Philco 706 Service Manual

PHILCO RADIO
SPECIFICATIONS
CABINET
CIRCUIT
FREQUENCY
RANGE
PHONOGRAPH
.
....
.. ..
.Philco
...Model 706 (Wood, Philcote
finish)
Five-tube
superheterodyne
..
540
to
1600 ke.
automatic record
player,
Model
M-Z
PowER
INPUT
............,..
..
.. ...105
to
120
volts-A.c.
onry
POWER
CONSUMPTION
.......
32
watts (exclusive of
phono motor)
ANTENNA
.............
...Built-in
loop
or
external
INTERMEDIATE
FREQUENCY
...460
kc.
PHILCO TUBES
USED
7A8, 7B7,7C6,5OL6GT/G,
5OY6GT/G
PILor LAMP
..110-volt, screw
base,
part No.
B4-2540
list
and
service procedure for
adjusting the M-7
automatic record player
be found
in
Philco
Service Manual
PR-1154.
PHILCO
TROUBLE.SHOOTING PROCEDURE
Modcl
706
NOTE:
The
parts
on rnodel ?06 wtll
lr-0a!
Figure
l.
Block
dicarqm (Heqvy
$nes
indicqte
signcl pothl
r
b
FIr!!. ,.
Bottor
vt w, .horlna
t.!r
Doint..
In this
mrnual, the
receiver
circuit is
divided
into
four
To
localize trouble,
connect the receiver
to the
power
iii'Jtr;,x"..:*3x.,tJt,'.'r*:i:.*
fj,:[#lj*gf.iif,
lLt
:,'lu:",i*:i::
""gt;{*,,'",'_T
ilHfJT*:
cations,
secured when
checkiu
et
inate ifie
seciiJn
uil;'iil.s; i
"iiii""!
fii#i.iii;' ri,iiili:
order given
iD.the
followins chart.
When Cpplying
a
sig_
tion of
the
faulty pari i"."".-piisttea
tv i""ti"s'ilil*
nal'.
connect-
the
signal-generator
output
lead thiough
a
order
shown
in
ihe-
sectionol
tcsl
charts."
A
hi;h--qo.lG condenser (.01
to
.25
mf.)
to the
indicated test
point6;;on-
sigral geherator
and
volt-ohmmeter are requiredl
V'ottagi
nect the 8enerator ground
lead through a
.6
mf.
condenger
readings
shown
were taken
with a 20,00d-ohms-per-voitt to B-.
Remedy
any
defect
encountered before proceeding
d-c
meter.
-
to
the.
next
check.-
NOTE:
To
open
the
cabinet,
re-les-se- the.
catch,
which
is
accessible
through the circulsr
opening
near
the rear
of
the bottom
cover.
.While
ho_ldilrS
the c€tch
u-p,
slide the top
"l"t'io"'oi
tt
e
cdUi"*'iitioiiira
the.
rear.
The
top_-section can
then
be
lifted-iway
from_tii
base board'. Wtren
;e."i"*Uti,iri'tti-"
c"Ui""t-,
make sure
that all
leads are clear of
the phonoiurntable
and pickup.
TESTS TO LOC ALTZE TROUBI-,E TO ONE SECTION
SECT|oN
4
ailttl'ltA.
t.F
.^lro
otctlratot
sEcTtoN I
towtl
SutttY
sEcTtoN
2
st(oNo Dtrlctol.
A,V.C. AND
AUDIO
TEST
POINT SECTION
2
SECTION
TEST
ORMAL
RESUL
I
Measure
voltage
betrveen
point
I
and
B-.
120v*
2
Apply
audio signal through
a
condenser
(.01
to
.25
mf.)
between
point 2
and
B-.
Loud, clear
signal
3
Apply
weak, modqlated signal (460 kc.)
through a
condenser
(.01 to
.25
mf.)
be-
tween
point
3 and B-.
Loud,
elear signal
4
4pplv
weak, modulaled g-ignal (1000
kc.)
_through
a
condenser
(.01
to
.2b mf.)
between
point 4
and
B-.
Rotate tuning
condenser
until
signal
is
heard
in
speakei.
Loud, clear
signal
I
Copyright,
1946,
Phileo
Corporation
{'
For
117-volt, a-c- input