Akai M-9 - SECTION B TROUBLES WITH TAPE TRANSPORT MECHANISM; Unit does not rewind tape.; Capstan rotates in Stop position, but tape does not advance when switched to Play position.; Capstan advances tape, but take-up reel does not take up tape.

SECTION "B” TROUBLES WITH TAPE TRANSPORT MECHANISM
Unit
does
not
rewind
tape.
Supply
(rewind)
reel
shaft
does
not
rotate
Troubles
with
power
trans-
Oil
attached
to
rewind
idler
or
Wipe
off-oil.
even
without
placing
recording
tape
on
unit.
mission
mechanism,
motor
bushing.
Intermediate
idler
(black
bakelite
Check
‘internal
idler.
wheel)
not
working
correctly.
Loose
motor
bushing.
Tighten
motor
bushing
mounting
screw.
Rewind
idler
does
not
rotate
or
not
Check
rewind
idler.
Clean-and
re-oil.
in position.
Supply
reel
shaft
assembly
does
not
Check
supply
reel
shaft
assembly.
rotate
smoothly.
Clean
and
re-oil.
Supply
(rewind)
reel
shaft
does
not
rotate
Troubles
with
motof.
Check
motor
torque.
Replace
motor
when
tape
is
placed
on
unit.
if
not
repairable.
Defective motor starting capacitor Replace C-702
(C-702)
Trouble
with
power
trans-
Excessive
slippage
of
clutch
material
Check
supply
reel
shaft
assembly.
mission
mechanism.
(felt)
in
supply
reel
shaft
assembly.
Tape
guide
roller
does
not
rotate.
Check
guide
roller.
Re-oil
or
replace.
Defective
reel.
Supply
(rewind)
reel
warped
and
Check
and
replace
reel.
;
sticking
to
deck
top
panel.
Disassemble reel shaft assemblies and strengthen back tension. |
Decreased back tension of take-up and supply reel
shaft assemblies.
Loose tape winding after being
placed in Rewind or Fastforward
mode.
Excessive
slippage
of
felt
clutch
material
in
take-up
Readjust
slippage
of
felt
clutch
material.
Replace
defective
reel
and
rewind
reel
shaft
assemblies.
shaft
assembly
if
this
readjustment
is
difficult.
Reels
of
different
size
are
used.
For
example,
5”
reel
Always
use
reels
of
same
size
on
both
sides.
on
take-up
side
and
7”
reel
on
supply
side.
Brake
does
not
function
properly.
Worn-out
brake
shoes.
Check
and
replace
brake
shoes.
Tape spills when stopped from
Rewind or Fast forward mode.
Oil attached to surface of brake shoes. Wipe off oi} with cotton swab soaked in alcohol.
Loose brake shoes. Tighten brake shoes mounting screw.
Brake lever does not function properly. Check and re-adjust brake lever.
~Worn-out and rugged idler wheel. 4 Check idler wheel. | —
Loose motor mounting screw. Tighten mounting screw.
Defective motor starting capacitor (C-702). Replace C-702
Loose oil cover mounting screw. Tighten mounting screw.
Recording tape is being charged with static electricity. |—{ Replace recording tape. |
Excessive heat on head surface after continued operation. |—| Check tape head. |
Use recording tape of good quality.
Broken
plate-shaped
spring
Check
spring.
Broken
eccentric
gear.
(Black
bakelite
gear)
Check
eccentric
gear.
Nail
on
eccentric
gear
broken
off.
Check
nail
on
eccentric
gear.
Holding plate for eccentric gear defective.
Periodical clack noise when re- ~
winding or fast forwarding tape.
Loud motor vibration.
Squeaking noise when playing
tape.
Old and worn-out recording tape.
Inferior recording tape.
Automatic stop lever moves normally.
Automatic stopping device
does not function.
Check if eccentric gear sticking to holding plate.
Check
guide
groove
on
deck
sub-plate
and
mounting
screws.
Check instant stop mechanism.
Defective instant stop lever.
Check mounting screw.
Bent
REC-PLAY
switch
re-setting
lever.
Check
lever.
Automatic
stop
lever
does
not
move
Broken
lever
spring
or
lever
spring
not
in
position.
Check
lever
spring.
or
sticky.
:
Automatic
stop
lever
sticks
to
rear
deck
panel.
Check
rear
side
of
deck
sub-plate.
No
lubricant
on
lever
shaft,
or
dust
on
shaft.
Clean
and
re-lubricate
lever
shaft.
_|
Cycle
change
switch
does
No
lubricant
on
cycle
conversion
lever.
Relubricate
lever.
not
move.
Eccentric
or
bent
cycle
conversion
lever.
Check
cycle
conversion
lever.
Capstan
drive
belt
not
on
driving
track
of
flywheel.
Check
capstan
drive
belt.
|
Loose motor bushing. Tighten mounting screw.
Loose motor mount screw. Tighten mounting screw.
Oil on motor bushing or on flywheel. Wipe off oil with cotton swab soaked in alcohol.