Akai M-9 - Wow flutter. Irregular tape movement.; Unit does not operate in Fast Forward mode.

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SECTION
"B”
TROUBLES
WITH
TAPE
TRANSPORT
MECHANISM
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Check field coil with tester, and replace motor if coil is broken. |
Broken field coil
Defective motor starting capacitor (C702). Replace C702
Rotor shaft dragging due to lack of oil. |}____- Overhaul motor. Clean and re-lubricate oilite metal. |
Some foreign matter exists between rotor and stator. | —| Check and eliminate foreign matter for free rotation of rotor. |
Replace belt.
Capstan drive belt off of driving position. Place belt in position.
Motor bushing slipping on motor shaft.
Oil attached to motor bushing and/or flywheel. Wipe off oil with cotton swab soaked in alcohol.
Troubles with motor Decreased motor torque |} check motor torque and replace motor
Defective C-702 Replace C-702
Motor bushing slipping on motor shaft. |__| Tighten mounting screw |
Troubles with motor
Capstan dogs not rotate.
Troubles with power transmission Broken capstan drive belt.
mechanism.
Tighten mounting screw.
Capstan rotates in Stop position,
but tape does not advance when
switched to Play position.
Troubles with power transmission €apstan drive belt stretched up. Replace belt
mechanism
Oil attached to motor bushing and/or flywheel. Wipe off oil
Capstan bushing slipping on flywheel shaft. |}. Tighten capstan mounting screw
Excessive tension in Takeup/Supply reel table assembly. Readjust tension
Oil attached to capstan and/or pinch wheel. Wipe off oil
Insufficient pinch wheel pressure. Check and re-adjust pinch whee! pressure
Reel shaft dragging due to lack of oil. Check take-up ree! shaft assembly. |
Take-up idler wheel does not rotate properly. JH check idler wheel. Replace if necessary.
Oil attached to idler wheel and/or roller Wipe off oil.
on take-up reel shaft assembly.
Check idler tension spring. Replace spring if necessary.
Capstan advances tape, but take-up
reel does not take up tape.
Take-up idler wheel does not keep good
contact.
Check lever ‘‘G”
Rotor shaft dragging due to tack of oil. Overhaul motor. Clean and re-lubricate oilite metal
Take-up functions normally, but tape Troubles with motor
speed Jower than regular speed.
——-+_ Defective motar starting capacitor (C-702) +— ==. Replace-C-702- |-.--.. ~ a eee cow
Fluctuation in power supply Check line voltage and cycle. Use voltage regulator if line voltage is lower than standard.
Troubles with power transmission Capstan drive belt stretched up and slipping on motor Replace belt
mechanism. bushing.
Capstan drive belt not in correct driving position. Place belt in position
Oil attached to motor bushing and/or flywheel. Wipe off oil
Decreased motor torque Check motor torque
Wow - flutter. Irregular tape movement. Troubles with motor
Defective motor starting capacitor (C-702) Replace C-702
Troubles with power transmission Take-up, supply reei shaft dragging or excessive tension. Check reel shaft assemblies. Replace reel
mecharism. shaft assembly if tension not adjustable.
Capstan drive belt stretched up and slipping.
Rubber on pinch wheel deteriorated. - Qheck rubber on pinch wheel and replace pinch wheel.
Pinch wheel or tape guide does not rotate smoothly. Check and replace defective part. Clean and re-oil
if it again provides smooth rotation.
Dust on heads
Clean heads
Insufficient pinch wheel pressure. Re-adjust pinch wheel pressure.
Capstan bushing slipping on flywheel shaft. Tighten capstan mounting screw.
Worn-out idler wheel or no oil. Replace worn-out idler. Lubricate oilite metal in center
6 of idler.
r —.
Unit does not operate in Fast Take-up reel shaft does not rotate even Troubles with power Oil attached to take-up idler wheel or motor Wipe off oil.
Forward mode. without placing recording tape on unit. transmission bushing.
mechanism. rT
Loose
motor
bushing.
}———__—___—J
Tighten
motor
bushing
mounting
screw.
Take-up
reel
shaft
assembly
does
nat
function
Check,
clean
and
re-oil
reel
shaft
properly. assembly.
Check lever “G".
Take-up
reel
shaft
does
not
rotate
when
Troubles
with
motor
Decreased
motor
torque.
Check
motor
torque.
Replace
motor
recording
tape
is
placed
on
unit.
:
if
required.
Defective
motor
starting
capacitor
(C-702)
+L
4
Check
and
replace
C-702
Troubles
with
power
Excessive
slippage
of
clutch
meteel
(felt)
Check
take-up
reel
shaft
assembly.
|
transmission
mechanism.
in take-up reel shaft assembly.
Tape guide roller does not rotate smoothly. L— Check guide roller. Re-oil or replace.
Take-reel warped and sticking to deck top panel. | Check and replace reel.