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CHAPTER 1 GENERAL INFORMATION J SPECIFICATIONS ... 1-1 COMPARISON OF FEATURES ... 1-2 COMPARISON OF MAIN CONTROL ICs ... 1-3 TIPS FOR SERVICING ... 1-4 TROUBLE DISPLAY FUNCTION ... 1-4 How to Remove the Cassette when a Malfunction Has Occurred in the Mechanism ... 1-5 Instructions on Use and Description of New Functions ■ 1-6 CHAPTER 2 DISASSEMBLY - VT-FX75xE/FX76xE/MX730E - 1.Before Starting Disassembly ... 2.Disassembly M ethod ... Parts Hierarchy C hart ... Disassembly Procedure Diagrams ... 2-1 .Top cover, front panel, rear panel, RJK board and US-FL mechanism ... 2-2.Cassette door and buttons ... 2-3.STL or LED board ... 2-4.Front frame and LCD board ... 2-5.US mechamsm/MAS board assembly and N&A or A2 board ... 2-6.Separation of MAS board from US mechanism ■■■ 2-7.Procedure to remove only the US mechanism ■■■■ - VT-FX770E - 1.Before Starting Disassembly ... 2.Disassembly M ethod ... Parts Hierarchy C hart ... Disassembly Procedure Diagrams ... 2-1 .Top cover, front panel, rear panel, bottom cover, RJK board and US-FL mechanism ... 2-2.Cassette door and buttons ... 2-3.Front frame, LCJ and FST board ... 2-4.NCM and N&A board ... 2-5.US mechanism/MAS board assembly ... 2-6.Separation of MAS board from US mechanism ■■■■ 2-7.Procedure to remove only the US mechanism ... Cautions When Reinstalling the US Mechanism ... ■ • ■ ■ 2-1 2-1 2-1 2-2 ■ ■ ■■2-2 2-2 2-3 2-3 • 2-3 ■ 2-4 2-4 2-5 2-5 2-5 2-6 2-6 2-6 2-7 2-7 2-7 2-8 2-8 2-9 ELECTRIC CICUIT ADJUSTMENT AND CHAPTER 3 TROUBLE DISPLAY ________ Service Position ... 3-1 - VT-FX75xE/FX76xE/MX730E - 1.Servicing position during electrical adjustment ... 3-1 2.Servicing positions when repairing and checking circuits ... 3-1 3.Be careful of electric shocks ... 3-1 Service Position ... 3-2 - VT-FX770E - 1.Servicing position during electrical adjustment ... 3-2 2.Servicing positions when repairing and checking circuits ... 3-2 3.Be careful of electric shocks ... 3-2 Electrical Circuit Adjustment ... 3-3 1.Test equipment/jigs necessary for adjustment ... 3-3 2.Cautions on adjustment ... 3-3 3.Tips.for adjustment ... 3-3 4.Connections of test equipment ... 3-3 5.Test.Points and Adjustment points ... 3-4 6.Servo Circuit Adjustments ... 3-5 6-1.Switching point adjustment ... 3-5 6-2.X-value adjustment ... 3-5 6-3.Vertical jitter adjustment ... 3-6 6-4.Forward slow tracking preset adjustment ... 3-6 6-5.Reverse slow tracking preset adjustment ... 3-6 7.Audio Circuit Adjustment ... 3-7 7-1.Hi-Fi.audio playback level check ... 3-7 7-2.E-E audio level check ... 3-7 8.Cylinder Rotation Accumulated Hours of Usage Display ... 3-7 9.List.of Data in EEPROM and Initial Settings ... 3-8 10.List of Hidden Commands ... 3-8 10-1 .Mode setting commands during adjustment ... 3-8 10-2.EEPROM initialization commands ... 3-8 H.Coution When Handling IC4302 (NAVI EEPROM)-- 3-8 12.Initial settings of IC903(EEPROM) ... 3-9 13.Caution When Replacing IC903(EEPROM) ... 3-9 TROUBLE DISPLAY FUNCTION ... 3-10 Troubleshooting According to Malfunction Display ... 3-11 CHAPTER 4 EXPLODED VIEWS ] 1.CABINETS ECTION ... 4-1 2.US-MECHA NISM (TOP VIEW) SECTION ... 4-3 3.US-MECHA NISM (BOTTOM VIEW) SECTION ... 4-4 4.US-FL MEC HANISM SECTION ... 4-5 CHAPTER 5 REPLACEMENT PARTS LIST ] 1.MECHANIS M PARTS L IS T ... 5-1 2.ELECTRICS L PARTS LIS T ... 5-2 CHAPTER 6 SCHEMATIC, CIRCUIT BOARD AND BLOCK DIAGRAMS AND MICROPROCESSOR PIN FUNCTION TABLES INTERNAL WIRING DIAGRAM ... 6-1 CONNECTION DIAGRAM ... 6-2 LCD DISPLAY (LCD) [EXCEPT FOR FX770E] ... c M /lfo 47 SHUTTLE SWITCH (STL) SCHEMATIC B0ARD [FOR FX750E(UKN)/FX760E] ... — ... ^ A p / ^ 8 LCD/JACK (LCJ) [FOR FX770E] ... 6-5 / 6-49 FRONT SHUTTLE (FST) [FOR FX770E] ... 6-6 / 6-49 CYLINDER MOTOR ... 6-7/ - CAPSTAN MOTOR ... 6-7/ - MAIN1 (MAS) ... 6-9/6-2 LED (LED) [FOR FX765E] ... 6-10 / 6-48 MAIN2 (MAS) ... 6-12/6-27 REAR JACK (RJK) ... 6-15/ 6-45 NICAM (N&A) [EXCEPT FOR VPS] ... 6-17/ 6-45 A2 (A2) [FOR V PS] ... 6-18/ 6-47 TAPE NAVIGATION ... 6-19 / 6-23 WAVEFORMS SERVO WAVEFORMS ... 6-8 Y/CHROMA WAVEFORMS ... 6-8 BLOCK DIAGRAMS MAIN CONTROL ... 6-51 SERVO ... 6-53 VIDEO ... 6-55 POWER SUPPLY ... 6-57 AUDIO ... 6-59 MICROPROCESSOR PIN FUNCTION TABLES ... 6-6