CHAPTER 1 GENERALCONTENTS INFORMATION SPECIFICATIONS.......................................................... COMPARISON OF FEATURES.................................... COMPARISON OF MAIN CONTROL IC s.....................TIPS FOR SERVICING...................................................TROUBLE DISPLAY FUNCTION ..................................How to Remove the Cassette when a Malfunction Has Occurred in the M echanism ............... SERVICE MANUAL ABBREVIATION L IS T .................. LEADLESS (CHIP) COMPONENT IDENTIFICATION..Instructions on Use and Description of New Functions . 1-1 . 1-2 . 1-4 . 1-5 .1-5 . 1-6 1-7 , 1-9 . 1-12 CHAPTER 2 DISASSEMBLY - VT- F55XE/F640E/F645E/F650E - 1.Before Starting Disassembly...................................... 2.Disassembly M ethod................................................... Parts Hierarchy Chart.................................................... Disassembly Procedure Diagrams............................... 2-1 .Top cover, front panel, rear panel, RJK board and US-FL m echanism .......................................... 2-2.Cassette door and buttons.................................... 2-3.SHU or LED board..................................................2-4. Front frame and LCD board.................................. 2-5.US mechanism/MAS board assembly and N&A board........................................................ 2-6.Separation of MAS board from US mechanism ....2-7.Procedure to remove only the US m echanism ....- VT-F660E - 1. Before Starting Disassembly.......................................2.Disassembly M ethod....................................................Parts Hierarchy Chart.....................................................Disassembly Procedure Diagrams................................ 2-1 .Top cover, front panel, rear panel, bottom cover, RJK board and US-FL m echanism .......................2-2.Cassette door and buttons..................................... 2-3.Front frame, LCJ and F S T .....................................2-4. N&A b o a rd ...............................................................2-5.US mechanism/MAS board assem bly..................2-6.Separation of MAS board from US mechanism .... 2-7.Procedure to remove only the US m echanism ....... 2- Cautions When Reinstalling the US M echanism .............2- CHAPTER 3 ELECTRIC CICUIT ADJUSTMENT AND TROUBLE DISPLAY Service Position.................................................................. 3-1 -VT-F55XE/F640E/F645E/F650E- 1.Servicing position during electrical adjustm ent............3-1 2.Servicing positions when repairing and checking circuits..............................................................3-1 3. Be careful of electric sh o cks..........................................3-1 Service Position.................................................................. 3-2 - VT-F660E - 1.Servicing position during electrical adjustm ent............3-2 2.Servicing positions when repairing and checking circuits..............................................................3-2 3. Be careful of electric sh o cks...........................................3-2 Electrical Circuit A djustm ent.............................................. 3-3 1.Test equipment/jigs necessary for adjustment.............3-3 2.Cautions on adjustm ent................................................. 3-3 3.Tips.for adjustm ent........................................................ 3-3 4.Connections of test equipm ent..................................... 3-3 Test Points and Adjustment p o in ts ................................... 3-4 5.Servo Circuit Adjustments..............................................3-5 5-1 .Switching point adjustm ent....................................... 3-5 5-2.X-value adjustm ent.................................................... 3-5 5-3.Vertical jitter adjustm ent............................................3-6 5-4.Forward slow tracking preset adjustm ent................3-6 5-5.Reverse slow tracking preset adjustm ent................ 3-6 6.Audio Circuit Adjustment................................................3-7 6-1..Hi-Fi audio playback level c h e c k ..............................3-7 6-2.E-E audio level c h e c k ................................................ 3-7 List of Data in EEPROM and Initial Settings.................... 3-8 List of Hidden Commands.................................................. 3-8 1.Mode setting commands during adjustm ent................3-8 2.EEPROM initialization com m ands................................ 3-8 Initial settings of IC903(EEPROM).................................... 3-9 Caution When Replacing IC9()3(EEPROM)..................... 3-9 TROUBLE DISPLAY FUNCTION..................................... 3-10 Troubleshooting According to Malfunction Display..........3-11 CHAPTER 4 EXPLODED VIEWS ] 1.CABINET SE :CTION...........................................................4-1 2.US-MECHAhJISM (TOP VIEW) SECTION...................... 4-3 3.US-MECHAr> JISM (BOTTOM VIEW) SECTION..............4-4 4.US-FL MECh HANISM SECTION....................................... 4-5 CHAPTER 5 REPLACEMENT PARTS LIST ] 1.MECHANISN/I PARTS LIST............................................... 5-1 2.ELECTRICA L PARTS L IS T ..............................................5-2 CHAPTER 6 SCHEMATIC, CIRCUIT BOARD AND BLOCK DIAGRAMS AND MICROPROCESSOR PIN FUNCTION TABLES INTERNAL WIRING DIAG RAM ...........................................6-1 CONNECTION DIAGRAM ................................................... 6-2 CIRCUIT SCHEMATIC B0ARD DIAGRAM DIAGRAM LCD DISPLAY (LCD) [FOR F55XE/F64XE/F650E]..................................... 6-4 / 6-39 SHUTTLE SWITCH (SHU) [FOR F55XE/F650E].................................................. 6-5 / 6-38 LCJ/JACK (LCJ) [FOR F660E] ................................... 6-6 / 6-40 FRONT SHUTTLE (FST) [FOR F660E]..................... 6-7 / 6-41 CYLINDER MOTOR..................................................... 6 -8 / - CAPSTAN MOTOR...................................................... 6 -8 / - MECHANISM SENSOR (M AS)................................... 6-9 / 6-28 LED (LED) [FOR F645E] ...........................................6-10 / 6-39 MAIN CONTROL (MAS) ............................................6-10 / 6-28 JACK (M AS)................................................................6 -1 2/6 -28 SWITCHING REGULATOR(MAS)............................6 -1 6/6 -28 PRE AMP/FM A U D IO (M A S ).................................... 6-18 / 6-28 Y/CHROMA, LINEAR AUDIO (M A S )....................... 6-20 / 6-28 A2 (N&A) [FOR V P S ]................................................. 6-23 / 6-36 NICAM & A2 (N&A) [EXCPET FOR V P S ]................6-24 / 6-36 REAR JACK (RJK)..................................................... 6-26 / 6-36 WAVEFORMS SERVO WAVEFORMS.......................................................... 6-9 Y/CHROMA W AVEFORMS................................................. 6-22 BLOCK DIAGRAMS MAIN CONTROL................................................................... 6-42 SERVO................................................................................... 6-44 VID E O .................................................................................... 6-46 AUDIO .................................................................................... 6-48 POWER.................................................................................. 6-50 MICROPROCESSOR PIN FUNCTION TABLES................. 6-52