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Technical Service Guide
VCR MECHANISM UNIT
(FM-MECHA)
CONTENTS
1. DESCRIPTION OF THE MECHANISM
1. CHARACTERSTIC OF THE FM-DECK MECHANISM........................................................................................................2
2. DESCRIPTION OF THE MODE ............................................................................................................................................3
3. FM DECK TIMING CHART.................................................................................................................................................12
4. WIRING DIAGRAM .............................................................................................................................................................13

2. ARRANGEMENT AND CHECK FOR THE MAJOR PARTS
1. PARTS LOCATION .............................................................................................................................................................15
2. PERIODIC MAINTENANCE AND SERVICE SCHEDULE .................................................................................................18
3. JIGS AND TOOLS...............................................................................................................................................................20

3. DISASSEMBLY AND EXCHANGE
1. MECHANICAL CHECKS ....................................................................................................................................................22
2. REPLACEMENT OF THE DRUM TOTAL ASS'Y...............................................................................................................23
3. REPLACEMENT OF THE S, T SLANT POLE ASS'Y.........................................................................................................24
4. REPLACEMENT OF THE PINCH LEVER TOTAL ASS'Y..................................................................................................25
5. REPLACEMENT OF THE A/C HEAD TOTAL ASS'Y.........................................................................................................25
6. REPLACEMENT OF THE L/C BRKT ASS'Y......................................................................................................................26
7. REPLACEMENT OF THE MAIN PLATE.............................................................................................................................27
8. REPLACEMENT OF THE CAM GEAR, RELAY PLATE, F/L RACK..................................................................................28
9. REPLACEMENT OF THE TENSION LEVER ASS'Y ..........................................................................................................29
10. REPLACEMENT OF THE CAPSTAN MOTOR ................................................................................................................30

4. MECHANICAL ADJUSTMENT
1. CHECK FOR THE MECHANICAL POSITION....................................................................................................................31
2. HOW TO SET MECHANICAL MODE.................................................................................................................................34
3. MEASUREMENT OF PRESSING FORCE FOR PINCH ROLLER ....................................................................................34
4. ADJUSTMENT OF TENSION POLE POSITION................................................................................................................35
5. MEASUREMENT OF THE BACK TENTION ......................................................................................................................35

5. THE ADJUSTMENT OF THE TAPE TRANSPORTING SYSTEM
1. THE SCHEMATIC DIAGRAM OF TAPE TRANSPORTING SYSTEM ..............................................................................36
2. ADJUSTMENT FLOW.........................................................................................................................................................37
3. ADJUSTMENT PROCEDURES..........................................................................................................................................38

6. EXPLODED VIEW & PARTS LIST
1. EXPLODED VIEW OF DECK ASS'Y ..................................................................................................................................45
2. PARTS LIST OF DECK ASS'Y ...........................................................................................................................................46
3. EXPLODED VIEW OF F/L ASS'Y .......................................................................................................................................48
4. PARTS LIST OF F/L ASS'Y ................................................................................................................................................49
5. MAIN SPARE PARTS LIST OF DECK ASS'Y....................................................................................................................50
SERVICE NOTICE ...................................................................................................................................................................52

1
1. DESCRIPTION OF THE MECHANISM
1. CHARACTERISTIC OF THE FM-DECK MECHANISM
1) FM-MECHA DECK follows the VHS standard and PAL standard.
2) FM-MECHA DECK has 3 motors (DRUM MOTOR, CAPSTAN MOTOR and L/C MOTOR).
3) FM-MECHA DECK uses L/C MOTOR to drive FRONT LOADING.
4) FM-MECHA DECK has 7 MODES (EJECT/INITIAL/IDLE/REV/SLOW/PLAY/FF & REW) and each mode is composed of
4 bit mode Signals and realized by the mode switch which is driven by the L/C MOTOR.
5) FM-MECHA uses the FULL LOADING system in which mode shifting time (especially, picture appearing time) is short.
6) FM-MECHA DECK is removed the DECK PCB and connected to MAIN PCB by using the B to B TYPE CONNECTOR.

2
2. DESCRIPTION OF THE MODE
1) EJECT MODE

A. In this mode, the cassette In/Out operation is performed by the CW/CCW rotation of the L/C motor to which the Front
Loading driving parts are directly related.