Akai GX 650 D Schematic

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Akai GX 650 D Schematic

Extracted text from Akai GX 650 D Schematic (Ocr-read)


Page 2

STEREO TAPE DECK

MODEL G X _650 D

SECTION 1 SERVICE MANUAL ......................... 1
SECTION 2 PARTS LIST .............................. 27
SECTION 3 SCHEMATIC DIAGRAM ....................... 48

SECTION 1

SERVICE MANUAL

TAB LE OF CONTENTS


I. TECHNICAL DATA ....................................................... 2
II. DISMANTLING 0F UNIT ................................................. 3
III. ARRANGEMENT 0F PRINCIPAL PARTS ....................................... 4
Iv. MECHANISM ADJUSTMENT ................................................. 5
I, CAPSTAN SHAFT LOOSE PLAY ADJUSTMENT ................................ 5
2. BRAKE SOLENOID POSITION ADJUSTMENT .................................. 5
3 BRAKE TENSION ADJUSTMENT ........................................... 6
4. PINCH ROLLER SOLENOID POSITION ADJUSTMENT ............................ 7
5. SHIFTER SOLENOID POSITION ADJUSTMENT ................................ 7
6. PINCH ROLLER PRESSURE ADJUSTMENT ................................... 8
7. REEL TAELE HEIGHT ADJUSTMENT ................ 8
8. TAPE GUIDE HEIGHT ADJUSTMENT . ........ 9
9. TENSION LEVER HEIGHT ADJUSTMENT .................................... 9

10. CONFIRMATION OF POINT AT WHICH LEFT AND RIGHT TENSION
ARMS OPERATE ................................................. 10
11. TENSION ARM RETURN TENSION ADJUSTMENT .............................. II
12. HALL IC(DN835) AND ROTARY MAGNET CLEARANCE ADJUSTMENT . . 11
V, HEAD ADJUSTMENT ...................................................... 12
VI. AMPLIFIER SYSTEM ADJUSTMENT ........................................... 14
1. DC POWER SUPPLY VOLTAGE ADJUSTMENT ................................. l4
2. TAPE SPEED ADJUSTMENT .............................................. 14
VII. DC RESISTANCE OF VARIOUS COILS .......................................... 16
VIII. CLASSIFICATION OF VARIOUS P.C. BOARDS .................................... 17
1. RELATION OF P.C BOARD TITLE AND NUBMER ............................... 17
2. COMPOSITION OF VARIOUS P.C BOARDS .................................... 17

For basic adjustments, measuting methods, and operating principles. refer to GENERAL OPERATING PRINCIPLES AND
ADJUSTMENTS.

Page 7

TENSION LEVER

.-POS|T|ON AT WHICH MICRO

SWITCH IS CUT

MICRO SWITCH

2mm

AFTER BEING CUT THE MICRO

SWITCH OPERATES AT A MINIMUM
OF 2mm BELOW THE CUTTING POINT

6 T0 7qr.
DIAL TENSION GAUGE

Fig. 17

Fig. 18

10. CONFIRMATION OF POINT AT WHICH 11. TENSION ARM RETURN TENSION

LEFT AND RIGHT TENSION ARMS
OPERATE

Confirm that the left and right micro switches ope-
rate at the positions indicated in Fig. 17.

A DJ USTMENT

Bend the oval shaped lug terminal and adjust the
strength of coil spring so that as shown in Fig. 18,
when the tension arm returns in the direction of

the arrow, the tension registered with a tension
gauge is 6 to 7 gr,

10

A-A

I-ll

REEL TABLE

it Imm

-C
- STOP DETECTION RC
BOARD TY-IOO5

«KAI

30g;

Q

>121

©

STOP DETECTION RC
BOARD TY-IOOS

-in

Fig. 19

12. HALL IC (DN835) AND ROTARY

MAGNET CLEARANCE ADJUSTMENT

Adjust the Stop Detection P.C Board in the directions
indicated by the arrow mark so that the gap between
the Hall IC and the rotary magnet is 1 mm as shown

in the Fig.19.

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