Akai X-1810

er SS
SECTION “B” TROUBLE WITH AMPLIFIER
1. Playback Mode
a) Reel
Symptom Trouble
No sound from Line Out Jack.
(No B + voltage supply) 1. D3 (10DC-1 BLK), defedive.
2. R2 3W 18Q open circuit.
3. TR-1 (2SD 223 (Y)) defective.
(B + voltage supply) ‘ 1, Pre-amp Card (RC-550) and socket loose connection.
P1«»J1 loose connection.
3. Check transistors TR1-1 to TR1-4.
No sound from Speaker Out Jack (LINE OUT
O.K.)
(No B + voltage supply) 1. D1, D2 defective.
2. RS5,or R6 8220 open circuit.
(B + voltage supply) 1. Check Transistor TR3-1, 3-2 TRO-1, TRO-2.
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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.
| TURE EEORRDORe
(No change even if playback head is grounded) 1. Ground wire loose.
2. Cl, 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 1. Pre-amp Card, and socket loose connection.
2. Check transistors TRI-1 to TR1-4, TR3-1 and 3-2, TRO-1 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 TR1-1 to 1-4, TR3-1 and 3-2, TRO-1 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.
Defective transistors.
Head worn out.
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