Important Safety Precautions INSTRUCTIONS 1. DISASSEMBLY 1.1 DISASSEMBLY FLOW CHART... 1-1 1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY ... 1 -1 1.3 DISASSEMBLY/ASSEMBLY METHOD... 1-1 1.4 CASSETTE HOUSING INSTALLATION...1-4 1.5 SERVICE POSITION...1-4 1.5.1 How to take out the Mechanism and Main board assemblies... 1 -4 1.5.2 Cautions on cassette loading when mechanism is in service position... 1-5 1.5.3 Cassette loading and ejecting procedures when mechanism is in service position...1-5 1.5.4 Opening on the chassis...1 -6 1.6 MECHANISM SERVICE MODE...1-7 1.6.1 How to set the “MECHANISM SERVICE MODE*...1-7 1.7 EMERGENCY DISPLAY FUNCTION...1-8 1.7.1 How to display record of an emergency faults...1-8 1.7.2 Detail of emergency faults...1 -8 1.7.3 How to clear emergency record...1-8 2. MECHANISM ADJUSTMENT 2.1 PREPARATION...2-1 2.1.1 Precautions...2-1 2.1.2 Check without cassette housing assy...2-1 2.1.3 Manual removal of loaded tape...2-1 2.1.4 Test Equipment...2-2 2.2 MAIN MECHANISM PARTS...2-2 2.2.1 Cleaning...2-3 2.2.2 Lubrication...2-3 2.3 INSPECTION AND MAINTENANCE...2-4 2.3.1 Suggested servicing schedule for main Components 2-4 2.4 DISASSEMBLY/ASSEMBLY PROCEDURE OF MECHANISM ... 2-4 2.4.1 Precaution before disassembling mechanism...2-4 2.4.2 How to set the exclusive mechanism operation mode (MECHANISM ASSEMBLING MODE)...2-4 2.5 MAIN PARTS REPLACEMENT OF MECHANISM...2-4 2.5.1 Pinchi Roller Arm Assy...2-4 2.5.2 A/C Head...2-5 2.5.3 Pinch plate...2-5 2.5.4 Mode Motor... 2-6 2.5.5 Lever Assy,Sub Deck Assy,Capstan Motor...2-6 2.5.6 Cortrol Bracket-1,Earth Plate...2-7 2.5.7 Reel Bracket, Slit Disk (take-up)...2-7 2.5.8 Control Bracket-2.Control Plate...2-7 2.5.9 Sub Brake (take-up),Cortrol Cam...2-8 2.5.10 Slide Plate... 2-8 2.5.11 Change Lever,Rotary Encoder...2-8 2.5.12 Sub Brake (supply), Tension Band Assy .Tension Arm Assy, Take-up Lever Assy, Slit Disk (supply)...2-9 2.5.13 Take -up Head, Tension Arm Lever...2-9 2.5.14 Guide Rail...2-10 2.5.15 Stator Assy...2-10 2.5.16 Rotor Assy...2-10 2.5.17 Upper Drum Assy...2-11 2.6 CHECKUP AND ADJUSTMENT OF MECHANISM PHASE ... 2-12 2.6.1 Precaution...2-12 2.6.2 Loading Arm Assy(supply,take-up)... 2-12 2.6.3 Rotary Encoder,Change Lever,Control Cam...2-13 2.6.4 Slide plate...2-13 2.6.5 Control Plate...2-13 Section Title Page 2.7 TAPE INTERCHANGEABILITY ADJUSTMENT...2-14 2.7.1 Tape pattern ...-...2-14 2.7.2 A/C head height & azimuth...2-15 2.7.3 A/C head phase (X-value)...2-16 2.7.4 LP mode auto tracking...2-16 2.7.5 Tension pole position...2-17 2.7.6 Take-up torque...2-17 3.ELECTRICAL ADJUSTMENT 3.1 PRECAUTION...3-1 3.1.1 Required test equipment...3-1 3.1.2 Required adjustment tools...3-1 3.1.3 Colour bar signal,colour bar pattern...3-1 3.2 SERVO CIRCUIT...3-2 3.3 VIDEO CIRCUIT...3-3 3.3.1 EE Y LEVEL...3-3 3.3.2 WHITE / DARK CLIP...3-3 3.3.3 CARRIER...3-4 3.3.4 DEVIATION...3-4 3.3.5 REC COLOR LEVER...3-4 3.3.6 PB Y LEVEL...3-4 3.4 SYSCON CIRCUIT...3-5 3.4.1 Timer clock...3-5 3.5 Tuner CIRCUIT...3-5 3.5.1 RFAGC...3-5 4. CHARTS AND DIAGRAMS SCHEMATIC DIAGRAM NOTES...4-1 CIRCUIT BOARD NOTES...4-2 4.1 BOARD INTERCONNECTIONS...4-3 4.2 VIDEO BLOCK DIAGRAM...4-5 4.3 SYSCON/SERVO BLOCK DIAGRAM...4-7 4.4 Tuner CHEMATIC DIAGRAM...4-9 4.5 AUDIO SCHEMATIC DIAGRAM...4-11 4.6 VIDEO SCHEMATIC DIAGRAM...4-13 4.7 SERVO SCHEMATIC DIAGRAM...4-15 4.8 SYSTEM CONTROL SCHEMATIC DIAGRAM...4-17 4.9 SWITCHING REGULATOR SCHEMATIC DIAGRAM... 4-19 4.10 MAIN AND A/C HEAD CIRCUIT BOARDS...4-21 4.11 TERMINAL & MAIN(TERMINAL)SCHEMATIC DIAGRAMS...4-25 4.12 TERMINAL CIRCUIT BOARD...4-27 4.13 DISPLAY/SW & SW/JACK SCHEMATIC DIAGRAMS (for HR-J425E 4-29 4.14 DISPLAY/SW.SW/JACKREC SAFETY AND CASSETTE SW CIRCUIT BOARDS (for HR-J425E 4-31 4.15 DISPLAY & SW/JACK SCHEMATIC DIAGRAMS(for HR-J425EG 4-33 4.16 DISPLAY,SW/JACK FEC SAFETY AND CASSETTE SW CIRCUrT BOARDS(for HR-J425EG 4-35 4.17 PRE/REC SCHEMATIC DIAGRAM ...4-37 4.18 PRE/REC CIRCUIT BOARD...4-39 4.19 VPS SCHEMATIC DIAGRAM...4-41 4.20 REMOTE CONTROL SCHEMATIC DIAGRAM... 4-42 5. PARTS LIST 5.1 PACKING AND ACCESSORY <M1>...5-1 5.2 CABINET AND CHASSIS ASSEMBLY <M2>...5-2 5.3 MECHANISM ASSEMBLY <M4>...5-4 5.4 ELECTRICAL PARTS LIST...5-6 MAIN BOARD ASSEMBLY <03>...5-6 TERMINAL BOARD ASSEMBLY <06>...5-11 AUDIO/CONTROL HEAD ASSEMBLY <12>... 5-11 DISPLAY BOARD ASSEMBLY <28>...5-11 REC SAFETY BOARD ASSEMBLY <32>... 5-12 CASS SW BOARD ASSEMBLY <33>... 5-12 SWITCH/JACK BOARD ASSEMBLY <36>... 5-12 PRE/REC AMP BOARD ASSEMBLY <43>...5-13 6 TECHNICAL INFORMATION 6.1 SYSCON CIRCUIT... 6-1