Akai 1730-SS - Troubleshooting Chart; Lubrication

Trouble
Symptom
Considerable difference between left and 1. Playback level out of adjustment
right levels during playback
2. Recording Problems (Unit plays back pre-recorded tapes satisfactorily but recording unsatisfactory).
Symptom Trouble
Does not record (4 ch or 2 ch)
(No VU meter indication) 1. VU meter itself or lead wire defective
2. Defective input jack
3. Transistor TR—101 defective
4. IC—101 (LD—3141) defective
(VU meter indication normal) 1. Rec/play chenge switch (SW 10) defective
2. Components of oscillator circuit or oscillator coil defective
Recording head defective
Sound distorted
(VU meters function normally. Recording 1. Faulty recording bias circuit
monitor through headphones also normal). 2. Fautly recording equalization circuit
Dirty head
(VU meter function normally, 1. Over-recording input
but recording monitor through headphones 2. Defective input equipment
abnormal) 3. Check recording amp card (LF—5023)
Fautly erasing (4 ch or 2 ch)
(Does not erase at all) 1. Erase head defective
2. Disconnected erase head wire. Excessive amount of dust adhering
to head surface
(Incomplete erasure) 1. Erasing bias voltage low
(TR-—501, 502 ; oscillator coil or Erase Head defective)
Erasing noise
(Popping noise) 1. Defective recording tape
2. Transistor TR-501, 502 defective
3. Head magnetized
Recording sensitivity low
(VU meter functions normally) 1. Dirty head
2. Bias voltage out of adjustment
3. Transistor TR—501, 502 defective
4. Tape itself defective
(UV meter does not indicater properly) 1. Loose input jack connection
2. VU meter sensitivity low
3. Recording level out of adjustment
Sound fades or drops out . Dust adhering to the head surface
. Tape itself dirty
Back tension too weak
Recording bias voltage too low
nA PWN . Head worn
_
Considerable difference between left and . Large deviation from line VR (RV1 ~4) curve
Tight levels when recording 2. Recording level out of adjustment
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