Jvc-DRMV-2-SEL-Service-Manual(1) 电路图 维修手册.pdf
SERVICE MANUAL COPYRIGHT 2005 Victor Company of Japan, Limited No.YD087 2005/11 DVD VIDEO RECORDER 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. 6) (4) Release the flat pack-IC from the CBA using tweezers. (Fig. 6) 1.2.4.1.2Caution: (1) The Flat Pack-IC shape may differ by models. Use an ap- propriate hot-air 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. 2) (3) The flat pack-IC on the CBA is affixed with glue, so be care- ful not to break or damage the foil of each pin or the solder lands under the IC when removing it. Fig.2 Top View OutIn Bottom View Input 5 10 Pin 1 Pin 1 FFC Cable Connector CBA * Be careful to avoid a short circuit. Hot-air Flat Pack-IC Desoldering Machine CBA Flat Pack-IC Tweezers Masking Tape 1-6 (No.YD087) 1.2.4.1.3With 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. 3) Fig.3 (2) Lift each lead of the flat pack-IC upward one by one, using a sharp pin or wire to which solder will not adhere (iron wire). When heating the pins, use a fine tip soldering iron or a hot air desoldering machine. (Fig. 4) Fig.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 heat up. Then remove (glue will be melted). (Fig. 6) (4) Release the flat pack-IC from the CBA using tweezers. (Fig. 6) 1.2.4.1.4With 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-IC, you can remove it easily. (Fig. 3) (2) Affix the wire to a workbench or solid mounting point, as shown in Fig. 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 shown in Fig. 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. 6) (5) Release the flat pack-IC from the CBA using tweezers. (Fig. 6) Note: When using a soldering iron, care must be taken to en- sure that the flat pack-IC is not being held by glue. When the flat pack-IC is removed from the CBA, handle it gen- tly because it may be damaged if force is applied. Fig.5 Fig.6 Flat Pack-IC Desoldering Braid Soldering Iron Fine Tip Soldering Iron Sharp Pin To Solid Mounting Point Soldering Iron Iron Wire or Hot Air Blower Fine Tip Soldering Iron CBA Flat Pack-IC Tweezers (No.YD087)1-7 1.2.4.2Installation (1) Using desoldering braid, remove the solder from the foil of each pin of the flat pack-IC on the CBA so you can install a replacement flat pack-IC more easily. (2) The ? mark on the flat pack-IC indicates pin 1. (See Fig. 7) Be sure this mark matches the 1 on the PCB when posi- tioning for installation. Then presolder the four corners of the flat pack-IC. (See Fig. 8) (3) Solder all pins of the flat pack-IC. Be sure that none of the pins have solder bridges. Fig.7 Fig.8 1.2.5Instructions 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. 1.2.5.1Ground for Human Body Be sure to wear a grounding band (1M) that is properly ground- ed to remove any static electricity that may be charged on the body. 1.2.5.2Ground for Workbench (1) Be sure to place a conductive sheet or copper plate with proper grounding (1M) on the workbench or other sur- face, where the semi-conductors are to be placed. Be- cause the static electricity charge on clothing will not escape through the body grounding band, be careful to avoid contacting semi-conductors with your clothing. Example : Pin 1 of the Flat Pack-IC is indicated by a mark. Presolder CBA Flat Pack-IC CBA CBA Grounding Band Conductive Sheet or Copper Plate 1M 1M 1-8 (No.YD087) 1.3PREPARATION FOR SERVICING 1.3.1How to Enter the Service Mode 1.3.1.1About Optical Sensors Caution: An optical sensor system is used for the Tape Start and End Sensors on this equipment. Carefully read and follow the in- structions 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 Mech- anism Assembly. Make sure the power is on, connect TP507 (S-INH) to GND. This will stop the function of Tape Start Sen- sor, Tape End Sensor and Reel Sensors. (If these TPs are connected before plugging in the unit, the function of the sen- sors will stay valid.) See Fig. 1. Fig.1 Note: Because the Tape End Sensors are inactive, do not run a tape all the way to the start or the end of the tape to avoid tape dam- age. Q504 Q503 TP501 S-INH (No.YD087)1-9 1.4LASER BEAM SAFETY PRECAUTIONS This DVD player uses a pickup that emits a laser beam. The laser beam is emitted from the location shown in the figure. When checking the laser diode, be sure to keep your eyes at least 30 cm away from the pickup lens when the diode is turned on. Do not look directly at the laser beam. CAUTION: Use of controls and adjustments, or doing procedures other than those specified herein, may result in hazardous radiation exposure. Location: Top of DVD mechanism. Do not look directly at the laser beam coming from the pickup or allow it to strike against your skin. Drive Mechanism Assembly Laser Beam Radiation Laser Pickup Turntable 1-10 (No.YD087) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.YD087)1-11 SECTION 3 DISASSEMBLY 3.1CABINET DISASSEMBLY INSTRUCTIONS 3.1.1Disassembly Flowchart This flowchart indicates the disassembly steps to gain access to item(s) to be serviced. When reassembling, follow the steps in reverse order. Bend, route, and dress the cables as they were originally. 3.1.2Disassembly Method Note: (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, un- locked, released, unplugged, unclamped, or desoldered. P = Spring, L = Locking Tab, S = Screw, CN = Connector * = Unhook, Unlock, Release, Unplug, or Desolder e.g. 6(S-1) = six Screws (S-1), 5(L-1) = two Locking Tabs (L-1) (5) Refer to Reference Notes. 1 Top Cover 2 Front Assembly 4 Radiation Sheet 3 Front Bracket 5 Jack Bracket 6 Front Jack CBA 7 DVD Mechanism see the positions of 44 and 45 in Fig.1 on page 1-20. When reassembling, follow the steps in reverse order. STEP/ LOC. No. STARTING No. PARTREMOVALINSTALLATION Fig. No.REMOVE/*UNHOOK/ UNLOCK/RELEASE/ UNPLUG/DESOLDER ADJUSTMENT CONDITION 11Guide Holder AT32(S-1) 21Cassette Holder AssemblyT4 32Slider (SP)T5(S-1A), *(L-1) 42Slider (TU)T5*(L-2) 54Lock LeverT5*(L-3), *(P-1) 62Cassette PlateT5 77Cylinder AssemblyT 1,6Desolder, 3(S-2) 88Loading Motor AssemblyT1,7Desolder, LDG Belt, 2(S-3) 99ACE Head AssemblyT1,7(S-4) 102Tape Guide Arm AssemblyT1,8*(P-2) 1110C Door OpenerT1,8(S-4A), *(L-4) 1211Pinch Arm (B)T1,8,9*(P-3) 1312Pinch Arm (A) AssemblyT1,8,9 1414FE HeadT1,10(S-5) 1515PrismT1,10(S-6) 162Slider ShaftT11*(L-5) 1716C Drive Lever (SP)T11 1816C Drive Lever (TU)T 11(S-7), *(P-4) 1919Capstan MotorB2,123(S-8), Cap Belt 2020Clutch Assembly (HI)B2,13(C-1) 2120Center GearB13 *2222F Brake Assembly (HI)B2,13*(L-6) 2322Worm HolderB2,14(S-9), *(L-7), *(L-8) 2422Pulley Assembly (HI)B2,14 2525Mode Gear (LM)B2,14(C-2) 2620,25Mode Lever (HI)B2,14,15(C-3) 2722,23,26 Cam Gear (A) (HI)B2,14,15(C-4)(+)Refer to Alignment Sec.Page 1-41 2826TR Gear CB2,14(C-5) 2928TR Gear SpringB14 3029TR Gear A/BB14 3131FF Arm (HI)B1,16 3226Idler Assembly (HI)B1,16*(L-9) 3326BT ArmB2,16*(P-5) 3426Loading Arm (SP)AssemblyB2,16(+)Refer to Alignment Sec.Page 1-41 3534Loading Arm (TU) AssemblyB2,16(+)Refer to Alignment Sec.Page 1-41 3616,26M Brake (TU) Assembly (HI)T1,17 372,26M Brake (SP)Assembly (HI)T1,17*(P-6) (No.YD087)1-19 (1) Follow steps in sequence. When reassembling, follow the steps in reverse order. These numbers are also used as identification (location) No. of parts in the figures. (2) Indicates the part to start disassembling with in order to disassemble the part in column (1). (3) Name of the part (4) Location of the part: T=Top B=Bottom R=Right L=Left (5) Figure Number (6) Identification of parts to be removed, unhooked, unlocked, released, unplugged, unclamped, or desoldered. P=Spring, W=Washer, C=Cut Washer, S=Screw, *=Unhook, Unlock, Release, Unplug, or Desolder e.g., 2(L-2) = two Locking Tabs (L-2). (7) Adjustment Information for Installation (+):Refer to Deck Exploded Views for lubrication. * 22 F Brake Assembly (HI) is not used in 2 head model. 3837Tension Lever AssemblyT1,17 3938T Lever HolderT17*(L-10) 4040M Gear (HI)T1,17(C-6) 4115,40Sensor Gear (HI)T1,17(C-7) 4236,40Reel TT1,17 4338Reel ST1,17 4434,38Moving Guide S PreparationT1,18(S-11), Slide Plate 4535Moving Guide T PreparationT1,18 4619TG Post AssemblyT1,18*(L-11) 4727Rack AssemblyR19(+)Refer to Alignment Sec.Page 1-41 4847F Door OpenerR19 4949Cleaner AssemblyT1,6 5049CL PostT6*(L-12) (1) (2) (3) (4) (5) (6) (7) STEP/ LOC. No. STARTING No. PARTREMOVALINSTALLATION Fig. No.REMOVE/*UNHOOK/ UNLOCK/RELEASE/ UNPLUG/DESOLDER ADJUSTMENT CONDITION 1-20 (No.YD087) Fig.1 Fig.2 14 13 11 10 12 7498 324341403142 4544469 36 15 38 37 Top View 34 19 35 25 26 24 23 27 33202822 Bottom View (No.YD087)1-21 Fig.3 Fig.4 Fig.5 1 (S-1) (S-1) 2 Locking tab View for A First, while pushing the locking tab as shown in the right, slide and pull up the right side on 2 to release Pin A and Pin B from the slots A. Then, remove Pin C and Pin D on 2 from the slots B as shown. Pin A Slots B Pin C Pin B Pin D Slot A Slot A Pull up Slide1 2 A 3 6 6 (L-2) Pin A Hole A Pin B Hole B (L-1) First, insert 6 diagonally in 3 as shown below. Then, install 6 in 3 while pushing (L-1) in a direction of arrow. After installing 6 in 3, confirm that pin A of 3 enters hole A of 6 properly. Installation of 3 and 6 View for A 2 1 4 Install 6 in 4 while pulling (L-2) in a direction of arrow. After installing 6 in 4, confirm that pin B of 4 enters hole B of 6 properly. Installation of 4 and 6 View for B 3 4 5 6 (L-1) (L-2) (P-1) (L-3) (S-1A) A B 1-22 (No.YD087) Fig.6 Fig.7 Fig.8 A (S-2) 7 (L-12) 49 50 View for A Desolder from bottom Lead with Red Stripe 8 9 (S-4) (S-3) LDG Belt View for A Desolder from bottom Lead with White Stripe A 8 11 13 12 10 (L-4) (P-3) (P-2) Pin of 12 Pin of 10 Groove of 27 View for A When reassembling 10 and 12, confirm that pin of 10 and pin of 12 are in the groove of 27 as shown. 27 Removal of 11 1) Remove screw (S-4A). 2) Unhook spring (P-2). 3) Release (L-4) while holding 12 with a finger. 4) Loosen a finger holding 12 and remove 11. A (S-4A) (No.YD087)1-23 Fig.9 Fig.10 Fig.11 Installation of 13 and 12 Pin of 12 Groove of 27 Hook spring (P-3) up to 12 and 13, then install them to the specified position so that 12 will be floated slightly while holding 12 and 13. (Refer to Fig. A.) Fig. A 13 12 (P-3) Fig. B (Top view) Install pin of 12 in groove of 27. (Refer to Fig. B.)27 Press both 12 and 13 till the groove of chassis pin appears, and adjust 13 to the notch of chassis. Then turn 13 a little in the direction of the arrow while pressing 12. (Refer to Fig. C.) Fig. C Groove of pin of chassis Notch of chassis turn 13 12 Install 11 and 10 while holding 12. (Refer to Fig. 8.) 14 15 (S-6) (S-5) 17 16 (L-5) 18 (P-4) (S-7) 1-24 (No.YD087) Fig.12 Fig.13 19 Cap Belt (S-8) 19 20Cap Belt A Installation position of Cap Belt View for A (L-6) 22 20 (C-1) 21 27 Pin on 22 Position of pin on 22 turn (No.YD087)1-25 Fig.14 Fig.15 Fig.16 27 31 (C-3) 26 (C-4) 25 (C-2) 28 29 30 (C-5) (S-9) 24 23 (L-7) (L-8) 27 27 26 Top View First tooth on 47 First groove on 27 Align 26 and 27 as shown. Pin of 36 Pin of 33 Position of Mode Lever when installed Pin of 37 Bottom View Installation of 26 When reassembling 27, meet the first groove on 27 to the first tooth on 47 as shown. 32 (L-9) (P-5) 34 35 Refer to the Alignment Section, Page 1-41. 33 1-26 (No.YD087) Fig.17 Fig.18 Fig.19 39 (L-10) 37 (P-6) 43 38 36 42 40 41 (C-6) (C-7) turn turn turn 44 45 46 (L-11) Slide Plate (S-11) 47 48 Slide (No.YD087)1-27 SECTION 4 ADJUSTMENT 4.1ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: CBA is an abbreviation for Circuit Board As- sembly. NOTE: (1) Electrical adjustments are required after replacing circuit components and certain mechanical parts. It is important to do these adjustments only after all re- pairs and replacements have been completed. Also, do not attempt these adjustments unless the proper equip- ment is available. (2) To perform these alignment / confirmation procedures, make sure that the tracking control is set inthe center po- sition: Press either ”PR -” or “PR +” button on the front panel first, then the VCR “?“button on the front panel. 4.1.1Test Equipment Required (1) Oscilloscope: Dual-trace with 10:1 probe, V-Range: 0.00150V/Div., F-Range: DCAC-20MHz (2) Alignment Tape (MHPE) 4.1.2Head Switching Position Adjustment Purpose: To determine the 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 waveform is at the 6.5H1H (416s64s) delayed position from the rising edge of the CH2 head switching pulse waveform. Test pointAdj.PointModeInput J236(JK1-V-OUT) TP504(RF-SW) GND VR501 (Switching Point) (MAIN CBA) PLAY (SP) - Tape Measurement Equipme nt Spec. MHPEOscilloscope 6.5H1H (416s64s) Connections of Measurement Equipment Figur e 1 Oscilloscope Main CBA J236 CH1 CH2 Trig. (+) GND TP504 EXT. Syncronize Trigger Point 1.0H CH1 CH2 Switching Pulse 6.5H+/-1H (416s+/-64s)V-Sync 0.5H 1-28 (No.YD087) 4.2STANDARD MAINTENANCE 4.2.1Service Schedule of Components This maintenance chart shows you the standard of replacement and cleaning time for each part. Because those may replace depending on environment and purpose for use, use the chart for reference. Notes: (1) Clean all parts for the tape transport (Upper Drum with Video Head / Pinch Roller / ACE Head / FE Head)using 90% ethyl alcohol. (2) After cleaning the parts, do all DECK ADJUSTMENTS. (3) For the reference numbers listed above, refer to Deck Exploded Views. * B73 - Recording model only * B86 - Not used in 2 head model.
