Akai X 360 Service Manual

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Akai X 360 Service Manual

Extracted text from Akai X 360 Service Manual (Ocr-read)


Page 9

V. MAGNETIC HEADS ADJUSTMENT

1. Adjustment of Magnetic Heads

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Fig. 1

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Since adjustment of the Heads critically affects tape
recorder performance, it is essential that Heads be
carefully adjusted with precision measuring equipment
and a suitable recorded tape.

1.] Adjustment of Head Height (See Figlres l and 2)
Whenever replacing the Head Assembly, adjust the
Tape Guides (J) and (K) so that they do not contact
the edge of the tape, then proceed with Head
height adjustment.

1) Playback Head
To adjust, turn Screw (a) (Figure 1) during
“Normal Play” position so that the upper edge
of the upper core of the Playback Head is the
same height as the upper edge of the tape.
Adjust by turning Screw (b) (Figure 1) during
“Reverse Play” position so that the lower edge
of the lower core of the Playback Head is the
same height as the lower edge of the tape.

2) Recording Head
Adjust with Screws (d), (e) and (f) (Figure 1) so
that the upper edge of the upper core is the
same height as the upper edge of the tape.

3) Erasing Head
Adjust Screws (g), (h) and (i) (Figure I) so that

the upper edge of the upper core is 0.125 to
0.15 mmhigher than the upper edge of the tape.
(Precaution)

In adjusting Head Height, make sure that the
front of the Head is at right angles to the
Chassis and that the upper and lower part of
the Head firmly contact the tape.

1.2 Adjustment of Azimuth Alignment

1) Playback Head
Use a Pre-recorded tape (16 KHz, 7—1/2 ips),
and connect ahighly sensitivity V.T.V.M. to the
line output jack. Adjust Screw (C) (Figure 1) so
that line output voltage is maximum

2) Recording Head
Connect an Audio Oscillator to the line input
jack and record 16 KHz Signals at a —10db
recording level and depress the Monitor “TAPE”
Button. Adjust Screw (t) (Figure 1) so that the
indicated V.T.V.M. value applied to the line
output jack is maximum.

3) Erasing Head
Visually check to assure that the centerline of
the Erasing Head, is at right angles to the Head
Chassis.

4) Bias Head
Loosen Screws (m) and (11) (Figure 1), adjust
angulation and clearance of the Bias and
Recording Heads, as subsequently described in
paragraph 2-5 (Adjustment of Recording
Equalization (Balance) Characteristics).

Page 23

NORMAL PLAY

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22

Page 71

REPLACEMENT PARTS TABLE

X~360 PARTS LIST

HEAD BLOCK

CAPSTAN & PINCH WHEEL BLOCK

STABILIZER BLOCK

CYCLE CHANGE BLOCK

MECHANISM CHASSIS

REEL MOTOR & TABLE BLOCK

REVERSE MECHANISM BLOCK

MAIN MOTOR BLOCK

BRAKE BLOCK

RESISTOR BLOCK

RELAY BOARD BLOCK

POWER SOURCE BLOCK

POWER SOURCE PRINTED BOARD

OSCILLATOR BOARD

DM DETECTOR BOARD

PLAYBACK PRE-AMPLIFIER BOARD

RECORDING AMPLIFIER BOARD

MAIN AMPLIFIER BOARD

MONITOR SWITCH BOARD

TRACK SELECTOR BOARD

C.0‘M. DETECTOR BOARD

C.0.M. SET SWITCH BLOCK

C.O.M. MECHANIC BLOCK

SPARK QUENCHER & SWITCH BLOCK

SPEED SELECTOR SWITCH BLOCK

AMPLIFIER CHASSIS BLOCK

CASE & PANEL BLOCK ,

HEADPHONE CONNECTION BOARD
(X-360D only)

CHASSIS PRINTED BOARD

MAIN AMPLIFIER SOCKET BORD

RD-l 50B ............ 32
RD-l 39B ............ 33
RD-2300 ............ 34

RD-2500

RD-524
RD-S 2 6
RD-532

Page 102

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2

SPARK QUENCHER & MICRO SWITCH BLOCK (RD-1508)

MICRO SWITCH BLOCK (RD-15013)

Nomenclature

Spark Quencher and
Micro Switch Assembly
Complete
Micro Switch V-1A44
Actuator for Micro
Switch
Shaft 3 x 55 mm (Micro
Switch Mounting)
Metal Sleeve, Micro
Switch Mounting
6 x 7 mm

SPARK QUENCHER &
Raft No. Part: No‘
RD-ISOB
I RD-ZOI l
_ 2 RD-2012
3 RID-2013
4 R0401“
S RD-2OIS

“E” Ring 1.9 mm

Ref. No.

6

7

ID

Parts No.
RD~201 6

SKSO-l

PSO—I

550-1

RD-2017

Nomenclature

Spurk Quencher Block
(RD-150)
Spark Quencher
Compound
0.1 ,4 + 120 9
Prop (hex) for
Printed Circuit Board
Screw, binding head
3 x 5 mm
Bracket, Micro Switch
Mounting

32