Sony TR-714 User manual

SERVICING GUIDE
TR
-7
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1 4
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···············
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Specifications for TR-714
Circuit 7 transistor superheterodyne
Covering range: M.W. 535~1,605 Kc
IF frequency
Sensitivity
Selectivity
Output power
Current drain
Speaker
Battery
Dimensions
Weight
Color
S.W.
3.9~12 Mc
455 Kc
M.W.
50 pV/m with built-in ferrite bar antenna
Better than 5 µV/m with external aerial (effective heiget 5 m.)
S.W. 60 µV/m with telescopic antenna
Better than 5 pV/m with external aerial (effective heiget 5 m.)
Better than 17 db (±10 Kc off)
50 mW (non distorted)
7 mA±20% at 0 signal
2¼ '' PM dynamic speaker (8 52)
9 Volts BL-006 P, Eveready 216 or equivalent
116x76x33.5mm (4½"x3·
1
xl¼'')
350 gr. (12.5 ozs.)
Cream, Dark green and Dark grey
-1-

Adjustment
Mixer
stage
Operating current
The
current
can
be
known
from
voltage
drop
across
R
3
which
is
normally
0.66~0.77
Volt.
Sinc:e R3
=2.2
KQ,
the
current
will
be
300~350
µA.
Tracking
M.W.
band
i.
Adjust
core
of
L,
to
receive
1,680
Kc
(upper
limit)
with
the
variable
condenser
set
at
minimum.
Then
adjust
trimmer
C,-
,
to
receive
520
Kc
(lower
limit)
with
the
variable
con-
denser
set
at
maximum.
ii.
Adjust
L,
to
get
maximum
output
at
640
Kc.
iii.
Adjust
C,-,
to
get
maximum
output
at
1,400
Kc.
iv. Confirm
that
520
Kc
and
1,680
Kc
can
be
received
at
each
extreme
position
of
the
variable
condenser.
S.W. band
i.
Adjust
L3
to
receive
3.82
Mc
(lower
limit)
with
the
variable
condenser
set
at
maximum
and
adjust
C,-3
to
receive
12.8
Mc
(upper
limit)
with
the
variable
con-
denser
set
at
97°
(counting
from
maximum
position).
ii.
Adjust
L,
to
get
maximum
output
at
3.82
Mc.
iii.
Adjust
C,-,
to
get
maximum
output
at
12.8
Mc.
Helpful informations
1.
In
higher
frequency
range
the
local
oscillator
frequency
varies
when
the
antenna
circuit
is
adjusted.
This
variation
leads
to
misadjustment.
To
get
proper
result
the
following
process
is
recommended.
When
C
1_1
is
adjusted,
change
signal
generator
frequency
slowly
until
peak
output
is
given
by
the
set
under
adjustment.
Then
turn
tuning
knob
of
the
set
to
tune
to
the
new
signal
frequency.
Adjust
again
C,.
1
to
get
peak
output.
Repeat
this
procedure
for
2
or
3
times.
When
proper
adjustment
is
accomplished,
highest
output
will
be given.
Around
12
Mc,
image
frequency
may
come
into
the
adjustable
range
of
the
trimmer.
The
image
frequency
can
be
distinguished
as
follows.
When
the
signal
generator
frequency
is
changed
with
the
tuning
knob
of
the
set
fixed, 2
frequencies
will
be
received.
Among
them,
higher
frequency
gives
image.
2.
When
the
set
is
mounted
in
the
cabinet
after
tracking
adjustment,
alignment
of
RF
section
is
affected
by
grille
plate.
To avoid
this
trouble,
the
tracking
adjustment
must
be
performed
after
the
set
is
mounted
in
the
cabinet.
To take out
the
set
from
the
cabinet
1. Remove
back
cover
of
the
cabinet
and
detach
shielding
plate.
(This
shielding
plate
must
be
attached
without
fail
after
the
set
is
mounted
in
the
cabinet,
because
it
is
important
to
keep
the
set
from
body effect.)
2.
Remove
screws
under
the
ferrite
bar
at
the
right
end
and
on
the
right
side
of
the
cabinet.
-2-

~
)
To
roi
antenna
(SW)
Green
MWAnt
SWO
Ciq)
_C2
L2
MWAnt
•
To
ext
.
antenna
(
MW)
I r
r,__
""
I-
--1
~--__.
(''
~
'-"'
Battery
hoLder
0
J ;
~2~r~~:_
Yell
ow
/
\.
s
C>
N
y-
o::~lac~--
~ ·
i......::::
Bl
=a
c
=k--+--O----U
~
ftn
•
...,
,,...
,,.-,.__
-
Rio
-IC-
' ·"
~
W
hite
@~
J
~ t - ..-
T r
. - - •
v-
,!
.T .
''=--f'
C2-1
C
2-
"'(
ff'
t
MWOSC
/1
I
S.WAA
@
® To
Speaker
VA-VG
ANT
SA-SW
ANT
BA-MW
ANT
VO-VG
OSC
@
~~~~~~g
SOe,;,.
~H
C11
~
[id
To
grownd
~
I
Mounting
diagram
of
TR-714
(Printed
side)

C22,....
C21
X4
.i:,..
7 2~1
~KsR1oiF1\·-Mw
c9
-\onthecircuit
3
OSC•
SW
(}SC
Mounting
of
TR-714
) )
T
0
VO
on
the
circuit
board
C21
T
0
VA
on
the
circuit
board
circuit
b0ard
board

x,
x,
x,
X,,1
Schematic
diagram
of
TR-714
Parts
list
for TR-714
--
Symbol
Description
Symbol
De
s
cription
L,
SW.
Ant.
coil Ria lOK!J 5%
¼W
LA-034-lQ
R"
56
K.!2
II
II
L2
MW.
Ant.
coil R
1,
820.Q
II
II
LA-035-lQ
R1s
820
.Q
II
II
L,
SW.
Oscillator
coil
R1
1 lOKJ'J
II
II
LO-027-AQ
R1
s 56KJ'J
II
II
L,
MW.
Oscillator
coil
R1•
5
.Q
II
II
LO-026-AQ R
,o
680
.Q
II
II
IFT1
LI-021-AR
R2,
220
.Q
II
II
IFT2
LI-021-BR
R
22
5.6K.Q
II
II
IFT
3
LI
-021-CR R
2a
220
.Q
II II
T1
TI-002-04 R
,.
22
.Q
II
I/
T2 TX-002-04 R
,s
22
.Q
II II
SP
2
¼"
8Q
R
21
2.2K.Q
II
II
J
Earphone
jack
C,-1
.
C1
-2
PVC
-
2JT
R1
30K!!
5%
¼W
C
2-
1.
C,.,
Trimmer
condenser
C,.,. C
2-
•
R,
4.2
K!!
"
II
Ca
2pF
(
Styro
l)
Ra
2.2
K!!
" "
c.
0.
05µF
R,
220
Q " " c,
0.
01
µF
R,
CD
100
K!!
"
II
c.
370
pF
(
Styrol
)
Rs
470
Q
II
" C1
2000pF
(
"
)
R1
820
Q "
II
Cs
170pF
(
II
)
Rs
7.5
Kfl
" "
c
•.
1. c•.
,®
20
µF
10
V
Block
R.
22
K!!
" "
C10®
lOµF
3V
Rio
4709
" "
Ca
2
pF
(
Titanium
)
R11®
5
K!!
II
"
C1,
0.01
µF
(
MXL
)
R12
1.2
K!!
II
"
cl3
200
pF
(
Styrol)
CD
To
be
adjusted
when
X,
or
Xa
is
replaced.
®
Volume
control
with
switch.
®
Electrolytic.
-5-
Symbol
Description
c"
0.01
µF
(
MXL
)
C1sCD
2
pF
(
Titanium
)
C1
s®
10µ
3V
C11
200
µF
(
Styro
l)
Cis
0.02
µF
(
MXL
)
C19@
5µF
6V
C,o
0.001
µF
(
MXL
)
C21
®
5µF
6V
C,,@
30µF
3 V
c,
,
0.05
µF
(
MXL
)
C2
, 5
pF
(
Styrol
)
C21
lOpF
(
II
)
C"
0.02
µF
(
MXL
)
c,.
®
lOµF
10V
X1
2T201
(2SA122)
x,
2T76 (2SC76)
Xa
2T76 (2SC76)
x,
2T66 (2SD66l
x,
2T65 (2SD65)
x.
2T65 (2SD65)
X1
2T65 (2SD65)
D1
1T23G
D2
1T23G
D,
1T52

Voltage and current distribution
for TR-714
Vo ltage I
Volt
Current
E 7,s
X1
B 6.5 ,s
300 ~ 350 µA
5 00
µA
C 0
--
E
0.31
x, B
0.41
300~350 µAs oo µA
C 8.3 ,s
--
E
0.31
Xa
B
0.51
65 ~ 750 µA,. 5 mA
C
8.3 ,s
--
E 0.
75
x, B
O.85
1~ 1.1 mA
2•5
mA
C
7.3 ,s
--
E
O.75s
x, B O.
85 s 1~
1.1 mA
2_5
mA
C
7.8 ,s
--
E 0
Xs. X1
B
0.151
650~750 µA,., mA
C 9 ,s
Current drain at O signal: 7 mA±2O %.
Measurement was performed with the negati ve lead of the
voltmeter connected to the negative side of the battery.
Internal resistance of the voltmeter is 20 KSJ /V.
Small figure next to data shows voltmet er range.
Power source voltage: 9 Volts.
-6-