Scott-VCX-602-Service-Manual 电路图 维修手册.pdf

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1、SERVICE MANUAL VIDEO CASSETTE RECORDER VCX602 Sec. 1: Main Section I Specifications I Preparation for Servicing I Adjustment Procedures I Schematic Diagrams I CBAs I Exploded views I Parts List Sec. 2: Deck Mechanism Section I Standard Maintenance I Alignment for Mechanism I Disassembly/Assembly of

2、Mechanism I Alignment Procedures of Mechanism I Deck Exploded Views I Deck Parts List SECAMPAL RadioFans.CN 收音机爱 好者资料库 MAIN SECTION VIDEO CASSETTE RECORDER VCX602 TABLE OF CONTENTS Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . . . . . . . . . . . . . . . . . . 1-1-1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2-1 Standard Notes for Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3-1 Preparation for Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4-1 Cabinet Disassembly Instructions. . . . . . . . . . . . . . . . . . . . . . .

5、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5-1 Electrical Adjustment Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6-1 Block Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . .

6、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-1 Function Indicator Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-5 Schematic Diagrams / CBAs and Test Points. . .

7、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8-1 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9-1 Wiring Diagrams . . . . . . . . . .

8、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10-1 IC Pin Function Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11-1 Lead Identifica

9、tions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12-1 Exploded Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10、 . 1-13-1 Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14-1 Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11、 . . . . . . . . . . . . . . 1-15-1 Sec. 1: Main Section I Specifications I Preparation for Servicing I Adjustment Procedures I Schematic Diagrams I CBAs I Exploded Views I Parts List RadioFans.CN 收音机爱 好者资料库 1-1-1HG240SP SPECIFICATIONS Note: Nominal specs represent the design specs. All units should

12、 be able to approximate these some will exceed and some may drop slightly below these specs. Limit specs represent the absolute worst condition that still might be considered acceptable; In no case should a unit fail to meet limit specs. DescriptionUnitMinimumNominalMaximumRemark 1. Video 1-1. Video

13、 Output (PB)Vp-p0.81.01.2FL6A 1-2. Video Output (R/P)Vp-p0.81.01.2 1-3. Video S/N Y (R/P)dB4045 SP Mode, W/O Burst 1-4. Video Color S/N AM (R/P)dB3741SP Mode 1-5. Video Color S/N PM (R/P)dB3036SP Mode 1-6. Resolution (PB)Line230245SP Mode 2. Servo 2-1. Jitter Lowsec0.070.12SP Mode 2-2. Wow when remo

14、ving entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6) (4) Release the flat pack-IC from the CBA using twee- zers. (Fig. S-1-6) Caution: 1. The Flat Pack-IC shape may differ by models. Use an appropriate hot-air

15、 flat pack-IC desoldering machine, whose shape matches that of the Flat Pack-IC. 2. Do not supply hot air to the chip parts around the flat pack-IC for over 6 seconds because damage to the chip parts may occur. Put masking tape around the flat pack-IC to protect other parts from damage. (Fig. S-1-2)

16、 Top View OutIn Bottom View Input 5 10 Pin 1 Pin 1 FFC Cable Connector CBA * Be careful to avoid a short circuit. Fig. S-1-1 1-3-2NOTE_1 3. The flat pack-IC on the CBA is affixed with glue, so be careful not to break or damage the foil of each pin or the solder lands under the IC when removing it. W

17、ith Soldering Iron: (1)Using desoldering braid, remove the solder from all pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-IC, you can remove it easily. (Fig. S-1-3) (2)Lift each lead of the flat pack-IC upward one by one, using a sharp pin or wire to

18、 which solder will not adhere (iron wire). When heating the pins, use a fine tip soldering iron or a hot air desoldering machine. (Fig. S-1-4) (3) Bottom of the flat pack-IC is fixed with glue to the CBA; when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and

19、 heat up. Then remove (glue will be melted). (Fig. S-1-6) (4) Release the flat pack-IC from the CBA using twee- zers. (Fig. S-1-6) With Iron Wire: (1) Using desoldering braid, remove the solder from all pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-

20、IC, you can remove it easily. (Fig. S-1-3) (2) Affix the wire to a workbench or solid mounting point, as shown in Fig. S-1-5. (3) While heating the pins using a fine tip soldering iron or hot air blower, pull up the wire as the solder melts so as to lift the IC leads from the CBA contact pads as sho

21、wn in Fig. S-1-5 (4) Bottom of the flat pack-IC is fixed with glue to the CBA; when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6) (5) Release the flat pack-IC from the CBA using twee- zers. (Fig. S-

22、1-6) Note: When using a soldering iron, care must be taken to ensure that the flat pack-IC is not being held by glue. When the flat pack-IC is removed from the CBA, handle it gently because it may be damaged if force is applied. Fig. S-1-2 Hot-air Flat Pack-IC Desoldering Machine CBA Flat Pack-IC Tw

23、eezers Masking Tape Fig. S-1-3 Flat Pack-IC Desoldering Braid Soldering Iron Fig. S-1-4 Fine Tip Soldering Iron Sharp Pin Fig. S-1-5 To Solid Mounting Point Soldering Iron Iron Wire or Hot Air Blower 1-3-3NOTE_1 2. Installation (1)Using desoldering braid, remove the solder from the foil of each pin

24、of the flat pack-IC on the CBA so you can install a replacement flat pack-IC more easily. (2)The “ I ” mark on the flat pack-IC indicates pin 1. (See Fig. S-1-7.) Be sure this mark matches the 1 on the PCB when positioning for installation. Then presolder the four corners of the flat pack-IC. (See F

25、ig. S-1-8.) (3)Solder all pins of the flat pack-IC. Be sure that none of the pins have solder bridges. Instructions for Handling Semi-conductors Electrostatic breakdown of the semi-conductors may occur due to a potential difference caused by electro- static charge during unpacking or repair work. 1.

26、 Ground for Human Body Be sure to wear a grounding band (1M) that is prop- erly grounded to remove any static electricity that may be charged on the body. 2. Ground for Workbench Be sure to place a conductive sheet or copper plate with proper grounding (1M) on the workbench or other surface, where t

27、he semi-conductors are to be placed. Because the static electricity charge on cloth- ing will not escape through the body grounding band, be careful to avoid contacting semi-conductors with your clothing. Fig. S-1-6 Fine Tip Soldering Iron CBA Flat Pack-IC Tweezers Fig. S-1-7 Example : Pin 1 of the

28、Flat Pack-IC is indicated by a mark. Fig. S-1-8 Presolder CBA Flat Pack-IC CBA Grounding Band Conductive Sheet or Copper Plate 1M 1M CBA 1-4-1HG240PFS 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 Se

29、nsors 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. The tape will be loaded into the Deck Mechanism Assembly. Make sure the power is

30、 on, connect TP507 (S-INH) to GND. This will stop the function of Tape Start Sensor, Tape End Sensor and Reel Sensors. (If these TPs are connected before plugging in the unit, the function of the sensors will stay valid.) See Fig. 1. Note: Because the Tape End Sensors are inactive, do not run a tape

31、 all the way to the start or the end of the tape to avoid tape damage. Fig. 1 TP507 S-INH Q504 Q505 1-5-1HG240DC CABINET DISASSEMBLY INSTRUCTIONS 1. Disassembly Flowchart This flowchart indicates the disassembly steps to gain access to item(s) to be serviced. When reassembling, follow the steps in r

32、everse order. Bend, route, and dress the cables as they were originally. 2. Disassembly Method (1): Identification (location) No. of parts in the figures (2): Name of the part (3): Figure Number for reference (4): Identification of parts to be removed, unhooked, unlocked, released, unplugged, unclam

33、ped, or desoldered. P=Spring, L=Locking Tab, S=Screw, CN=Connector *=Unhook, Unlock, Release, Unplug, or Desolder e.g. 2(S-2) = two Screws (S-2), 2(L-2) = two Locking Tabs (L-2) (5): Refer to “Reference Notes.” Reference Notes CAUTION: Locking Tabs (L-1) and (L-2) are fragile. Be careful not to brea

34、k them. 1. Remove five Screws (S-2), two Screws (S-3) and Screw (S-4). Then, slowly lift the VCR Chassis Unit (Deck Assembly, Jack CBA and Main CBA) up. 2. When reassembling, solder wire jumpers as shown in Fig. D5. 3. Before installing the Deck Assembly, be sure to place the pin of LD-SW on Main CB

35、A as shown in Fig. D6. Then, install the Deck Assembly while aligning the hole of Cam Gear with the pin of LD- SW, the shaft of Cam Gear with the hole of LD-SW as shown in Fig. D6. ID/ LOC. No. PART REMOVAL Fig. No. REMOVE/*UNHOOK/ UNLOCK/RELEASE/ UNPLUG/DESOLDER Note 1Top CaseD17(S-1)- 2 Front Asse

36、mbly D2*3(L-1),*4(L-2)- 3 VCR Chassis Unit D35(S-2), 2(S-3), (S-4), 1 4Jack CBAD4Desolder, (S-5)- 5 Deck Assembly D5, D6 2(S-6), Desolder2,3 6Main CBAD5- 7 Cylinder Shield D5(S-7)- (1) (2) (3) (4) (5) 5 Deck Assembly 4 Jack CBA 1 Top Case 2 Front Assembly 3 VCR Chassis Unit 6 Main CBA 7 Cylinder Shi

37、eld 1-5-2HG240DC Fig. D1 (S-1) (S-1) (S-1) 1 Top Case Fig. D2 (L-2) (L-1) 2 Front Assembly (L-2) Fig. D3 (S-2) (S-2) (S-4) (S-2) (S-2) (S-3) (S-3) 3 VCR Chassis Unit Fig. D4 (S-5) 4 Jack CBA Desolder 1-5-3HG240DC Fig. D5 (S-7) 5 Deck Assembly FE Head Cylinder Assembly ACE Head Assembly 7 Cylinder Sh

38、ield 6 Main CBA (S-6) (S-6) From FE Head From Cylinder Assembly From ACE Head Assembly Lead with white stripe Lead with blue stripe Desolder from bottom Lead with blue stripe From Capstan Motor Assembly Lead connections of Deck Assembly and Main CBA Printing side TOP VIEW Fig. D6 6 Main CBA SW507 LD

39、-SW LD-SW Pin Hole Hole Shaft Cam Gear 6 Main CBA 5 Deck Assembly Pin 1-6-1HG240EA ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: CBA is an abbreviation for Circuit Board Assembly. NOTE: 1.Electrical adjustments are required after replacing circuit components and certain mechanical parts. It is im

40、portant to do these adjustments only after all repairs and replacements have been com- pleted. Also, do not attempt these adjustments unless the proper equipment is available. 2.To perform these alignment / confirmation proce- dures, make sure that the tracking control is set in the center position:

41、 Press either L or K button on the remote control unit first, then the PLAY button (Front Panel only). Test Equipment Required 1.Oscilloscope: Dual-trace with 10:1 probe, V-Range: 0.00150V/Div., F-Range: DCAC-20MHz 2.Alignment Tape (FL6A) Head Switching Position Adjustment Purpose: To determine the

42、Head Switching position during playback. Symptom of Misadjustment: May cause Head Switching noise or vertical jitter in the picture. Reference Notes: Playback the Alignment tape and adjust VR501 so that the V-sync front edge of the CH1 video output wave- form is at the 6.5H1H(412.7s63.5s) delayed po

43、si- tion from the rising edge of the CH2 head switching pulse waveform. Test pointAdj.PointModeInput J23(V-OUT) TP502(RF-SW) GND VR501 (Switching Point) (MAIN CBA) PLAY (SP) - Tape Measurement Equipment Spec. FL6AOscilloscope 6.5H1H (412.7s63.5s) Connections of Measurement Equipment Figure 1 Oscillo

44、scope Main CBA J23 CH1 CH2 Trig. (+) GND TP502 EXT. Syncronize Trigger Point 1.0H CH1 CH2 Switching Pulse 6.5H+/-1H (412.7s+/-63.5s)V-Sync 0.5H BLOCK DIAGRAMS Servo/System Control Block Diagram HG223BLS1-7-1 M M LOADING MOTOR CYLINDER ASSEMBLYCAPSTAN MOTOR DRUM MOTOR PG SENSOR CN504 MAIN CBA KEY- 2

45、C-CONT C-FG D-PFG ST-S T-REEL C-F/R KEY- 1 REMOCON-IN CTL(+) RESET PG-DELAY CTL(-) D-V SYNC D-REC-H RF-SW C-ROTA END-S 14 90 87 94 95 CTL AMP OUT97 76 10 4 80 34 78 2 15 13 18 33 31 8 7 RS501 REMOTE SENSOR 81 D-CONT77 T-REEL Q501 Q562 Q563 Q564 Q565 RESET Q503 S-REEL79 SW-POINT AL+5V VR501 TIMER+5V

46、S-REEL PS503 IIC-BUS SDA IIC-BUS SDA IIC-BUS SCL A-MUTE-H A-MUTE-H V-ENV 6 P-ON-H C-POW-SW P-ON-H C-POW-SW P-DOWN-L 67 66 86P-DOWN-L SW506 FROM/TO VIDEO BLOCK TO AUDIO BLOCK SDA SDA SCL SCL TU701(TUNER UNIT) IC503 (MEMORY) 72 83 IIC-BUS SCL D-V-SYNC D-REC-H RF-SW C-ROTA IIC-BUS SDA V-ENV IIC-BUS SCL

47、71 3 5 SDA SCL 12 11 CAS-LED TIMER-LED REC-LED26 25 24 POWER-LED23 D565REC D564TIMER D563CAS D562POWER D561STAND-BY +5V LD-SW9 AL+12V/+20.5V P-ON+15V AL+5V AL+5V SW507 AL+12V P-ON+5V LD-SW AL+5V D502 S-LED FROM/TO POWER SUPPLY BLOCK KEY SWITCH KEY SWITCH TP507 SENS-INH M CAPSTAN MOTOR IC501 (SERVO/S

48、YSTEM CONTROL) AUDIO-SW-129 AUDIO-SW-230 AUDIO-SW-1 AUDIO-SW-2 5 6 CN502 12P-ON+15V 11AL+12V(2) 10GND 9D-PFG 8D-CONT 7LM-FWD/REV 6GND 5C-CONT 4C-F/R 3C-FG 2P-ON+5V 1AL+12V/+20.5V SENSOR CBA SENSOR CBA END-S ST-S Q504 Q505 REC- SAFETY LM- FWD/REV REC- SAF-SW TP506 END-S CONTROL HEAD AC HEAD ASSEMBLY

49、(DECK ASSEMBLY) TP501 CTL 2 CTL(+) 1 CTL(-) C-SYNC 58C-SYNC TRICK-H 65TRICK-H SECAM-H 61SECAM-H Video Block Diagram HG223BLV1-7-2 CYLINDER ASSEMBLY V(R) V-COM V(L) CN253 1 2 3 VIDEO (R)-1 HEAD SP HEAD AMP EP HEAD AMP REC FM AGC FROM/TO SERVO/SYSTEM CONTROL BLOCK FROM SERVO/SYSTEM CONTROL BLOCK RF-SW D-REC-H C-ROTA D-V-SYNC V-ENV LUMINANCE SIGNAL PROCESS CHROMINANCE SIGNAL PROCESS V-ENV D-V-SYNC C-ROTA/RF-SW VIDEO (L)-1 HEAD TU701(TUNER UNIT) IC301 (Y/C SIGNAL PROCESS) IC501(OSD) REC-VIDEO SIGNAL PB-VIDEO SIGNAL MODE: S