Akai X 1810 Service Manual

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Akai X 1810 Service Manual

Extracted text from Akai X 1810 Service Manual (Ocr-read)


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TABLE OF CONTENTS

SPECIFICATIONS ............................. 2
MEASURING METHOD ........................ 3
CONTROL LOCATIONS ........................ 5
DISMANTLING OF TAPE TRANSPORT UNIT &

AMPLIFIERS ................................. 6
TRANSPORT MECHANISM ...................... 8
MECHANISM ADJUSTMENT ..................... 15
AMPLIFIER ADJUSTMENT ...................... 20
MAINTENANCE PROCEDURES .................. 22
COMPOSITE VIEWS OF COMPONENTS ............ 23
TROUBLE SHOOTING CHART ................... 30

SCHEMATIC DIAGRAM

When placing order for parts, please use Separate
PARTS LIST or PRICE LIST FOR PARTS.

Page 33

SECTION “B” TROUBLE WITH AMPLIFIER
1. Playback Mode

a) Reel

Symptom Trouble

No sound from Line Out Jack.
(No B + voltage supply) 1. 03 (loDC-1 BLK), defective.
2. R2 SW 18 n open circuit.

3. TR-l (25D 223 (Y)) defective.

(B + voltage supply) J I. Prevamp Card (RC-550)and socket loose connection.
2. P10“ loose connection.
3. Check transistors 'l‘Rl-t to TRl-4.

No sound from Speaker Out Jack (LINE OUT

0.x.)

(No B + voltage Supply) 1. D1, D2 defective. .
2. R5, or R6 82 (I open circuit. ‘L

(B + voltage supply) 1. Check Transistor TR3-l , 3-2 TRo-l, TR072.

Sound is emitted, but volume insufficient.

(B + voltage supply) 1. Check voltage of power source circuit (LF-5026)

(B + voltage normal) 1. Dirty head surface.
2. Check voltage of pre-amp and main amp circuit.

Loud hum
(Hum decreases if playback head is grounded) 1. Playback head shield or insulation defective.
(No change even it playback head is grannded) L Ground wire loose.
2. C1, C2 (220/ 50 ) C4 (2200/35) defective.
(Inductive pick up) 1. Ground the recorder.
2. Change the set position of the recorder.
Irregular scratching or crackling noise I. Pre-amp Card, and socket loose connection.
2. Check transistors TRl»l to T1114, TR.3»1 and 3-2. Tko-l and TRO»2.
Squeaking Noise 1, Dirty head surface.

2. Tape itself squeaks.

Hissing noise
(Noise present when playing tape) 1. Head is magnetized.
2. Tape itself noisy.

(Not caused by tape) 1. Check Transistor TRl-l to IA, TR3-l and 3-2, TRD-l and TRO-2.
Lack of Treble 1. Poor Contact between head and tape.

2. Head angle incorrect.

3. Head worn out.

4. Tape itself defective.
SOUnd Distorted. 1. Dirty head surface.

2. Defective transistors.

3. Head worn out.

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