Onkyo TX-7230 User manual

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) Jt —
(ur 27
G28)

TX-7230
BLOCK DIAGRAM
—AMPLIFIER SECTION—
TUNER
o
BASS
TREBLE
VOLUME
Sel}
pal
S2
BALANCE RS)
LOUDNESS
Q301
EQUALIZER
AMP
~ 2301 $303
SELECTOR
PHONOO)
SOURCE
INDICATOR »
To.Rch
co.
POWER SPEAKER:
mReC
QO——+~—____}_
pre
t_-
AMP
PROTECTION
TAPE-1
aaa
PB
HE ADPHONE
p-REC
TAPE-2
tpa O—
Q9210922
SPEAKER A
QS23
DY NAMIC
BASS
€ XPANDER
owt LEVEL °
*
SPEAKER B
—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—
NARF - 23020!
L302
8 CT + SR | : LET
H | JFeceu23 | gt.
a ASENNA i j .
x101 @101-x102, Q102,—Ssx103 hee L201 : 1p.
TERMINAL RF FM iF FM tf FM IF FM IF EM IF 2 DIROIE a 4
MIXER IFT FILTER AMP FILTER AMP FILTER FILTER
Q20)
STEREO CECQDER
FM IF SYSTEM
(AMP.,MUTING, METER & DET. }
150|
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yw
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ira
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z
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re)
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zr
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AMP
ANTENNA TUNED TUNED
CIRCUIT 2 CIRCUIT CIRCUIT
£103,107
NOISE
DETECTOR
BUFFER
zg (76KHz) I
R203
SEPARATION
L203
202 F
GATE
cirRcult &
IF AMP. OFF
AM LOOP
ANTENNA
Q1s1
AM RADIO SYSTEM
aiss 106
GATE
CIRCUIT
Q205
GATE
ciRcult
X1S)
AM IF
FILTER
GATE
CIRCUIT
TUNED
CIRCUIT
B g=8
Os:
2
on
zz
3
Q208
MUTING
C) C ) Swi TCH
Q706
AUTO-STOP
SWITCH
Q701 @ l-Our
PRESCALER
Q704,0708
LOW PASS
FILTER
ey R-OUT
Q703
STATIC FREQUENCY
ORIVER
Q702
PLL SYNTHESIZER & CONTROLLER
id, daeadecedes i :
42
STEREO @)
AUTO
SwiTCH
SWITCH
ons
merce — @avze FaSPeseR”
zj)=z INOICATOI
a a = 2 Stale SWITCH pert
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2 PS Fe 2 SWITCH — —
Fees 2 FA < EM +8 FM MH
fia = 2 = SWITCH z
AM PETA LAT se
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soe 7 ae tures
NADG-23030
CRCUIT
L
fio
: : {nicaroal
SWITCH
Q709
GATE
CIRCUIT
GATE
CIRCUIT
+ Q710
5OKHz
.
Inpicaror”
)
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—

5. PLL tuned circuit
FM local fo
Prescaler
oscillator
| circult 1/30 or 1/32
AM tocal 39:
oscillator
circurt
“al PSC
Swallow
counter
fo selector divider
_7.2MHz
crystal
oscillator
FM/AM Programmable| ft [Phase
fr Reference
frequency
comparator divider
reas oe cal
|
+
Low pass Eo
filter controler LSI
(fig. 6)
PSC
OUT 1
2) OUT 2
(fig 7) TO6104P (Prescaler)
A block diagram of the tuned circuit of the PLL is shown in
figer 6.
Operation during AM reception
The reception frequency is applied to the programmable
divider where it is divided to 1/N and output as fv. This is
applied to the phase comparator where it is comparated
with frequency reference fr (9kHz for G/W model and
10kHz for D model). If fr and fv differ, Eo equal to the dif-
ference in frequency is output. Since error output Eo is a
pulse waveform, it is passed through the low pass filter to
change it into DC voltage Vo, which is applied to the varia-
ble capacitor diode in the front end to change the reception
frequency. This continues until fv and fr are the same and
Eo=0.
Operation during FM reception
The pulse swallow method is used in the prescaler of
this unit. In this type of prescaler, a supplementary number
6. Frequency indicator circuit
al bicl di el fl gi a2b2¢2 d2e2 f2 g2 a3 b3 c3 d3 e3 13 g3
SEVEN SEGMENT DRIVER ISEVEN SEGMENT ORIVER
SEVEN SEGMENT ORIVER
Binary to BCD and IF OFFSET ROM
(fig. 8) TDG301AP block diagram
(changed according to the program code input) and the
divided reception frequency from the prescaler are com-
bined in the control counter and the prescaler’s division
factor is switched 1/30 or 1/32 according to external
control (1/32 when the PSC terminal is “H” and 1/30 when
it is “L”).
The station oscillator frequency is applied ot the program-
mable divider, but the programmable divider has en upper
frequency limit of only 30MHz, so the pulse swallow-type
prescaler, which can be used up to 150 MHz, is inserted for
division to 1/Np;
The signal is applied to the programmable divider and
divided to 1/N. The result is compared with a 25kHz
frequency reference in the phase detector and the error
is output as Eo until a match is obtained as in AM opera-
tion.

TX-7230
Pin
No.
Terminal
Description
ie
se
posta
lie
tiane
ae
tes
:
|
;
L/D
Ouiput
indication
switching
input
terminal:
Fluorescent
display
at
the
low
level,
and
/
LED
display
at
the
high
level.
|
:
+
zs
|
2
Data
Tuned
frequency
data
input
terminal:
Input
from
the
system
controller
LSI
to
the
serial.
34
CKL.CK2
Tuned
frequency
data
input
control
timing
input
terminal:
|
;
ops
st,
Transferred
simultaneously
with
data
from
the
system
controller
LSI.
Es
Ss
eee
5
1/0
Segment
drive
output
terminal:
Sets
the
number
of
display
digit
for
FM
(100MHz)
and
/
AM
(1
,000kHz)
reception.
L
at
ae
6-12
3.93
Seven
segment
drive
output
terminals:
Sets
the
number
of
display
digit
for
FM(1OMHz)
;
a8
and
AM
(100kHz)
reception.
zl
13.
15-20
2-92
Seven
segment
drive
output
terminals:
Sets
the
number
of
display
digit
for
FM
(1MHz)
as
ave
and
AM
(10kHz)
reception
.
.
.
soe
.
34.97
fi
Seven
segment
drive
output
terminals;
set
the
number
of
display
digit
for
FM
(100kHz)
ew
8
and
AM
(1kHz)
reception
[
oe
14
Vec
Power
source
terminal
“|
t
28
Gnd
Ground
|
7.
Muting
circuit
The
muting
circuit
operates
in
the
following
cases.
1.
Q103
FM IF
SYstem
from muting output of controller IC
To output
Q207
Muting
Switch
a109, Q110
Schmidt
Trigger
To output
Switch
0201
Stereo decoder
(SOkHz
step)—
are
output
at
pin
12
through
the
AND
While
pin
28
of
the
controller
IC
outputs
the
high
level,
Q207
and
Q208
are
turned
on
and
muting
is
closed
in
the
following
cases:
(1)
While
the
the
manual
UP/DOWN
switch
is
being
held
down,
(2)
When
a
station
in
the
memory’
is
recalled,
and
(3)
While
a
radio
station
is
being
received
using
auto
search
tuning.
.
When
an
FM
station
is
not
being
received
(and
the
mut-
ing
switch
is
on).
The
IF
level
in
the
FM
IF
system
(set
at
R120
so
muting
is
opened
at
17
dBf
(low
position))
and
zero
point
detec-.
tion
circuit
(tuning
point
55kHz
(100kHz
step):
30kHz
circuit.
When
a
station
is
tuned,
the
output
goes
to
the
low
level.
When
output
goes
to
the
low
level,
Q109
is
turned
off,
Q110
is
turned
on
and
Q207
and
Q208
are
turned
off,
so
muting
is
opened.
At
the
same,
pin
16
of
stereo
decoder
Q201
goes
to
the
low
level,
so
the
VCO
oscil-
lator
starts.
—12—

ADJUSTMENT PROCEDURES
FM section
Connection
Stereo
modu-
Turning
dial
‘oer
:
.
fe
[|
—
|
—
FM
RF
2
107.9
MHz
1
kHz,
75
kHz
devi.
Fig. 2
Maxi
necessary
to
AC
voltmeter
RF
piers
adjust.
output
FM
IF
2
Fig.
2
P : mi :
vo
|
fe
Primary coil
R215 19 kHz + 10 Hz
PTE Ste
Distortion analyzer IF
2
107.9 MHz
99.0 MHz DC voltmeter Muting switch : off
Repeat the steps 1
and 2 until no
99.0 MHz
1
kHz,
75
kHz
devi.
65
dBf
(60
dB)
L102
.
99.0
MHz
Distortion
analyzer
|
Secondary
further
adjust-
coil
ment
is
necessary
99.0 MHz
1 kHz, 75 kHz devi.
65 dBf (60 dB)
Frequency counter Muting switch: no
99.0 MHz
65 dBf (60 dB)
Ext. modulation
Distortion
99.0
MHz
99.0 MHz
65 dBf (60 dB)
Ext. modulation
Lch.
1
kHz
R
ch.
AC
voltmeter
Signal output
Maximum and
same separation
Separation
R ch. 1 kHz L ch. AC voltmeter
99.0 MHz
17.2 dBf (12 dB)
1 kHz, 75 kHz devi.
99.0 MHz
Oscilloscope R120
Muting switch:
on
99.0 MHz
16.2 dBf (11 dB)
1 kHz, 75 kHz devi.
No output
OUTPUT
Terminal
terminal
OUTPUT
XT.
mode
antenna
OUTPUT
terminal
E
termina! terminal
FM
signal
AC
FM
signal
Distortion
Stereo
:
AC
generator
voltmeter
generator
analyzer
modulator
voltmeter
:
antenna
antenna
terminal
terminal
terminat
T
Terminal
erminals
a
vt
Ti
Tp2)
|
TR2
TP.4
Digital
OC
DC
Frequency
Distortion
voltmeter
Oscilloscope
counter
voltmeter
analyzer
(tig.
1)
(fig.
2)
(fig.
3)
AM section
eee : AM SG : | re Tuned | Output Adjustment +... for | Remarks |
—
*
N
No
.e)
oO

AM section
4
*
NS
N
w
oO
Tuned Output | Adjustment ances R k
frequency
|
indicator
point
JUSU
TOE
ae
eee jon
Spee
LA
ees
L153
1.2V
Repeat
the
steps
1
4
and
2
until
no
fur-
a
her
adjustment
is
28
1611kHz
|
Digital
DC
9.0V
t
j
‘
2
voltmeter
C170
MER
eseaty:
oe
5
ley
—————
TT
AM
Se
em
t=
3 | (600kHz) voltmeter Eps! Mean Repeat the steps 3 AM {oop Terminal
400Hz
30%
mod.
L
and
4
until
no
fur-
LOOP
pit
VT
ther
adjustment
is
Digital
1404kHz
1404kHz
AC
necessar
oe
aauiak
(1400kHz)
—\voltmeter
|
C152
|
Maximum
ms
400Hz
30%
mod.
it
ecaias 1
vean ie 999kHz | AC
(1000kHz)
voltmeter
X151
Maximum
400Hz 30% mod.
@ C170
L183
Osc

PRINTED CIRCUIT BOARD VIEW FROM BOTTOM SIDE
TUNER CIRCUIT PC BOARD
8
$e
ee
i
Gachn
(4130, San
» RAZ3 ES & ; OV
UC aid,
9153 R186
fs
“"3g1> INV Std”
PRINTED CIRCUIT BOARD-PARTS LIST
TUNER CIRCUIT PC BOARD(NARF-2302D) CIRCUIT NO. PART NO. DESCRIPTION CIRCUIT NO.
Transistors
CIRCUIT NO. PART NO. DESCRIPTION Q206 2211454 or 2SA1015(Y) or L153
Front end 2212494 JA101(P) L201
TUOOIL 240059 FE416U33 ~ Q207,Q208 2211705 or 2SD655(E) or L202,L203
ICs 2211706 2SD655(F)
Q103
222540
HA-11225
.
Diodes
L102
Q151 222701 LA-1245 D101 2243192 or MTZ8, 2B or
Q201 222678 uPC-1161C3 2239552 RD8, 2EB2 X101-K103
Transistors D102,D106 223150, US1040, X151
Q101 2211723 or 2SC1923(O) or D109-D119 223145 or 182076TD or XK152
2211722 2SC1923(R) 223124 182473
Q102 2211723 or 28C1923(O) or D108 2243132 or MTZ4.7B or C101
2211722 28C1923(R) 2239432 RD4.7EB2 C107,C110
Q104,Q105 2211255, 2SC1815(GR), — D104,D105 223132 1K60 Clli
Q107-Q110 2210746 or 2SC945A(P) or D151,D152 223140 KV1236 C117
Q152 2212485 JC501(Q) Coils C118
Q154,Q155 2211255, 28C1815(GR), L001 233312 NFA-305 1 C120
2210746 or 2SC945A(P) or L101 233105 or NCCH-1005 or C123
2212485 JC501(Q) 233024 NCCH-1501 C125
Q153,Q106 2211256 2SC1815(BL) L103 233031 NMC-9-1 C126
Q205 L151 232113 NMA-3049 C128
Q202 2211945 or 2SK246(GR) or
2212304 2SK381(D)
-15=

TX-—7230
CIRCUIT NO. PART NO. DESCRIPTION
Capacitors
C152 3060010 NTC-20P09, Trimmer
C158 352741009 10uF, 16V, Elect.
C161 352744709 47 uF, 16V, Elect.
C162 352780109 1pF,50V, Elect.
C165,C166 352750479 4.7uF, 25V, Elect.
C168
370135114
510pF+5%,
100V,
APS
c170 3060010 NTC-20P09, Trimmer
C174 352782299 0.22uF, 50V, Elect.
C175 352721019 100uF, 6.3V, Elect.
C176 352780339 3.3uF, SOV, Elect.
C201 352744719 470uF, 16V, Elect.
C203 352750479 4.7uF, 25V, Elect.
C209,C210
352741009
10uF,
16V,
Elect.
C212
352782299
0.22uF,
50V,
Elect.
C213
352780109
luF,
50V,
Elect.
C214
352780339
3.3uF,
50V,
Elect.
C215
370134714
470pF+5%,
100V,
APS
C220,C221
352780229
2.2uF,
50V,
Elect.
Resistors
R120
5215045
NO8HRIOKBC,
Semi-fixed
R203
§215048
NO8HR200KBC,
Semi-fixed
R215
5215044
NO8HRSKBC,
Semi-fixed
Terminal
POO1
25060087
NTM-2PDMN31,
Antenna
Sockets
25050141
NJPS—4P-S
25050140 NJPS-3P-S
CIRCUIT NO. PART NO. DESCRIPTION
Coils
L153 232110 NMO-4027
L201 233236 NMC-6027
L202,L203 233291 NMC-5039
Transformer
L102 233274 NFIF-6041
Ceramic filters
~
X101-X103
3010043
SFE10.7MM
X151
3010075
SFL450B3
X152 3010076 BFU450C
Capacitors
C101
352780339
3.3uF,
50V,
Elect.
C107,C110
352780109
1uF,
50V,
Elect.
C111
352741009
10yF,
16V,
Elect.
C117
352784799
0.47uF,
50V,
Elect.
C118
352742209
22uF,
16V,
Elect.
C120
352741009
10uF,
16V,
Elect.
C123
352784799
0.47pF,
SOV,
Elect.
C)25
352780229
2.2uF,
50V,
Elect.
C126
352780109
1uF,
SOV,
Elect.
C128
352741009
10uF,
16V,
Elect.
anf Gin:

SCHEMATIC DIAGRAM
TX-7230
~TUNER SECTION—
101
Q102
cine C106
cw?
cide
TP-2
104,105,
107-110
)
2SC1815GR
or
|
FE6I6UI3
2SC1923-OorR
—-2SC1923-O0rR
0.072
0027
W50_330P
6.072
0
oO
152,154.
155
}
25C965AP
or
|
71 0706~711,717,718 } JCS010
Pet
|
0153,0106,a205
2SCI815SBL
i x101 ae Q71 3.0705 2SC1815GR
i SFEIO7 207,208,714 2S0655E or F
FM
Q202
2SK246GR
or
25K3810
|
! Q206.712 2SA1015Y, JAIOIF
| 101 = Q721~724 — OTAI24ES or 25A1346
| RD8.2EB2
MTZ8.28 : 0102.106,107,109~119 } US1040 or
gli
cus
aye
coz
|
xX102———c103
x103,
|
|
|
G24
Sex
fosAez
2
jserset
of
F
|r
i
BIA
101705
0810)
eer
ee
SFEI07
0-022
ge
e49.7
(102
NF
IF
6041
0751.762,763
j
H
774.776.9777 SEL 2913K COR)
| f 0786,787, 789
AM
ae
0752.754~761
i byt eas cms cuz ci a ee oo T5b~
O1~ 04 Ss 783~
1SVSS or SvC211. Seb = foros son | ema §—9783~785
av
2
0753,
779
SEL2213C
R1Gt o
took 0151,0152 KV1236
40/2 BFULSOC
Q70
ner BSKI0800r
2S K68M
86
a723 fc7n
pie fas
Pati
l
35
Evy i 32
TC9147BP
10
Hn
702
+ 12.13
R
Gk AIS SFLAs0B3
= 29
0104.0105
1K60
BATT Te ke
6 R203 C210
OK 10/16
Q201 9 mPC1161C3
F779 680
Zh 30-5
psc-5
Wo 1200«13
Q703 TO6301AP
26025 23 22:21 20 «(219 «238 17_—16 5
ale erate atatatatata ta aig
%
favs
< R782
ae}
ae,
vere 0785 :
Va
_ LZ] p76 (-¢) &
MAN
AUT
UP
COWN
MEM
My,
My,
“
mi
L
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0787
x
aoe
R783
ee
ie
ae
aa
29°30
31
26
32
26
LI
33 30
23-22
21
Wig
1s
13
2&1
3
Res
t4)=2-5
Ls __iNASW-2: os; i . —T Miz FM AM KHz at BI gi P “6 e4 a2 b2 C2 G2 e2 : 92 a2 b3c3d3 e3 {3 de ce be ac ga niaicazed
680% 5
NOTES
Q715
FIP7BaCS
:
®ALL RESISTORS ARE IN OHMS, 1/GWATT OR 1/GWATT UNLESS OTHERWISE NOTED. }uc-s
@ALL CAPACITORS ARE IN uF, SOWV UNLESS OTHERWISE NOTED. MHz he ?
* ELECTROLYTIC CAPACITORS (£85) ARE IN uF/WV. B. 8 —_—- Spy ee ee Pa eee
© VOLTAGE (MEASURED WITH VTVM (NO INPUT SIGNAL). a M cI Sxuz Pd Ae ga see
eCIRCUIT
IS
SUBJECT
TO
CHANGE
FOR
IMPROVEMENT
Y
reste7Be
HA11225
TO6I04P
28€1923
2SD655
28K381
aE
RI,R2=
22K,
(TOG 3OTAF) mPCII6IC3 25€1815 2SA1015 25K246 2
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FIP7B8CS
T
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8010)
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(0)
ONKYO CORPORATION

TX-7230 TX-7230
PRINTED CIRCUIT BOARD VIEW FROM BOTTOM SIDE
2>OWER AMPLIFIER AND POWER SUPPLY CIRCUIT PC BOARD
“osot [It at TOTTTT (Boson See aS
2 OQ SRS Sears ae SR: Se ee AR OAR CARE
NCP OY 6802s = C506 = C50*'.S $905." * C605: C603. "C606 =; “C602 Nf te
a ES a) Se ms BI ab w= eg & 1
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:
:
eckaieweAC
ic
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=
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Sasi
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SPEAKER SWITCH PC BOARD
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ps oe =
a ASSO Lest AT kb TEs
828 a
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NCHP-
c302 wZ
2.) aS BS
ea i= Po
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SP-B ... S601
PL ” 2° a 25
Qe >o OYHMO ‘Zsrsenie
Ac" AC-2(C)
E
te PRINTED CIRCUIT BOARD-PARTS LIST
S 2 3
ae
2
Noe
AND
POWER
SUPPLY
PC
BOARD
CIRCUIT
NO.
PART
NO.
= : Diodes
; D921-D923 223150,
CIRCUITNO. PARTNO. DESCRIPTION 223145 or
ICs 223124
Q501,Q601 222041 STK-4843 Coils
Q901 222780122 78M12 L501,L601 231001
ree ‘ Transistors Capacitors
Q902,Q921 _ 2211225 2SC1815(GR) C501,C601 352780479
Q922
2211254
2SC1815(Y)
C€504,C604
352731019
Diodes C507,C607 352984799
D901-D906
223845
GP-20D
C510,C610
352984799
D907,D908 2243273, MTZ18C, C511,C611 352784709
2241191, GZA18X, C513,C514 352781019
2241192
or
GZA18Y
or
C515,C517
352781009
2239713
RD18EB3
c901
A\3500065A
D909
223862
WLO01
C905
,C906
3504177
D910
223880
GP101N4003
C907,C908
352761019
D911
2241291
RD3.3EB1
c909,C910
352752219
D912 2239733 or RD20EB3 or
2243283 MTZ20C
P50t
HEADPHONE TERMINAL PC BOARD
R661
231s vv
25132313 QYHUO
R56
DESCRIPTION
US1040,
182076TD or
182473
S-1.3B
4.7uF, 50V, Elect.
100uF, 10V, Elect.
0.47uF, 50V, Non-polar elect.
0.47uF, 50V, Non-polar elect.
47uF, 50V, Elect,
100uF, SOV, Elect.
1CaP, 50V, Elect.
0.01uF, AC400V/125V, IS
6,800uF, 42V, Elect.
100uF, 35V, Elect.
220uF, 25V, Elect.
CIRCUIT NO. PART NO.
Capacitor
C912 352761019
C913 352752229
C914 352751019
C916 352741009
C917 352780109
C921 352753309
C923 352780339
Resistors
R507,R607 441521024
R508,R608 441523324
R510,R610 441522424
R511,R611 441520474
R512,R612 441520474
R513 441525614
R514 441521014
R902 441523904
R904-R907 441524314
R908 441621024
R909 441720624
R910 441624714
R924 441522704
Terminal
P501 25060058
25060092
Switch
$901 AX.25035398
Relay
RL921 25065134
Fuses
F501,F601 A\ 252076
F902 A\252074
F903,F904 4\252078
F905 48252070
Fuseholders
A\25050065
Cover
C901a A\27300601
Sockets
25050140
25050143
Label .
29360472
DESCRIPTION
100uF, 35V, Elect.
2,200uF, 25V, Elect.
100uF, 25V, Elect.
10uF, 16V, Elect.
1pF, S50V, Elect.
33uF, 25V, Elect.
3.3uF, 50V, Elect.
1kQ, 1/2W, Metal oxide film
3.3kQ, 1/2W, Metal oxide film
2.4kQ, 1/2W,'Metal oxide film
4.72, 1/2W, Metal oxide film
4.72, 1/2W, Metal oxide film
5602, Metal oxide film
100Q, 1/2W, Metal oxide film
392, 1/2W, Metal oxide film
4302, 1/2W, Metal oxide film
1kQ, 1W, Metal oxide film
6.22, 2W, Metal oxide film
470Q, 1/2W, Metal oxide film
272, 1/2W, Metal oxide film
NTM-8PDML25, Speaker
NTM-1S33
NPS-111-L362P, Power
NRL-2PSA-DC24V-07
3.15A-SE-EAK, Speaker protection
2A-SE-EAK, Primary
5A-SE-EAK, Secondary
1A-SE-EAK, Secondary
YSH403T
SB-1925, Capacitor for C901
NJPS-3P-S
NJPS-6P-S
T3.15A/250V, Fuse, rating
SPEAKER SWITCH PC BOARD(NASW-2312)
CIRCUIT NO. PART NO.
$501,S601 25035467
DESCRIPTION
NPS-212-L429, Speaker switch
HEADPHONE TERMINAL PC BOARD(NAHP-2313)
CIRCUIT NO. PART NO.
P502 25045138
R561,R661 441523914
=27=
NOTE: THE COMPONENTS IDENTIFIED BY MARK
A, ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE ONLY WITH
PARTS NUMBER SPECIFIED.
DESCRIPTION
HLJ0520-01-010, Headphone
terminal
390Q, 1/2W, Metal oxide film
resistor

TX-7230
1
2 3
4
5
6
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ALL CAPACITORS ARE IN yf SOWV UNLESS OTHERWISE NOTED.
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© VOLTAGE (MEASURED WITH V.TV.M.CoIV 1S DC VOLTAGE(STOP MODE).
o THE COMPONENTS INDENTIFIED BY MARKANARE CRITICAL FOR
SAFETY REPLASE ONLY WITH PART NUMBER SPACIFIED-
Q301,0302, Q501,060! Q902,9921, 0525,0526,
0523,0524 0922
ONKYO CORPORATION

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TX-7230 TX-7230
PRINTED CIRCUIT BOARD VIEW FROM BOTTOM SIDE
DYNAMIC BASS CIRCUIT PC BOARD
aap eae ID 2 ARSE S CRS ee
PRINTED CIRCUIT BOARD-PARTS LIST
EQUALIZER AMPLIFIER PC BOARD(NAEOQ-2307A)
CIRCUIT NO.
Q301,Q302
C302,C402
C305 ,C405
C308,C408
C309,C310
P301
PART NO.
Ic
222534
Capacitors
352780229
352721019
352780229
352753319
Terminal
25045142
DESCRIPTION
NJM-455 9DX
2.2uF, 50V, Elect.
100uF, 6.3V, Elect.
2.2uF, SOV, Elect.
330uF, 25V, Elect,
NPJ-4PDBL55
BLOCK DIAGRAM
STK-4843(Power amptifier)
INPUT (1621 ©
W920
DYNAMIC BASS CIRCUIT PC.BOARD(NAAF-2306A)
CIRCUIT NO. PART NO DESCRIPTION
ICs
Q523,Q524 222502 NJM4558DX
Transistors
Q525 ,Q526 2211945 2SK246(GR)
Diodes
D521,D522 223124, 182473,
223145 or 1S2076TD or
223150 US1040
Capacitors
C$32 352732209 22uF, 10V, Elect.
C5 35-C539 352784799 0.47uF, 50V, Elect.
C540,C541 + 352744709 47uF, 16V, Elect.
Switch
$531 25035480 NPS-142-L442, Push
NJM4558/4559(Operation amplifier)
ORY tie
BSS) Gh Ps
—25—
NCAF.
25132306
SWITCH PC BOARD
r-S- IN j
cS OP
TE hy
NCSW-2311 fm
ti >
—251323t1 ot
SWITCH PC BOARD(NASW-2311A)
CIRCUIT NO. PART NO. DESCRIPTION
$352,S353 25035471 NPS-222-L433, Selector switch
VOLUME CONTROL PC BOARD
OO
P463
V2-Le
9
R-23
C
25132314 NCV
VOLUME CONTROL PC BOARD(NAVR-2314)
CIRCUITNO. PARTNO. DESCRIPTION
R363,R463 5148101 N16RGM100KBTP30, Variable
resistor
EDGE LIGHT PC BOARD
EDGE LIGHT PC BOARD(NAPL-2316)
CIRCUIT NO. PART NO. DESCRIPTION
PL901 210064A PL6.3V, 0.25A, Lamp
SOURCE SELECTOR SWITCH PC BOARD
$301 y302
TUNER
$302
PHONO
NCSW-2308
25142308
S305
TAPE-2
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SOURCE SELECTOR SWITCH PC BOARD(NASW-2308A)
CIRCUIT NO. PART NO.
D301,D302 223124
223145 or
223150
$301-S305 25035468
P302,P303 25045142
25050143
DESCRIPTION
182473,
1S2076TD or
US1040, Diode
NPS-542-L430, Push switch
NPJ-4PDBLS55, Tape input/output
NJPS-6P-S, Socket, jumper
TONE CONTROL PC BOARD
13344
rl
BS
a
~_
Dv
>
a
w
v
w
on
N
za
w
uv
a
NCTC-2310
25132310
TONE CONTROL CIRCUIT PC BOARD(NATC-2310)
CIRCUIT NO. PART NO.
R352,R452 5146049
R353,R453 5148073
R361,R461 5148102
—26—
DESCRIPTION
N16RLC250KWT30, Balance control
variable resistor
N16RQMC110K180K30, Bass control
variable resistor
N16RGMC219K30, Treble control
variable resistor