pins of the flat pack-IC.

  • Page 7: Instructions For Handling Semi-Conductors

    2. Installation 1-2-4 Instructions for Handling Semi-conductors (1) Using desoldering braid, remove the solder from the foil of each pin of the flat pack-IC on the CBA Electrostatic breakdown of the semi-conductors may so you can install a replacement flat pack-IC more occur due to a potential difference caused by electro- easily.

  • Page 8: General Description

    GENERAL DESCRIPTION 2-1 SPECIFICATIONS Format: Video Signal System: NTSC color EIA standard Record/Playback System:Video: 4 heads Audio: VHS Hi-Fi stereo record/playback system Tape Speed: 33.35mm/s(SP), 16.67mm/s (LP) (Playback Only), 11.12mm/s (SLP) RF Input: UHF/VHF 75 ohm Tuner: 181 channel tuning ability *(125 cable channel) Type: Auto programming frequency synthesis Power Input:...

  • Page 9: Comparison Of Models

    2-2 COMPARISON OF MODELS 2-2-1 Comparison of Features ITEM VT-FX795A VT-FX695A/FX695AC Cabinet Size 360(W) x 92(H) x 216(D) mm 435(W) x 92(H) x 216(D) mm Weight 1.8 kg 2.5 kg Power Consumption 14 W 14 W Video Format Y/C Separation...

  • Page 10: Comparison Of Main Control Ics

    2-2-2 Comparison of Main Control ICs ITEM OPERATION VT-FX795A VT-FX695A/FX695AC Video Video Signal Process LA71091M(IC301) LA71091M(IC301) FM Audio Signal Process LA72670M(IC451) LA72655M(IC451) Audio Linear Audio Signal Process Included in IC301 Included in IC301 Main Microcomputer µP MN101D08EFA4(IC501) M37765MAA1N1GP(IC501) VCR-EEP ROM...

  • Page 11: Function Indicator Symbols

    2-3 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 LED MODE INDICATOR ACTIVE...

  • Page 12: Operating Controls And Functions

    2-4 OPERATING CONTROLS AND FUNCTIONS Front Panel Remote Control 1. EJECT button 2. NUMBER buttons 3. MENU button POWER EJECT VCR /TV 4. RECORD button POWER CHANNEL REC/IRT STOP/EJECT PLAY F.FWD 5. SPEED button 6. REW button VIDEO IN L-AUDIO IN-R CHANNEL 7.

  • Page 13: Troubleshooting

    TROUBLESHOOTING 3-1 TROUBLESHOOTING Video problem 1 (No recording Video) RF INPUT LINE INPUT Check Video signal at pin Check TU701. Check Video signal at pin Check A/V cable. 42 of IC301. 38(or pin40) of IC301. Check signal at pin 89(or pin90) or pin84(or pin83) of IC301. Cleaning Video the Head.
  • Page 14 Audio problem 1 (No recording Normal Audio) RF INPUT LINE INPUT Check SIF signal at pin Check TU701. Check Video signal at pin Check A/V cable. 57 of IC451. 69(or pin71) or pin 7 (or pin9)of IC451. Check Audio signal at pin 6 of IC451. Check IC451.
  • Page 15 Audio problem 3 (No recording Hi-Fi Audio) RF INPUT LINE INPUT Check SIF signal at pin Check TU701. Check Video signal at pin Check A/V cable. 57 of IC451. 69(or pin71) or pin 7 (or pin9) of IC451. Check signal at pin 26 of IC451. Check IC451.
  • Page 16 1] Check for any defective parts while the secondary Power problem rectifying diodes are disconnected. Perform a diode check in both forward and reverse directions through a tester. It is highly recommended that a variable isolation transformer which can monitor current be used. 2] Remove the following components and check for (Alternatively a variable AC source which moni- defects: snubber diode (D051), switching FET (Q001),...

  • Page 17: Standard Maintenance

    3-2 STANDARD MAINTENANCE 3-2-1 Service Schedule of Components h: Hours : Check I: Change Deck Periodic Service Schedule Ref.No. Part Name 1,000 h 2,000 h 3,000 h 4,000 h Cylinder Assembly Loading Motor Assembly Pulley Assembly B587 Tension Lever Assembly ACE Head Assembly B573,B574 Reel (SP)(D2), Reel (TU)(D2)

  • Page 18: Cleaning

    3-2-2 Cleaning Cleaning of Audio Control Erase Head Clean the head with a cotton swab. Cleaning of Video Head Procedure Clean the head with a head cleaning stick or chamois 1.Remove the top cabinet. cloth. 2.Dip the cotton swab in 90% Isopropyl alcohol and Procedure clean the audio control erase head.

  • Page 19: Adjustment

    ADJUSTMENT 4-1 PREPARATION FOR SERVICING 4-1-1 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.

  • Page 20: Fixture And Tape For Adjustment

    4-2 FIXTURE AND TAPE FOR ADJUSTMENT 1. Alignment Tape 2. Guide Roller Adj. Screwdriver No. 7099046 (MH-1) No. 7099028 3. Flat Screwdriver (Purchase Locally) 4-2-1 How To Use The Fixtures And Tape Item No. Name Part No. Adjustment I Head Switching Point Alignment Tape 7099046 I Tape Interchangeability Alignment...

  • Page 21: Electrical Adjustment Instructions

    4-3 ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: "CBA" is an abbreviation for "Circuit Board Assembly." NOTE: Figure 1 1.Electrical adjustments are required after replacing circuit components and certain mechanical parts. It is important to do these adjustments only after EXT. Syncronize Trigger Point all repairs and replacements have been com- pleted.

  • Page 22: Mechanical Alignment Procedures

    4-4 MECHANICAL ALIGNMENT PROCEDURES Explanation of alignment for the tape to correctly run B. Method to place the Cassette Holder in the tape- starts on the next page. Refer to the information below loaded position without a cassette tape on this page if a tape gets stuck, for example, in the 1.

  • Page 23: Tape Interchangeability Alignment

    4-4-2 Tape Interchangeability Alignment Note: To do these alignment procedures, make sure that the Tracking Control Circuit is set to the center position every time a tape is loaded or unloaded. (Refer to page 4-7, procedure 1-C, step 2.) Equipment required: Dual Trace Oscilloscope VHS Alignment Tape (MH-1) Guide Roller Adj.

  • Page 24: 1-A. Preliminary/Final Checking And Alignment Of Tape Path

    1-A. Preliminary/Final Checking and 3. Check to see that the tape runs without creasing at Alignment of Tape Path Take-up Guide Post [4] or without snaking between Guide Roller [3] and ACE Head. (Fig. M3 and M5) Purpose: 4. If creasing or snaking is apparent, adjust the Tilt To make sure that the tape path is well stabilized.

  • Page 25: 1-C. Checking/Adjustment Of Envelope Waveform

    6. Press CH DOWN button on the unit until the CTL Dropping envelope level at the end of track. waveform has shifted from its original position (not the position achieved in step 5, but the position of CTL waveform in step 4) by approximately -2ms. Make sure that the envelope is simply attenuated (shrinks in height) once CTL waveform passes its original position and is further brought in the minus...

  • Page 26: Disassembly And Reassembly

    DISASSEMBLY AND REASSEMBLY 5-1 CABINET DISASSEMBLY INSTRUCTIONS 5-1-1. 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 27 (S-3) (L-2) (L-2) (S-3) [4]Cylinder Shield Cylinder FE Head Assembly ACE Head Assembly [2] Front Assembly (L-1) [5] Deck Fig. D2 Assembly (S-2) (S-4) (S-2) [6] Main CBA (S-4) (S-4) [3]VCR Chassis Unit From Capstan From From From Motor Cylinder ACE Head FE Head Assembly...
  • Page 28 SW512 LD-SW [6] Main CBA [5] Deck Assembly Cam Gear Hole Shaft Hole LD-SW [6] Main CBA Fig. D5...

  • Page 29: Disassembly/Assembly Procedures Of Deck Mechanism

    5-2 DISASSEMBLY/ASSEMBLY PROCEDURES OF DECK MECHANISM Before following the procedures described below, be sure to remove the deck assembly from the cabinet. (Refer to CABINET DISASSEMBLY INSTRUCTIONS on page 5-1.) All the following procedures, including those for adjustment and replacement of parts, should be done in Eject mode;...
  • Page 30 REMOVAL INSTALLATION STEP START- REMOVE/*UNHOOK/ /LOC. PART ADJUSTMENT Fig. No. UNLOCK/RELEASE/ CONDITION UNPLUG/DESOLDER Loading Arm (TU) (+)Refer to Alignment [32] [33] DM2,DM14 Assembly Sec.Page 5-12 [34] [2],[25] M Brake (TU) Assembly DM1,DM15 *(P-7), Brake Belt [35] [2],[25] M Brake (SP) Assembly DM1,DM15 *(P-8) [36] [35]...

  • Page 31: Top View

    Top View [41] [42] [46] [43] [14] [13] [11] [15] [36] [10] [12] [35] [34] [40] [29] [30] [16] [39] [38] Fig. DM1 Bottom View [20] [33] [32] [24] [26] [27] [25] [23] [28] [22] [21] [31] Fig. DM2...
  • Page 32 (S-1) (S-1) (L-1) (L-3) (L-2) (P-1) Fig. DM5 [46] Fig. DM3 [47] Pin D (L-14) Pin C Pull up Slide Pin A Pin B Slot A (S-2) Slots B Slot A First, while pushing the locking tab as shown at right, slide and pull up the right side on [2] to release Pin A and Pin B from the slots A.
  • Page 33 (S-4) (S-5) [14] (S-6) [16] [15] Desolder from bottom (S-3) Lead with White Stripe Belt View for A Fig. DM7 Fig. DM9 Adj. Screw [11] [18] (L-4) (L-5) (P-3) [17] [13] [19] [12] (P-4) [10] (P-2) (S-7) Pin of [12] Pin of [10] Fig.
  • Page 34 [22] (C-4) (S-8) (C-1) [23] (L-6) [21] (P-5) [20] Cap Belt (P-5) [28] Fig. DM11 When installing [23], install the spring (P-5) to [28] as shown in the left figure, and then install [23] while Pin on pressing the spring (P-5) to bottom the direction of the arrow in of [23]...
  • Page 35 (P-6) [25] [31] Refer to the Alignment (C-3) Section, Page 5-12. (S-9) [29] [33] [30] (L-11) [32] (L-10) (L-8) (C-2) [27] [28] [24] [26] (L-9) Fig. DM14 [36] Position of Mode Lever when installed Break belt Pin of [35] (P-7) Pin of [31] Pin of [34] [34]...
  • Page 36 [42] [41] [43] (L-13) Fig. DM16 [44] [45] Slide Fig. DM17 5-11...

  • Page 37: Alignment Procedures Of Mechanism

    5-3 ALIGNMENT PROCEDURES OF MECHANISM The following procedures describe how to align the Alignment 1 individual gears and levers that make up the tape Loading Arm (SP) and (TU) Assembly loading/unloading mechanism. Since information about the state of the mechanism is provided to the Install Loading Arm (SP) and (TU) Assembly so System Control Circuit only through the Mode Switch, that their triangle marks point to each other as...

  • Page 38: Explodeds Views And Parts List

    EXPLODED VIEWS AND PARTS LIST 6-1 EXPLODED VIEWS 6-1-1 Cabinet Section 2L011 2L011 2L023 2L011 2L023 2L021 2L021 2L021 2L021 SENSOR CBA [COMPONENT 2L021 REPLACEMENT] 2B34 2L051 F001 MAIN CBA [COMPONENT REPLACEMENT] SENSOR CBA 2L031 [COMPONENT REPLACEMENT] 2L099 AC001...

  • Page 39: Deck Mechanism View 1 Section

    6-1-2 Deck Mechanism View 1 Section Mark Description Floil G-684G or Multemp MH-D (Blue grease) SLIDUS OIL #150 B494 L1467 L1191 B553 B411 B567 L1053 B410 L1051 Chassis Assembly Top View (Lubricating Point) B501 B560 L1450 L1450 B426 L1466 B121 B126 B492 B571...

  • Page 40: Deck Mechanism View 2 Section

    6-1-3 Deck Mechanism View 2 Section Mark Description Floil G-684G or Multemp MH-D (Blue grease) B521 B587 SLIDUS OIL #150 B416 B487 B591 SANKOUL FG84M (Yellow grease) B520 B590 B522 B499 B148 L1406 B508 B573 B574 B592 B558 B564 B557 B414 B565 L1151...

  • Page 41: Deck Mechanism View 3 Section

    6-1-4 Deck Mechanism View 3 Section Mark Description L1321 Floil G-684G or Multemp MH-D (Blue grease) B347 SLIDUS OIL #150 L1321 B355 B354 B483 B425 B482 B562 B300 B563 B313 B529 B360 B359 B361 B555 B514 B303...

  • Page 42: Replacement Parts List

    6-2 REPLACEMENT PARTS LIST 6-2-1 Mechanical Parts List SYMBOL-NO P-NO DESCRIPTION SYMBOL-NO P-NO DESCRIPTION B483 TJ16909 LOCK LEVER MECHANISM SECTION B487 TJ16911 BAND BRAKE TS18461 FRONT ASSEMBLY B488 TJ16912 MODE LEVER TJ16961 CASE, TOP B491 TJ16913 CAM GEAR TJ16964 JACK BOARD(HIFI) B492 TJ16914 MODE GEAR...
  • Page 43 SYMBOL-NO P-NO DESCRIPTION SYMBOL-NO P-NO DESCRIPTION ACCESSORIES TJ16963 REMOTE CONTROL UNIT TE15081 RF CABLE...

  • Page 44: Electrical Parts List

    Note: Although some parts in the schematic diagrams have different names from those in 6-2-2 Electrical Parts List the parts list, there is no problem in replacing parts. SYMBOL-NO P-NO DESCRIPTION SYMBOL-NO P-NO DESCRIPTION Q503 TJ15141 PHOTO TRANSISTOR PT204-6B-12 RESISTOR Q504 TJ15141 PHOTO TRANSISTOR PT204-6B-12...

  • Page 45: Schematic, Circuit Board And Block Diagrams

    SCHEMATIC, CIRCUIT BOARD AND BLOCK DIAGRAMS 1 SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS Standard Notes Notes: 1. Do not use the part number shown on these draw- WARNING ings for ordering. The correct part number is shown Many electrical and mechanical parts in this chassis in the parts list, and may be slightly different or have special characteristics.
  • Page 46 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. ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQES D'INCELE N'UTILISER QUE DES FUSIBLE DE MEMO TYPE.
  • Page 47 2 WIRING DIAGRAMS AC CORD FRONT REAR VIDEO AUDIO AUDIO VIDEO AUDIO AUDIO VIDEO AUDIO AUDIO IN (R) IN (L) IN (R) IN (L) OUT (R) OUT (L) ANT-IN ANT-OUT (DECK ASSEMBLY) ACE HEAD ASSEMBLY CL504 AUDIO AE-H ERASE HEAD AE-H/FE-H A-COM AUDIO HEAD...

  • Page 48: Schematic Diagrams/Cba's And Test Points . 1 2 Wiring Diagrams

    3 SCHEMATIC DIAGRAMS 3-1 Main 1/5 Schematic Diagram...

  • Page 49: Main 2/5 & Sensor Schematic Diagrams

    3-2 Main 2/5 & Sensor Schematic Diagrams...

  • Page 50: Main 3/5 Schematic Diagram

    3-3 Main 3/5 Schematic Diagram...

  • Page 51: Main 4/5 Schematic Diagram

    3-4 Main 4/5 Schematic Diagram CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, CAUTION ! REPLACE ONLY WITH THE SAME TYPE FUSE. NOTE : Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. ATTENTION : POUR UNE PROTECTION CONTINUE LES RISQES The voltage for parts in hot circuit is measured If Main Fuse (F1001) is blown, check to see that all components in the power supply D'INCELE N'UTILISER QUE DES FUSIBLE DE MÊME TYPE.

  • Page 52: Main 5/5 Schematic Diagram

    3-5 Main 5/5 Schematic Diagram...

  • Page 53: Waveforms

    4 WAVEFORMS (TP301 of Main CBA) UPPER (TP502 of Main CBA) LOWER C-PB 10mV x 10 RF-SW 0.5V x 10 5msec (J23 of Main CBA) UPPER (TP502 of Main CBA) LOWER V-OUT 0.1V x 10 RF-SW 0.5V x 10 50usec (J23 of Main CBA) V-OUT E-E 10usec...

  • Page 54: Circuit Board Diagrams

    5 CIRCUIT BOARD DIAGRAMS 5-1 Main CBA Top View & Sensor CBA Top View CAUTION CAUTION ! FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, NOTE : Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. REPLACE ONLY WITH THE SAME TYPE FUSE.

  • Page 55: Main Cba Bottom View

    5-2 Main CBA Bottom View CAUTION CAUTION ! FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, NOTE : Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. REPLACE ONLY WITH THE SAME TYPE FUSE. The voltage for parts in hot circuit is measured If Main Fuse (F1001) is blown, check to see that all components in the power supply ATTENTION : POUR UNE PROTECTION CONTINUE LES RISQES using hot GND as a common terminal.

  • Page 56: Block Diagrams

    6 BLOCK DIAGRAMS 6-1 Servo/System Control Block Diagram SYSTEM CONTROL TP502 MAIN CBA AL+5V IC501 MICROPROCESSOR S-INH RS501 REMOTE KEY- 1 REMOCON-IN SWITCH SENSOR (DECK ASSEMBLY) D555 KEY- 2 S-LED TP513 ACE HEAD ASSEMBLY SWITCH FIP502 IC571 LED DISPLAY CL504 CTL(+) (LED DISPLAY DRIVE) CL504...

  • Page 57: Video Block Diagram

    6-2 Video Block Diagram MAIN CBA TP751 IC501 (OSD) V-OUT Q391 REC VIDEO SIGNAL PB VIDEO SIGNAL MODE: SP/REC CHARACTER BUFFER JK751 V-OUT IC301 TU701 (VIDEO SIGNAL PROCESS/ HEAD AMP) (TUNER UNIT) VIDEO IN Q301 CCD 1H BUFFER DELAY VIDEO OUT CHARA LUMINANCE DOC YNR Y/C COMB...

  • Page 58: Audio Block Diagram

    Audio Block Diagram PB-AUDIO SIGNAL REC-AUDIO SIGNAL Mode : SP/REC MAIN CBA TU701 (TUNER UNIT) SIF OUT 15 N-A-OUT MOD-A AUDIO IN JK751 A-OUT (R) FROM/TO A-OUT (L) A-OUT (R) Hi-Fi AUDIO A-IN (L) BLOCK A-IN (R) TP753 TP754 A-IN (L)-F A-OUT (L) A-OUT(R) A-OUT(L)

  • Page 59: Hi-Fi Audio Block Diagram

    6-4 Hi-Fi Audio Block Diagram PB-AUDIO SIGNAL REC-AUDIO SIGNAL Mode : SP/REC MAIN CBA IC451 (MTS/ SAP/ Hi-Fi AUDIO PROCESS/ Hi-Fi HEAD AMP) CONT SERIAL IIC-BUS SDA FROM/TO DATA IIC-BUS SCL SERVO/ SYSTEM DECODER ST/SAP CONTROL BLOCK DEMOD FILTER DEMOD MATRIX DEMOD STEREO...

  • Page 60: Power Supply Block Diagram

    6-5 Power Supply Block Diagram CAUTION CAUTION ! FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, NOTE : Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. REPLACE ONLY WITH THE SAME TYPE FUSE. The voltage for parts in hot circuit is measured using If Main Fuse (F001) is blown, check to see that all components in the power supply ATTENTION : POUR UNE PROTECTION CONTINUE LES RISQES hot GND as a common terminal.

  • Page 61: System Control Timing Charts

    7 SYSTEM CONTROL TIMING CHARTS Mode SW : LD-SW LD-SW Position detection A/D Input voltage Limit Symbol (Calculated voltage) 3.76V~4.50V (4.12V) 4.51V~5.00V (5.00V) 0.00V~0.25V (0.00V) 1.06V~1.50V (1.21V) 0.66V~1.05V (0.91V) 1.99V~2.60V (2.17V) 1.51V~1.98V (1.80V) 3.20V~3.75V (3.40V) 0.26V~0.65V (0.44V) 4.51V~5.00V (5.00V) 2.61V~3.19V (2.97V) Note: Note:...
  • Page 62 Still/Slow Control Frame Advance Timing Chart 1) SP Mode 18 RF-SW The first rise of RF-SW after a rise in F-AD signal F-AD (Internal Signal) "H" "H" "Z" C-DRIVE "L" "L" Stop detection (T2) Acceleration Detection (T1) Slow Tracking Value PB CTL Reversal Limit Value 20ms...
  • Page 63 2) LP/SLP Mode 18 RF-SW The first rise of RF-SW after a rise in F-AD signal F-AD (Internal Signal) "H" "H" "Z" C-DRIVE "L" "L" Stop detection (T2) Acceleration Detection (T1) Slow Tracking Value PB CTL Reversal Limit Value 20ms 27 C-F/R 79 H-A-SW 78 ROTA...
  • Page 64 1. EJECT (POWER OFF) -> CASSETTE IN (POWER ON) -> STOP(B) -> STOP(A) -> PLAY -> RS -> FS -> PLAY -> STILL -> PLAY -> STOP(A) PIN NO. LD-SW CL/SS 0.3S 0.3S LM-FWD "M" /REV 0.2S 0.2S 0.2S 0.2S 0.2S "Z"...
  • Page 65 2. STOP(A) -> FF -> STOP(A) -> REW -> STOP(A) -> REC -> PAUSE -> PAUSE or REC -> STOP(A) -> EJECT PIN NO. LD-SW CL/SS LM-FWD "M" /REV 0.2S 0.2S 0.2S 0.2S 0.2S 0.2S "Z" C-DRIVE 20mS 0.1S 20mS 20mS 0.4S 0.4S...

  • Page 66: Ic Pin Function Descriptions

    8 IC PIN FUNCTION DESCRIPTIONS IC501( SERVO / SYSTEM CONTROL IC ) Signal Active Function Name Level “H” ≥ 4.5V, “L” ≤ 1.0V System Reset Signal Active RESET Signal Function Name Level (Reset=”L”) Power Loading Motor LM-FWD/ Voltage Down 21 OUT FWD/ REV Out- H/Z/L P-DOWN -L...
  • Page 67 Signal Active Signal Active Function Function Name Level Name Level VDD2 VDD2 Video Head Switching Pulse PG-DELAY Low Path Filter Signal Adjusted AFCC Input Signal For Voltage A/D Key Data KEY-2 Low Path Filter Signal 2 44 OUT AFCLPF Output Signal For A/D Key Data KEY-1 Signal 1...

  • Page 68: Lead Identifications

    9 LEAD IDENTIFICATIONS BN1F4M-T 2SC1815-BL(TPE2) BA1F4M-T 2SC1815-Y(TPE2) KTA1266(GR) 2SC1815-GR(TPE2) KTC3193(Y) 2SC2120-Y(TPE2) KTC3199(Y,GR,BL) KTC3203(Y) 2SC2785(J,H,F,K) 2SA1015-GR(TPE2) KRC103M 2SC2001(K,L) KRA103M E C B E C B LA71091M RN1511(TE85R) LTV-817(B,C)-F FMG4A T148 PT6958-FN-TP QSZAC0RMS005 LA72670M MID-32A22 PT204-6B-12 Note: A: Anode K: Cathode E: Emitter C: Collector B: Base R: Reference...
  • Page 69 No. 5301E Digital Media Division, Tokai VT-FX795A...

Table of Contents