Sharp GF-9090H User manual

GF-9090H.HB GF-9090E
Manual
@ APSS
Auto Program Search System
MODEL
GF-9O09OH sinver Panes
GF-9O90B#B eeiack Pane!
GF-9090E
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
GENERAL
Type:
Power source:
Power consumption:
Speaker:
Power output:
Semiconductors:
Dimensions:
Weight:
Input terminals:
Output terminals:
Portable stereophonic cassette tape re-
corder with built-in LW/MW/SW/FM
4-band radio
AC 110/220/240V, 50/60 Hz(H, HB)
AC 240V, 50/60 Hz (E)
DC 12V (Eight UM/SUM-1 batteries
or External DC supply)
24 watts
16cm (Woofer) x 2, Horn type (Twee-
ter) x 2
MPO 8000 mW (DIN 45 324) (H, HB)
MPO 11W (E): AC operation
RMS power 7000 mW
(3500 mW + 3500 mW: DC operation)
5-IC (Integrated Circuit), 47-transistor
and 37-diode (4 Light Emitting Diode)
485mm(W) x 115mm(D) x 240mm(H)
5.8 kg (without batteries)
EXT. MIC. 600 ohms (J201, J202)
Remote control (J302)
EXT. DC power, 12V (J701)
AC input power (SO701)
REC/PB DIN socket, 2.5 mV/10K
ohms (SO202)
FM EXT. Antenna (SO1)
EXT. speaker, 4 ~ 8-ohms (SO301,
$0302)
PHONES : 4 ~~ 8 ohms (J301)
REC/PB DIN - socket, 1V/50K
ohms (SO202)
=O MAPWNH
WN
TAPE RECORDER SECTION
Type:
Tape:
Tape speed:
Recording system:
Erasing system:
Recording time:
Fast forward or
rewind time:
Frequency response:
Wow and flutter:
S/N ratio:
RADIO SECTION
Frequency range:
Intermediate
frequency:
Circuit system:
Antenna:
4-track stereo cassette tape recorder
Philips type compact cassette tape
4.8 cm/sec.
AC bias
DC erasing
60 minutes (with C-60 tape)
120 sec. (with C-60 tape)
40 ~ 15,000 Hz (CrO2 tape)
40 ~ 12,000 Hz (Normal tape)
0.3% (DIN 45 511) (H, HB)
0.15% (WRMS) (E)
dB 50
LW 150 ~ 285 kHz
MW 520 ~ 1,620 kHz
SW 5.95 ~ 18 MHz
FM 87.6 ~ 108 MHz
LW/MW/SW 455 kHz
FM 10.7 MHz
4-band superheterodyne system
LW/MW ferrite core bar antenna
SW/FM telescopic antenna
FM EXT. antenna
SHARP CORPORATION OSAKA, JAPAN

NAMES OF PARTS (Refer to Figure 1)
Record key Rewind/Review key
Playback key Eject key
Fast forward/Cue key ae ae st —— Function selector switch
Editor switch
FM muting switch
Pause key —__----—~ AFC switch
FM/SW rod antenna Band selector switch
Meter
ial/Mete: :
Dial/Meter
selector
switch
light switch
Record level control
(L-ch} (R-ch}
Loudness switch
Stop key
Bass
control
ALC/Manual
switch
Treble control Forward Reverse ——_———— Equalizer selector switch
APSS key APSS key
Balance
control
Bias
selector
switch
Volume
control
——..———-.
a
Mode
selector
switch
Tuning/R-ch record _ a : a = FM stereo indicator
and playback level meter Z|
Battery condition/L-ch
record and playback tevel meter ~
| r 7 - --—— APSS indicator
— Tuning control
Built-in i Built-in microphone
preeenste
i
(R-ch)
PULL ARO STOP
Digital tape counter
Headphone jack | a -—— Cassette holder
Remote
control
jack
External
microphone
jack
Mains
RIF socket
Record/Play back
switch
socket
(DIN)
External
x
DC jack
Battery compartment lid I _____ Mains voltage selector switch (GF-9090H,HB)
Mains Power switch (GF-9090E)
FM external antenna socket — — | aan External speaker socket
(R-ch) (L-ch}
Figure 1

DISASSEMBLY
OPERATION
ON
MAINS
A->|BE={C {DFE | GF-9090H, HB
™
Before
operating
the
unit
on
mains,
check
the
pre-set
[A] FRONT CABINET REMOVAL (Refer to Figures 2 and 3)
1. Pull out the power cord plug or adaptor plug from the unit.
2. Take out the cassette tape from the cassette holder.
3. Remove the battery compartment lid and eight (8) bat-
teries from the battery compartment.
. Remove eight (8) screws retaining the front cabinet.
5. Gently pull out the front cabinet and disconnect four (4)
tips (Speaker) connected to the main P.W. board.
-
voltage. If the voltage is different from your local voltage,
adjust
the
voltage
as
follows:
Rotate
the
plug
of
the
voltage
selector
by
using
a
screwdriver
so
that
your
local
voltage
number can be seen. (Refer to Figure 6)
GF-9090E
Switch the mains power switch to the “ON” position.
® When the unit is used on batteries, pull out the mains
B|
OPERATION
PANEL
REMOVAL
(Refer
to
Figure
2)
plug
from
the
unit.
Otherwise
switch
off
at
the
mains
SWITGh
1.
Remove
the
front
cabinet
as
described
in
front
cabinet
power
switch
after
use.
(Refer
to
Figure
6)
GF-
9090E
removal.
Figure
2
Figure
6
2.
Remove
six
(6)
knobs
(VOLUME,
BALANCE,
TREBLE,
DIAL CORD STRINGING
(Refer to Figure 7)
BASS
and
RECORD).
|
.
Remove
four
(4)
screws
retaining
the
operation
panel.
4. Gently
lift
up
the
operation
panel
from
the
back
cabinet.
Ww
[(C]
DIAL
SCALE PLATE
REMOVAL
(Refer
to
Figure
3)
1.
Remove
the
operation
panel
as
described
in
operation
panel
removal.
2.
Remove
four
(4)
screws
retaining
the
dial
scale
plate.
3.
Gently
pull
out
the
dial
scale
plate
from
the
chassis.
DIAL POINTER
PULLEY
[D]
MECHANISM
BLOCK
REMOVAL
(Refer
to
Figure
4)
1.
Remove
the
dial
scale
plate
as
described
in
dial
scale
plate
removal.
2.
Disconnect
the
tip
(Muting)
and
two
(2)
sockets
(SO2,
$0501)
connected
to
the
main
P.W.
board
and
the
motor
P.W.
board.
3.
Remove
four
(4)
screws
retaining
the
mechanism
block.
4.
Gently
pull
out
the
mechanism
block
form
the
back
cabinet.
PULLEY
[E]
CHASSIS
(P.W.B.)
REMOVAL
(Refer
to
Figure
5)
1.
Remove
the
mechanism
block
as
described
in
mechanism
block
removal.
2. Remove the tuning knob from the tuning shaft.
3.
Disconnect
two
(2)
tips
(Antenna)
connected
to
the
main
TUNING
SHAFT
P.W.
board.
4.
Remove
six
(6)
screws
retaining
the
chassis
(P.W.B.).
5.
Gently
pull
out
the
chassis
(P.W.B.)
from
the
back
cabinet.
enWs Li)
OY)
Ay _———/
Zo
ae = a
Figure 5 Figure 7

DESCRIPTION OF APSS
APSS is the abbreviation of Automatic Program Search
System that permits advancing the tape past an unwanted
selection to the beginning of the next program automati-
cally with one push of a key. In this machine, the APSS
in the reverse direction is also realized besides that in the
forward play. That is to say, this unit is equipped FWD.-
APSS key ( <q ) and REV.-APSS key ( p> ). In playback
mode when the FWD.-APSS key is depressed the tape
is fed at a high speed and is slowed down to a regular play
speed at the beginning of the next selection. Or, when the
REV.-APSS key is depressed the tape is rewound at
a high speed and is set to regular playback mode at the
beginning of the selected program. The following explana-
tion refers to the function of the APSS.
FUNCTION OF APSS
When the FWD.-APSS key is depressed in playback mode
of the tape, the pinch roller is cleared from the flywheel
shaft and the roller assembly meshes with the gear of the
take-up turntable permitting the tape to advance at a
normal fast forward speed. On the other hand, when the
@) APSS INDICATOR CIRCUIT
(Refer to Figures 8, 9, 10 and 11)
With the APSS indicator circuit being given +12V power,
the multi-vibrator (Q502 and Q501) starts to oscillate
to n Hz (about 2 Hz) and output of the multi-vibrator
will be applied to the flip-flop circuit (Q503 and Q504)
to be 1/2 divided into 1/2n Hz (about 1 Hz). These
outputs of the multi-vibrator and flip-flop circuit are to
light up the light emitting diodes DS13, D512 and D511
through the logical circuit (D501 to D506). Figure 10
is a timing chart concerning the above operation.
In Figure 10, 1) and 2) are output waveformes of the
multi-vibrator (Q502 and Q501), and 3) and 4) are
those of the flip-flop circuit (Q503 and Q504). Using
these four (4) waveforms, the logical circuit is to further
create waveforms 5), 6) and 7) to have the light emitting
diodes light up.
The horizontal axis shown in Figure 10 refers to a time
axis: the light emitting diodes D513, D512 and D511
light up in this order one after another, respectively
at the periods a, b and c. Meanwhile, at the period d,
all the light emitting diodes are kept off. The periods
a to d are considered one cycle of the light-up operation
and this cycle is repeated: the light-up operation looks
as if it moved from right to left.
Q505 and Q506 are switching transistors. When the
FWD.-APSS key is depressed, the Q505 will be turned
“ON” while the Q506 will do so when the REV.-APSS
key is depressed. As for the REV.-APSS operation
mode, the light emitting diodes D511, D512 and D513
light up in this order one after another, respectively
at the periods a, b and c --- the light-up operation looks
as if it moved from left to right.
FWD.-APSS key is depressed, the FWD.-APSS switch
(SWSO1) is turned “ON” so that +12V power be applied,
via D509, to the APSS indicator circuit 1) , muting circuit
(2) and APSS detection circuit @.
Playback
key
Record
key
Fast
forward
Rewind/
/Cue
key
mm.
Review
key
Pause
key
Eject
key
Forward Reverse
APSS key APSS key
(FWD-APSS) (REV-APSS}
Stop key
Figure 8 FUNCTION KEY LAYOUT
Q501~9506
ascassic) ALY
APSS INOKATOR,
Figure9 APSS INDICATOR CIRCUIT
APSS INDICATOR PERIOD
jee
NUE
PLLA
[
a
|
r
1
3) $03 COLLECTOR |
4). 0604 COLLECTOR
2) @502 COLLECTOR []
I,
Sl
ie oe [ee
a ce ie
T Telolelalelelelalalvlel Tale le {time
0511,0512 and D513 OFF Period
O5I1 ON Period
OSI2 ON Period
‘$13. ON Period
5) D511 ANODE
Zam pee
te
t
6) 0512 ANODE
7) DS5t3 | ANODE
ota
| 1
OOHOHORY
LEFT RIGHT
Figure 10 FWD-APSS IND. TIMING CHART
(2) MUTING CIRCUIT (Refer to Figure 12)
The
current
fed
to
the
muting
circuit
turns
“ON”
the
muting
transistor
(Q302
and
Q305)
and
attenuates
the
signal
from
head
to
hold
back
the
monitor
noise.
APSS DETECTION CIRCUIT
(Refer to Figures 13, 14 and 15)
The current fed to the APSS detection circuit drives the
tape playback signal given from the record/playback head
into the APSS pre-amp (IC401) through the equalizer amp
(Q201 to Q204) and APSS mixer (Q205), turning “ON”
the Q401, and now the signal is amplified to exceed VBE
(voltage between base and emitter) and charges the C406
up to +12 volts.
Next, when the Q402 is turned “ON”, the Q403 is turned
“OFF”, and the potential of the Q403 collector stabi-
lizes at +12 volts. Therefore the Q404 is not turned “ON”,
in consequence, neither is the Q405. As a result, the
plunger is not actuated. In other words, as far as the tape
carries signals the plunger does not work, that is, the tape
is continuously fast forwarded according to the mechanism
of the APSS. Meanwhile, when there is no signal on the
tape, the potential, even if amplified by the equalizer amp
(Q201 to Q204) and APSS pre-amp (IC401), becomes
lower than VBE of Q401, which, therefore, is turned
“OFF”, and the electric charge of C406 (determined
by the value of R405 and C406) is discharged at the time
constant. When the potential of C406 is discharged to be
below VBE of Q402, the Q402 is turned “OFF” and the
Q403 is activated. Therefore, the collector potential of
Q403 becomes zero (0) volt and, consequently, the +12-
volt voltage passes through the R412, allowing a discharge
current to flow towards the C407. By this discharge current
the potential of the Q404 base drops momentarily to
zero (0) volt, and the Q404 is turned “ON”.
tees
REV-APSS APSS INDICATOR PERIOD
an h
+) Q501 COLLECTOR |
MULTI-VIBRATOR] rer
2) 0502 COLLECTOR LI LU [|
padi oe
ty =
3) 9803 COLLECTOR LL
—j LN
FLIP-FLOP. m r
4) Q504 COLLECTOR
_ To
5) DSi! ANODE ] [|
sa
6) D512 ANODE | [ ]
—4$
7) DSI3 ANODE [| ‘|
i
F 4h;
[ Tololelalalefelatalele! lalele| time
--4a-, |
| DSI1,DSI2 ond DSIS OFF Period
Gb) REV) D513 ON Period
LEFT RIGHT DSI2 ON Period
DSII ON Period
Figure 11 REV-APSS IND. TIMING CHART
Q301,Q304
2S8C373
DIN AMP
Q302,Q305
2SC372(Y) MUTING
Roch C302 R308
10/16V wK
BUFFER PRE.
AMP. ae AMP.
APSS DET.
CIRCUIT
GROUND °
V V V
R/P SWITCH (SW2OI-K,1)
Figure 12 MUTING CIRCUIT
{L602)
Q201,Q203 2SCIG82IGR)
EQ AMR: Ra);
0202,0204 te, > gurren
RECORD/PLAY BACK Seat
HEAD c204
APSS DET. CIRCUIT
28C373
MIXER
{> BUFFER
AMP.
DOIN SOCKET
(so202)
{L603}
Ae
Figure 13 EQ AMP.

Accordingly, the potential of the C407 is permitted to be
stabilized from zero (0) volt to +12 volts. When the
potential exceeds VBE, the Q404 is turned “OFF”. Then
the Q404 is turned “ON”’, and +B is supplied to the base
of Q405 through the R414, turning “ON” the Q405.
Then, an end of the plunger is grounded and +12V is
applied to the plunger, which, in turn, is actuated. When
the Q404 is turned “OFF”, the Q405 is also turned “OFF”’,
cutting off the potential to the plunger. When the plunger
is put in action, the APSS lockplate is stretched out to
release the FWD-APSS key. Consequently, the FWD-APSS
switch (SW501) is turned “OFF” and the pinch roller is
pressed hard against the flywheel shaft. Moreover, the
fastforwarding gear is disengaged from the gear of the
takeup turntable, setting the unit in normal playback
mode again. As the FWD-APSS switch (SW501) is turned
“OFF”, the light emitting diodes of D513, D512 and
D511 stops flickering and the APSS limiter circuit is
made inactive. Further, the muting circuit of Q302 and
Q305 also stops its function.
In the meantime, when the REV-APSS key is depressed
the fast-forwarding gear meshes with the gear of supply
turntable and the REV-APSS switch (SW502) is turned
“ON” to set the tape in rewind mode, permitting the
light emitting diodes of D511, D512 and D513 to flicker.
The successive function is just as in the case of FWD-APSS
behavior.
This ends the explanation of the APSS performance.
However, that the APSS may malfunction when either
one of following recordings is played back, but, remember,
this is not a trouble.
1.
2:
a
A prolonged portion of pianissimo in music.
A blank portion in the midst of music (more than 3 seconds
when measured in playback).
* In cases 1 & 2 the FWD-APSS or REV-APSS key,
if depressed, resets itself and regular playback mode
is resumed.
. A too short interval between programs (about 1 second
when measured in playback).
. Anoisy hum or buzz recorded in a blank portion.
* In cases 3 & 4 the condition doesn’t allow the APSS
circuit to work easily, and the blank portion couldn’t
be detected.
. FWD-APSS key depressed within 10 seconds (as measured
in playback) from the end of a preceding selection.
. REV-APSS key depressed within 10 seconds (as meas-
ured in playback) from the beginning of a selection.
* In cases 5 & 6 the tape runs 10 or 30 times as fast as in
playback mode if the FWD-APSS or REV-APSS key is
depressed, therefore the tape skips a blank portion
while the key is being depressed.
APSS MIXER MUTING CIRCUIT
[—————~1 APSS IND. CIRCUIT
I+12V
f——> PLUNGER ({SOLSOI)
R401 sepa
15K
c4or
022(Z) \C -40]
RH-IXO408AFZZ
Po R40:
age | ex | Binh
2
47K
ve ©.
+
C406 04
3.3/50V(M
OMP
A
02
)
© GROUND
Q401 2SA495(Y) Q402,Q403 2SC372Y(Y) Q404 2SA495(Y)
SWITCHING Q405 2SD468(C)
PLUNGER DRIV.
Figure 14 APSS DETECTION CIRCUIT
[mee APSS SW
sw501 |FwD. APSS Sw
(REV aPSS SW)
ON
(Sw502)| (REV. APSS_ SW)
OFF.
Voss a _ BLANK <.
MUSIC A SECTION MUSK B
H
EQUALIZER AMP.
(Q201- 0204) | ]
APSS MIXER(Q208) | \ |
' !
!
| |
APSS PRE
AMP (IC 401)
=e | TIME CONSTANT
| pT (R408 ,c406)
TERMINAL os
| VeE
VOLTAGE | | we :
nee
9401 =
(282L econ} 1 Ve
| |
| rt
i
( 9402 ) I
COLLECTOR |
ON |
ne | |
Sees
OFF |
(2403 ) :
COLLECTOR |
= fete SS
fe
(sate Laon)
i i
! it
1 =a
! if
0403 (Vee)
! i
|
|
\ 404(0N)}
|
! OFF
T tot
i
I
!
t
]
| OFF
i '
I !
¥ i
TAPE Hi 1
! NORMAL SPEED
SPEED | | x 10~ 30 are
: I
Refer to Figures 10,1!
( 0404 )
COLL ECTOR
PLUNGER
KE
APSS IND.
LAMP (LEO)
Figure 715 APSS MOVEMENT PRINCIPLE

MECHANICAL ADJUSTMENT
=
PLAY
ADJUSTMENT
OF
FLYWHEEL
SHAFT
THRUST
+.
(Refer to Figure 16)
1. Slowly rotate the flywheel shaft thrust play adjusting
screw clockwise until there will be no thrust play.
2. Next, rotate the thrust play adjusting screw about 1/4
of its full turn counter clokwise. (Since 1 pitch of the
adjusting screw refers to 0.8 mm, the thrust play thus
created becomes 0.1 mm to 0.3 mm.)
ADJUSTMENT SCREW
Ol mm
0.3mm
FLYWHEEL
Figure 16
@ PINCH ROLLER PRESSURE ADJUSTMENT
(Refer to Figure 17)
1. Set the unit in PLAY mode.
2. Push the point @ with use of tension gauge (0 gr. to
500 gr.) to make the pinch roller apart from the fly-
wheel shaft. Then, check that the tension gauge will
read 300 gr. to 400 gr. when the pinch roller stops to
rotate.
. As a result of the check in the step 2 above, if the
reading is found outside the range of 300 gr. to 400 gr.,
adjust the pressure spring of pinch roller by bending
it or replace.
WwW
PRESSURE SPRING
Figure 17
@ OPERATION CHECK OF FWD-APSS AND REV-APSS MECHANISMS
(Refer to Figures 42 and 43, Page 29 and 30)
Under PLAY mode, slowly push the FWD-APSS key or
REV-APSS key to make sure that the pinch roller (090)
and the take-up idler (028) come off respectively from the
flywheel shaft and the take-up turntable support (081),
and simultaneously the sub-chassis (011) moves 1 mm to
1.5 mm, and further that thereafter, the roller assembly
(089) is pressed against the take-up turntable support
(081) or the supply turntable support (082). Moreover,
when the FWD-APSS key or REV-APSS key is released
by pushing the FF (CUE) key or the REWIND (REVIEW)
key, make ascertain that the sub-chassis (011) is reset and
the unit gets in PLAY mode.

= TORQUE MEASUREMENT AT PLAY, FF AND REWIND MODES
(Refer to Figure 18)
1.
Mount
a
torque
measuring
reel
on
the
reel
support
(that
is,
it is
placed
on
the
take-up
turntable
support
at
PLAY/
REWIND
mode
while
on
the
supply
turntable
support
at
REWIND
mode).
2.
Then
gradually
release
the
tension
gauge
and
read
it
when
the
rotational
speed
of
the
reel
support
becomes
almost
constant.
3.
Measured
torques
at
each
mode
should
be
as
tabulated
below.
Note:When the take-up turntable support is stopped at
PLAY mode, there should be no slip between the
take-up turntable support and take-up slip roller
and/or between the drive belt and take-up slip roller.
TURN TABLE
MEASURING —__20(25/32")
REEL
TENSION
GAUGE
MEASURED TORQUE
35~ 60 gr.cm
70 ~ 100 gr.cm
70 ~ 100 gr.cm
REWIND
Figure 18
= GAP ADJUSTMENT BETWEEN MOTOR SWITCH AND BRAKE LEVER
(Refer to Figure 19)
1. Under each of PLAY, FF, and REWIND modes, make
ascertain that the motor switch (SW504) is turned “ON”
without fail.
2. When the motor is in a stop, check that the gap (A) between
the brake lever and the motor switch (SW504) is 2 mm to
3 mm.
3. If the steps 1 and 2 above are still insufficient for the
adjustment, the gap can be adjusted by positionally
changing the two soldered terminals of motor switch
(SW504) located at the motor PWB with use of a soldering
iron.
MOTOR SWITCH (SW504) __
BRAKE LEVER
OPERATION CHECK OF PAUSE MECHANISM
(Refer to Figure 42, Page 29)
Set the unit in PLAY mode by pushing the key given a mark
( <q ). Then slowly push the PAUSE key and make ascertain
that the take-up idler (028) and the pinch roller (090) come
off respectively from the take-up turntable support (081) and
the flywheel shaft almost at the same time and check that
each of the two gaps thus produced is about 0.5 mm.
TURNTABLE
Figure 19
@ ADJUSTMENT OF PLUNGER SETTING POSITION
(Refer to Figure 20)
1. Under FF mode, loosen the plunger retaining screw,
hold up the part @) of the plunger by hand and while
keeping the plunger in contact with the lock shaft,
retighten the plunger retaining screw.
2. After the step 1, make sure of the following.
«Check that each of the PLAY, FF (CUE), REWIND
(REVIEW) keys can be locked smoothly.
- Check that the FWD-APSS key and REV-APSS key
can be locked smoothly and they further be released
when the plunger operates.
- Check that the plunger can start to operate smoothly
when the STOP key is pushed to release the APSS
keys.
3. After the step 2, the adjustments are not yet sufficient,
again carry out the step 1.
PLUNGER ADJUST SCREW
LOCK SHAFT
PLUNGER _
Figure 20
10

ELECTRICAL MEASUREMENT
* This unit operaters on DC 12 V. Check that the power * Refer to Figure 35.
supply is exactly 12 V before measurement.
* Set the FUNCTION switch (SW101G) to “TAPE”
position.
m RECORD OSCILLATOR BIAS CURRENT AND BIAS FREQUENCY ADJUSTMENT
(Refer to Figure 21)
1. Connect the V.T.V.M. across the 100 ohm resistor 5. As a result of the check in the step 5 above, if the
(R201, R202). reading is found outside the 53 + 1 kHz, adjust the
2. Place the unit in RECORD mode. bias oscillation coil (L601)
3. Adjust the semi-variable resistores (VR601, VR602) 6. After the step 5, again make sure of the bias current.
so that the V.T.V.M. reads 50 mV for the right
channel (R201) and left channel (R202) respectively.
4. Make sure the record oscillator bias frequency is
53 + 1 kHz.
POSITION
A
NORMAL
AC V.TV.M.
FREQUENCY
COUNTER
GROUND
Figure 21
m ERASE CURRENT CHECK
(Refer to Figure 22)
1. Connect the V.T.V.M. across the 1 ohm resistor
(R603).
2. Place the unit in RECORD mode.
3. Make sure the erase current is 90+ 20 mV.
SWITCH POSITION
BIAS (SW602) NORMAL
ERASE HEAD
AC V.TV.M,
RECORD mode
Figure 22
11
m RECORD AMPLIFIER SENSITIVITY CHECK
(Refer to Figure 23)
1. Connect the V.T.V.M. across the 100 ohm resistors 4. Place the unit in RECORD mode.
(R201,
R202).
5.
If
the
record
amplifier
sensitivity
is
normal,
the
2. Short circuit the primary coil of the oscillation reading on V.T.V.M. should be approximately
coil (L601) to stop bias oscillator. 1.75 mV.
3. Connect the signal generator to the EXT. MIC jacks
(J201, J202) and apply signals (1000 Hz, —78 dB)
MODE (SW303) STEREO
to the unit.
SWITCH POSITION VR CONTROL | POSITION
ALC/MANUAL (SW202) | MANUAL RECORD (VR201) |
EQ
Gw203)
NORMAL
RECORD
(VR202)
rarer
BIAS (SW602) NORMAL
R/P HEAD
AC V.T.V.M.
MIC JACK —-- RECORD mode
ceeea GENERATOR (J201,J202) - STOP BIAS OSC.
-78dB
ATTENUATER
(0 dB = IV)
Figure 23
m PLAYBACK AMPLIFIER SENSITIVITY CHECK
(Refer to Figure 24)
1. Connect load resistor (4 ohm) to the EXT. SP sockets
(SO301, SO302) and further connect the V.T.V.M.
3. Place the unit in PLAYBACK mode.
4. If the playback amplifier sensitivity is normal, the
thereto. reading on the V.T.V.M. should be approximately
2. Connect the signal generator across the REC/PB 0.5 V.
head and apply signals (1000 Hz, —80 dB) to the
unit.
SWITCH POSITION POSITION
EQ (SW203)
MODE (SW303) STEREO
Mechanical
TREBLE (VR302) ee
Center
BASS (VR303)
R/P HEAD
AC V.TV.M.
EXT. SP
* PLAYBACK mode (S030! ,302)
SIGNAL GENERATOR
lOOOHz
-80dB
ATTENUATER
O
GROUND GROUND
(OdB = IV)
Figure 24
12

ws SWING ADJUSTMENT OF VU METER
(Refer to Figures 23 and 25)
1. Apply signals (1 kHz, —60 dB) to the EXT. MIC
jacks (J201, J202).
2. Adjust the record volume controls (VR201, VR202)
so that the V.T.V.M. reads 3.5 mV.
3. Rotate the semi-variable resistors (VR305, VR306)
to adjust so that each of the two VU meters (ME1,
ME2) indicates around “0” VU and swings to the
same extent in right and left of the position ‘‘0” VU.
™ RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
(Refer to Figure 26.)
1. Connect load resistor (4 ohm) to the EXT. SP sockets
(SO301, SO302) and connect outputs of both the
right and left channels to the vertical and horizontal
input terminals of oscilloscope.
2. Insert the test tape (MTT-114, 10 kHz, —10 dB
Recorded).
3. Place the unit in PLAYBACK mode.
4. Adjust the head azimuth adjusting screw so that
Lissajou’s waveform attains the maximum and the
same phase in right and left.
Figure 25
5. Even without using the oscilloscope, also adjust the
head azimuth adjusting screw so that outputs of
both the right and left channels attain the maximum
and the same phase in right and left, and as a result,
the output won’t be decreased so much considerably
even when the MODE switch (SW303) is set to
“MONO”.
SWITCH POSITION
MODE (SW303) | STEREO
EXT. SP
*PLAYBACK mode (SO302)
AC V.T.V.M.
VR CONTROL
VOLUME (VR301)
TREBLE (VR302)
BASS (VR303)
POSITION
Maximum
Mechanical
Center
OSCILLOSCOPE
Figure 26
13

Should it become necessary at any time to check the
alignment of this receiver, proceed as follows;
1. Set the volume control (VR301) to maximum.
2. Attenuate the signals from the generator enough to swing
the most sensitive range of the output meter.
3. Use a non-metallic alignment tool.
GENERAL ALIGNMENT INSTRUCTION
4. Repeat adjustments to insure good results.
5. Set the
position.
THE INSTRUCTION OF FREQUENCY ADJUSTMENT
(GF-9090H, HB)
In order to comply with FTZ rule: Nr. 358/1970, please
fix the low end of dial frequency (87.5MHz) and the high
end of dial frequency (107.9MHz) on FM band, by adjust-
FUNCTION switch (SW101G) to “RADIO”
ing oscillation coils (L3 and L4) and oscillation trimmer
(TC4), respectively, as illustrated in Fugure 35.
AM ALIGNMENT CHART
SIGNAL GENERATOR
RECEIVER
t
CONNECTION TO
RECEIVER
INPUT SIGNAL
REQUENCY
DIAL SETTING
REMARKS
(Refer to Figure 35)
ADJUSTMENT
Refer to Figure 27
Band
Refer to Figure 28
Exactly 455 kHz.
(400 Hz, 30%, AM
modulated)
Exactly 510 kHz.
(400 Hz, 30%, AM
modulated)
Coverage
Same as step 2.
L
Same as step 2.
Exactly 1650 kHz.
(400 Hz, 30%, AM
modulated)
High end of dial.
(minimum capa-
city)
Low end of dial.
(maximum capa-
city).
High end of dial.
(minimum capa-
city).
Adjust for
maximum
output.
Adjust for
maximum
output.
Exactly 600 kHz.
(400 Hz, 30%, AM
modulated)
600 kHz.
Same as step 2.
Adjust the AM
IF transformers
(T101)
(T102)
Adjust the MW
oscillation coil (L9).
Adjust the MW
oscillation trimmer
(TC107).
Same as step 2.
Adjust the MW
antenna coil (L7).
(See Note A)
Tracking
Same as step 2.
Exactly 1400 kHz.
(400 Hz, 30%, AM
modulated)
1400 kHz.
Same as step 2.
Adjust the MW
antenna trimmer
(TC104).
(See Note A)
Repeat steps 2, 3, 4, and 5 until no further improvement can be made.
Same as step 2.
Exactly 145 kHz.
(400 Hz, 30%, AM
modulated)
Low end of dial.
(maximum capa-
city)
Same as step 2.
Adjust the LW
oscillation coil
(L10).
Band
Coverage
Same as step 2.
Exactly 295 kHz.
(400 Hz, 30%, AM
modulated)
High end of dial.
(minimum capa-
city)
Same as step 2.
Adjust the LW
oscillation trimmer
(TC108).
Same as step 2.
Exactly 160 kHz.
(400 Hz, 30%, AM
modulated)
160 kHz.
Same as step 2.
Adjust the LW
antenna coil (L7).
Tracking
Same as step 2.
Exactly 260 kHz.
(400 Hz, 30%, AM
modulated)
260 kHz.
Same as step 2.
Adjust the LW
antenna trimmer
(TC105).
Repeat steps 7, 8, 9 and 10 until no further improvement can be made.
Band
Refer to Figure 29
Exactly 5.85 MHz
(400 Hz, 30%, AM
modulated)
Low end of dial.
(maximum capa-
city)
Same as step 2.
Adjust the SW
oscillation coil
(L8).
Coverage
Same as step 12.
Exactly 18.5 MHz.
(400 Hz, 30%, AM
modulated)
14
High end of dial.
(minimum capa-
city)
Same as step 2.
Adjust the SW
oscillation trimmer
(TC106).

an,
sete.
Same as step 12. Exactly 6.5 MHz.
(400 Hz, 30%, AM
modulated)
Same as step 2. Adjust the SW
antenna coil (L6).
Same as step 12. Exactly 16 MHz
(400 Hz, 30%, AM
modulated)
Same as step 2. Adjust the SW
antenna trimmer
(TC 103).
Note A|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
Repeat steps 12, 13, 14 and 15 until no further improvement can be made.
output, loop requires less inductance. Change loop in-
ductance by sliding the bobbin toward the center of ferrite
core to increase inductance, or away to decrease inductance.
output, loop requires more inductance. If brass increases
MW Switch (SW101B): ON
OSCILLOSCOPE
MW/LW
TEST LOOP) = BaR ANT.
SWEEP GENERATOR
AM IF
AMPLIFIER
SWEEP TRIGGER VW
Figure 27 AM IF ALIGNMENT EQUIPMENT CONNECTION
MW — MW Switch (SW101B): ON
LW — LW Switch (SW101A): ON
SIGNAL BAR ANT.
GENERATOR TEST LOOP (MW/ LW)
Figure 28 MW/LW RF ALIGNMENT EQUIPMENT CONNECTION
SW Switch (SW101C): ON
I To TEST POINT (TP)
c
S
R=30 ohm
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Z=50 ohm
eceto PF
Me
Z:
Output
impedance
of
signal
generator
AC
VLVM.
SIGNAL
WF
TO
CHASSIS
GROUND
(TP1O)
GENERATOR EXT. SP
GROUND
Figure 29 SW RF ALIGNMENT EQUIPMENT CONNECTION
15

FM ALIGNMENT CHART
(Refer to Figure 35)
RECEIVER
SIGNAL GENERATOR
CONNECTION TO
RECEIVER
INPUT SIGNAL
REQUENCY
TEST STAGE
DIAL SETTING REMARKS
ADJUSTMENT
Refer to Figure 30 Exactly 10.7 MHz.
(400 Hz, 30%, FM
modulated)
High end of dial.
(minimum capacity)
Adjust for
maximum output.
Adjust the FM
IF transformers
1.(T1)
2. (T2)
Low end of dial.
(maximum capacity)
Refer to Figures 31
and 34
Exactly 87.1 MHz
(400 Hz, 30%, FM
modulated)
Adjust for
maximum output.
Band
Adjust the FM
oscillation coils
(L3, L4).
Coverage
Same
as
step
2.
Exactly
108.5
MHz.
(400
Hz,
30%,
FM
modulated)
High end of dial.
(minimum capacity)
Same as step 2.
Adjust the FM
oscillation trimmer
(TC4).
Same as step 2. Exactly 88 MHz. 88 MHz
(400 Hz, 30%, FM
modulated)
Same as step 2.
Adjust the FM
RF coils (L1, L2).
Tracking | same as step 2. Exactly 108 MHz. | 108 MHz
(400 Hz, 30%, FM
modulated)
Same as step 2.
Adjust the FM
RF trimmer (TC 3).
Repeat steps 2, 3, 4 and 5 until no further improvement can be made.
OSCILLOSCOPE
10.7 MHz , 400Hz
FM SWEEP GENERATOR
FM IF
AMPLIFIER
O
TP 102
GROUND
O
TP2
GROUND
SWEEP TRIGGER“VAYY
Figure 30 FM IF ALIGNMENT EQUIPMENT CONNECTION
FM Switch (SW101D):ON |
FM SIGNAL
GENERATOR (Fig 54)
DUMMY EXT. SP
(SO30I, 302)
GROUND
AC V.T.V.M.
Figure 31 FM RF ALIGNMENT EQUIPMENT CONNECTION
16

(Refer to Figure 32)
There are Skinds of ceramic filters (CF101, CF102)
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 using them,
be sure to make the two of the same type a pair.
When other ceramic filters 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.
10.64
MHz
+
30
kHz
Central 10.67 MHz + 30 kHz
frequency ; 10.70 MHz + 30 kHz
(fo) Orange: 10.73 MHz + 30 kHz
White: 10.76 MHz + 30 kHz
Figure 32
FM MPX ALIGNMENT CHART
* P.L.L. (Phase Locked Loop) : Refer to service manual of model RG-5300, E (Page 7 ~ 10).
SIGNAL GENERATOR RECEIVER
CONNECTION TO INPUT SIGNAL
RECEIVER FREQUENCY
DIAL SETTING REMARKS ADJUSTMENT
Adjust for 19 +0.1 kHz. | Adjust the semi-variable
Refer to Figures 33 and 34 Exactly 98 MHz (54 dB) 98 MHz
resister (VR1)
un modulated.
FM Switch (SW101D) : ON
MODE
(SW303)
:
STEREO
FM STEREO (Fig.34)
SIGNAL _GENERATOR DUMMY
FREQUENCY
COUNTER
GROUND
Figure 33 FM MPX ALIGNMENT EQUIPMENT CONNECTION
TO TEST POINT (TP!)
Rl= 37.5 ohm
poeeam ees ohm
R1I=50 ohm
ogo < R2=50 ohm
TO CHASSIS GROUND (TPIO)
Z: Output impedance of signal generator
Figure 34 FM DUMMY
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18

NOTES
1) FREQ. RANG LW 150 ~ 285 kHz, MW 520 ~ 1620 kHz
SW 5.95 ~ 18MHz, FM 87.6 ~ 108 MHz
2) 1 F LW/MW/SW 455 kHz, FM 10.7 MHz
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