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  9. Onkyo TX-7230 User manual

Onkyo TX-7230 User manual

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SERVICE
MANUAL
QUARTZ
SYNTHESIZED
|
TUNER
AMPLIFIER
MODEL
TX~7230
Silver
and
b:
SAFETY-RELATED
COMPONENT
WARNING!!
COMPONENTS
IDENTIFIED
BY
MARK
Z\
ON
THE
SCHEMATIC
DIAGRAM
AND
IN
THE
PARTS
LIST
ARE
CRITICAL
FOR
RiSK
OF
FIRE
AND
ELECTRIC
SHOCK.
REPLACE
THESE
COMPO-
NENTS
WITH
ONKYO
PARTS
WHOSE
PARTS
NUMBERS
APPEAR
AS
SHOWN
IN
THIS
MANUAL.
MAKE
LEAKAGE-CURRENT
OR
RESISTANCE
MEASUREMENTS
TO
DETERMINE
THAT
EX-
POSED PARTS
ARE
ACCEPTABLY
INSULATED
FROM
THE
SUPPLY
CIRCUIT
BEFORE
RETURN.
ING
THE
APPLIANCE
TO
THE
CUSTOMER.
i
mocels
TABLE
OF
CONTENTS
Spectiications
.
00
ce
ee
oe
2
Service
procédures...
2s
ee
poe
ee
3
Biock
diagrani
Amplifier
section.
«2.
ee
eee
4
Power
supply
section.
2...
0.
ee
4
Dynaznic
bass
ciretitusc0..
oo
oe
oe
4
Pune?
section)
oe
ee
5
Exploded
view.
2.22
ee
ee
6
Paris
list.
0
ee
ee,
Gy
ees
7
Circuit
description.
oe
ee
oe
8
Adjustment
procedures...
65.
oe
13
Pcb
view/list
Tuner
section
2
0.
ee
ee
ee,
15
Digital
section.
6.
ee
bye
ee
17
Aimplifier
section...
oe
21
Control
section...
ee
ee
25
Senematic
diagram
Jumer
section
3.
2k
eee
oe
19
AMD,
section
4.
lee
ee
ee,
2.
Block
diaprani
of
1Co
0
ee,
head
Packing
View.
2.
0
See
ee
ee.
2
TX~7230
SPECIFICATIONS
AMPLIFIER
SECTION
Power
Output:
Musical
Power
Output:
Continuous
Power
Output:
Total
Harmonic
Distortion:
IM
Distortion:
Damping
Factor:
Frequency
Response:
RIAA
Deviation:
Sensitivity
and
Impedance:
Phono
Overload:
Signal-to-Noise
Ratio:
Tone
Controls:
Loudness
(—30dB):
Subsonic:
TUNER
SECTION
FM:
Tuning
Range:
Usable
Sensitivity:
50dB
Quieting
Sensitivity:
Capture
Ratio:
Image
Rejection
Ratio:
IF
Rejection
Ratio:
Signal-to-Noisc
Ratio:
Selectivity:
AM
Suppression
Ratio:
Harmonic
Distortion:
Frequency
Response:
Stereo
Separation:
Tuning
Level(Hi/Lo):
Muting
Level:
Stereo
Threshold:
AM:
Tuning
Range:
Usable
Sensitivity:
Image
Rejection
Ratio:
IF
Rejection
Ratio:
Signal-to-Noise
Ratio:
Harmonic
Distortion:
GENERAL
Semiconductors:
Dimensions
(WX
HXD):
Weight:
40
watts
per
channel,
min
RMS,
at
8
ohms,
both
channels
driven,
from
20Hz
to
20kHz,
with
no
more
than
0.04%
THD.
2
x
85
watts
at
4
ohms,
1kHz
(DIN)
2
X
55
watts
at
8
ohms,
1kHz
(DIN)
2
x
55
watts
at
4
ohms,
1kHz
(DIN)
2
x
40
atwatts
ato
at
8
ohms,
1kHz
(DIN)
0.08%
at
rated
power
0.08%
at
1
watt
output
0.08%
at
rated
power
0.08%
at
1
watt
output
35
at
8
ohms
20
—
30,000
Hz
+
1
dB
20
—
20,000
Hz
+
0.8dB
Phono:
2.5mV/50
kohms
CD/Tape
Play:
150mV/50
kohms
Tape
Rec:
150mV/3.5
kohms
(phono)
180mV
RMS
at
1
kHz,
0.04%
THD
Phono:
85dB
(at
10mV
input,
A
weighted)
76dB
({HF
A-202)
CD/Tape:
95dB
(A
weighted)
80dB
(IHF
A-202)
Bass:
+
10dB
at
100Hz
Treble:
+
10dB
at
10kHz
+7
dB
at
70
Hz,
+5
dB
at
10kHz
~—6
dB
at
15
Hz
87.5
—
108.0
MHz
(SOkHz
steps)
Mono:
12.8dBf,
1.2uV,
75
ohms
1.0uzV
(S/N
26dB,
40kHz
Devi.)
75
ohms
DIN
Stereo:
18.0dBf,
2.2uV,
75
ohms
23uV
(S/N
46dB,
40kHz
Devi.)
75
ohms
DIN
Mono:
18.0dBf,
2.2uV
75
ohms
Stereo:
37.2dBf,
20uV,
75
ohms
1.5dB
85dB
90dB
Mono:
71dB
Stereo:
66dB
50dB
DIN
(+300kHz,
40kHz
dev.)
50dB
Mono:
0.15%
Stereo:
0.3%
30
—
15,000Hz
+
1.5dB
40dB
at
1kHz
30dB
at
100
—
10,000Hz
17.2dBf,
2uV
17.2dBf,
2uV
§22
—
1611kHz
(9kHz
steps)
30uV
40dB
40dB
40dB
0.8%
FETs:
7
TR:
37
ICs:
10
Diodes:
54
LEDs:
28
435
x
112
X
343
mm
17-1/8”
x
4-7/16”
X
13-1/2”
7.8
kg
17.2
Ibs.
Specifications
and
features
are
subject
to
change
without
notice.
SERVICE
PROCEDURES
1.
Replacing
the
fuses
For
continued
protection
against
fire
hazard,
replace
only
with
same
type
and
same
rating
fuse.
Circuit
no.
Partsno.
Description
F501,
F601
252076
3.15A-SE-EAK,
Primary
F902
252074
2A-SE-EAK,
Primary
F903,
F904
252078
5A-SE-EAK,
Secondary
F905
252070
1A-SE-EAK,
Secondary
‘2.
Replacing
the
lamp
This
unit
uses
the
lamp
listed
below.
Circuit
no.
Partsno.
Desciption
PL901
210064A
PL
6.3V,
250mA,
Dial
plate
illumination
3.
Removement
of
display
pc
board
@.
Remove
the
five
screws
holding
the
top
cover
and
chassis
(side
bracket:4
back
panel:
1),
and
remove
the
top
cover.
Remove
the
five
screws
holding
the
front
panel
and
front
bracket,
and
remove
the
front
panel.
Remove
the
two
screws
holding
the
switch
pc
board
and
front
bracket,
and
remove
the
switch
pc
board
of
U4.
Remove
the
four
screws
holding
the
holder
and
front
bracket.
Remove
the
display
pc
board
ass’y
from
the
four
nails
of
holder,
and
remove
the
holder.
Remove
the
two
knobs
(A805).
Remove
the
two
screws
holing
the
NAAF—2306
pc
Board
ass’y
and
center
bracket,
and
remove
the
NAAF—2306.
©
e
SO:
2.
@
dynamic
bass
expander
and
front
bracket,
and
remove
the
display
pce
board.
4.
Memory
Preservation
This
unit
does
not
require
memory
preservation
bat-
teries.
A
built-in
memory
power
back-up
system
preser-
ves
contents
of
the
memory
during
power
failures
and
even
when
the
unit
is
unplugged.
The
unit
must
be
plug-
ged
in
and
the
power
switch
turned
on
and
off
once
in
order
to
charge
the
back-up
system.
Note
that
since
this
is
not
a
permanent
memory,
the
power
switch
must
be
turned
on
and
off
a
few
times
each
month
to
keep
the
back-up
system
operable.
The
period
of
time
during
witch
memory
contents
are
preserved
after
power
has
last
been
turned
off
varies
depending
on
climate
and
the
location
and
placement
of
the
unit.
On
the
average,
memory
contents
are
protected
over
a
period
of
3
to
4
weeks
(a
minimum
of
2
weeks)
after
the
last
time
power
has
been
turned
off.
This
period
is
shorter
when
the
unit
is
exposed
to
very
high
humidity
or
used
in
an
area
with
an
extremely
humid
climate.
Remove
the
two
screws
holding
the
switch
of
F501
F601
Speaker
protection
fuse
F902
F904
F903
:
<G/W>
Pri.
=
TES
il
il
<G>
F901
<pjw>
F905
<G>
Second.
-
a7
A16
“n805)i
\
A805)ago6)
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(ur
27
G28)
TX-7230
BLOCK
DIAGRAM
—AMPLIFIER
SECTION—
TUNER
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BASS
TREBLE
VOLUME
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EQUALIZER
AMP
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SOURCE
INDICATOR
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co.
POWER
SPEAKER:
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AMP
PROTECTION
TAPE-1
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TAPE-2
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LEVEL
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SPEAKER
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—POWER
SUPPLY
SECTION—
To
FLUORESCENT
INDICATOR
TUBE
—DYNAMIC
BASS
EXPANDER—
OUTPUT
D521,
D522
RECTIFIER
FILTER
other
channel
i.
other
channel
In
earlier
super
base
systems,
only
the
frequencies
about
70Hz
were
boosted
by
about
4dB
to
expand
the
playback
frequ-
ency
response
to
enable
playback
of
the
super
low
region.
However,
when
there
was
no
input
signal,
the
above
frequency
response
resulted
in
deterioration
in
the
S/N
ration
in
the
70Hz
region.
This
problem
has
been
overcome
by
the
dynamic
bass
expander
where
the
70Hz
boosted
level
is
varied
according
to
the
input
signal
level.
That
is,
the
frequency
response
remains
flat
when
no
input
signalis
applied,
but
is
boosted
at
the
70Hz
region
to
the
specified
level
when
the
input
signal
exceeds
a
certain
level.
The
left
and
right
channel
input
signals
from
the
INPUT
terminals
are
mixed
by
Q523
and
pass
through
the
level
volume
and
filter
amplifier.
The
signal
is
rectified
by
D551
and
D552,
and
the
resultant
DC
component
control
signal
is
applied
to
the
gate
of
Q525.
When
the
input
signal
is
at
a
adequate
level,
Q525
is
turned
on
and
the
super
base
circuit
of
power
amplifier
is
controlled
by
the
input
signal.
BLOCK
DIAGRAM
—TUNER
SECTION—
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SWITCH
TX-7230
EXPLODED
VIEW
PARTS
LIST
REF.
NO.
PART
NO.
DESCRIPTION
REF.
NO.
PART
NO.
DESCRIPTION
REF.
NO.
PART
NO.
DESCRIPTION
Al
27110243
‘Front
bracket
ASOle
28322012A
Selector
knob
ass’y
Ul
18454502D
NARF-2302D,
Tuner
circuit
pc
board
A2
27190198A
Holder,
lamp
ASOIf
28322018A
Knob
ass’y
ass’y
A4
28133132A
Back
plate
A511
838430068
3TTB+6B(BC),
Tapping
screw
U2
18454503D
NADG,
2303D,
Digital
circuit
pc
board
AS
28130225B
Dial
plate
A601
27170198A
Bottom
board
ass’y
A6
27190358A
Holder
A602
27175009A
Leg
U4
18408505
NASW-2305,
Operation
switch
pc
board
AT
27260171B
Shaft
A603
834430068
3TTS+6B(BC),
Tapping
screw
ass’y
A8
27220032A
Slider
A604
834430128
3TTS+12B(BC),
Tapping
screw
US
18448506A
NAAF-2306A,
Dynamic
bass
circuit
A9
27190359A
Holder,
dial
A701
27267402A
Guide,
decoration
pe
board
ass’y
Al0
28198632
Facet
A803
28321928
Knob,
power
<S)
U6
18414507A
NAEQ-2307A,
Equalizer
amplifier
pc
Al2
27115180
Side
bracket
R
28321905B
Knob,
power
(B)
board
ass’y
Al4
27130388
Bracket,
power
transformer
A804
28321886
Knob,
speaker
(S)
U7
18414508A
NASW-2308A,
Source
selector
switch
pc
Al6
27130390
Bracket,
center
28321894
Knob,
speaker
(B)
board
ass’y
Al7
27190011
Holder
A805
28322005A
Knob,
expander
U8
18454509D
NAAF-2309D,
Power
amplifier
and
power
Al9
27160174
Radiator
A806
28322006
Knob,
slide
power
supply
pc
board
ass’y
A21
27260172
Shaft
A807
28322007A
Knob,
loudness
(S)
.
U9
18408510
NATC-2310,
Tone
control
circuit
pc
A22
28320135
Connector
28322020A
Knob,
loudness
(B)
board
ass’y
A24
27120684
Back
panel
A808
28321887A
Knob,
volume
<S)
U10
18448511A
NASW-23114A,
Switch
pc
board
ass’y
A25
27130389B
Bracket
B
28321895
Knob,
volume
(B)
Uil
18408512
NASW-2312,
Speaker
switch
pc
board
A26
A
27300750
—
Strainrelief
A809
28322008
Knob,
balance
(S)
ass‘y
A28
27273030C
Joint
L
28322021A
Knob,
balance
(B)
U12
18408513.
NAHP-2313,
Headphone
terminal
pc
A30
27150202
Shielded
plate
A810
28322009A
Knob,
shift
<S)
board
ass’y
A38
834430068
3TTS+6B(BC),
Tapping
screw
28322022A
Knob,
shift
(B)
U13
18408514
NAVR-2314,
Volume
control
pc
board
A40
:
831130088
3TTW+8B,
Tapping
screw
F501
252076
3.15A-SE-EAK,
Speaker
protecion
ass’y
A41
838440089
4TTB+8C(BC),
Tapping
screw
F601
fuse
u14
18414516
NAPL-2316,
Edge
light
pc
board
ass’y
A42
834430168
3TTS+16B(BC),
Tapping
screw
F902
A,
252074
2A-SE-EAK,
Primary
fuse
A44
834430108
3TTS+10B(BC),
Tapping
screw
F903
A\
252078
5A-SE-EAK,
Secondary
fuse
A46
82142003
2P+3F(BC),
Pan
head
screw
F904
A47
82143006
3P+6FN(BC),
Pan
head
screw
F905
A
252070
1A-SE-EAK,
Secondary
fuse
ASO
880004
Rivert
P904
25060044
Terminal
GND
A301
28184271
Top
cover
(S)
P906
253128
AS
AS-CEE,
Power
supply
cord
28184272
Top
cover
<B>
Q501
222041
STK4843,
Power
amplifier
IC
A302
834430068
3TTS+6B(BC),
Tapping
screw
Q901
222780122
78M12,
Constant
voltage
IC
A501
18452121
Front
panel
ass’y
(S)
T901
232085
NMA-3034,
AM
loop
antenna
A5Ola
27267387
Guide,
speaker
T901la
27190105
Holder,
antenna
A501b
27267386B
Guide,
power
T902
Z\
230870A
NPT-875G,
Power
transformer
A501c
27267398
Guide,
loudness
ASOid
28191293B
Clear
plate
ASOle
28321992A°
Selector
knob
ass’y
ASOILf
28321998A
Knob
ass’y
A501
18472121
Front
panel
ass’y
(B)
ASOla
27267390
Guide,
speaker
A5S01b
27267389B
Guide,
power
AS01c
27267399
Guide,
loudness
A50ld
28191295C
Clear
plate
NOTE:
THE
COMPONENTS
IDENTIFIED
BY
MARK
NOTE:
|
#.
ARE
CRITICAL
FOR
RISK
OF
FIRE
AND
{S):
Only
silver
model
ELECTRIC
SHOCK.
REPLACE
ONLY
WITH
<B):
Only
black
model
PARTS
NUMBER
SPECIFIED.
TX-7230
CIRCUIT
DESCRIPTIONS
1.
Synthesizer
and
controller
operation
Pin
No.
{|
Symbol
Terminal
Description
1
GND
Ground
2
XT
X’tal
Connected
to
the
7.2MHz
crystal
oscillator
for
the
reference
frequency.
FM
band
specification
input
MW
band
specification
input
LW
band
specification
input
Mutual
reset
type,
performs
switching
of
each
band,
FM/MW/LW.
Manual
tuning
mode
specification
input
MANUAL
—-|-__—
8
AUTO
specification
input
Auto
search
tuning
mode
Mutual
reset
type,
performs
auto
search
and
manual
operation
mode
switching
during
UP/DOWN
tuning.
p10
DOWN DOWN
tuning
key
input
Memory
store
command
input
Preset
memory
channel
a
a
a
specification
input
Connect
the
push
key
and
perform
UP/DOWN
tuning.
The
preset
memory
is
set
to
the
write
mode
when
the
key
is
pressed.
Controls
the
write
and
read
out
of
the
internal
16-station
preset
memory
along
with
the
MC]
and
MC2
input.
MC-1
Set the
16-station
preset
memory
to
the
8
FM/8
AM
station
mode
or
Memory
control
input
the
FM/MW/LW
3-band
16-station
random
mode.
The
8
FM/8
AM
MC-2
mode
is
used
in
this
unit.
Osc?
AM
oeallaton
eaaninal
CR
connection
terminal
for
the
oscillator
that
determines
the
scan
speed
during
the
AM
search
mode.
—t
al
2
:
:
CR
connection
terminal
for
the
oscillator
that
determines
the
scan
os!
le
oscillator
terminal
speed
during
the
FM
search
mode.
Output
that
represents
the
SOkHz
FM
band
tuning
step
for
European
o/s
EM
SORHE
output
models.
Goes
to
the
high
level
for
the
50
kHz
setting.
7
CK2
CK
Tuned
frequency
Outputs
the
serial
data
and
timing
clock
to
the
tuned
frequency
display
data
output
driver.
28
MUTE
Muting
signal
output
Goes
to
the
high
level
during
muting
output.
Regin
specification
input
29 E2
30
El
See
table
1.
AM
IF
signal
input
ae
|
31
STOP
3
During
AM
reception,
this
counts
the
IF
signal
and
stops
auto
search.
ae
;
3
STOP
2
Auto
search
stop
When
the
stop
|
input
(pin
33)
is
at
the
high
level
and
this
terminal
2
signal
input
goes
to
the
high
level,
auto
search
is
stopped.
|
=,
: .
. .
*
d
.
33
STOP
1
Scan
speed
slow
input
When
the
high
level
is
input
at
this
terminal,
the
auto
search
speed
is
cut
in
half.
Pin
No.
|
Symbol
Terminal
Description
bs
{
fe
Charge
pump
output
of
the
phase
detector
which
constitutes
the
PLL.
34
DOI
High
level
is
output
when
the
divided
oscillation
frequency
is
high
than
:
the
reference
frequency.
In
the
opposite
case,
low
level
is
output.
{—
—}
Error
output
Floating
occurs
when
the
frequencies
match.
The
output
is
applied
to
the
variable
capacitor
diode
in
the
front
end
through
low
pass
filter
35
DO2
Q704
and
Q705.
The
output
from
both
terminals
is
the
same,
but
only
DOI
is
used.
{
36
TEST
Test
terminal
Test
mode
at
the
high
level.
+}
}..__-_-—
-
7
FM
programmable
“
37
FM
IN
counter
input
Connect
to
the
prescaler
output
(Pin3
of
Q701)
|
38
PSC
ra
a
control
Output
to
the
control
the
division
ratio
of
the
prescaler.
ie
AM
local
oscillator
:
‘ :
39
AM
IN
signal
input
Terminal
for
input
of
AM
broadcast
signal.
40
INH
Inhibit
input
Operates
normally
at
the
high
level.
Inhibit
status
at
the
low
level.
_.
4
1
..
int
idsialigetasat
Operates
normally
at
the
high
level.
At
the
low
level,
the
internal
status
a
a
is
initialized.
ea?
Mog
eee
le
|
‘Pewee
power
terminal;
:
supplies
5V
during
the
normal
operation
and
42
Yee
Power
stply
2.5V
from
the
super
capacitor
(C712)
for
memory
preservation.
be
table
|.
E]
E2
ei
Bane
i
Frequency
Intermediate
Reference
(Pin
30)
(Pin
29)
pa
a
range
frequency
step
frequency
-+—--_—_—___--—_}.
fp
—
FM
87.5
~
108.0
MHz
+10.7
MHz
100
kHz
25
kHz
0
l
foes
ht
ong
SO
U.S.A
AMI
520
~
1
710
kHz
+450
kHz
10kHz
10
kHz
ak
eles
|
eeeseen
|
l
AM2
522
~
1710
kHz
+450
kHz
9kHz
9kHz
|
FM
+10.7MHz
|
SO
kHz
25
kHz
fe
a
ee
]
0
Europe
|
MW
522
~
1611
kHz
+450
kHz
9
kHz
9
kHz
LM
153
~
360
kHz
+450
kHz
1
kHz
_t
FM
76.0
~
90.0
MHz
-
10.7
MHz
100
kHz
0 0
Japan
i.
AM
522
~
1611
kHz
+450
kHz
9
kHz
2.
Auto
Hi-blend
switch
circuit
The
Q103
FM
IF
system
incorporates
IC’s
with
a
built-in
IF
level
detector
with
a
13
pin
output.
If
an
input
above
38dB
enters
the
antenna,
Q205
is
turned
on,
and
Q721
is
turned
on,
the
Q722
and
Q202
are
turned
off
and
the
high
blend
function
is
turned
off.
—9—
TX-7230
3.
Auto
search
tuning
circuit
Q103
FM
IF
SYSTEM
TO
STEREO
DECODER
D811
Ww
WwW
0702
CONTROLLER
Q806
NOISE
DETECTOR
From
AM
IC
To
:
Signal
indicator
circuit
Maximum
frequency
Station
B
Station
A
Start
Minimum
frequenc
=
a
(fig.
4)
4.
FM/AM
switch
circuit
+B
Q702
Q155
Q709
(ON
The
FM/AM
selector
circuit
is
shown
in
the
diagram.
fig.5.
Pins
4
and
5
of
Q702
are
of
the
mutual
reset
type.
For
FM,
pin
4
is
high
and
pin
5
is
low;
for
AM,
pin
4
is
low and
pin
5
is
high.
Because
pin
5
is
high
and
pin
4
is
low
during
AM
reception,
Q709
is
off,
the
AM,
kHz
segments
of
the
fluores-
cent
display
are
turned
on.
Also,
since
Q708
goes
to
on
and
Q714
is
turned
off,
and
the
FM
indicators
are
turned
off.
At
the
same
time,
Q155
is
turned
off
and
Q154
turned
on,
so
+B
is
supplied
to
the
power
source
terminal
of
the
radio
Q154
To
AM/kHz
segment
To
FM/MHz
segment
During
FM
reception,
this
is
operated
by
the
IF
level
detec-
tion
and
zero
point
detection
circuits
included
in
the
FM
IF
system
IC
of
Q103
and
by
the
noise
component
detection
circuit
of
Q806.
When
a
station
is
tuned,
the
output
of
all
outputs
go
to
the
low
level
so
Q843
goes
from
on
to
off,
causing
pins
32
and
33
of
the
controller
IC
to
go
to
the
high
level
to
complete
auto
search
tuning.
During
AM
reception,
this
is
operated
by
the
IF
level
detec-
tion
included
in
the
AM
radio
system
IC
of
Q151.
When
a
station
is
turned,
Q152
goes
from
off
to
on
and
Q706
goes
to
off,
causing
pins
32
and
33
of
the
controller
IC
to
go
to
the
high
level
to
complete
auto
search
tuning.
@
Manual
Tuning
When
the
UP
or
DOWN
key
is
pressed,
the
frequency
goes
up
or
down
by
one
step.
When
either
key
is
held
down,
the
frequency
rapidly
increases
or
decreases
(scans)
and
stops
when
the
key
is
released.
When
either
end
of
the
turning
range
is
reached,
key
input
will
no
longer
be
received
and
the
frequency
will
stop
at
the
highest
or
lowest
frequency.
e@
Auto
Tuning
When
the
UP
or
DOWN
key
is
pressed,
scanning
begins
in
the
up
or
down
direction,
stopping
where
there
is
a
radio
station.
Since
auto
scan
is
operated
by
a
trian-
gular
wave,
scanning
is
begun
in
the
opposite
direction
the
instant
either
end
of
the
tuning
range
is
roached.
Also,
if
the
UP
or
DOWN
key
is
pressed
when
the
tuned
frequency
is
not
at
either
end
of
the
range,
up
or
down
scanning
will
begin.
Pin
16
of
Q201
VCO
stop
terminal
of
stereo
decoder
Pin
2
of
Q103
FM
IF
Amp,
stop
inpu
Muting
circuit
———
-
D119
Q108
Pins
8
&
14
AM
B+
Terminals
(
):
FM
reception
from
A.
G.
C
detector
circuit
(fig.
5}
system
pins
8
&
14
of
QIS].
Pin
16
of
Q201
goes
to
the
high
level,
the
VCO
oscillator
stops,
and
pin
2
of
Q103
gose
to
the
high
level
so
the
FM
IF
amp
is
also
switched
off.
Also,
during
AM
reception,
Q108
is
turned
on
so
the
muting
circuit
is
off.
During
FM
reception,
all
of
the
switching
transistors
mentioned
above
perform
the
opposite
operations
to
switch
to
the
FM
mode.
Figures
in
parenthese
indicate
transistor
Operation
during
FM
reception.
—10—