Technical information

o
RADIO RETAILING'5
."Se'zuie,
CROSLEY
555
Loss
of
volume
. .
. leaky
condenser
No. 14 in
schematic
connected
between
anode
grid
of converter
and
primary
of oscillator
coils.
CROSLEY 60l. Filanrent rheostat
shaft shorts
to
metal
panel,
heatir-rg wire
and destroying fiber insulation
without
damaging wire
itself. Equip shaft with
insulating
bushing, 6ll
in
between
wire
turns where charred with heat resisting
cement and
pulverized
asbestos,
smear-
ing mixture
on wire to hold it firmly.
When
dry,
scrape fnixture
fronr contact
surface
with knife.
CROSLEY 610
Fading,
hum
. .-
loose rivet on
6lament centertap resistor.
Remove
resistor
and clamp rivet
tighter
in vise.
CROSLEY 6I7
Noisy,
ir.rterurittent
tighten
6A8G socket
clanrps anrl realign
as
sensitivity and selectivity
is
affected
by
vibraticrn of Dyrratrol.
cRosLEY
635
Oscillation or dead . check con-
denser 178 in
schema,tic connected
be-
tween
cathode
and
screen
of. 6A7.
CROSLEY 635
Bad
oscillation frorn 700
kc
to 800
kc,
whistles on other stations
look for leaky
.02 mfd condenser
fronr
screen
to cathode of 6A7.
CROSLEY 644
Dead
except for weak signals
on
high frequency
end .
open 0.1
mfd
condenser
between
anode
grid
of 6A7
and the
band
switch.
CROSLEY 648
Interr-uittent
operatiott
replace
60,000
ohnr
resistor cotrnecte<l
frottt
6A8
oscillator
erid
to
chassis.
CROSLEY 648
Intermittent
.
. ieplace the 60,000
ohm resistor connected
from
the 6,4'8
oscillator
grid
to chassis.
ctosLEY
706
Fuse blorvs
. .
.
replace fiber bushings
on
6eld supply.
Voltage
divider
gets
extremely hot
. . replace .5 nt{d. condenser from
center arm.
Noisy
runing
. bufrs on stator
tuning
plates.
Can be cleaned ofi with
long
shrrp
lcnifc
bladc"
Dial
light flickers, noisy
.
. .
replace
AC.
switch.
Poor
ton€, volume increases when
one output tube is removdil .
.
. Small
wires
on
"F"
type
speaker
unit broken,
CROSLEY
706.
No
plate
voltage
on
r.f.
tubes.
Caused
by shorting of
.5
mfd. condenser.
CROSLEY 706
Intermittent
. . screw
on aerial
terminal works
loose
due to
worn
threads.
Solder
small
length
of
wire
to lug
under screw
and
attach aerial
to
other end of
wire
instead of
to terminal.
CROSLEY 70G60.
Excessive hum
de-
spite ok circuit check.
Replace
27
de-
tector with a 56 and connect l/10 mfd.,
200
volt condenser
from
chassis to detec-
tor heater at
fourth
terminal
from
front
of chassis on brass strip connecting
pack
with
chassis.
cRos[EY
7r5
Intermittent reception. accourpaniecl
b1'
oscillation
if norntal
s'hen
finger
is
placed
on
grid
ca9
of 287 at
lear
of chassis
replace defective 3 sec-
tion
filter
(part
No.
W-36056).
CROSLEY 7I5
Intermittent
reception
accompanied by
oscillation. . . . If
set operates normally
when
finger
is
placed
on
grid
cap of
287
tube at rear
of chassis replace
de-
fective 3
section
6lter
condenser
(part
#360s6).
CROSLEY 8I4
Distortion,
poor
volume and some-
tintes
no signal
. . .
Open
10,000 ohm
candohm
resistor
section.
This is from
screens
to
ground.
cRostEY
1t27.
|17
Poor tuning-ey'e action
remove
cathode lead from
ground (black
wire)
and connect
to
the
lo',ver
end of the
diode
load
resistor.
CROSLEY 156. Failure
to oscillate,
re-
gardless
of volume control
or
regenera-
tion control setting. Remove
regeneration
condenser
and bend
plates
away
from
each other.
cRosLEY'
| 5 r6
Neon tuning
won't
w'ork
oPen
30,000
ohm
resistor
No. 68.
CROSLEY
On some
models
the
bolts that hold
the chassis
to the cabinet
are different
lengths.
Always be careful
to
replace
these bolts exactly as
they
were
origi-
nally. Replacing
a
long bolt
in the
wrong
position
could result
in
a
punc-
tured
filter condenser
or
similar
dam-
age.
CROSLEY
BAND-BOX. Variablec
slip on
their shaft
in this model, making
the set
squeal and
howl. Trouble
is
often
difficult to
find as
condenserl
arc
mounted upside
down.
CROSLEY.
Slipping of diel
on
lower-priccd
models using
frictioa
drive
, . Remove
dial and
notc if tension
spring
is held by washer hcadcd onto
shaft. Knock ofi
washer and
rcmovc
spring
and back
piece
of brass.
Note
whether or not a
shoulder has been
worn in the brass.
If so, file or
gtind
this off,
replace and
rehead
the weshcr
onto the shaft.
If impossible to rchead
push
washer down tight on spring,
hold
and solder.
If it seems impossible to
remove spring and brass
piece
takc
the
friction
part
and
fit a
piecc
of stove
pipe
wire
into the slot into which thc dial
edge
fits. Be sure it is cut in such a
length as
will fit
snugly and
force it in
tightly.
CROSLEY
FMR.
Be sure 6.3
volt
arrd
not 2.5 volt
pilot
is
used as
re-
duction in
heater drain caused
by ule
of snraller bulb
pernrits
voltage to rise
and causes erratic oscillator
operation,
frecuently internrittent
reception.
CROSLEY FIVER
Nois_v
when
jarred
.
irnproper
ground
connections
on
the
tuning con-
denser
rotor.
Ground
u'ith a small
piece
of
flexible
wire.
CROSLEY
MUSICONES
and DYNA-
CONES.
Repair data on types A to
F, inclusive . .
.
If
cone
is
crushed
, . .
Remove
from speaker.
Iron
out with
fairly
hot flatiron,
holding
point
of iron
snugly
in center of
cone. Swing back of
iron
from side to side,
pivoting
on
point.
Iron
out only
a small
portion
at one
time, shifting cone
around.
A large
magazine should
be
ptaced
under the
cone, Do not use
water
to
dampen
as
it m4y cause blisters.
Too hot
an iron
will
burn cone.
Before replacing
unit
always
straighten out the
armature
pin,
put
a drop or two of
oil on the adjusting
screw,
c€nter the adjusting screw ac-
curately. After
replacing
cone
be
sure
that base seats
snugly without having a
tendency
for
"star"
to
crush
into it, or
cause
con€ to bulge. Adjustments . .
Have speaker
playing.
Screw
in until
it
rattles.
Screw
out until it
rattles.
Count
the
number
of turns between these,
two
adjustments and turn the screw
back in
half
that
number
of turns.
This
centers armature.
CROSLEY Roamlo.
New
sets
which
are insensitive except
at
trimming
ad-
justment
points
should be examined
lor
reversal of
first
detector
antenna
and
grid
coils, These are small units of
the
choke
type.
CROSLEY
Totqn
Smoke.
Hcat
from
filament
resistor
melts
filter
con-
denser
compound.
Rc-mount
resistor
and
plate
choke.
Takes.20
minutcs.
19