Akai M-9 - Recording problems (Unit plays back pre-recorded tapes okay, but recording not satisfactory)

2. Recording problems
(Unit plays back pre-recorded tapes okay, but recording not satisfactory)
No recording possible VU meter does not indicate
VU meter itself or lead wire defective /__ | Freeniace |
Defective Input jack
Replace
REC/PLAY slide switch does [ Check record lever oo
not function properly actuates slide switch
Transistor (TR-101) defective |}—_————____— Replace_]
Bias head does not move
Loose connection of P702 and J502 |_| adjust _|
Components of oscillator circuit or oscillator coil defective |
Faulty recording bias circuit Check recording bias voltage and
components of oscillator circuit
Faulty recording equalization circuit Check transistor (TR101)
and L-101 (peaking coil)
Dirty head surface
Over recording input level | Turn the volume down a little
VU-meter lost sensitivity
VU meter indication is normal
Sound distorted
VU-meter functions normally; recording
monitor through external earphone also
normal.
VU-meter functions normally but recording
monitor through earphone abnormal
Replace
Defective input equipment (microphone, etc.)
Faulty erasing Erase head defective’ Replace
Disconnected wire of erase head. Excessive amount Adjust
of dust adhering to surface of erase head
Erasing bias voltage low Transistors (TR-401, 402) defective
Oscillator coil defective
i
Erase head coil defective
Erasing noise (poping noise) Defective recording tape
Transistors (TR-401, 402) defective
Head magnetized
Bias voltage out of adjustment
Demagnetize head
Recording
sensitivity
low
VU
meter
functions
normally
Dirty
head
surface
Clean
Bias voltage out of adjustment Re-adjustment
7
Transistor (TR-101) defective Replace
Tape itself defective Replace
VU meter does not indicate properly Loose connection of the Input jack Adjust
VU meter sensitivity low Replace
__REC/PLAY slide switch does not function properly [——————-—|_ Adjust |_
Difference sensitivity of the line volume itself L— Replace |
Adjust VR-3 (2K-B)
Sound fades or drops out
Replace recording tape
Adjust the tension of supply spindle
Re-adjustment
Much difference recording
levels between left and right
Recording level out of adjustment