Table Of Contents - JVC HR-A60Uc Service Manual

Section
Important Safety Precautions
INSTRUCTIONS
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF MECHANICAL PARTS AND P.C.BOARDS ............... 1-1
1-1 TOP CABINET AND FRONT CABINET ............................ 1-1
1-2 FLAP .................................................................................. 1-1
1-3 DECK CHASSIS ................................................................ 1-1
1-4 SYSCON PCB ................................................................... 1-1
2. REMOVAL OF VCR DECK PARTS ......................................... 1-2
2-1 TOP BRACKET .................................................................. 1-2
2-2 CASSETTE HOLDER ASS'Y ............................................. 1-2
2-3 CASSETTE SIDE L/R ........................................................ 1-2
2-4 LINK UNIT ......................................................................... 1-2
2-5 LINK LEVER / FLAP LEVER / SENSOR COVER R .......... 1-2
2-6 LOADING MOTOR / WORM .............................................. 1-3
2-7 TENSION ASS'Y ................................................................ 1-3
2-8 T BRAKE ARM / T BRAKE BAND ...................................... 1-4
2-9 S REEL / T REEL / IDLER ARM ASS'Y / IDLER GEAR .............. 1-4
2-10 CASSETTE OPENER / PINCH ROLLER BLOCK / P5 ARM ASS'Y ............. 1-5
2-11 A/C HEAD ........................................................................ 1-5
2-12 FE HEAD ......................................................................... 1-5
2-13 CYLINDER UNIT ASS'Y .................................................. 1-5
2-14 CAPSTAN DD UNIT ......................................................... 1-6
2-15 MAIN CAM / PINCH ROLLER CAM / JOINT GEAR ............ 1-6
2-16 LOADING GEAR S/T UNIT .............................................. 1-6
2-17 CLUTCH ASS'Y / RING SPRING / CLUTCH LEVER / CLUTCH GEAR ............... 1-7
2-18 CASSETTE GUIDE POST / INCLINED BASE S/T UNIT / P4 CAP.............. 1-7
KEY TO ABBREVIATIONS ........................................................ 1-8
PREVENTIVE CHECKS AND SERVICE INTERVALS ............. 1-10
CLEANING ............................................................................... 1-10
SERVICE MODE LIST .............................................................. 1-11
WHEN "N" IS ALWAYS BEING DISPLAYED ON THE TV MONITOR .. 1-11
SERVICING FIXTURES AND TOOLS ...................................... 1-11
MECHANISM ADJUSTMENT PARTS LOCATION GUIDE ............ 1-11
MECHANICAL ADJUSTMENT ................................................ 1-12
TAPE REMOVAL METHOD AT NO POWER SUPPLY .......... 1-12
1. CONFIRMATION AND ADJUSTMENT ................................. 1-12
1-1 CONFIRMATION AND ADJUSTMENT OF TENSION POST POSITION . 1-12
1-2 CONFIRMATION OF PLAYBACK TORQUE AND
BACK TENSION TORQUE DURING PLAYBACK ........... 1-12
1-3 CONFIRMATION OF VSR TORQUE ............................... 1-12
1-4 CONFIRMATION OF REEL BRAKE TORQUE ................ 1-13
2. CONFIRMATION AND ADJUSTMENT OF TAPE
RUNNING MECHANISM .................................................. 1-13
2-1 GUIDE ROLLER .............................................................. 1-13
2-2 CONFIRMATION AND ADJUSTMENT OF AUDIO/CONTROL HEAD . 1-14
2-3 TAPE RUNNING ADJUSTMENT(X-VALUE ADJUSTMENT) . 1-14
ELECTRICAL ADJUSTMENTS ............................................... 1-15
1. BASIC ADJUSMENT ............................................................ 1-15
1-1 SWITCHING POINT ........................................................ 1-15
ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE ............ 1-15
IC DESCRIPTIONS .................................................................. 1-16
SERVO TIMING CHART .......................................................... 1-19
MECHANISM TIMING CHART ................................................. 1-20

TABLE OF CONTENTS

Title Page Section
TROUBLE SHOOTING GUIDE ................................................ 1-21
POWER DOES NOT TURN ON ............................................ 1-21
POWER SHUTS OFF ............................................................ 1-22
AUDIO SHAKES .................................................................... 1-23
CASSETTE TAPE IS NOT ACCEPTED ................................. 1-24
FF/REW DO NOT WORK ...................................................... 1-25
WHEN INSERTING CASSETTE, IT EJECTS IMMEDIATELY .. 1-25
TAPE LOADING IS OK, BUT UNLOADS IMMEDIATELY ...... 1-26
PLAYBACK PICTURE JITTERS HORIZONTALLY ................ 1-27
PLAYBACK PICTURE SHAKES ............................................ 1-27
AUTO TRACKING DOES NOT OPERATE ............................ 1-28
WHEN PLAYBACK, FAST FORWARD OR REWIND MODE IS ACTIVATED, UNIT STOPS IMMEDIATELY .. 1-28
PLAYBACK PICTURE JITTERS VERTICALLY ..................... 1-29
NO PLAYBACK PICTURE ..................................................... 1-30
NO PICTURE DURING PLAYBACK ...................................... 1-31
NO COLOR DURING SELF RECORDING AND PLAYBACK . 1-31
CYLINDER NOT ROTATING DURING PLAYBACK AND RECORDING .. 1-32
PLAYBACK PICTURE NOISY(EVEN AFTER CLEANING HEADS) . 1-32
NO NORMAL AUDIO ON PLAYBACK ................................... 1-33
CAPSTAN DD MOTOR NOT ROTATING .............................. 1-34
AUDIO CAN NOT BE RECORDED ....................................... 1-35
CASSETTE IN AND DOWN, UNIT HAS NO FUNCTIONS .... 1-36
RECORDING MECHANISM WORKS, BUT NO VIDEO RECORDED FROM INPUT JACK OR TUNER .. 1-37
NO E-E (NO VIDEO FROM TUNER) ..................................... 1-38
NO E-E AUDIO (MONO) ........................................................ 1-39
NO TUNER AUDIO (MONO) .................................................. 1-40
CHARTS AND DIAGRAMS
INTERCONNECTION DIAGRAM ............................................ 2-1
Y/C/AUDIO/CCD/HEAD AMP SCHEMATIC DIAGRAM .......... 2-3
SYSTEM CONTROL/SERVO SCHEMATIC DIAGRAM .......... 2-5
POWER SCHEMATIC DIAGRAM ........................................... 2-7
OPERATION/DISPLAY SCHEMATIC DIAGRAM .................... 2-9
TUNER SCHEMATIC DIAGRAM ........................................... 2-11
Hi-Fi/DEMODULATOR SCHEMATIC DIAGRAM ................... 2-13
PRINTED CIRCUIT BOARDS SYSCON/BOT ....................... 2-15
WAVEFORMS ....................................................................... 2-18
Y/C/AUDIO/CCD/HEAD AMP BLOCK DIAGRAM ................. 2-19
SYSTEM CONTROL/SERVO BLOCK DIAGRAM ................. 2-21
TUNER BLOCK DIAGRAM .................................................... 2-23
HI-FI/DEMODULATOR BLOCK DIAGRAM ........................... 2-25
OPERATION BLOCK DIAGRAM ........................................... 2-27
POWER BLOCK DIAGRAM .................................................. 2-27
PARTS LIST
3.1 PACKING AND ACCESSORY ASSEMBLY<M1> ................ 3-1
3.2 FINAL ASSEMBLY<M2> ...................................................... 3-2
3.3 MECHANISM ASSEMBLY<M4> .......................................... 3-4
3.4 ELECTRICAL PARTS LIST .................................................. 3-7
SYSCON BOARD ASSEMBLY<03> ........................................ 3-7
BOT BOARD ASSEMBLY<07> ............................................... 3-10
REFERENCE
SEMICONDUCTOR BASE CONNECTIONS .......................... 4-1
GENERAL SPECIFICATIONS[HR-A60UC] ............................. 4-2
Title Page