CONCORD 105 - Disassembly; To Remove Recorder from Case; Adjustments; Record-Playback Head

To
Remove
Recorder
from
Case
l.
Remove
all aceesgories
from
the
recorder.
2.
Remove
all control
knobs.
3. Remove
head
cover
(4).
4.
Remove
the four
panel
retaining
screws.
5. Lift
the
panel
(8)
off.
6.
Remove
four
screws
from
bottom of case-
Lift recorder
out of case.
Unplug the speaker
plug
from
the amplifier
chassis,
To
reassemble,
reverse
the foregoing
proced-
ure.
D
I
SASSEMBLY
ADJUSTMENTS
'l
.
8.
9.
Record-Playback
Head
l.
Thread astandard
frequencytape
onthe record-
er'
2.
Adjust
thehead
mounting
screws
forthe angular
position
that
will
give
maximum
output
while
playing
a section
of the
tape with
more
than
?,000
cps.
3. Tighten
the mounting
screws.
Drive
ldler
I.
Fasten
a string
around
the oil cup ofdrive idler
(66).
2. Fasten
aspring
scale
to
the string
and measure
the force
necessary
to
pull
drive idler
(66)
away
from
the motor
pulley (?9)
and flywheel
of
cap-
stan
(95).
CLEAN ING
The record
head,
erase
head,
capstan,
pressure
roller,
and
tape
guides
should
be cleaned
occasionally
to remove
the
tape
residue
which
is worn
off the
tape
as it
passes
these
parts.
Use a
soft
cloth and alcohol
to
remove
the residue.
Clean the rubber
ti.red idler
wheels
and
belts
with
cleaning
fluid.
3. A force
of I I/
4
to L
b/ I
pounds
is required.
4.
To
obtain
this force,
bend
the metal lug
that
drive
idler
tension
spring
(?4)
is fastened
to.
Pressure
Roller
To
vary
the
pressure
of
the
pressure
roller,
pressure
roller
arm tension
spring
will have
to be
adjusted
by varying
the
gap
between
the
coils of the
spring.
The
pressure
shou.Ld
be from
2
5/
B
to I 3/
g
pounds.
Takeup
Torque
The
takeup
torque
is
adjusted
by varying
f riction
spring
(33).
It
should
be adjusted
sothe
upper limitis
between l.
3
-
2.
I
oz. inches.
LUBRICATION
AII
rotating parts
areprovided
wi.th
oilite
bear-
ings
and are lubricated
before
leaving
the
factory.
Under
normal
use,
no lubrication
is
required
for a
long
period
of time.
When lubrlcation
is
necessary,
use sewing machine
oil sparingly.
When lubricating
the
flywheel, remove
the cap-
stan screw
and inject 4
or
5
drops
of sewing
oil.
TROUBLE
CHART
Symptom
Ca
use
Remedy
Weak
output.
l.
2.
3.
Record-playback
head
(f07)
not
properly
aligned.
Pressure
pad (126)
not
contact-
ing
the head
properly.
Record-playback
head
(10?)
de-
fective.
l.
See
"Head
Adjustment".
2. U
pressure
padis
worn, replace.
If spring
(125)
is
broken, re-
place.
3.
Replace.
No
takeup reel
drive
in"Re-
cord"
or
"Play"
position.
Iy.
Takeup
drive
belt
(35)
broken.
Brake
assembly
(aa)
does
not
open.
Coupling
between
takeup
drive
puuey
(34)
and
takeup
hub
(30)
too loose.
Takeup hub
(30)
or
takeup drive
pulley (34)
does
not rotate
free-
I.
Replace.
2.
Adjustorreplace
brakeassembly
(44).
3. Adjust
friction disc
(32).
4. Lubricate
with sewing
machine
oil.
1.
2.
3.
4.
Page
4