CONCORD 107 - ADJUSTMENTS AND CALIBRATION; Idler Wheel and Tension Settings; Head Alignment and Level Setting; CLEANING AND LUBRICATION

ldler
Wheel
(
33)
When
the idler wheel
(33)
is
in
the
Rewind
or
Stop
position,
the distance
from
the idler wheel
to the
larger dlameter
of the
motor
pulley
is
5/
32
".
To
obtain this dlstance, adjust
the two
screws on selector
lever
(21).
The tenslon
on
idler spring
(34),
measured
by
a
spring scale connected
to
the
center shaft
of the
idler
wheel
(33),
is
I lb.
+
0.7
oz.
at
3 3/4 ips
and
1 lb.
?
oz.
at 7
l/
2
ips.
ldler
Wheel l42l
t
The
distance
between
idler wheel
(42)
and motor
pulley
fs
3/16" and
between idler wheel
(42)
take-up
reel
hub
is
5/64" when
the
idler
wheel
(a2)
is in its
disengaged
position.
Toobtain these
distances,
adjust
the two screws
on
the fast forward
arm
(45).
The
tension
on
idler
spring
(37),
measured
by
a
sprlng
scale
connected
to the shaft
of the idler
wheel, is
L2.7
oz.
+
0.7
oz.
Record-Playback
Head
l.
Thread
an
alignment
tape
on the
recorder.
2.
Adiust
the mounting
while
playing
back
at any
frequency
above ?000
cps until the maximuln
output
is
obtained.
Record Bias
Set Selector
Srvitch to
Record
position.
Connect
VTVM
across
Record
play
head.
Adjust
Cl3
for
a
meter
reading
between
-44
and
-55
volts.
Record Level
krject
1000 cycle at
.
98
-1.55
miltivolts
to the
Mie. input
jack.
Set
Selector
Switch
to
Record.
Ad-
justR3
until
record
level indicator
shadows
just
close.
A DJ
U
STMENTS
CLEAN
ING
LUBRI
CATION
TROU
BLE
CHART
Record
head
(9),
erase
head
(t2),
pressure
rol-
ler
(6),
tape
guides
(8)
and
(13)
and
capstan
are
sub-
iect
to tape residue as it
passes
these
parts.
Clean
these
parts
with a
soft
cloth and alcohol.
Clean
all
idler wheels
or
any rotating
part
that
contacts
the
idler wheels
with alcohol.
Lubricate the following
parts
as
follows
with
a
good
light weight
oil.
I.
Flywheel
(46)
-
5 drops
every
300 hours
through
hole at
the bottom of
capstan.
2.
Idler
Wheels
(29), (33),
and
(42)
-
2 drops to
shaft and
I drop
to bearlng.
3.
Pressure
Roller
(6)
-
2
drops to shaft
andl drop
to bearing"
4. Rewind
Pulley(30)
-
2
drops
to shaftand
I drop
to bearing.
5.
Reel Hubs
(2'll
-
2
drops
to
shaft
and 2 drops
to
bearing.
6.
Friction
Roller
(59)
-
I
drop
to
bearing.
7.
Selector
Cam
-
I droP to bearing.
Sym
ptom
Cause
Remedy
Capstan does not ro-
tate.
Defective motor
(35).
Capstan idler
wheel
(33),
motor
pulley,
or
flywheel
(46)
oify.
Idler
wheel
tension spring
(34)
defec-
tive.
Idler wheel
(33)
and
fl.ytiheel
(aG)
in-
sufficiently
lubrica'rci cttusing
them
to
bind"
Capstan screw
hr',
Motor
pulley
loosv"
Replace
motor
(35).
fi.|*an with alcohol.
Fi,eplace.
ilIean
the spindle
bearing
and
Lubricate.
Tighten capstan
scre\p.
Tighten set
screw.
l.
2.
3.
t.
2.
3.
4.
5.
6.
5.
fl
Tape
speed too fast.
l.
Pressure roller
tens'nn
spring
defet:'
tive.
13
If
broken, replace.
If insuffi-
cient
tenslon, shorten.
Weak
output; 1.
2.
Misaligned
record-play head
(19).
Loose
pressure pad
retalning
serrrw.
Pressure
pad
worn
and
doesnrt
contact
the
head.
Record-play
head
(9)
defecttve.
Magnetized
record-play head
(9).
l.
See
"Adjustfirenis.
"
2. Align
the
Frc-sure
pad
so
it
is
parallel
with
the
headand
tighten
the
retainlng
screw.
3.
Replace pressure pdd"
4. Replace
record-play head
(9).
5.
Demagnetiz-:,
the head.
3.
4.
5.
PAGE 4