Audiomatic A-900 Manuale - Pagina 12
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Stampa la paginaFig.
7.
Top
vieuv
of motor mounting
plate.
ELECTR
I
CAL
A
DJU
STMENTS
Hum
Adjustment
Place
unit
in
PLAY position;
Left
Channel-
VOLUME at maximum
and
Left
Channel-TONE at
full
bass.
Connect
a
VTVM to
the
LEFT
Ext. Spkr. jack.
Setthe
VTVM
to
AC,
3
volt
scale,
with
a 3.3 ohm load
resistor
across
the
meter.
Adjust
hum
control
(R3)
for
mininium deflection
on
meter.
Play-Record
Head
Alignment
1.
Remove
front
escutcheon (11)
and
rear
escutcheon
(6),
2. Clean pole pieces
of
play-record
head (5?)
with
alcohol
or lighter fluid.
3. Thread alignment tape
on recorder. Turn
Left
Channel-VOLtIME
to
ma:rimum,
ild
Left
Channel-
TONE
to
full
treble.
4"
Conneet
a
VT\IM to
LEFT
Ert" Spkr.
iack.
Set
the
meter
to AC,
3
volt
seale,
5. Place reeorder
in PLAY position,
7
t/Z-ineh
per
second
speed.
DeereaseVOLUME
to point
where
out-
put
is
l-volt
on meter.
Turn
play-record
head
ad-
justment
screw
(57,
Fig.
2) until
manimum point of
deflection
on
meter
is
obtained.
TROUBLE CHART
Symptom
Cause
Remedy
Push
buttons
fail
to latch
into position.
1.
Lock plate spring
(80) disconneeted
or
broken.
1o
Connect or
replace
spring
(80).
No
drive
in
Play
or
Re-
cord.
1.
Idlertensionsprings
(138)
disconneeted
or
broken.
2. Idler
slideplate
(124)
bindingon
bushing
(126),
thus prwenting
idler
wheel
(123)
from
moving
forward.
1.
Connect
or
replaee
springs
(138).
2.
Check
slide plate
(124)
andbushing
(126)
for burrs.
Clean
with
alcohol.
Tape
fails
to
wind
on
take-
up
reel
during
Playor
Re-
cord"
1" Reel
drive
spring
{70)
loose,
dismn-
nected,
or
broken.
2.
Reel pan
shaft
(2) binding.
1.
Connect
or
replace
spring
(70).
2.
Clean
foreign
matter
from
bearing
surface
and
shaft
with
a
clean
cloth.
Lubricate with
one
drop
of
#
10
motor
oil.
No
Fast Forward
or
Re-
wind.
1. Idler lever
tension
spring
(9?)
discon-
nected
or
broken,
thereby not
actuating
idler lever
(100).
1.
Connect
or
replace
spring
(97).
t2