Sharp FV-1800 User manual

Service
Manual
Gagua
MODEL
FV-1800
SPECIFICATIONS
TRANSISTOR
COMPLEMENT
Frequency
Range:
LW
_
150~370
kHz
Ql
2SA234
®)
AM
Oscillator
MW
520~1620
kHz
Q2
2SA234
©
AM
RF
Amplifier
SW1
1.6~4.3
MHz
Q3
2SA234
©
AM
Mixer
SW2
3.9~12.0
MHz
Q4
2SK19
FM
RF
Amplifier
SW3
12.0~26.5
MHz
Q5
28C535
©
FM
Mixer
FM
88&~108
MHz
Q6
28C461
®
FM
Oscillator
Intermediate
Frequency
:
Q7
2SA234
®)
Ist
IF
Amplifier
AM
455
kHz
Q8
28A234
@
2nd
IF
Amplifier
FM
10.7
MHz
Q9
=2SA234
©
3rd
IF
Amplifier
Power
Supply
:
DC
12V
(UML
battery
x
8)
or
Q10
2SA12
©
BFO
AC
100~120,
200~240V
50/60Hz
Qll
2S8C458
®
Audio
Amplifier
Power
Output
:
Undistorted
2W
Ql2
28C458
®
Audio
Amplifier
Maximum
3.5W
Q13
2SB75
®
Audio
Driver
Speaker
:
3-1/2"
x
4”
(9cem
x
10cm)
Oval
Ql4
2SB370
®
Audio
Output
P.D.S.
V.C.
imp.
4
ohms
Q15
=
=2SB370
®
Audio
Output
Dimensions
:
35cm
CW)
x
23.8cm
(H)x14cm
(D)
Q1i6
25C830
®
Power
Stabilizer
(13-3/4"
x
9-3/8"
x
5-1/2")
Q17
28C458
®
Power
Stabilizer
Weight
:
5.5
Kg
(121ds)
without
batteries
SHARP
CORPORATION
osaka,
sapan

GENERAL DESCRIPTION
The circuit used in this 6 band portable radio incorporates 17 transistors 13 diodes and 2 thermistors.
A
ferrite
bar
antenna
feeds
the
AM
broadcasting
signal
to
the
AM
mixer
and
a
telescopic
rod
antenna
feeds
the
AM
broadcasting
signal
to
the
AM
mixer,
2
IF
amplifiers
and
a
diode
detector.
A
telescopic
rod
antenna
feeds
the
FM
broadcasting
signal
to
the
FM
RF
amplifier,
FM
mixer,
3
IF
amplifier
and
FM
detector
(2 diodes).
The audio signal passes through a 5 transistor audio amplifier circuit.
An
AM
AVC
voltage
is
fed
back
to
the
1st
IF
amplifier.
An
FM
AVC
voltage
is
fed
back
to
the
FM
RF
amplifier.
An
AFC
voltage
is fed
back
to
the
FM converter.
FM — AM_ IF SECTION
ny
ma,
FM
TUNER
SECTION,
EM
SAM,
IF
SECTION
ang
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AV
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RF
AMP
FM
MIX
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AMP
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IF
AMP
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AMP
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TUNER
SECTION
“"———~""BowER
SOUCE
SECTION
Figure 1 BLOCK DIAGRAM

CHASSIS
REMOVAL
(Refer
to
Figure
2)
Remove
the
six
control
knobs
(A)
on
the
front
panel.
Take off the battery cover.
Loosen
the
five
screws
(B)
on
the
back
of
the
set.
Fasten
the
terminal
compartment
cover.
Remove
the
antenna
cord
(C),
indicator
cord
(D),
battery
cord
(E)
and
speaker
cord
(F).
Loosen
the
five
chassis
retaining
screws
(G).
Gently
pull
out
the
chassis
toward
you.
When
assembling,
reverse
the
order.
Figure 2 CHASSIS REMOVAL

GENERAL ALIGNMENT INSTRUCTIONS
Should it become necesary 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 the volume control for maximum.
3) Attenuate the signals from the 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
Signal generator
Receiver
Step
Band Connection to receiver
Input signal frequency
Dial setting
Remarks
Adjustment
Connect signal generator
through a 10K ohm dummy
to the antenna tuning con-
denser.
Ground lead to the receiver
chassis.
Use radiation loop.
Loop of several turns of
wire, or place generator
lead close to receiver for
adequate signal pickup.
Generator output to one
end of this wire.
Exactly 455kHz (400Hz,
30%, AM modulated)
Tuning gang fully
open.
(minimum capacity)
Adjust for maximum
output on speaker
voice coil lugs.
T10
T8
T6
T2
Tl
Exactly 600kHz (400Hz,
30%, AM modulated)
Adjust the MW oscil-
lator core (L7), and
then adjust the MW
antenna coil (L14, L1).
(See NOTE A)
4 | MW | Repeat steps 2 and 3 until
Same as step 2
Exactly 1400kHz (400Hz,
30%, AM modulated)
1400kHz
Adjust the MW oscil-
lator trimmer (C16),
and then adjust the
MW antenna trimmer
(C201, C21).
(See NOTE A)
no further improvement can
be made.
5
LW
Same as step 2
Exactly 180kHz (400Hz,
“30%, AM modulated)
180kHz
Same as step 2
Exactly 350kHz (400Hz,
30%, AM modulated) ©
LW
Repeat steps 5 and 6 until
no further improvement can
350kHz
be made.
swl
Same as step 2
Exactly 1.7MHz (400Hz,
30%, AM modulated)
Same as step 2
Exactly 3.7MHz (400Hz,
30%, AM modulated)
1.7MHz
Adjust the LW oscil-
lator core (L6), and
then adjust the LW
antenna coil (L13, L1).
(See NOTE A)
Adjust the LW oscil-
lator trimmer (C17),
and then adjust the
LW antenna trimmer
(C22, C202).
(See NOTE A)
Adjust the SW1 oscil-
lator core (L8), and
then adjust the SW1
antenna core (L2, L15).
Repeat steps 8 and 9 until no further improvement can be made.
Adjust the SW1 oscil-
lator trimmer (C15),
and then adjust the
SW1 antenna trimmer
(C20, C12).

Signal generator
Receiver
Adjustment
NOTE A
Step
|
Band
Connection
to
receiver
Input
signal
frequency
Dial
setting
Remarks
11
|
SW2/!
Same
as
step
2
Exactly
4.5MHz
(400Hz,
|
4.5MHz
Same
as
step
1
Adjust
the
SW2
oscil-
30%,
AM
modulated.)
lator
core
(L9),
and
then
adjust
the
SW2
antenna
core
(L16,
L3).
12
'sw2
|
Same
as
step
2
Exactly
10MHz
(400Hz,
|
10MHz
|
Same
as
step
1
Adjust
the
SW2
oscil-
|
30%,
AM
modulated.)
|
lator
trimmer
(C14),
and
then
adjust
the
SW2
antenna
trimmer
(C19, C11).
13
|
SW2/|
Repeat
steps
11
and
12
until
no
further
improvement
can
be
made.
14
|SW3
|
Same
as
step
2
Exactly
13MHz.
(400Hz,
|
13MHz
Same
as
step
1
Adjust
the
SW3
oscil-
30%,
AM
modulated.)
lator
core
(L10),
and
then adjust the SW3
antenna core (L17, L4).
15
|SW3
|
Same
as
step
2
Exactly
23MHz
(400Hz,
|
23MHz
Same
as
step
1
Adjust
the
SW3
oscil-
30%,
AM
modulated.)
|
lator
trimmer
(C13),
and then adjust the
| SW3 antenna trimmer
|
|
|
(C18,
C10).
Repeat
steps
14
and
15
until
no
further
improvement
can
be
made.
.
Check
the
alignment
of
the
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.
If
brass
increases
output,
Change
loop
inductance
by
sliding
the
bobbin
toward
the
center
of
ferrite
core
to
increase
inductance,
FM ALIGNMENT CHART
Signal generator
Receiver
Step Connection to receiver
Input signal frequency
Dial setting
Remarks
loop requires less inductance.
or away to decrease inductance.
Adjustment
1 | Connect signal generator
Exactly 10.7MHz (400Hz, |
Tuning gang fully
Connect VTVM be-
Detune
T12 and T13
through
a
5PF
dummy
to
test
|
30%,
AM
modulated)
closed.
tween
test
point
|
Tune
T9,
T7,
T5,
T4
and
point
TP-1.
Generator
ground
(maximum
capacity)
|
TP-6
and
chassis
|
T3
for
maximum
indica-
lead
to
the
receiver
chassis.
ground.
tion.
2
Same
as
step
1
Exactly
10.7MHz
Same
as
step
1
See
NOTE
B
See
NOTE
B.
Cunmodulated)
3
|
Connect
signal
generator
|
Exactly
88MHz
(400Hz,
|
88MHz
Adjust
for
maxi-
|
Adjust
the
FM
oscillator
through
a
75
ohm
resistor
in-
|
30%,
FM
modulated)
mum
output
on
|
coil
(L12),
and
then
cluding
output
impedance
of
speaker
voice
coil
|
adjust
the
FM
RF
coil
signal
generator
to
the
tele-
lugs.
CELL,
L5):
scopic
rod
antenna.
Ground
lead
to
the
receiver
chassis.
4
|
Same
as
step
3
Exactly
108MHz
(400Hz,
|
108MHz
Same
as
step
3
Adjust
the
FM
oscillator
30%, FM modulated)
trimmer (C9), and then
adjust the FM RF trim-
mer (C8, C7).
5
|
Repeat
steps
3
and
4
until
no
further
improvement
can
be
made.
rr
rN
sss
NOTE B
1)
Connect
VIVM
(0.1
volt
range
DC
scale)
between
test
point
TP-3
and
chassis
ground.
2) Adjust T13 for 0 volt.
'3)
Change
signal
generator
frequency
10.7MHz+100kHz
and
—100kHz
approx.
Peak
separation
should
be
approx.
200kHz.
4) Adjust T12 for balanced peaks.

CAR ANT. ADJUSTMENT
(In case of car use, set the switch (SW6) to “Car (2)” position.)
ee
Signal generator Receiver
Adjustment
Step | Band Connection to receiver Input signal frequency Dial setting Remarks
1
|
MW
|
Use
radiation
loop.
Loop|
Exactly
600kHz.
(400Hz
|
600kHz
Adjust
for
maxi-
|
Adjust
the
MW
=
an-
of
several
turns
of
wire,
or
|
30%,
AM
modulated.)
mum
output
on
|
tenna
coil
(L14,
L202).
place generator lead close speaker voice coil | (See NOTE A)
to receiver for adequate lugs.
signal pickup.
Connect generator output
to one end of this wire.
2
|
MW|
Same
as
step
1
Exactly
1400kHz.
(400Hz,
|
1400kHz
Same
as
step
1
Adjust
the
MW
=
an-
30%, AM modulated.) tenna trimmer (C21,
C203).
(See NOTE A)
3 | MW| Repeat steps 1 and 2 until no further improvement can be made.
4 | LW | Same as step 1 Exactly ~ 180kHz. (400Hz 180kHz Same as step 1 Adjust the LW = an-
30%, AM modulated.) tenna cail (L13, L201).
(See NOTE A)
5 | LW | Same as step 1 Exactly 350kHz (400Hz, | 350kHz Same as step 1 Adjust the LW an-
30%, AM modulated.) tenna trimmer (C22,
C204).
(See NOTE A)
6 | LW] Repeat steps 4 and 5 until no further improvement can be made.
: I5pfd
65pfd CAR ANT. JACK
(R = 80—R’)
R’= out put impedance
of signal generator
pe
SIGNAL GENERATOR
CAR
ANT.
DUMMY
Figure 3

(4) BAND
BAND SELECTOR SHAFT
PULLEY
fee)
64
TUNING SHAFT
2 —
(ums
9
(Bs) FREQUENCY
1% TURNS
I\orum(a)
3\LTURN
Figure
4
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