Hitachi DVRF 7 U Service Manual
This is the 93 pages manual for Hitachi DVRF 7 U Service Manual.
Read or download the pdf for free. If you want to contribute, please upload pdfs to audioservicemanuals.wetransfer.com.
Extracted text from Hitachi DVRF 7 U Service Manual (Ocr-read)
Page 1
Contents - 1 Table of contents 1 Safety Precaution for Repair ........... 1-1 1-1 Cautions ................................................. 1-1 1-2 Use of Solder f or Repairs....................... 1-1 1-3 Use of Solder f or Repairs....................... 1-1 1-4 Electrostatic Protection Measures ..........1-2 1-5 Notes When Using Ser vice Manual........ 1-3 2 General Description ......................... 2-1 2-1 Overvie w ................................................ 2-1 2-1-1 Service method................................... 2-1 2-1-2 Disc infor mation................................... 2-2 2-2 Features ................................................. 2-4 2-3 Specifications ......................................... 2-5 2-4 Major Differences from Previous Model .. 2-6 2-5 Function Differences from Previous Model ....................................... 2-7 2-6 Names of Pa rts ....................................... 2-8 2-7 List of Abbreviations and Terms for DVD Recorder ............................................... 2-11 3 Details of Se rvicing and T rou bleshooting ............................... 3-1 3-1 Details of Ser vicing................................. 3-1 3-1-1 Removing Disc from Faulty Recorder ... 3-1 3-1-2 Removing Video Cassette from Faulty Recorder ............................................. 3-1 3-1-3 Firmw are .............................................. 3-2 3-2 Troub leshooting ...................................... 3-3 4 Disassemb ly and Reassem bly ........ 4-1 4-1 Order of Disassemb ly ............................. 4-1 4-2 Cabinet Disassemb ly .............................. 4-1 (1) Top Co ver ................................................. 4-1 (2) Front Panel............................................... 4-2 (3) Rear Panel and FAN Motor ....................... 4-2 (4) DVD Multi Drive ........................................ 4-3 (5) DVD Main P.C.B and Jack P.C.B ............... 4-3 (6) Front P. C.B ............................................... 4-4 (7) Deck M echanism ...................................... 4-4 (8) Key P.C.B and VCR Main P.C.B ................ 4-5 4-3 VCR Deck Pa rts Locations..................... 4-6 4-3-1 Top Vie w .............................................. 4-6 4-3-2 Bottom Vie w ........................................ 4-7 4-4 VCR Deck Mechanism Disassembly ...... 4-8 (1) Holder FL Cassette Ass'y Removal .......... 4-8 (2) Lever FL Arm Ass'y Removal ................... 4-8 (3) Lever FL Door Removal........................... 4-9 (4) Slider FL Drive, Gear FL Cam Removal ... 4-9 (5) Gear Worm Wheel Removal................... 4-10 (6) Cable Flat Removal ................................ 4-10 (7) Motor Loading Ass'y Remo val ................ 4-11 (8) Bracket Gear, Gear Joint 2, 1 Removal .. 4-11 (9) Gear Loading Drive, Slider Cam, Lever Load S, T Ass'y Remo val ............................... 4-12 (10) Lever Pinch Drive, Lever Tension Drive Removal ............................................... 4-13 (11) Lever Tension Ass'y, Band Brake Ass'y Removal ............................................... 4-13 (12) Lever Brake S, T Ass'y Removal .......... 4-14 (13) Gear Idle Ass'y Removal ...................... 4-14 (14) Disk S, T Reel Removal........................ 4-15 (15) Holder Clutch Ass'y Remo val ............... 4-15 (16) Lever Up Down Ass'y, Gear Center Ass'y Removal ............................................... 4-16 (17) Guide Cassette Door Remo val ............. 4-17 (18) Lever Unit Pinch Ass'y, Plate Joint, Spring Pinch Drive Removal ............................ 4-17 (19) Lever #9 Guide Ass'y Removal ............. 4-18 (20) FE Head Removal................................ 4-18 (21) ACE Head Re moval............................. 4-19 (22) Slider S, T Ass'y Removal.................... 4-19 (23) Plate Ground Deck, Cylinder Ass'y Removal ............................................... 4-20 (24) Hook Capstan, Belt Pulley Removal ..... 4-20 (25) Motor Capstan Ass'y Remova l ............. 4-21 (26) Post #8 Guide Ass'y Removal.............. 4-21 4-5 The table of cleaning, Lubrication and replacement time about principal parts . 4-22 5 Adjustmen t........................................ 5-1 5-1 Set-up for Adjustment............................. 5-1 5-2 VCR Electrical Adjustment..................... 5-2 5-2-1 Reference ............................................. 5-2 5-2-2 Head Switching Adjustment.................. 5-3 5-2-3 NVRAM Option Setting ......................... 5-3 5-3 VCR Mechanism Adjustment .................. 5-4 5-3-1 Tape Transport System and Adjustment Locations ............................................. 5-4
Page 2
Contents - 2 5-3-2 Tape Transport System Adjustment ..... 5-5 5-3-3 Reel Torque........................................ 5-10 6 Exploded View and Pa rts List.......... 6-1 6-1 Exploded Views...................................... 6-1 6-1-1 Cabinet Section ................................... 6-1 6-1-2 Deck Mechanism Section-Top view ..... 6-2 6-1-3 Deck Mechanism Section-Bottom view 6-3 6-2 Parts List ................................................. 6-4 6-2-1 Mechanical Par ts List........................... 6-4 6-2-2 Electrical Par ts List............................... 6-5 S Schematic, Wiring Diagrams .......... S-1 S-1 Wiring Diag ram....................................... S-1 S-2 S.M.P.S Schematic Diagram ................... S-2 S-3 Power Schematic Diagram ..................... S-3 S-4 Logic Schematic Diag ram ....................... S-4 S-5 A/V Schematic Diag ram ......................... S-5 S-6 Hi/Fi/MTS Schematic Diag ram ............... S-6 S-7 MUX & TM & A/V Input Schematic Diag ram ................................ S-7 S-8 MUX Connector Schematic Diag ram ...... S-8 S-9 Audio Out Schematic Diagram ................ S-9 S-10 Video Out Schematic Diagram ............ S-10 S-11 Front/Key Schem atic Diagram ............. S-11 C Circuit Board Diagrams .................. C-1 C-1 VCR Main P. C.B .................................... C-1 C-2 Jack P.C.B ............................................ C-3 C-3 Front P. C.B ............................................ C-5 C-4 Key P.C.B ............................................... C-5 B Block Diagram ................................. B-1