Sharp GF-4545H User manual

SHARP SERVICE MANUAL
Type:
Power source:
Speakers:
Output Power:
(DIN 45 324)
Semiconductors:
Dimensions:
Weight:
Input terminals:
ATSM881127RCS
GF -4545H
GF -4545E
In the interests of user-safety the set should be
restored to its original condition and only parts
identical to those specified be used.
SPECIFICATIONS
Portable stereophonic cassette tape
recorder with FM/MW/LW 3-band
radio
AC IOV SS 120V 220 240.
50/60Hz
D.C. Internal (Batteries): (six
UM/SUM-1 or R20) (GF-4545H)
A.C. 240V, 50/60Hz
D.C. OV (six HP2) (GF-4545E)
10cm Woofer x 2 : Horn type
Tweeter x 2
MPO 4000mW (2000mW +
2000mW) on A.C.
RMS 3200mW (1600mW +
1600mW) on D.C.
6-IC, 4-Transistor, 17-Diode,
2-LED (Light Emitting Diode)
Width; 380mm (15”)
Depth; 94mm (3-3/4'’)
Height; 194mm (7-3/4")
2./Kg (5.9 lbs) without batteries
External microphone Jacks
(Left and Right)
Output terminals:
Input/Output terminals:
Other terminals:
External speaker jacks
(Left and Right)
Headphones jack
Record/Playback socket (DIN)
AC input socket
TAPE RECORDER SECTION
Type:
Tape:
Tape speed:
Frequency response:
Recording system:
Erasing system:
Wow and flutter:
Signal to noise ratio:
RADIO SECTION
Frequency range:
Intermediate frequency:
4-track stereo cassette tape recorder
Philips type compact cassette tape
4.8 cm/sec.
50 ~ 10,000Hz
AC bias
AC erasing
0.3% (DIN 45 511)
45dB
PM? 80 106M Z
MW; 520 ~ 1,620kHz
LV. GhOO = ZOOKrZ
FM; 10.7MHz
MW/LW; 455kHz (GF-4545H)
MW/LW; 465kHz (GF-4545E)
Specitications are subject to change without prior notice.
SHARP CORPORATION OSAKA, JAPAN
GF-4545H GF-4545E

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT,
PLEASE REFER TO THE OPERATION MANUAL.
NAMES OF PARTS
ap ia ca
4 <_—
hen a! 2625 PHOTO: GF-4545H
Figure 2—1 Figure 2—2
1. Built-in microphone (Left channel) 15. Build-in microphone (Right channel)
2. FM stereo indicator 16. Telescopic rod antenna
3. Recording/Battery condition indicator 17. External microphone jack (Left channel)
4. Volume control 18. External microphone jack (Right channel)
5. Tone control 19. Record/Playback (DIN) socket
6. Balance control 20. Headphones jack
7. Stop/Eject button 21. Monitor on/off switch
8. Play button 22. Beat cancel switch
9. Fast forward button 23. AC input socket
10. Rewind button 24. External speaker jack (Left channel)
11. Record button 25. External speaker jack (Right channel)
12. Function selector switch 26. Voltage selector switch (GF-4545H only)
13. Band selector switch 2/7, Battery compartment lid
14. Tuning control
DISASSEMBLY
(PHOTO:
GF-4545H)
Note:
Prior to disassembly, never forget to remove the AC supply
cord from a wall outlet.
A. FRONT CABINET REMOVAL (Refer to Figures 2-3 and
2-4)
1. Remove the battery compartment lid and take out six
batteries.
2. Remove six screws (A) retaining the back cabinet and
lightly open the front cabinet.
3. Remove two sockets from the main P.W. Board.
4. Then the front cabinet can be removed.
B. MECHANISM BLOCK REMOVAL (Refer to Figure 2-4) Figure 2—3
1. Unsolder the lead wires connected to the earth terminal
(TP5) ©).
2. Remove four tips, two screws, the sockets and the nylon
band ;
3. Then the mechanism block can be removed.
. MAIN P.W. BOARD REMOVAL (Refer to Figure 2-4)
. Remove three control knobs and tuning knob
. Remove six screws and a tip
. Then the main P.W. Board can be removed.
WN -Oo
Figure 2—4

MECHANICAL
ADJUSTMENT
=
FLYWHEEL
THRUST
CLEARANCE
ADJUSTMENT
(Refer
to
Figure
3-1)
eer
THRUST
ADJUST
WASHERS
1.
In
adjusting
and
assembling,
increase
or
decrease
the
0.3mm
a
number
of
thrust
adjust
washers
so
that
the
thrust
gap
Is
a
i:
maintained
at
0.1mm
~
0.3mm.
os
eae | Rea
| | FLYWHEEL
JE
Figure 3—1
®
PINCH
ROLLER
PRESSURE
ADJUSTMENT
(Refer
to
Figure
3-2)
1.
Set
the
unit
in
play
mode.
2.
Push
the
point
(AY
with
a
tension
gauge
(0
gr.
to
1000
gr.)
to
make
the
pinch
roller
apart
from
the
capstan.
TENSION
GAUGE
(0
~
1000g)
Then,
check
that
the
tension
gauge
will
read
350
gr.
to
550
gr.
when
the
pinch
roller
stops
to
rotate.
3.
As
a
result
of
the
check
in
the
step
2
above,
if
the
reading
is
found
outside
the
range
of
350
gr.
to
550
gr.,
adjust
the
spring
of
pinch
roller
by
bending
it
or
replace.
PINCH
HOLLER
PINCH
ROLLER
SPRING
Figure 3—2
TORQUE
CHECK
AT
PLAY,
FAST
FORWARD
AND
REWIND
MODES
Put
a
torque
meter
cassette
in
the
cassette
compartment
of
the
set,
and
see
that
the
measured
torque
in
each
mode
Is
normal
as
follows.
Torque
meter
cassette
Measured
torque
Play
back
TW-2111
30
~
70
gram-cm
- Fast-
forward
Rewind
TW-2231
70
~
140
gram-cm
TW-2231
70
~
140
gram-cm
TW-2111
TW-2231
Figure 3-3
="
AUTO
STOP
ADJUSTMENT
(Refer
to
Figure
3-4)
1.
Make
sure
that
the
auto
stop
mechanism
acts
rightly
at
the
tape
end,
2.
If
not,
adjust
the
stroke
by
bending
the
end
of
auto
stop
TAKE-UP TURNTABLE
lever.
AUTO STOP ARM
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1. Connect load resistors (4 ohm) to the external speaker
ELECTRICAL MEASUREMENT
* This unit operates on DC 9V. Check that the power supply
is exactly 9V before measurement.
Set the function selector switch (SW2) to ‘tape’ position.
*
# RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
(Refer to Figure 4-1)
WW
jacks (J202, J302) and connect outputs of both right and
left channels to the vertical and horizontal input terminals
of oscilloscope.
AC V.T.V.M.
EXT SP
(J302)
PLAYBACK MODE
TEST
TAPE
MTT —
114
(J202)
Figure 4—1
® RECORD AMPLIFIER SENSITIVITY CHECK a:
(Refer to Figure 4-2)
1. Connect 4 ohm (2W, 5%) dummy load resistors to the 3.
external
speaker
jacks
(J202,
J302)
and
connect
V.T.V.M.
4.
across the load.
EXT. MICROPHONE JACK
(J201, J301)
SIGNAL
GENERATOR
ATTENUATOR
RECORD MODE
_ Load the test tape (MTT-114, 10kKHz, —10dB recorded).
. Place the unit in play mode.
. Adjust the head azimuth adjusting screw so that Lissajou’s
waveform attains the maximum and the same phase In right
and left.
OSCILLOSCOPE
Connect signal generator for 1kHz, —63dB (OdB = 1V) to
the external microphone jacks (J201, J301).
Load the tape and place the unit in record mode.
If the record amplifier sensitivity is normal, the reading on
the V.T.V.M. should be approximately 0.15V.
EXT. SPEAKER
JACK (J202, J302)
V.T.V.M.
OSCILLOSCOPE
4 ohm
1 kHz
Figure 4-2
= PLAYBACK AMPLIFIER SENSITIVITY CHECK
(Refer to Figure 4-3)
1. Connect 4 ohm (2W, 5%) dummy load resistors to the 3. Place the unit in play mode with the volume control at
external speaker jacks (J202, J802) and connect V.T.V.M.
across
the
load.
4.
2. Load the test tape (MTT-112SP, 333Hz, —20dB recorded).
and playback.
EXT. SPEAKER
JACK
RECORD/
PLAYBACK
HEAD
PLAY MODE
TEST TAPE
MTT-112SP
maximum,
If the playback amplifier sensitivity 1s normal, the reading
on the V.T.V.M, should be 0.45V ~0.7V.
V.T.V.M. OSCILLOSCOPE
(J202, J302)
Figure 4—3
~~

GENERAL
ALIGNMENT
INSTRUCTION
Should
it
become
necessary
at
any
time
to
check
the
the
most
sensitive
range
of
the
output
meter,
alignment
of
this
receiver,
proceed
as
follows.
3.
Use
a
non-metallic
alignment
tool.
1.
Set
the
volume
control
(VR3)
to
minimum.
4.
Repeat
adjustments
to
insure
good
results.
2.
Attenuate
the
signals
from
the
generator
enough
to
swing
AM
ALIGNMENT
CHART
AM
IF
and
MW
RF
ALIGNMENT
|,
Set
the
function
selector
switch
(SW2)
to
“‘radio’’
position.
2.
Set
the
band
selector
switch
(SW1)
to
”
SIGNAL GENERATOR
step | JEST 3 DIAL
STAGE
CONNECTION
TO
INPUT
SIGNAL
SETTING
RECEIVER
FREQUENCY
MW" position.
METER
CONNECTION
WHERE TO
ADJUST
ADJUSTMENT
Connect
AM
sweep
Highest
Connect
an
Rotate
the
core
to
generator
to
the
455k
Hz
(400Hz,
frequency
oscilloscope
adjust
so
that
the
loop
antenna
and
30%,
AM
modu-
(to
extreme
between
the
waveform
becomes
place
it
near
the
bar
lation)
right)
test
point
maximum
and
sym-
antenna
(L5).
(TP6)
and
metrical
in
right
and
(The
output
of
ground
(TP5)
left
as
shown
in
signal
generator
A65kHz
(400H2
through
a
Fig.
5-1,
|
|
should
be
as
small
30%
AM
modu.
capacitor
(0.022
Repeat
this
until
as
possible.)
lation)
to
0.1
MFD.)
adjustment
be
satisfied.
Connect
AM
signal
510kHz
{(400Hz,
Lowest
fre-
Connect
Local
Adjust
so
as
to
generator
to
the
30%,
AM
modu-
quency
(to
V.T.V.M.
to
Oscillation
make
the
output
loop
antenna
and
lation)
extreme
left)
the
externa!
coll
be
maximum.
place
it
about
60cm
speaker
jack.
L6
(Set the volume
contro! (VR3)
tomas”)
apart from the bar
antenna (L5).
(The output of
signal generator
should be as smail|
as possible. }
Frequency
coverage
1650kHz, (400Hz,
30%, AM modu-
lation)
600kHz, (400Hz,
30%, AM modu-
lation)
1400kHz, (A0GHz,
30%, AM modu-
lation}
Oscillation
Same
as
step
2,
trimmer
TC5
Antenna coil
L5 (MW)
Highest
fre-
Same
as
step
2.
quency
(to
extreme right)
600kKHz
Same
as
step
2.
Same as step 2.
Same as step 2.
(See Note A)
Same as step 2.
Tracking
Antenna
trimmer
TC3
1400k
Hz
Same
as
step
2,
Same
as
step
2.
(See Note A)
Same as step 2.
2)
steps
2
and
3
or
4
and
5
until
no
further
improvement
can
be
made,
OSCILLOSCOPE
TEST
AM
SWEEP
LOOP
GENERATOR
ANTENNA
AM IF CURVE
AM RF/IF
AMP
@
GND (TPS5)
455k Hz (GF-4545H)
465kHz (GF-4545E)
TEST
AM
SIGNAL
LOOP
EXT.
SPEAKER
GENERATOR
ANTENNA
L5
(MW)
JACK
(J202,
J302)
Figure 5—1
Check
the
alignment
of
the
receiver
antenna
coil
by
requires
less
inductance.
Change
loop
inductance
by
sliding
the
bringing
a
piece
of
ferrite
(such
as
a
coil
slug)
near
the
antenna
—
bobbin
toward
the
center
of
ferrite
core
to
increase
induct-
loop
stick,
then
a
piece
of
brass.
!f
ferrite
increases
output,
ance,
Or
away
to
decrease
inductance,
loop
requires
more
inductance.
If
brass
increases
output,
loop
i
ss - 7
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LW RF ALIGNMENT
1.
Set
the
function
selector
switch
(SW2)
to
“radio”
position.
2.
Set
the
band
selector
switch
(SW1)
to
“LW”
position.
ERATOR
SIGNAL GEN DIAL
CONNECTION
TO
|
INPUTSIGNAL
|
SETTING
RECEIVER
FREQUENCY
Connect AM signal 145kHz (400Hz, Lowest fre-
METER WHERE TO
CONNECTION ADJUST
ADJUSTMENT
Connect Local Adjust so as to
generator
to
the
30%,
AM
modu-
quency
{to
V.T.V.M.
to
oscillation
make
the
output
loop
antenna
and
lation)
extreme
jeft)
the
external
coil
be
maximum.
place
it
about
60cm
speaker
socket
L7
(Set the volume
control (VR3)
to ‘’max’’.)
apart from the bar
antenna (L5).
(The output of
signal generator
should be as small
as possible.)
Frequency
coverage
Same
as
step
1
295kHz,
(400Hz,
|
Highest
fre-
Same
as
step
1.
Oscillation
Same
as
step
1.
30%,
AM
modu-
quency
(to
trimmer
lation)
extreme
right)
TC6
160kHz, (400Hz,
30%, AM modu-
lation)
260kHz, (400Hz,
30%, AM modu-
lation)
Same as step 1.
(See Note A}
Antenna coi!
L5 (LW)
=
3
Tracking
—
4
Repeat the steps 1 and 2 or 3 and 4 until no further improvement can be made.
Antenna
trimmer
TC4
Same as step 1.
(See Note A)
TEST
V.T.V.M.
AM
SIGNAL
LOOP
EXT.
SPEAKER
GENERATOR
ANTENNA
L5
(LW)
JACK
(J202,J302)
Figure 6—1
VR3
TP5
VR4
j%TP7
TP4
TC3
TC4
LE
TCS
L7
TC6
LS
TPZ
TC2
TP1
TRS
TCl
11
74 13 “TP6 T6 T2 FS L4
Figure 6—2 ALIGNMENT POINTS
es

1,
Set
the
function
selector
switch
(SW2)
to
“radio”
position.
FM ALIGNMENT CHART
2.
Set
the
band
selector
switch
(SW1)
to
“FM”
position,
SIGNAL GENERATOR
DIAL
METER
WHERE
TO
CONNECTION
TO
|
INPUT
SIGNAL
|
SETTING
|
CONNECTION
ADJUST
ADIUSTMENT,
RECEIVER FREQUENCY
Connect
FM
sweep
10.7MHz
(400Hz,
|
Highest
Connect
an
Tote
2o
hs
|
Rotate
the
core
to
generator
to
the
100%,
FM
modu-
|
frequency
oscilloscope
adjust
so
that
the
TP3
through
lation)
(to
extreme
between
the
waveform
becomes
a
capacitor
(5pF).
right.)
test
point
(TP4)
symmetrical
in
right
Connect
its
ground
and
ground
(TP5)
and
left
as
shown
side
to
the
chassis
through
a
in
Fig.
7-1
(A)
:
ground
(TP2).
Capacitor
(Rotate
the
core
of
(0.022
to
0.1
T4
fully
counter-
MFD.)
|
clockwise.)
Same
as
step
1.
Same
as
step
1.
Same
as
|
Same
as
step
1.
T4
Adjust
the
core
so
step
1.
that
the
waveform
(“'s’’ curve} becomes
Detection
symmetrical
in
up
and down with the
best linearity as
Lt.
i
|
shown
in
Fig.
7-1
Repeat
the
steps
1
and
2
until
no
further
improvement
can
be
made.
Connect
signal
gene-
|
87.1MHz
{400Hz,
|
Lowest
Connect
Local
Make
the
output
be
rator
through
a
30%,
FM
modu-
frequency
V.T.V.M.
to
oscillation
maximum,
dummy,
including
lation)
(to
extreme
the
external
coll
Output
impedance
left)
speaker
jack.
L4
of
signal
generator
(Set
the
volume
4
to
the
FM
antenna
control
(VR3)
TPs
:
to
‘’max*’.)
|
(Refer
to
Figure
Frequency
|
7-3)
Ground
lead
of
coverage generator connected
to the receiver
chassis (TP2).
Same
as
step
4.
JOOMHRz
(400Hz,
|
Highest
Same
as
step
4.
|
Oscillation
Same
as
step
4.
5
30%,
FM
modu-
frequency
trimmer
.
lation)
(to
extreme
TC1
right)
Same
as
step
4.
88MHz
(400Hz,
88MHz
Same
as
step
4.
RF
coil
Same
as
step
4.
30%, FM modu- a2
lation)
Track
ing
ne
ee
i
eee
Pee
;
ame
as
step
4.
108MHz
(400Hz,
|
108MHz
Same
as
step
4,
RF
Same
as
step
4.
7
30%,
FM
modu-
trimmer
TC2
ik.
lation)
|
|
I
|
8
Repat
the
steps
4
and
5
or
6
and
7
until
no
further
improvement
can
be
made.
FM IF CURVE
“S" CURVE
Figure 7—1
10.7MHz,
FM SWEEP
GENERATOR
FM FRONT
END
CIRCUIT
GND
GND (TPS)
{TP2)
EXT. SPEAKER
FM
SIGNAL
JACK
{J202,
J302})
FM ANTENNA
GENERATOR :
TERMINAL
DUMMY
(Fig. 7-3)
{TP2)
Figure 7—2
OSCILLOSCOPE
R |
Z« 75 (onm) << -
Re «
—V\V\A——_-—- TO ANTENNA
Rt = 37.5 (ohm)
(ohm )
Re
er
at
=
50
(ohm)
= h
poe R2=*= 50 (ohm)
4
-__—.—_»
TO
CHASSIS
GROUND.
Z= OUTPUT IMPEDANCE OF SIGNAL GENERATOR
Figure 7-3
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ra
IR cate snag
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Saaiatinestin atte Tee a
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mae
32 a ype A Lat ene +
at ae baa Peres:
[Note B] (Refer to Figure 8-1)
There are 5 kinds of ceramic filter (CF 1) available with this
unit and they are given color indication as tabulated below to
differentiate the central frequency from one to another among
them,
When other ceramic filter than the one (red)
having the
central frequency of 10.7 MHz are used, note that a marker
(10.7 MHz) of FM sweep generator, if used, will be deviated —
therefore, adjust the generator by putting off the marker.
Central
frequency
(fo)
FM MPX ALIGNMENT CHART
1, Set the function selector switch (SW2) to “radio” position.
SIGNAL GENERATOR
CONNECTION TO
RECEIVER
Connect FM stereo
signal generator
through a dummy,
including output
impedance of gene-
rator to the FM
antenna (TP 1).
(Refer to Figure 7-3)
Ground Jead of
generator connect to
receiver chassis.(TP2)
FM STEREO
SIGNAL GENERATOR
INPUT SIGNAL
FREQUENCY
Exactly 98 MHz
(54dB) unmodu-
jated
DUMMY (Fig. 7-3)
| | EM Ie AMP.
DIAL
SETTING
10.64 MHz + 30 kHz
10.67 MHz + 30 kHz
10.70 MHz + 30 kHz
10.73 MHz + 30 kHz
10.76 MHz # 30 kH2
Figure 8—1
2. Set the band selector switch (SW1) to ‘‘FM stereo “‘posi-
tion.
METER
CONNECTION
4
WHERE TO
ADJUST
ADJUSTMENT
Connect fre-
quency counter
through a 100K
ohm resistor to
the TP7.
Figure 8—2
1) Turn the drum fully clockwise and stretch its cord cover the
Parts in the numerical order .
2) Turn the tuning control shaft fully counterclockwise, and
fix it with the pointer aligned with the zero (O) point on
the dial scale.
Figure 8-3 DIAL CORD STRINGING
—8-—
VR4 Adjust for
19 +0.ikHz
TP7 FREQUENCY
COUNTER
Zero Point

VOLTAGE SELECTION (GF-4545H ONLY)
Take care to check the voltage setting of the voltage selector
before connecting supply lead plug to the domestic AC outlet.
If necessary adjust the setting as follows: Slide the voltage
selector to the “110 ~ 120V” or “220 ~ 240V”" position.
SELECTOR
30~ 120V 220~240V
—_=
Figure 9—1
EQUIVALENT CIRCUIT OF IC
FM IF FMF
OUTtN) IN(2): +e. OUTt uPC1212C (1C2)
:
eee eet!
-
¥
SA
—>+—
! Rs
Os
es
Ss oa
Input G
G
I
‘
Ry
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Ae
2
Da
5)
oho
y
$n
ui
Q:
3
Re
+-
(a) ae poe
TOP VIEW
8 7 6 §
ee Ey ae ca
sue a we Figure 9-3 EQUIVALENT
Figure 9-2 EQUIVALENT CIRCUIT OF IC (IC1) CIRCUIT OF IC (IC202, IC302)
STEREO /MONO
COMPARATOR I9kHz SWITCH
INPUT MONITOR P; F ,P:F. V.C.0. STOP
V.C.0.
MUTING
SCHMITT B a. 14 6
fpecia i DRIVER Input NF.B Output GND ALC ALC Vcc
Output Input
Vec COMPOSITE PRE AMP L—ch R—ch LAMP GNO SELECTIVITY
SIGNAL OUTPUT OUTPUT OUTPUT DRIVER CONTROL
INPUT
Figure 9-5 BLOCK DIAGRAM
Figure 9-4 BLOCK DIAGRAM OF IC (IC2)
OF IC (1C201, 1C301)
—~9—
PACKING METHOD (GF-4545E ONLY)
ACCESSORY
POLYETHYLENE
BAG
PACKING ADD. (LEFT)
(94F H463042001)
PACKING ADD. (RIGHT)-
(94FH463042002)
PACKING CASE
(94F H433042003)
Figure 10—1
CAUTION
(GF-4545E
ONLY)
If any one of the nylon bands shown in the Figure 10—2 is
once removed for some reason, be sure to reprise it to the
Original place in the same appearance as before.
FUSE GRAY
TRANSFORMER
Figure 10—2
—10—

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02 x4
0202~ 0208
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t
C239 ~ C242 P ER “
TRANSFORMER
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utah OHO ) 470/16V
BUILT-IN mel Po — Z 3 :
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207
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:
:
at
R-CH
O EXT. SPEAKER JACK
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EXT. MWC ACK :
L-CH . @ SP202
ig TWEETER
cr a eS) ae 7 L-CH
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ene sh (C520, monitor | ff lo 4ohm
7 |
: HEADPHONE JACK J @ SP302
SS a a a = ea | TWEETER
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SW6-B
BEAT
CANCEL
O S
DIN ha Q4 2SCI3I7R a
| __cmlicor
e The voltages are measured with VTVM under e Unless otherwise specified all resistance in
BESchiFTiGn es [swno. [—pescriprion [Position], foane! input regent
SW1 (A ~ H) Band Selector FM Stereo—FM Mono—MW—LW SN NO. pea es e@ Unless otherwise specified voltages are measur- e Unless otherwise specified all capacitance in
SW2 (A ~ D) Puncion Celacior SW6 (A, B) Beat Cancel ed in FM mode. microfarads. P = micro — microfarads.
SW3 A.B) eat AC/DC Selector AC — DC ( ) : MWor LW mode. e (ML) : Mylar film capacitor si
H
Swa
(A~
L)
Record/Play
back
SW8
(GF-4545H)
Voltage
Selector
110~120
—
220~240
:
Record
mode.
e@
(CH)
:
Temperature
compensating
ceramic
capacitor.
Motor
) are important for maintaining the ssafety
of the set. Be sure to replace these parts with specified ones for main-
taining the safety and performance of the set.
1 2 [Scares eg (GA (egg CoD EE) a 12
Figur. jEMATIC DIAGRAM
a
J
:
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| NOTES: Parts marked with “ /A\"
(Specifications or wiring diagrams of this model are subject to change for improvement without prior notice. ) |