Technics SA-GX230 User manual

()
AV Control Stereo Receiver
Service Manual
ORDER NO. AD9206177C2
Receiver
SA-GX230
Colour
Area
SPECIFICATIONS (DIN 45 500)
lI AMPLIFIER SECTION
Power output
DIN 1 kHz (T.H.D. 1%) 2x80 W (4 Q)
40 Hz~20 kHz continuous power output
both channels driven 2x50 М (80)
Total harmonic distortion.
rated power at 40 Hz~20 kHz - : 0.5% (8 О)
half power at 1 kHz
Intermodulation distortion
rated power at 60 Hz: 7 kHz—4:1, SMPTE
Power bandwidth
both channels driven, —3 dB
0.5% (8 О)
10 Н2--40 kHz (8 О)
Damping factor 40 (8 Q)
Input sensitivity and Impedance :
PHONO 3 mV/47 КО
CD, VCR 1 200 mV/22 КО
. VCR2, TAPE . 200 mV/22 kQ
PHONO maximum input voltage (1 kHz, AMS): 150 mV
S/N at rated power (8 ©) .
70 dB (ІНЕ, А: 80 dB)
РНОМО
CD, VCR 1 80 dB (IHF, A:90 dB)
VCR 2, TAPE 80 dB (IHF, A:90 dB)
Frequency response |
РНОМО RIAA standard curve
| +0.8 dB (30 Hz~15 kHz)
CD, VCR 1 10 Hz~40 kHz (+3 dB)
VCR 2, TAPE 10 Hz~40 kHz (+3 dB)
Tone controls |
Bass . 50 Hz, +10 dB— —10 dB
Treble 20 kHz, +10 dB— — 10 dB
Loudness control (volume at —30 dB) 50 Hz, +9 dB
Output voltage
VCR 1 OUT 200 mV
TAPE REC (OUT) 200 mV
Channel balance, 250 Hz~6.3 kHz +1 dB
Channel separation - . 55 dB
Headphones output level and impedance 430 mV/330 Q
Load impedance
40-160
80—16 Q
А ог В
А апа В
Technics
0.03% (8 Q) .
Suffix for
E ж
(ЕС) Germany and Italy. (К) (5)
ll FM TUNER SECTION
Frequency range
Sensitivity
SIN 30 dB .1.5 uV (75 Q)
SIN 26 dB 1.3шУ (75 О)
SIN 20 ав _ | 1.2uV (75 О)
IHF usable sensitivity 1.5 uV (IHF'58, 75 О)
ІНЕ 46 dB stereo quieting sensitivity . 22 uV/75 О
Total harmonic distortion
MONO . 0.2%
STEREO | 0.3%
S/N m ; cd
MONO 60 dB (75 dB, IHF)
STEREO 58 dB (71 dB, IHF)
Frequency response
20 Hz~15 kHz, +1 dB— —2 dB
Alternate channel selectivity i
87.50~108.00 MHz -
+400 kHz 65 dB -
Capture ratio 1.0 dB
Image rejection at 98 MHz 40 dB
IF rejection at 98 MHz 70 dB
Spurious response rejection at 98 MHz 70 dB
AM suppression 50 dB
Stereo separation
_1kHz -— 40 dB
Carrier leak
19 kHz —55 dB (—60 dB, IHF)
38 kHz —50 dB (—55 ав, ІНЕ)
Channel balance (250 Н2--6.3 06 + 1.5 ав
Limiting point 1.2 uV
Bandwidth
IF amplifier 180 kHz
FM demodulator 1000 kHz
Antenna terminals 75 О (unbalanced)

SA-GX230 |
ШАМ TUNER SECTION Ш GENERAL
For (E/EB) areas. Power consumption | | 260 М
Frequency range du 4 Power supply
MW 522 kHz--1611 kHz (9-kHz steps) For (E, EB) areas. AC 50 Hz/60 Hz, 230 V/240 V
‚ 530 kHz—1620 kHz (10-kHz steps) For (EG) area. КЕ АС 50 Н2/60 Hz, 230 V
LW 144 kHz~288 kHz Dimensions (W x H x D) 430 x 125 x 305 mm
Sensitivity (S/N 20 dB) | Weight 7 kg
MW бо 20 uV, 330 uV/m |
LW 45 ыу
Selectivity (--9 kHz) : Ш REMOTE CONTROL TRANSMITTER
MW (at 999 kHz) : 55 dB |
LW (at 252 kHz) 55 dB Control keys 32 keys
Image rejection - Dimensions (W x H x D) 70х27х 175 mm
MW (at 999 kHz) и. 40 dB Weight (including batteris) 1254
LW (at 252 kHz) 40 dB Power source Two UM-4
IF rejection | (Panasonic ROS/LROS or equivalent)
MW (at 999 kHz) 55 dB
LW (at 252 kHz) 55 dB Notes:
For (EG) area. 1. Specifications are subject to cahnge without notice.
Frequency range 522 КН2--1611 kHz (9-kHz-Schritte) | Weight and dimensions are approximate.
530 kHz--1620 kHz (10-kHz-Schritte) 2. lota! harmonic distortion is measured by the digital spectrum
Selectivity (S/N 20 ав) | 20 uV, 330 uV/m analyzer. ж.
Selectivity at 999 kHz - 55 dB :
Image rejection at 999 kHz 40 dB тш
IF rejection at 999 kHz 55 dB
Ш CONTENTS
Page Page
АССЕЗЗОШЕЗ пиков ыы бырына ым» 2 PRINTED CIRCUIT ВОАНВВ........................................... 27--32
ВЕРОВЕ ОЗЕ —Ó———— 2 WIRING CONNECTION ШАСВАМ................................... 33
REAR PANEL TERMINALS AND FUNCTIONS........................ 3,4 TERMINAL GUIDE OF IC’S, TRANSISTORS AND DIODES ..... 34
FRONT PANEL CONTROLS AND FUNCTIONS ...................... 5, 6 INTERNAL CONNECTION OF FL ........................--- а.а 35
REMOTE CONTROL ОРЕБАТІОЬҺ.......................гг.2л.2.2.444Ү.7Һ/..М..) 7,8 TERMINAL FUNCTION OF IC...................... „нннеее 36
DISASSEMBLY INSTRUCTIONS ............................... eese 9~12 CABINET PARTS LOCATION .....c..ccsssssecsessesessrsseserssssseracssosee 37, 38
MEASUREMENTS AND ADJUSTMENT S......................--- 13 REPLACEMENT PARTS 116Т....................2...1...)ц1 (2.2.2.2. . 39--42
BLOCK DIAGRAM, с-сы рыны сынын 14--16 RESISTORS AND CAPACITORS ........................--- e eere. 42--44
SCHEMATIC DIAGRAM, .................................... 1... а raura 17--26 PACKAGING peee-———————————— 44
Ш ACCESSORIES
• АС power supply cord... 1 pc. • ЕМ indoor antenna * AM loop antenna * AM anntena holder
ene K (E, ES] (RSA0007) 1 pc. (SPB1163T) Я (SMA231M) n —
SJA193 (EB) ==
Au
• Screws е Remote-control transmitter е Batteries e Attachment plug
(XTN3+ 10AFZ) 2 pcs. (RAK-SA302E) 5 (UM-4/RO3) (SJP9009): (EB) only .... 1 pc.
N for Remote control unit
eS
Ш BEFORE USE | | | =
| wu
Be sure to disconnect the mains cord before adjusting the Note that this unit will be seriously damaged if this setting is not
voltage selector. made correctly.
Use a flat-tip (—) screwdriver to set the voltage selector (on the
rear panel) to the voltage setting for the area in which the unit will
be used.

| SA-GX230
Ш REAR PANEL TERMINALS AND FUNCTIONS 5 Ѕіегео connection doble _ © “TAPE” terminals „^ . ... Ф Cooling fan
(not included) Connect a tape deck. The cooing fan operates at i output power levels only.
Caution: White (L)
Do not place books, etc., on top of this unit so that the heat radiation vents remain unblocked. Red (R) бла) са
. This unit TAPE.
| ет PLAY (IN)
Speaker connection terminals
(D( (AD
Stereo connection
cables = "E |
(not included) ` | | (9) Voltage selector(VOLT ADJ): for (Е, EB) areas
| ~- Set the voltage selector to the voltage setting for the area іп
(R(D dR | which the unit will be used.
Tape deck | 2 [Use a minus (-) screwdriver]
(not included)
3 е
LINE
IN
LINE
OUT
This
unit
© Remote control OUT terminal
| |
Note:
|
|
| |
l
(REMOTE
CONTROL
OUT)
|
|
Note
that
this
unit
will
be
seriously
d
т .
-
»
| |
у
amaged
if
this
setting
is
not
(D
Antenna
connection
terminals
_
@
“VCR
1"
terminals
.
ща
This
terminal
can
be
used
only
with
Technics
components
made
correctly.
Connect
a
VCR.
А
which
have
the
appropriate
remote
control
terminal.
| ;
(See
the
operating
instructions
of
the
VCR.)
|
(Consult
your
dealer
for
details.)
(2)
“PHONO”
terminals
|
Proper
connection
with
remote
control
connection
cables
Connect
a
йай
odi
Do
not
йе
ыл
This
unit
SJP2257T
will
allow
conirol
of
some
functions
from
this
|
у.
у
|
unit’s
remote
control
transmitter.
(See
pages
7—8
for
“VIDEO
OUT”
terminal
source
to
these
terminals.
ai
:
;
details.)
Connect
a
video
connection
cable
(not
included)
to
the
video
cope
input
terminal
of
the
nem
connected
to
the
"VCR
1”
ter-
@
_
This
unit
mR)
во
Connect
to
a
tape
deck
and/or
compact
disc
player
as
shown
minals.
|
-
||
below.
.
57
When
this
connection
is
made,
tape-to-tape
recording
(audio
|
ыгы
|
|
:
ae
|
and
video)
can
be
carried
out
simply
by
connecting
a
video
Stereo
connection-|.—
,
=
|
If
аре
deck
is
not
being
used,
the
compact
disc
player
сап
camera
or
second
VCR
(for
playback)
to
the
“VCR
2”
ter-
cables
|
|
be
connected
directly
(dotted
line).
|
minals
of
this
unit.
Е | p (not included)
Stereo connection : Ground wire
cable (not included)
(not included)
"9D
OR
2%.
T
VCR
This
unit
This
unit
(not
REMOTE
`
|
d
>
a
:
©
- included) AUDIO puno
Ọ VIDEO OUT
Connection cable
for remote control
- (Included with tape
‘Video connection
cable
(not included)
Turntable
(not included) OUTPUTOÓ © © |
Video connection
- cable
%
l 4
Ту
(not included)
Tape deck |
(not. included)
(not included) |
@ “CD” terminals |
Connect
a
compact
disc
player.
VCR
Connection
cable
|
(not
included)
‚
©
VIDEO
IN
for remote control
(Included with
compact disc
player)
This unit
f
i
i
t
t
!
!
1
1
1
I
І
Ц
V
Compact disc
player
(Т)
ЭК
(not
included)
REMOTE
Stereo connection —
cable
(1) AC IN socket (AC IN)
(not included)
Note:
| Рог а compact disc player with a remote control sensor the
e compactat г 2” а 4 | 2 24 above connection is not necessary.
h player Í Е | - 2. |
(not included)
= 3 “= = TM 4 —

| SA-GX230 SA-GX230 | |
Ш FRONT PANEL CONTROLS AND FUNCTIONS
Tuner section
(D (2)
CJARIZ LOCK MEMORY Е sr
MUTING
cuc 28 1000455
(D Power “ © STANDBYI/ON” switch
(POWER, (2 ЗТАМОВУ/ОМ)
This switch switches ON and OFF the secondary circuit
power only. The unit is in the “standby” condition when this
switch is set to the Ф STANDBY position. Regardless of the
switch setting, the primary circuit is always “live” as long as
the power cord is connected to an electrical outlet.
Remote control signal receptor
(REMOTE SENSOR) : |
Receives the signals from the remote control.
“STANDBY” indicator (STANDBY)
This indicator illuminates when the "STANDBY" mode is set
by the main unit or the remote control transmitter.
Channel display
This display shows the channel number selected by one of
the preset-tuning buttons.
Also this display shows the channel number for about 3
seconds during memory scan operation.
Quartz-lock indicator (QUARTZ LOCK)
This indicator illuminates when the unit is tuned precisely to
a broadcast station.
(6 Memory indicator (MEMORY)
This indicator illuminates when the memory button is press-
ed.
@ FM stereo indicator (FM ST)
This indicator automatically illuminates when an FM stereo
broadcast is being received.
Note:
It will not illuminate if the FM mode selector is set to the
monaural mode.
Memory scan indicator (M. SCAN)
This indicator illuminates when the memory scan button is
pressed.
FM $400€ N LOUONESS BALANCE
AUTO:MONO « “он LEFT — AGHT УСО — L AUDIO Ч A—VCA2
\ Ғе
үз ees — |іог (EG) area
| |" me |
(8) 16) а MERECE NNUS 4
Band indicators (FM, LW, MW): for (E, EB) areas
(FM, AM)
Indicates the selected band.
: for (EG) area
Input selector/frequency display
(INPUT SELECTOR/FREQUENCY)
Displays the selected source or broadcast frequency. .
Memory scan button (MEMORY SCAN)
This button is used to locate a desired broadcast station;
each broadcast station is selected for about 3 seconds.
Tuning buttons (TUNING)
These buttons are used for tuning to the desired broadcast
station.
Memory button (MEMORY)
This button is used when presetting broadcast station fre-
quencies into memory.
Preset-tuning buttons (1—0)
(30 CHANNEL RANDOM PRESET TUNING)
These buttons are used to preset broadcast frequencies into
the memory of this unit and to recall the desired то sta-
tions.
Band selectors (FM, LW, MW): for (E, EB) areas
(FM, AM) : for (EG) area
FM: Press this button to listen to an FM broadcast.
LW: Press this button to listen to an LW broadcast.
MW (E, EB)/AM (EG): Press this button to listen to an
MW/AM broadcast.
ALLOCATION: When the MW/AM button is pressed for
about 3 seconds, the MW frequency step will change to
10 kHz per set. (This step is set to 9 kHz before shipment.)
In order to return to the original frequency indication, press
this button for about 3 seconds again.
FM mode selector (FM MODE)
This unit automatically switches to the stereo mode when an
FM stereo broadcast is received. This selector is used to
select the mode (stereo or monaural) of FM broadcast
signals.
---- 3
Amplifier section .
for (EG) area
(D Speaker selectors (SPEAKERS)
These selectors are used to select the speaker system(s) (A
and/or B).
Muting indicator (MUTING)
This indicator will illuminate when the muting button (on the
remote control transmitter) is pressed.
Loudness indicator (LOUDNESS)
This indicator will illuminate when the loudness button is
pressed.
@ Tape indicator ( )
This indicator will illuminate when the tape-monitor button is
pressed. : |
© Volume control (VOLUME)
Tone controls (BASS, TREBLE)
The bass control is used to adjust the low-frequency sound
range, and the treble control is used to adjust the high-fre-
quency sound range.
(D Headphones jack (PHONES)
Input selector buttons
These buttons are used to select the sound source to be
heard, such as a disc, radio broadcasts, etc. The selected
sound source is shown on the input selector/frequency
display.
The “PHONO” input selector has two functions: when press-
ed momentarily it selects “PHONO”. When pressed and held
for about 4 seconds, it de-activates the muting function.
= TONE CONTROL.
TREBLE
loo
(9 Tape-monitor button (TAPE MONITOR)
Press this button to listen to a tape.
To listen to some other source, press this button once again
(so that the indicator is switched OFF).
Loudness button (LOUDNESS)
Set to the “ON” position (the loudness indicator will il-
luminate); when listening to music at low volume. Auditory
perception of sound in the low frequency range falls off at
low volume, but when the switch is in this position, this defi-
ciency is compensated for, so that the full impact of tha
musical performance can be enjoyed.
й) Balance control (BALANCE)
(2 “VCR 2” terminals (VCR 2)
These terminals are used for tape-to- -tape recording if a se-
cond VCR is connected here.

Ш REMOTE CONTROL OPERATION
* This remote control transmitter can be used for control of a
Technics cassette tape deck or a compact disc player with a
remote control terminal.
Consult your dealer for details.
e For detailed information concerning operation steps, etc.,
please refer to the appropriate page for each unit and the
respective operating instructions.
® For this system, you can listen to tapes or compact discs, etc.,
by operating the remote control transmitter without using this
unit's input selectors. -
* Make sure that the power of each unit is set to the "ON" posi-
tion, before beginning the operations.
. Facing toward the main unit
TUNER CD
Bias E
1 5
ЕСЕН
с»
BE
REMOTE CONTROL TRANSMITTER
AUDIO
RAK-SA302E
Technics
| SA-GX230
[A][Tunercontrols ^ ^ ^ 1—
|
Press
this
button
first
to
use the
"OFF/ON"
button
or
the
[1]
—
[o]
buttons.
This button can be used for ON and OFF switching of this unit.
When switching the power ON and OFF, be sure to first press the
“TUNER” button.
[1] — [0]
Press these buttons to select the desired preset channel.
When these buttons are used, be sure to first press the "TUNER"
button.
To designate channels 1—9:
Press the appropriate (1—9) preset-tuning button.
Note: When selecting channel 1, 2 or 3 enter the selection "O1",
“02” or “03”. If only “1”, "2" or "3" is pressed, channel access
will be delayed by two seconds.
To designate channels 10—30:
(D Press the button for the “tens” digit (1, 2 or 3).
@ Press the button for the "units" digit (1-0) within 2 seconds
after pressing the first button.
Note:
If the interval between pressing the first button and pressing the
second button is more than about 2 seconds, the setting may not
be made correctly. n this Шы make the setting once again.
[B] [Tape deck controls ( Tape deck controls
|
Press this button to select the deck ("DECK 1” or "DECK 2") to
be controlled.
Press this button to change to the recording stand-by mode.
[<<], [>>].
Press one of these buttons to. advance. or rewind the tape while
the unit is in the stop mode.
Press one of these buttons to select the desired tune while the
unit is in the play mode. (Only applicable to a Technics tape deck
with the “music select” functions.)
Press this button to temporarily stop playback or recording.
Press the playback button to resume the playback or recording.
Press one of these buttons to begin playback or recording, press-
ing the button corresponding to the side of the tape to be played
back (or recorded).
> : For the “forward (А)" side of the tape
«4 : For the “reverse (В)” side of the tape
Note:
Depending on which Technics tape deck is used in combination
with this unit, tape deck 1 might be the "A"-side playback-only
type.
Press this button to stop tape movement.
Note
Depending on which Technics tape deck is used in combina-
tion with this unit, the pause of the playback (and the recor-
ding), and the recording functions of tape deck 1 might not be
possible by using the remote control transmitter.

SA-GX230 |
Compact disc player controls
Press this button first to use the [1] — buttons.
= |
Press these buttons to select the desired track.
Playback begins from the track selected.
When these buttons are used, be sure to first press the "CD" but-
ton.
Tracks 1—9:
Press the appropriate numeric button с E à directly.
To select a two-digit track number over 10:
Press the c3 button the necessary number of time to select the
"tens" digit, and then one of the © — c buttons to select the
"units" digit.
E
If a Technics multi compact disc player is used in combination
with this unit, the disc to be played can be selected by first press-
ing this button and then pressing the appropriate numeric button
ТҮРЕН
Press this button to select the desired play made.
(“РВООНАМ” or "CONTINUE")
Press one of these buttons briefly to move the pick-up to the
-—
Е
beginning
of
а
specific
track.
TUNER
.
|
co
2
os
EZ] СС)
[>
PLAY]
2 3 5
Facing toward the main unit
Dv
:
ress this button to start play.
Press this button to stop play.
PROGRAM
MODE
Note:
ею C2 E
When operating a compact disc player with a remote control sen-
sor, face this remote contro! transmitter toward the remote con-
trol sensor of the compact disc player.
заь.
:
REMOTE CONTROL TRANSMITTER
AUDIO
RAK-SA302E
Technics
[р] Amplifier controls
Press this button to select the “VCR 1” input selector on the main
unit.
Press this button to temporarily reduce the volume level. —
The volume level is attenuated by 20 dB (approx. 1/10). TE
Press once again to return to the previous volume level.
Press one of these buttons to adjust the volume level.
— 8 —

| SA-GX230
Ш DISASSEMBLY INSTRUCTIONS
“ATTENTION SERVICER” |
e Some chassis components may have sharp edges. Ве careful when disassembling and servicing. | |
ҚАЙ Removal of the cabinet Neat Removal of the front panel ass’y
Procedure |
[m]
1. Remove the 2 flat cables (CN401, CN601).-
Front panel ass’y
Speaker switch
/ Headphones jack
B
2. Remove the 3 screws (0 — 9).
3. Remove the front panel ass'y in the direction of
arrow. :
How to remove the flat cable
1. Lift up the connector.
2. Pull out the flat cable. Flat cable |
E Connector
[А
- Procedure
1524
Tone control knobs Balance knob
1. Remove the 2 tone control knobs and a balance 2. Remove the 5 screws (Q — ©).
knob. |

SA-GX230 |
ЖЕЕ Removal of the volume P.C.B. 27 Removal of the FL drive P.C.B.
Procedure Volume knob Procedure |
12525 15256 e
FL Drive PC.B.
. Pull out the volume knob.
. Remove the nut.
. Remove the 1 screw (@). 1. Remove the 5 screws (Q — ©).
. Remove the volume P.C.B. in the direction of arrow. 2. Remove the FL drive P.C.B. in the direction of arrow.
P m
Ref.
No.
Removal
of
the
power
switch
P.C.B.
Ref.
No.
wW
and
Operation
P.C.B.
Removal
of
the
VCR2
P.C.B.
Procedure Procedure
12256
|
1228
Power switch P C.B.
|
е Remove the 13 screws (@ — Ф). е Remove the 2 screws (@, Ө).
| эчи
T Removal of the rear panel i ou Removal of the tuner P.C.B.
Procedure Procedure
1-9 Rear panel 19-10
1. Remove the 13 screws (Q — Ф).
2. Remove the 1 connector (CN651). 1. Release the 1 claw.
3. Remove the rear panel ín the direction of arrow. 2. Remove the tuner P.C.B. in the direction of arrow.

SA-GX230-
Ш
MEASUREMENTS
AND
ADJUSTMENTS
Note:
For
2201/2251
(AM
(MW/LW)
ANT
and
OSC
coil),
7202
(AM
(MWILWMIFT),
they
are
supplied
as
adjusted
parts.
|
So,
do
not
turn
the
cores
of
the
parts.
Н
is
not
necessary
to
adjust
the
AM
(MW/LW)
circuit.
* FM ADJUSTMENT
Control
positions
and
equipment
used
*
FM
signal
generator
(FM-SG).
*
Frequency
counter
*
Distortion
analyser
•
Choke
coil
(100pH)
*
DC
electronic
voltmeter
(DC
EVM)
*
Resistor
(100
kQ)
. Remove the motor cover by used © screwdriver.
(Refer to Fig. 3)
4. Remove the motor from, the fancasing.
Ref.
No.
Removal
of
the
power
supply
P.C.B.
ner
NO;
Removal
of
the
power
transformer
ner
No:
Removal
of
the
cooling
fan
motor
11
12
(main)
16
Procedure
Procedure
Procedure
o
12911
1911412
1->9->16
(Refer
to
Fig.
4)
5.
When
mounting
the
motor
fan,
align
the
fan
1.
Release the 3 claws in the direction of arrow and casing’s projection with the hole of.the fan motor.
remove the fan motor. (Refer to Fig. 1) |
2. Insert a screwdriver at the root of the cooling fan.
Force it out of the motor shaft. (Refer to Fig. 2)
transformer Cooling" fari
(main)
FM
MONO
DISTORTION
ADJUSTMENT
FM
SIGNAL
GENERATOR
CONDITION
.
Test
equipment
connection
is
shown
in
figure.
Modulation
. Set the unit to “FM” position.
.
Set
the
radio
frequency
display
and
signal
generator
to
100.10
MHz.
|
| |
о
T
.
Adjust
Т201
core
so
that
voltage
measured
in
signal
mode
is
OmV
(0+20mV)
in
300mV
range.
.
Adjust
T202
so
that
the
distortion
factor
of
Lch
is
minimized.
.
.
EM
ET
.
Repeat
step
4
and
5a
few
times.
—
.
Make
sure
that
the
distortion
factors
of
Lch
and
Rch
are
nearly
the
same
with
each
other to
minimum.
Power, supply PC. B.
1. Remove the 1 screw (@). |
2. Remove the 1 flat cable (CN702).
3, Remove the power supply P.C.B. in the direction of
arrow. 2 Ұй
|
Қай
Removal
of
the
regulator
transistor
|
Procedure
1-2-13
Remove the 2 screws (Ф, Ө).
Remove the 2 transistor holders.
Lift up the connector in the direction of arrow (D.
Remove the regulator transistor in the direction of
arrow ©).
Note:
Ref
№.
|
Check
of
the
main
P.C.B.
Procedure
|
swhen
checking
the
soldered
sur-
1—17
faces
of
main
P.C.B.
and
replacing
—
.
о
o
the
parts,
do
as
show.
X
f
Front
panei
аѕѕ?у
The
adjusting
screwdriver
used.
should
be
made
of
resin.
|
|
|
емей ай =
FM
MPX
VCO
ADJUSTMENT
FM
SIGNAL
GENERATOR
CONDITION
. Test equipment connection is shown in figure. Modulation
.
Set
the
unit
to
"FM
auto"
position.
|
.
Set
the
radio
frequency
display
and
signal
generator
ÉREGUENEY
to
100.10
MHz.
QU
ENNA
COUNTER
.
Adjust
VR301
for
19.00+0.03kHz
on
frequency
counter
reading.
—
.
> 3 i
па й
зі
: | X USING ALTERNATE SYSTEM
1.
Apply
stereo
signa!
from
generator
or
receive
the
stereo
broadcast.
|
2.
Adjust
VR301
until
stereo
indicator
lights
up.
%
-
®
—
©
:
Stereo
OFF
Cement
arm
of
VR301
as
shown
in
figure.
* When mounting the regulator transistor.
Apply
silicone
thermal
compound
(RFKX0002
or
equivalent)
to
the
rear
of
the
regulator
transistor.
Removal
of
the
main
P.C.B.
LET
Removal
of
the
power
IC
|
Procedure
Procedure
125259
152—910
position
- © : Stereo ON positlon
|
(indicator
lighting)
|
©: Adjust point of Pilot circult
1. Remove the 3 screws (Ф--Ө).
Rear panel
*
Adjustment
points
a.
а
Please
refer
to
tuner
P.C.B.
on
pages
27,
28.
TH
Teel
a
UEM
SD
SM
GNO E
44%
Y
—
[—— 750.
Unsolder
the
power
IC
FM
ANT
?
"
‚
1.
Remove
the
2
screws
(Ф,
Ө):
|
@
‚2.
Unsolder
the
power
IC.
BALANCED
TUNER
P.C.B.
Front panel ass!y
¢ When mounting the power IC.
1.
Remove
the
1
flat
cable
(CN702).
^A
Apply
silicone
thermal
compound
.
(RFKX0002
ог
2.
Remove
the
6
screws
(Q
—
OQ).
|
equivalent)
to
the
rear
of
the
power
IC.
3.
Remove
the
6
screws
(D—().
—
5.
Remove
the'chassis
ass’y.
4.
Remove
the
rear
panel
іп
the
direction
of
arrow..
6.
Reinstall
the
front
panel ass’y
to
the
main
P.C.B.
FM offset! FM МОНО
coll OISTORTION сон
—Hh-
|
—12—
|
ue
n
—
13—
[129]
[1202]
d
|
|
|
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|
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|
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|
|
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|

|
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|
|
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«гипс» FM OSC signal
REMOTE
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REMOTE CONTROL ц , *u— AM (MW/LW) signal
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dedu
=
шіні
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A
8
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FL
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|
г
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|
|
*(
)
indícates
Pin
No.
of
right
channel.
TRANSFORMER
|
|
;
.
2