Sharp FV-1710 User manual

Service M
SPECIFICATIONS
Circuit:
Frequency Range:
Intermediate
Frequency :
Power Supply:
Power Output:
Speaker :
Dimensions:
Weight:
18-transistor, 10-diode, 4-rectifier,
1-thermistor superheterodyne system
with AGC & AFC
LW 150~370 KHz
MW 530~1600 KHz
SW1 1.6~4.3 MHz
SW2 3.9~12.0 MHz
SW3 12.0~26.5 MHz
FM 86.5~108 MHz
AM 455 KHz
FM 10.7 MHz
DC 12 Volts (UM-1 battery x 8 pcs.)
or AC 110,220,240 Volts 50/60 cycles
1.2 watts (maximum)
6” x4” Oval P.D:.S.
4 ohms
12”(W) x4 3/4” (D) x8 1/4’ (H)
llpounds without batteries
anual
i
MODEL
FV-1710
a eel he ain a Te
TRANSISTOR COMPLEMENT
2SA234 (B) or (C) AM Oscillator
Ql
Q2
Q3
O4
Q5
06
Q7
Q8
Q9
Q10
Qu
Q12
Q13
Ql14
Q15
Q16
Q17
Q18
25A234 (C)
2SA234 (C)
29A435 (B)
2SA235 (C)
2SA235 (A)
25A234 (B)
25A234 (A)
25A234 (A)
25B75 (B)
25B75 (B)
2SB77 (B)
2SB77 (B)
2SB77 (B)*
25B77 (B)
2SA12 (A)
AM RF Amplifier
FM Mixer
FM Amplifier
FM Oscillator
FM Mixer
1st IF Amplifier
2nd IF Amplifier
3rd IF Amplifier
Audio Amplifier
Audio Driver
Audio Output
Audio Output
Audio Output
Audio Output
BFO
2SB370 (A) or (B) Power regulator
2SB370 (A) or (B) Power regulator
HAYAKAWA ELECTRIC CO., LID.
OSAKA, JAPAN

GENERAL DESCRIPTION
The
circuitry
used
in
this
six
band
portable
radio
incorporates
18
transistors,
10
diodes,
4
rectifiers
and
1
thermistor.
A
bar
antenna
feeds
the
LW
or
MW
broadcast
signal
to
the
converter.
A
telescopic
antenna
feeds
the
SW
or
FM
broadcast
signal
to
the
mixer.
The
AM
Singal
goes
through
2
IF
amplifiers
and
1
diode
detector.
The
FM
signal
goes
through
3
IF
amplifiers
and
2
diode
detector.
(matched
pair).
The
audio
signal
then
passes
through
a
6
transistor
audio
amplifier
circuit.
Local
oscillator
voltage
is
fed
back
to
the
mixer.
An
AM
AGC
voltage
is
fed
back
to
1st
IF
amplifier.
~
NS OF Ie f
CHASSIS REMOVAL
Slide
the
battery
cover
lock
button
to
OPEN
position
and
remove
the
battery
cover.
Remove
the
2
screws
retaining
the
back
cover
and
remove
the
back
cover.
Remove
all
the
jacks
(Car
Ant.,
Ext.
Ant.,
Phono,
Tuner
Output,
Earphone)
and
the
AC/DC
power
selector
knob
from
the
back
cover.
Detach
the
dial
cord
string
from
the
pointer.
Remove
the
AC
power
indicator
light
from
its
socket.
Pull
off
the
4
knobs
on
the
front
of
the
cabinet.
Take out the battery case.
Remove
7
chassis
mounting
screws
@.
And
the
chassis
can
be
removed.
Exercise
caution
to
avoid
breaking
the
leads.
If
necessary,
unsolder
the
leadwires
attached
to
the
chassis.
Battery Case Holding String
Figure 1

ALIGNMENT INSTRUCTION
Should it become necessary at any time to check the alignment of this receiver, proceed as follows:
1) Connect an output meter across the speaker voice coil lugs.
2) Set volume control for maximum. |
3) Attenuate the signals from generator enough to swing the most sensitive range of the output meter.
4) Use a non-metallic alignment tool.
5) Repeat adjustments to insure good results.
ALIGNMENT CHART
AM Alignment
Signal generator Receiver
| Adjust
Step | Band| Connection to receiver | Input signal frequency | Dial setting Remarks
1 | MW| Connect signal generator | Exactly 455KC. (400%, | Tuning gang fully | Adjust for maxi- | T-8, T-6
through a 10KOQ resistor | 30%, AM modulated.) open. mum output on| T-2
to the antenna tuning 7 (minimum capacity)|} the output meter | T-l
condenser. connected to the
Ground lead to the rece- | speaker voice coil
iver chassis. lugs.
Use radiating loop, loop | Exactly 525KC. (400%. | Tuning gang fully | Same as step 1.
of several turns of wire, | 30%, AM modulated.) closed.
or place generator lead (maximum capacity)
close to receiver for
adequate signal pickup. |
Connect generator output
to one end of this wire.
3 | MW| Same as step 2. Exactly 1650KC. (400%, | Tuning gang fully Same as step 1.
30%, AM modulated.) open.
(minimum capacity)
C14
Same as step 2. Exactly 600KC. (400%,
30%, AM modulated.)
600KC
eS (pee
30%, AM modulated.)
See NOTE A. L1M
5 | MW| Same as step 2. Exactly 600KC. (400%, | 600KC > Same as step 1. L14
30%, AM modulated.)
Same as step 2. ! Exactly 1400KC. (400%, | 1400KC Same as step l. C9
Exactly 1400KC. (400%. | 1400KC Same as step l. C19
30%, AM modulated.)
9 | LW | Same as step 2. Exactly 145KC. (400%, | Tuning gang fully | Same as step 1. L6
30%, AM modulated.) closed.
(maximum capacity)
10 | LW | Same as step 2. Exactly 380KC. (400%, | Tuning gang fully | Same as step 1. C13
30%, AM modulated.) open.
(maximum capacity)
Same as step 2. Exactly 180KC. (400%, | 180KC Same as step 4.
30%, AM modulated.)
12 | LW | Same as step 2. Exactly 180KC. (400%‘ | 180KC Same as step 1.
? 30%, AM modulated.)

Signal generator Receiver
Step | Band | Connection to receiver | Input signal frequency Dial setting | Remarks
13
|
LW
|
Same
as
step
2.
Exactly
350KC.
(400%,
|
350KC
Same
as
step
1.
C18
30%, AM modulated.)
14
|
LW
|
Same
as
step
2.
Exactly
350KC.
(400%,
|
350KC
Same
as
step
1.
C8
30%, AM modulated.)
15 | LW | Repeat steps 9, 10, 11, 12, 13 and 14 until no further improvement is obtained.
16 |SW1]| Connect signal generator | Exactly 158MC. (400%, | Tuning gang fully | Same as step 1. L8
through a 10KQ resistor | 30%, AM modulated.) closed.
to the external antenna (maximum capacity)
jack.
Ground lead to the rece-
iver chassis. |
cate pe Pacem each gg all ee eee i Ne ate eee nc ere ge he ee
17 |SW1)| Same as step 16. Exactly 4.5MC. (400%, | Tuning gang fully | Same as step 1. C15
30%, AM modulated.) open.
(minimum capacity)
fon ee ee et i ee ee oe as pee ee ere PS a
18 Iswi Same as step 16. Exactly 1.7MC. (400%, | 1.7MC Same as step 1. L2
| 30%, AM modulated.)
19 )/SW1)| Same as step 16, Exactly 1.7MC. (400%, | 1.7MC Same as step 1. 15
30%, AM modulated.)
20 |SW1/| Same as step 16. Exactly 3.7MC. (400%, | 3.7MC Same as step l. C10
30%, AM modulated.)
21 |SW1) Same as step 16. Exactly 3.7MC. (400%, | 3.7MC Same as step l. C20
30%, AM modulated.)
et I ne Ne ee ee
22 sw. | Repeat steps 16, 17, 18, 19, 20 and 21 until no further improvement is obtained.
‘
23 |SW2)\Same as step 16. Exactly 3.8MC. (400%, | Tuning gang fully | Same as step 1. L9
30%, AM modulated.) open.
(maximum capacity)
24 |SW 2) Same as step 16. Exactly 12.2MC. (400%, | Tuning gang fully | Same as step 1. C16
30%, AM modulated.) open.
(minimum capacity)
a NN ee ets sees ec Be Sno ee ne a A ee at a ee ee ee
25 |SW2| Same as step 16. Exactly 4.5MC. (400%, | 4.5MC Same as step l. L16
30%, AM modulated.)
27 |SW2| Same as step 16. Exactly 10MC. (400%, | 10MC Same as step l. Cil
30%, AM modulated.)
De | PLE eae ene eevee eNO NUON ek es Sd OSC OS RN 5 aA Oe Se | Se OR NN Reser CON ree eet ee eee ere
28 |SW2| Same as step 16. Exactly 10MC. (400%, | 10MC Same as step 1. C2li
30% AM modulated.)
I NCS ee ce ne a a ete SC RE a a RGR | PO RL yc ee ee (See eine eee een eee,
29 [swa| Repeat steps 23, 24, 25, 26, 27 and 28 until no further improvement is obtained.
30 |SW3j Same as step 16. Exactly 11.8MC. (400%, | Tuning gang fully | Same as step 1. L10
30%, AM modulated.) closed.
| (maximum capacity)
31 |SW3)| Same as step 16. Exactly 11.8MC. (400%, | Tuning gang fully | Same as step 1. ies by
30%, AM modulated.) closed.
(maximum capacity)
32 |SW3)| Same as step 16. Exactly 13MC. (400%, | 13MC Same as step l. L4
30%, AM modulated.)
33 | SW3)| Same as step 16. Exactly 13MC. (400%, | 13MC Same as step l. L17
30%, AM modulated.)
| ee ee eee eae
4

Signal generator Receiver
30%, FM modulated.)
Adjust
Step | Band| Connection to receiver | Input signal frequency Dial setting Remarks
34 |SW3! Same as step 16. Exactly 23MC. (400%, | 23MC Same as step 1. C12
30%, AM modulated.)
35 |SW3)] Same as step 16. Exactly 23MC. (400%, | 23MC Same as step 1. C22
30%, AM modulated.)
36 [sw3 Repeat steps 30, 31, 32, 33, 34 and 35 until no further improvement is obtained.
37 | MW | Same as step 2. 600KC (unmodulated) 600KC Adjust for L18
maximum beat.
FM Alignment
Signal generator Receiver |
Adjust
Step | Band| Connection to receiver Input signal frequency Dial setting Remarks |
1 | FM | Connect signal generator | Exactly 10.7MC. (400%, | Tuning gang’fully | Connect a 0.04mfd | T-7
through a 5pF capacitor | 30%, AM modulated.) closed. condenser between | T-5, T-3
to FM mixer emitter, (maximum capacity)| chassis ground and | T-4
test point 1, of Q6. to Q9 collector, | For maximum
Ground lead to the rece- test point 5. Con- | indication.
iver chassis. nect AC millivolt
meter between TP8
and chassis ground.
2 | FM/| Same as step 1. Exactly 10.7MC. Same as step 1. Remove 0.04 mfd. | T-9
(Unmodulated) condenser, follow
NOTE B.
3 | FM | Connect signal generator | Exactly 86MC. (400%, | Tuning gang fully | Adjust for the | L11
through a 1000 resistor, | 30%, FM modulated.) closed. maximum indica-
including output imped- (maximum capacity)] tion on the output
ance of signal generator meter connected
to the external antenna | across the voice
jack, coil lugs.
Ground lead to the rece-
| iver chassis.
4 | FM | Same as step 3. | Exactly 110MC. (400%, | Tuning gang fully | Same as step 3. C24
| 30%, FM modulated.) open.
| | | (minimum capacity)
5 | FM| Same as step 3. Exactly 88MC. (400%, | 88MC Same as step 3. L5
30%, FAM modulated).
6 | FM | Same as step 3, Exactly 88MC. (400%, | 88MC Same as step 3. L12
30%, FM modulated.)
7 | FM | Same as step 3. Exactly 108MC. (400%, | 108MC Same as step 3. C23
30%, FM modulated.)
8 FM | Same as step 3. Exactly 108MC. (400%, | 108MC Same as step 3. C25
9 FM | Repeat steps 3, 4, 5, 6, 7 and 8 until no further improvement is obtained.

CAR
ANT.
ADJUSTMENT
(AM
Alignment)
Signal
generator
Receiver
Adjust
Step
Band
Connection
to
receiver
|
Input
signal
frequency
Dial
setting
|
Remarks
1
|
MW|
The
S6
should
be
switch-
|
Exactly
600KC.
(400%,
|
600KC
Adjust
for
maxi-
|
L28
ed
over
to
Car
Antenna
|
30%,
AM
modulated.)
mum
output
on
and
connect
signal
gene-
the
output
meter
rator
through
the
Car
connected
to
the
|
Antenna
dummy
(See
|
speaker
voice
coil
NOTE
C)
to
the
Car
lugs.
Antenna
jack.
2
|
MW|
Same
as
step
1.
Exactly
1400KC.
(400%,
|
1400KC
Same
as
step
l.
C120
30%,
AM
modulated.)
3
|
MW
|
Repeat
steps
1
and
2
until
no
further
improvement
is
obtained.
4
|
LW
|
Same
as
step
1.
Exactly
180KC.
(400%,
|
180KC
Same
as
step
l.
L27
30%,
AM
modulated.)
|
cea
ah
Nig
Ss
Same
as
step
1.
Exactly
350KC.
(400%,
|
350KC
Same
as
step
l.
C118
30%,
AM
modulated.)
o1
LW
6 | LW | Repeat steps 4 and 5 until no further improvement is obtained.
NOTE
A.
Check
alignment
of
receiver
antenna
coil
by
bringing
a
piece
of
ferrite
(such
as
a
coil
slug)
near
the
antenna
loop
stick,
then
a
piece
of
brass.
If
ferrite
increases
output,
loop
requires
more
inductance,
change
loop
inductance
by
sliding
the
bobbin
toward
the
center
of
ferrite
core
to
increase,
or
way
to
decrease
inductance.
B.
1)
Connect
VTVM
(0.1
volts
range
DC
scale)
between
test
point
10
and
chassis
ground.
Set
VTVM
zero
volt
center.
2) Adjust discriminator secondary. core (orange) for 0 volt on VIVM.
3) Change signal generator frequency 10.7MC+100KC and —100KC approximately.
4)
Adjust
discriminator
primary
Core
(green)
for
balanced
peaks.
Peak
separation
should
be
approximately
200KC.
C. Car ant. Dummy
4
t
{
t
I
t
{ t I
( I
I {
ee |
IS pfd
65 pfd |
| CAR ANT.JACK
(R=80-R’)
l
R’=
out
put
impedance
SIGNAL
GENERATOR.
of
signal
generator
SSS ne ee ee, ee ee
CAR ANT. DUMMY
Figure 2

IFT-6 L 18
AC-BATT. SWICH
CAR ANT. JACK / yer. iF T-9 3
IFT-20IFT-1
POB-A
TS
IFT
fe
lis
LI4
LIZ
L8
L7
L6
L2
Photo
1
-
Back
View
of
Chassis
Photo
2
-
Side
View
of
Chassis
PCB Ae R?
Photo 3 - Front. View of Chassis
LIL LIM
AC Line Cord
SELEN-27
94 $3 $2 PCB “G” C7 PCBD’ S|
Photo 4 - Top View of Chassis
8

DIAL. CORD STRINGING
PULLEY
CORD
AKE_UP_SPRI
CS
>
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Figure
3

Ws
—
age
=
ca
Se
TPR
Figure 4 - P.C. Board A
LIS(LW RF)
@
Lid
(sw2 osc), |) pe eee ca ES LT7(MW OSC)
ane Lé (LW OSC)
i4 ©
(SW3 ANTR
P.C.
Board
B
P.C.
Board
C

D-02
Figure 6 - P.C. Board D
Figure 8 - P.C. Board F
S3-!
10
Figure 7 - P.C. Board E
an
AC LINE
A.
doy
| Aw!
Figure 9 - P.C. Board G