Panasonic RX-C300 User manual

ORDER NO. GAD85032238C1
Service Manual
Radio Cassette
RX-C300
(Black)
Portable Stereo Component System
@ SPECIFICATIONS
This is the Service Manual
for the following areas.
[MI...For U.S.A.
[Cl. .. For Canada.
General:
Power
Requirement:
(MJ...
AC;
110~115/115~127/200~220/
Max.
size
230~250
V,
50/60
Hz
System
[Cc]...
AC;
120
V,
60
Hz
2316”
(W)X15%46”
(H)X71%6”
(D)
Battery;
15
V
(Ten
“D”
Size
Flashlight
(585
x
382x202)
mm
Batteries)
(UM-1 or equivalent)
Car battery; with optional car adaptor
RP-9550
Tuner Amplifier
9” (W)x6%6” (H)x71%6” (D)
(228 x 157X201) mm
Cassette Deck
Power Consumption: 60 W (AC only) 9” (W)x6%6” (H)X71%” (D)
Power Output: 80 W ...MPO (228 157x190) mm
Speaker: Woofer; 67/2” (16 cm), PM Dynamic Speaker
Speaker (5Q) 7316” (W)xX 12%" (H)X7V2” (D)
Squawker; 21%” (6.5 cm) PM Dynamic , (182311190) mm
Speaker (5Q) Weight: ; 10.8 kg (23 Ib. 13 02.) without batteries
Tweeter; 1¥/2”x2” (2.8 cmx4.7 cm) Radio Section:
Ceramic Speaker (1.4kQ) Radio Frequency
Input: MIC; sensitivity 0.8 mV/applicable Range: FM; 88~108 MHz
microphone impedance 200~600Q, @3.5 AM; 525~1610 kHz
PHONO; sensitivity 5 mV/47 kQ over Intermediate Frequency: FM; 10.7 MHz
LINE IN/CD; sensitivity 200 mV/47 kQ over AM; 455 kHz
DCIN; 13.2V Sensitivity: FM; 2.5 uV/SO mW output
Output: LINE OUT; sensitivity 420 mV/4.7 kQ under (—3 dB Limit sens.)
EXT SP; 5~80 AM; 71 uV/m/50 mW output
HEADPHONES; 32Q, @3.5 Tape Deck Section:
EXT ANTENNA and EARTH Frequency Response: 40~ 15,000 Hz (with normal tape)
Dimensions: Not included handle, projecting parts 40~ 16,000 Hz (with CrOz tape)
Panasonic.
and controls
40~ 16,000 Hz (with Metal tape)
System Recording System: AC bias, AC erase
23/16” (W) X12” (H)X7%6” (D) Tape Speed: 4.8 cm/s. (1% ips) ;
(585x305 x 185) mm Track System: 4-track 2-channel stereo recording and
Tuner Amplifier
87/6” (W)x57%” (H)X7%6” (D)
(215x 150X185) mm
Cassette Deck
87/6” (W)X5%” (H)x 7%” (D)
playback
(215x 150x185) mm
Speaker
7%” (W)X12” (H)X7Vi6” (D) “Dolby” and the double-D symbol are
(181 x305x 180) mm 00 DOLBY SYSTEM trademarks of Dolby Laboratories
Weights and dimensions shown are approximate.
(Les poids et dimensions mentionnés sont approximatifs.)
Design and specifications are subject to change without notice.
Matsushita Engineering and
Service Company
50 Meadowland Parkway,
Secaucus, New Jersey 07094
P.O. Box 774
Matsushita Electric
of Canada Limited
Panasonic Hawaii Inc.
91-238 Kauhi St. Ewa Beach
Honolulu, Hawaii 96808-0774
Licensing Corporation.
Noise reduction system manufac-
tured under license from Dolby Labor-
atories Licensing Corporation.
Panasonic Sales Company,
Division of Matsushita Electric
of Puerto Rico, Inc.
Ave. 65 De Infz.nteria, KM 9.7
Victoria Industrial Park
Carolina, Puerto Rico 00630
5770 Ambler Drive, Mississauga,
Ontario, L4W 2T3

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CONTENTS
ITEM PAGE ITEM PAGE
Safty Precautions/Insulation Resistance Test ............... 2 SElectricaliPants:List’ c.oc5cBeiccoiiageaectacadiomatesaeds 20
e@Location of Controls and Components ................0-5- 2 Schematic Diagram (Cassette Deck) Model RX-C300........ 22
eDisassembly Instructions ............. 0.0 eee eee eee eee 4 @Circuit Board and Wiring Connection Diagram (Cassette Deck)
e@Measurements and Adjustments .................0000 eee 6 Model. RX=C300 | iiss jsisisse sai Seastvartsnseene, due vausravaceiaes wubnenaresina ded avinere 25
SCITCUIE DESCHIPLIONS: eceessce 5 cenecanseh sd seeiscoip ie sreverecsity sega eeeneeit 9 e@Mechanism Parts Location .............. eee eee eee ees 28
eSchematic Diagram (Tuner) Model RX-C300 .............. 11 @Cabinet Parts LOCAtOM s.sic3:5:é:scsce-s aisosrare sectaraers drarerarannaeeiara aes 29
eSchematic Diagram (Amplifier) Model RX-C300 ............ 14
eCircuit Board and Wiring Connection Diagram (Tuner Amplifier)
Model RX-C300 ......... cece cece eee eee eee eeee 17
easy
a
SAFETY PRECAUTIONS (For u.s.a,)
Before servicing, unplug the power cord to prevent an electric shock.
When replacing parts, use only manufacturer’s recommended components for safety.
Check the condition of the power cord. Replace if wear or damage is evident.
After servicing, be sure to restore the lead dress, insulation barriers, insulation papers,
sheilds, etc.
Before returning the serviced equipment to the customer, be sure to make the following
insulation resistance test to prevent the customer from being exposed to a shock hazard.
INSULATION RESISTANCE TEST (For u.s.a.)
1.
2.
3.
Unplug the power cord and short the two prongs of the plug with a jumper wire.
Turn on the power switch.
Measure the resistance value with ohmmeter between the jumpered AC plug and each
exposed metal cabinet part, such as screwheads, antenna, control shafts, handle
brackets, etc. Equipment with antenna terminals should read between 3MQ and 5.2MQ to
all exposed parts’. (Fig. 1) Equipment without antenna terminals should read
approximately infinity to all exposed parts. (Fig. 2)
* Note: Some exposed parts may be isolated from the chassis by design. These will read
infinity.
. If the measurement is outside the specified limits, there is a possibility of a shock hazard.
The equipment should be repaired and rechecked before it is returned to the customer.
Antenna
terminal
Exposed
metal
part
Ohmmeter
Fig. 1
Resistance = 3M2—5.2MQ
Exposed
metal
part
Ohmmeter
Fig. 2
Resistance = Approx
LOCATION OF CONTROLS AND COMPONENTS

TUNER AMPLIFIER
@ Function Selector (FUNCTION)
@ FM Mode Selector/Beat Proof Switch (FM MODE/B.P)
© Band Selector (BAND)
@ FM Stereo Indicator (FM ST)
© Tuning Indicator (TUNING)
© Tuning Control (TUNING)
@ Volume Control (VOLUME)
© Balance Control! (BALANCE)
© Graphic Equalizer Controls (GRAPHIC EQUALIZER)
@ Headphones Jack (PHONES) 23.5, 320
When using the headphones, avoid listening to sound for a long
period of time and avoid excessive volume levels, which may
injure your ears.
@ Spectrum Analyzer Switch (SPECTRUM ANALYZER)
@ Spectrum Analyzer (SPECTRUM ANALYZER)
Blank Skip Function
Pressing the Blank Skip Switch during tape playback will set the
unit to the TPS mode when a blank interval of more than 15
seconds is detected on the tape, and playback will begin from the
start of the next selection.
eUseful for skipping over the unrecorded portion at the end of the
tape during Auto-Reverse Playback.
—————> Tape Running
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CASSETTE DECK
® Cassette Compartment
@® Tape Counter and Reset Button (COUNTER)
® Eject Button (4 EJECT)
@® Reverse Mode Selector (REVERSE MODE)
@ “Dolby Noise Reduction Switch (DOLBY NR)
® Blank Skip Switch (BLANK SKIP)
® Playback Button ({ REV-PLAY-FWD » )
@ Stop Button (1JSTOP)
@ Fast Forward/Rewind Button (« FF/REW »)
@ Mixing Level Control (MIXING LEVEL)
® Record Muting Button (Q REC MUTE)
@® Record Standby Button (@ REC STANDBY)
® Recording Indicator (REC)
® Forward Indicator (FWD)
@ Tape Selector (TAPE SELECTOR)
® Timer Standby Selector (TIMER STANDBY)
® Microphone Jacks (MIC) 23.5, 0.8 mV, 200~600Q
Connect the Mixing Microphone to the left channel (marked [L)).
@ Power Switch (POWER)
@ Reverse Indicator (REV)
@ Power/Battery Check Indicator (POWER/BATT)
REAR PANELS
® External Antenna Terminals (FM ANT)
@® Line/CD Input Jacks (LINE IN/CD)
® Phono Input Jacks (PHONO)
© Phono Ground Terminal (_| )
@ Telescopic Antenna
@® Speaker Terminals (SPEAKER IMP 5-80)
Connect to the speakers with included speaker cables.
@® Battery Compartment
@ DC Input Jack [DC IN 13.2 VV (12-15V) O-5-@ ]
@ AC Socket (AC IN.)
@ Voltage Selector (VOLTAGE SELECTOR)
For U.S.A. only.
@® Female Connectors
Connect with included cables.
@ Line Output Jacks (LINE OUT)
Note:
The Blank Skip Function may not work correctly with some
pre-recorded tape, such as classical music where there are
many low sound levels. In this case set the Blank Skip
Switch to “OFF”.
SSS
ESS
ENS
less than 15 sec
(no skip)
aera Pre-recorded portion
Heese Blank portion
more than 15 sec.
-— Skip (Simulated Cue eo
Simulated TPS fees i
more than 4 sec.

RX-C300
DISASSEMBLY INSTRUCTIONS
Fig. 5 Fig. 6
the eject button,
the spring will go out.

RX-C300
Tuner circuit board
oe
o
AM
530
600
700
SCALE
0
2
y
2
STARTING
=
———
POINT
Display
circuit
board
(Q)
(R)
Fig.
11
Fig.
13
k
Cassette Dec
Front cabinet
Pull out the tape amplifier circuit board until it is possible to remove the
switch circuit board
Power transformer
Battery circuit board
Push the tooth and remove the circuit board in the direction of arrow.
Pull out the gear
Cassette holder Push the cassette holder in the direction of arrow @.
Remove the spring in the direction of arrow ©.
Front cabinet «1, 2
* 1. Turn the drum gear in the direction of arrow @ as shown in fig. 9.
*2. Set the pointer at the position as shown in fig. 13.
*3. The speaker box is made of a relatively soft material (9-mm-thick particle board). Be careful not to tighten the screws excessively when
attaching anything to the box in order not to damage the threads.
elf the threads are damaged, also use a bonding agent to attach the speaker box stopper to the speaker box so that the speaker box does not
fall when attached to the main unit (tuner amplifier block or cassette deck block).
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MEASUREMENTS AND ADJUSTMENTS
& ALIGNMENT INSTRUCTION
READ CAREFULLY BEFORE ATTEMPTING ALIGNMENT.
1. Set volume control to minimum.
2. Set graphic equalizer to center.
3. Set band switch to AM or FM.
4. Set balance control to center.
& MW and SW ALIGNMENT
Fashion loop of
several turns of
wire and radiate
signal into loop of
receiver.
455 kHz
30% Mod.
at 400 Hz
AM
AM
(5)
& FM ALIGNMENT
SIGNAL GENERATOR or
SWEEP GENERATOR
CONNECTIONS FREQUENCY
BAND
10.7 MHz
(SWP.)
High side thru.
0.001 UF to test
(1)
point 7 . Negative
side to test point W .
(2)
SIGNAL GENERATOR or
SWEEP GENERATOR
CONNECTIONS FREQUENCY
Tuning capacitor
Tuning capacitor CT6 (AM OSC
(* 1)Cement antenna bobbin with wax after completing alignment.
5. Set mode switch to stereo.
6. Set power source voltage to 15 V DC.
7. Output of signal generator should be no higher than
necessary to obtain an output reading.
INDICATOR
RADIO DIAL (ELECTRONICS
SETTING
VOLTMETER
REMARKS
‘ADJUSTMENT
“| T2 (AM IFT)
L7 (AMOSC
Coil)
or SCOPE)
AM-IF ALIGNMENT
Point of non-
interference. (on/
about 600 kHz)
Output meter
across voice coil
Adjust for maximum
output.
MW-RF ALIGNMENT
Adjust for maximum
output.
Adjust for maximum
output. Adjust L4 by
moving coil bobbin
along ferrite core.
Adjust for maximum
output.
Repeat steps
(2)~(5).
(*1)L4 (AM ANT
Coil)
CT3 (AM ANT
Trimmer)
INDICATOR
(ELECTRONICS
VOLTMETER
or SCOPE)
FM-IF ALIGNMENT
Connect vert.
amp. of scope to
test point Y .
Negative side to
test point 7 .
RADIO DIAL
ADJUSTMENT
REMARKS
SETTING
Point of non-
interference. (on/
about 90 MHz)
Adjust for maximum
amplitude.
(Refer to fig. 6).
T1 (FM 1st IFT)
Adjust for maximum
amplitude.
(Refer to fig. 7).
T3 (FM 2nd IFT)
(3)
Connect to test point 109.2 MHz
W through FM dummy
antenna. Negative
(4)
side to test point Y .
(5) 90 MHz
FM
FM
FM
FM
(6) po 106 MHz
(* 2) Three output responses will be present: proper tuning is the center frequency.
FM-RF ALIGNMENT
Output meter
Variable
: L3 (FM OSC ( * 2) Adjust for maxi-
capacitor across ‘
fully closed voice coil ce) EOD
Variable
CT2 (FM OSC "
capacitor ss anoss er)
fully open
mesma |_| :
( * 2) Adjust for maxi-
CT1 (FM ANT mum output.
Trimmer) Repeat steps
(3)~(6).

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& SEPARATION ALIGNMENT
FM SIGNAL
GENERATOR
SOURCE
CONNECTION
EQUIPMENT
CONNECTION
ELECTRONIC
COUNTER
ADJUSTMENT SPECIFICATION REMARKS
98 MHz, 60 dB (CW)
Connect to test point
W through FM dummy
antenna.
Negative side to test
point Y.
Adjust VR1, for 19 kHz
(+150 Hz) reading on electronics
counter.
Adjustment
of pilot
signal
@ AUDIO ADJUSTMENT
MEASUREMENT
ITEM INPUT POINT
ADJUSTMENT
SPECIFICATION POINT REMARKS
QZZCAC : ;
: Maximum Azimuth screw Playback mode
(1) a 20 ne} EXT SP (Refer to Fig. 2.) | (FWD and REV Playback)
WY... (Reh) Playback mode
mij genase aia dB) VY. (ich) 410+25 mV Me tee Tape switch ... Normal
, W... (-) Dolby NR ... OUT
Record mode
(3) Ese nn ¥: 2 180" 43 mV VR302 Beat proof switch— II
: dil Tape switch— Metal
; Use normal WY... (Leh) Normal 4.8 +0.2 mV Record mode
Bias VR101 (Lch) :
(4) and metal WY... (Reh) Beat proof switch II
current tape. W.(-) Metal 8.341.5mV | VR201 (Roh) Tape switch— Normal— Metal
1. Apply a —24 dB 1 KHz signal
from the line input terminal.
2. Measure the output voltage
of line output terminals.
3. Then, with the unit in the
record mode and,record the signal
Line IN VR102 (Lch) 4. Playback the recorded part,
(5) f=1 kHz, Output voltage VR202 (Reh) and measure the output
—24dB ...0+1 dB voltage of line output
terminals.
5. Compare the output voltage
measured in items 2 and 4,
and adjust so there is no
difference in the level.
(Adjust to obtain 0+1 dB.)
REMARKS
Use
oscilloscope.
Overall gain Line OUT
@ SPECTRUM ANALYZER ADJUSTMENT
MEASUREMENT
ITEM INPUT POINT ADJUSTMENT
1C204—Pin @ to @...(+)
CS2—Pin @...(—)
SPECIFICATION
less than +0.05 V
need adjustment —___
Limit voltage
adjustment
Do not supply
any audio signal.
need adjustment~
Total level ‘ snl Set graphic
fats
Line
In
Total
level
indicator
The
red
segments
are
not
:
indicator = : VR602 es equalizer to
adjustment ec AN [vee | Rarorneeas center.
@ TAPE SPEED ADJUSTMENT
COUNTER
Connect to earphone jack
ADJUSTMENT
1. Play back test tape (QZZCWAT, 3 kHz).
2. Adjust VR until 3000 Hz+90 Hz is read on the counter.
CAUTION (Refer to Fig. 9.)
Observe the following precautions when connecting a measuring device other than the accompanying speaker to an external speaker jack or a P.C.
Board.
Note:
When connecting an external measuring device to an output line, connect an electrolytic capacitor between them to cut the direct current. Also, the
positive (+) and negative (—) terminals of the left and right channels must be connected independently with respect to direct current and alternating
current. Be particularly careful that measuring devices connected to different channels and placed in close proximity to each other do not contact
each other.
Hf =
@ ALIGNMENT POINT
@Please refer to Circuit Boards and Wiring Connection Diagram which is located test point.
Total level indicator
R/P Head
FWD REV
Fig. 2
&)
Tape speed TAPE PHONO LINE. FM MODE FM AM
Ao 6P
Fig. 3 Fig. 4
é teat Overall gain
verall gain [VR202]
VRIO2
Bias current iQ)
VRIOI Bias current
e VR20l Fig. 6
Playback level Playback level
VRIOO VR200
Erase current Total level
Fig. 5
Output terminals of set
35 V 2200 x2
35 V 2200 ux2
+--+
AM IFT
455kHz
Fig. 7
Fig. 8
Oscilloscope
(Example of connection of external measuring devices)
Fig. 9
Vv Be sure to fold at the (V) mark so that mark is on the outside.
= 3
35 V 2200 ux2
AM ANT
SSOkHz
AMOSC
1650kHz
AM ANT
Limit voltage
VR6OO

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CIRCUIT DESCRIPTION
CP5-2(Rch) CP4-2
Tape Amp O IC 208
Power IC 200
Q401—404, e400 IC 209 its BPF.
VR400— 404 ;
4 Power
G.EQ | Ame
Circuit
| Q600 Q6I7
Q50!— 504, > -
VR500 — 504 <|
G.EQ
Circuit
VR505 Total Amp _
VR405,505: Volume, VR6OI: Balance 1C 205 e608
K
I2.5kHz B.P.F.
1c 207 Sampling Pulse Generator
jouBIS plsd
JaAlIQ
4019N 14
IC 206 IC204
|DUBIS aAl4ig juawbas
}OuUBIS aAIUg 4aLaW
DC-AC
Converter
Q61l2 ,613
T600
Fig. 1. Block Diagram
Display Principle of the Spectrum Analyzer
The output signal (tape playback, line, or radio signal) from the tape amplifier circuit board passes through the power amplifier circuit and then is
input to Q400 and Q500 on the graphic equalizer circuit board. The output from Q400 and Q500 is divided into two signals. One is input to the graphic
equalizer circuit composed of Q401—Q405, Q501—505, VR400—409, and VR400—404, and after its 100 Hz, 330 Hz, 1 kHz, 3.3 kHz, and 12.5 kHz
frequency components have been attenuated or amplified between —10 dB and +10 dB by the respective graphic equalizer controls, the signal is
fed back to Q400 and Q500 and added ito the original sound.
The other signal passes through the balance and volume controls and, in addition to being input to the power amplifier, it is sent through R404 and
R504 to the Q600 and Q617 amplifiers as a left and right mixed signal. The output of these amplifiers is input to the |C200—-1C203 band pass filter
and then is passed through a smoothing circuit composed of a diode and a condenser from which it is output as a DC signal. The selective
frequencies of the band pass filter are determined by the value of the CR attached to the outside of each IC.
IC Selective Frequencies
Output pin No. 1C200-8 1C200-2 1C201-8 1C201-2 IC202-8 1C202-2 1C203-8 1C203-2
Further, in 1C205 208 Hz signals each with shifted phases are made and output from pins 9-16. These are then sent to the |C207 grid driver and
Q601—608 sampling gates. The signal sent to C207 is inverted and then input to grids 1—8 of the F/L meter. The signal converted to a DC signal by
IC200-IC 203 and their peripheral circuits is input to sampling gates Q601—Q608, and when a low signal is then input to the base of each gate, the
gate closes and the signal is output to pin 4 of IC204.
The DC signal input to 1C204 is converted to a seven-step meter drive signal and input to 1C206, from which it is output to the F/L meter as a segment
drive signal.
In addition to the above grid drive signal and segment drive signal, a 322 Hz AC voltage is applied to the F/L meter by a DC/AC converter circuit
composed of Q612, Q613 and T600 and used as the power supply for the filament.
4.8msec
IC
207-18
FL
-
32,33
--H--4---+--+---]---]---F--
Grid
8
1 :
| |
ic207-17 1 ' FL-1,2
Grid 7 ' |
1 t !
1 i I
Ic207-16 | '
Grid 6 | ! i
bresiini cet
C207 152) 4 | 1 !
Grid 5 1 ! 1 I
1 H t
' | i |
Ic207- 14 | | 4 1 '
Grid 4 1 | | I
1 | ! eH
1 ! I
I | | 1 |
Ic207-13
|
\
\ \
Grid3 | | i ' 1
H 1 | Bes
\ ! \
ic2zo7-12 | | 1 : --
Grid 2 1 | : \ oe
7 1 :
\ ,
\ |
I
H |
Fig. 3. ‘‘F” Signal
8G 7G 6G 5G 4G 3G 2G IG
Ic207-11
Grid |
t WY WM.
Fig. 2. Timing Chart
:
1@,olwolo!wio! 1— NIGI SII OIA
Fig. 4. FL Tube
33)82| 31 |solecies|e7 |26|e5|2q[e3|29|21 |20] 19] 18|17/16|15] 14] 13|12| 1 [10] 9|8|7]6 [5 ]4| 3] 2]
8 i 6 5 4 3 2 |
Foe G |NC|NC] G |NC|NC|NC} G |NC/NC] G |NC/NC} G |NC/B7| G B5|G B3|B2| G F
Fig. 5. FL Tube Pin Assignment
ch
—~10—

IC2 BA4234L
AMOSC AMIN
IC1 RVITA7358P
iIC4 RVIBA328MR
PLL F
SEPARATION EEPIELER
CONTROL PLL FILTER
L OUT
R ouT (5)
LAMP FILTER
(16) vco
MONO
LAMP OUT
Ae3 RVITA7358P
fo Be8 BA4234L
CHECK (2) ‘is ceed Ce7 RVIBA1332L
+Vec De3 RVIBA328MR
mee © Be6 2SC1359B
D:8 2SA564R
Fe8 2SC1740R
E6 2SC1740R
E6 2SC1740R
Ce9 2SA564R
Be4 MA840B
Be4 MA165
Notes: BeG MA165
1. $18, S19: Band switch in ‘‘FM” position. ie ries el
(S18-1, S18-2...FM, S19-1...AM) Ess RVDOMTze6ReB
2. $22~S24: Function switch. E-8 MA165
(S22-1~S22-4... TAPE, S23-1~S23-3...PHONO,
$24-1~S24-3...LINE/CD)
3. S25-1, S25-2: FM Mode/Beat Proof switch in
“STEREO/I” position
(1... STEREO/I, 3... MONO/II)
4. VR1: VCO adjustment.
5. DC voltage measurement are taken with electronics voltmeter
from negative terminal of battery.
< >...FM,( )...AM, No mark... Phono
=== ) Voltage Line
eaaa=p FM Signal Line
c=» Tape/Phono/Radio/CD/LINE IN
Varicap Zener
Anode Anode
GND FMIFIN BYPASS AF OUT MUTE
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AGC
AM Vec AM MIXOUT AMIFIN BYPASS FM QUAD Vcc AMDET OUT AMAF IN GND
FM FRONT END
FM IF DET AM OSC IF
FM MPX
PHONO AMP.
FM IF AMP
MUTING
REGULATOR
BUFFER AMP
BUFFER AMP
SWITCHING
AFC
AGC
SWITCHING
TUNING IND
FM ST IND
ZENER
SWITCHING
General
Anode
TELESC
ANTENNA
SCHEMATIC DIAGRAM (Tuner
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(47KQ..0VER)
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&
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PHONO
EARTH
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Photo
Diode
NN
F
Cathode
Cathode
fit
Cathode
Anode Cathode
—12—

RX-C300 RX-C300
TELESCOPIC
ANTENNA
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5 DG O61010)
SCHEMATIC
DIAGRAM
(Tuner)
MODEL
RX-C300
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IC205 RVIM54832P-1
1C208, 209 AN7161N
2. VR400~VR404, VR500~VR504: Graphic equalizer
VR405, 505: Volume control
VR600: Limit voltage adjustment
VR601: Balance control
VR602: Total level adjustment
3. DC voltage measurements are taken with electronics voltmeter
from negative terminal of battery.
< >...Spectrum analyzer on
No mark... Tape (play)
a= @ Voltage line
mes AC/DC line
=» Tape/Phono/Radio/CD/LINE IN
2SA564R SAMPLING GATE
2SA564R SAMPLING GATE
2SC1383R REGULATOR
2SD1266P REGULATOR
2SC1740R REGULATOR
2SC2001L1 OSC ILLATOR
2SC2001L1 OSCILLATOR
2SA564R MUTING
2$C1383R REGULATOR
2S8C1740R MUTING .
2SC1740R AMP
MA165 AVC
MA165 AVC
MA165 RECTIFIER
MA165 RECTIFIER
MA165 RECTIFIER
MA165 RECTIFIER
MA165 RECTIFIER
MA165 RECTIFIER
MA165 RECTIFIER
MA165 RECTIFIER
MA165 AVC
RVDMTZ5R1B ZENR
MA165 RECTIFIER
MA165 RECTIFIER
RVDS4VB10F RECTIFIER
RVDS4VB10F RECTIFIER
RVDS4VB10F RECTIFIER
RVDS4VB10F RECTIFIER
RVDMTZ8R2B ZENR
RVD1SR35 RECTIFIER
RVDMTZ13A ZENR
RVDMTZ10A ZENR
MA165 SWITCHING
MA165 SWITCHING
eo oe
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R.F.MUTING = NF Vee As2 AN6561 BAND PASS FILTER AMP
As3 AN6561 BAND PASS FILTER AMP
Ac4 AN6561 BAND PASS FILTER AMP
eeors As6 AN6561 BAND PASS FILTER AMP
Input: [—el “rive Output D8 LB1407 LEVEL METER
Circuit Circuit Circuit (3) ouTPuT D+10 RVIM54832P-1 8 ch SELECTOR
Be8 RVIMSL915RS SEGMENT DRIVER
B-10 RVIMSL915RS GRID DRIVER
Head Phones! D6 AN7161N POWER AMP
Amp Output Sravectar G6 AN7161N POWER AMP
Det 2SC1740S G EQ AMP
De2 2SC1740R G EQ AMP
De2 2SC1740R G EQ AMP
De3 2SC1740R GEQ AMP
Head
Phones|
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De3
2SC1740R
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Circuit Circuit Boots Fel 2SC1740S GEQ AMP
TRAP Fe2 2SC1740R GEQAMP
Fe2 2SC1740R G EQ AMP
Fe3 28C1740R GEQ AMP
GND INPUT NF GND Fe3 2SC1740R G EQ AMP
(IN) (OUT) Co4 2SC1740R AMP
Be7 2SA564R SAMPLING GATE
Notes: Be7 2SA564R SAMPLING GATE
aaa cy as C7 2SA564R SAMPLING GATE
1. S26: Spectrum analyzer switch in ‘‘ON” position. C-7 2SA564R SAMPLING GATE
C7 2SA564R SAMPLING GATE
(1...ON, 3...OFF) C7 2SA564R SAMPLING GATE
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RA-C. K-CSU
CIRCUIT BOARD AND WIRING CONNECTION DIAGRAM (Tuner Amplifier) MODEL RX-C300
6 7
HEADPHONE
®
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8
tuner PCB
Graphic Equlizer PCB
Q400
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ANTENNA
1C206, 207

ODEL RX-C300
13 14 15 16 17 18 19 ELECTRICAL PARTS LIST
Numbering System of Resistor Numbering System of Capacitor
Vv
Displa
PC
Example
Example
play
PCB
ea
toe
GE
—_
ERD
25
F
J
101
ECKD
1H
102
z
F
1
—
a
—_—__——
—————vaes
Se.
ee
——————
Type
Wattage
Shape
Tolerance
Value
Type
Voltage
Value
Tolerance Peculiarity
9
(1009)
(1000
pF)
IC1
ERX
2
AN
J
2R2
ECEA
50
M
R47
9604
Type
Wattage
Shape
Tolerance
Value
Type
Voltage
Peculiarity Value
(2.2Q)
(0.47
yF)
-
» |
el
oo SF
ae
SERS
iii
te
4
=
w
_
ANTENNA
TELESCOPIC
1C206, 207 1C208, 209
a
D614~617
Q603
Q602
o
18
IC2
Cathode
D4,5
Resistor Type
ERD: Carbon
ERDS: Carbon
ERX: Metal Film
Important safety notice
Components identified by mark have special char-
actristics important for safety.
1C206,207 RVIMSL915RS Integrated Circuit
1C208,209 AN7161N Integrated Circuit
IC901 LM6417E543 _— Integrated Circuit
Ic902 DNG6838A Integrated Circuit
TRANSISTORS
Qi 2SC1359B Transistor, Si
Q4,8,303,308,319,322,601, 602,
603,604,605,606,607,608, 614
2SA722-S Transistor, Si
Q5,6,7,104,106,107,108,109,
110,111,204,206,207,208,209,
210,21 1,307,309,312,316,317,
318,321 ,323,324,325,401,402,
403,404,501 ,502,503,504,600,
2SD1266P Transistor, Si
2SC2001L1 Transistor, Si
2SD592R Transistor, Si
2SB1030Q Transistor, Si
2SA1115 Transistor, Si
2SB621R Transistor, Si
DIODES & RECTIFIERS
MA840B Diode, Si
D2,3,9,101, 102,103,201 ,202,
203,301 ,302,307,308,309,310,
311,312,313,314,315,316,317,
318,321 ,322,323,324,325,326,
331,332,333,600,601 602,603,
604,605,606,607,608,609,610,
612,613,627,630
MA165 Diode, Si
D4,5 LNO21244P LED
D8,319 RVDMTZ6R8B Diode, Si
...For U.S.A.
Capacitor Type
ECET: Electrolytic
ECEAQOON: Non Polar 25 + :254V.
Electrolytic 16: 16V
908,909,910,911
RVD1SS133 Diode, Si
COILS
RLD4Y44 Antenna Coil, FM
RLD4Y5 Oscillator Coil, FM
RLF2D143 Bar Antenna, AM
RLA3B44 Coil, SW Ant.
L11 RLQZB101K Choke Coil
L101,201 RLE5031 Coil, Filter
L102,202 RLQZM473J Choke Coil
L103,203 RLQZD822J Choke Coil
L301 RLQZB221K Choke Coil
L600, 601,602,603,604
RLQZB101K Choke Coil
THERMISTOR
TH301 RRT202 Thermistor
VARIABLE CAPACITOR
vei RCV4LC2R1A Tuning Capacitor
TRIMMER CONDENSER
CT4 RCVPL5A Trimmer Capacitor
CT5,7,8 RCVTZ11F Trimmer Capacitor
VARIABLE RESISTORS
VR1 EVND4AA00B14 Variable Resistor, 10 kQ (B)
VR100,200 EVND4AA00B52 Variable Resistor, 500Q (B)
VR101,102,201 ,202
EVND4AA00B15 Variable Resistor, 100 kQ (B)
VR301 EWASFO0C95A14 Variable Resistor, 10 kQ (A)
VR302 EVND4AA00B24 Variable Resistor, 20 kQ (B)
VR400, 401, 402, 403, 404,
500, 501, 502, 503, 504
EWASA2C95G54 Variable Resistor, 50 kQ (G)
[C]. ..For Canada.
—20~—
ECEA: Electrolytic : +0.25 pF
Bh Loe tebe ECCD: Ceramic 1A: 10V| 1:100V. |J: 5%
. (Chip Type) ECKD: Ceramic 1C : 16 V|DKC : 400 VAG K : +10%
1
yp
ECQM:
Polyester
1E
:
25V
Z
:
+80%,
Q60! 3 1H: 50 V -20%
1346 REPLACEMENT PARTS LIST ECQP: Polyproylene a aoe Pesibym,
: -0%
IC3
Tolerance
8608 When replacing any of these components, use only QCU CO: Ceramic (Chip Type)
> manufacturer's specified parts. ECUX: Ceramic (Chip Type)
10205 8
1C4
7
Q407
INTEGRATED
CIRCUITS
D303,304,305,306
*
VR405,505
EWAPA1C10A54
ZA
p
RViTA7358P
Integrated
Circuit
LN041245P
LED
Variable
Resistor,
50
kQ
(A)
|
E
LA
BA4234L
Integrated
Circuit
D327,619
VR600
EVND4AA00B14
Variable
Resistor,
10
kQ
(B)
.
(ope
RViBA1332L
Integrated
Circuit
RVD1SR35
Diode,
Si
|
Qi,
4~8,
RViBA328MR
__Integrated
Circuit
D330,623
RVDMTZ13A
Diode,
Si
VR601
EWASJ2C95G54
Variable
Resistor,
50
kQ
(G)
400~404,
AN6205
Integrated
Circuit
D611
RVDMTZS5RI1B
Diode,
Si
VR602
EVND4AA00B15
Variable
Resistor,
100
kQ
(B)
0406,
500~504
RViBA338
Integrated
Circuit
D614,615,616,617
;
600~
608.
RViLM1131C
—_Integrated
Circuit
RVDS4VB10F
Diode,
Si
~ oa gia 611~614. 1€200,201 202,203 + = D618 RVDMTZ8R2B Diode, Si CERAMIC FILTERS
‘Xe,
ww
a
’
AN6561
Integrated
Circuit
RVF107WMZ
=
Ceramic
Filter
Sehamacl]
|
616,
617
ircui
cca
maaameed
|
.
s
C204
LB1407
Integrated
Circuit
D624
RVDMTZ10A
_
Diode,
Si
RVFSFZ455B
—
Ceramic
Filter
405 1C205 RViM54832P-1 Integrated Circuit D901 MA4068L Diode, Si
a
D902,903,904,905,906,907,
FILTER
Z1 RXABPWBS5 B.P.F.
FLUORESCENT LEVEL METER
FL1 RADBG271ZS Display, LCD
SWITCHES
$1,2,3,4,5,6,11
EVQQS405K _ Slide Switch FWD, REV, Stop,
Rec Mute FF, Rew, Rec Standby
Push Switch, Blank skip On/Off
SPE ANA. On/Off Dolby NR In/Out
Push Switch, Reverse Mode
Switch, Power
Switch, Voltage Selector A
$7,12,26 RSH2B24T
$8,9,10 RSHX073Z
$14 RSH2B37Z
S16 [M] RSR4A08Y
(For U.S.A.)
i Si7 RSS3F13Z Switch, Tape Selector
~
}
Anode
611,616,617
28C1740R
__Transistor
Si
a
PLEAS
green
$18,19,21,22,23,24
oa
Di~3,
8,
9,
TRANSFORMERS
RSHX074Z
Switch,
Function
|
600~610,
612,
Q101,102,201,202
;
RLi4B153
L.F.
Transformer,
FM
$25
RSS3A12Z
Switch,
FM
Mode/Beat
Proof
,
613,
618,
619,
ZSC1845E
‘Transistor,
Si
RLi2B153
LF.
Transformer,
AM
$901,902
RSH1A46Z
Switch,
Rec
Check
:
623,
624,
627,
Q103,203
2SC1788RDR1_
Transistor,
Si
RLOOC34
Oscillator
Coil
$903
RSH1A47Z
Switch,
Mode
630
Q105,112,205,212,301,302,
ee
T302—M]
RLTSZ5M1A
Power
Transformer
/\
RSHX0742
313,400,500 2SC1740S Transistor, Si (For U.S.A.) JACKS
ZSCeOUIKT Transistorscs T302(6} © RLTSZSC1A —_ Power Transformer A RUF1091Z Jack
1
2SC1740LNR
Transistor,
Si
(For
Canada.)
RJF1087Z
Jack
(
Anode
2SA886
Transistor,
Si
T600
RLT9F3B
Oscillator
Coil
RJJ1D27Z
Jack,
Headphones
“
Cathode
2SC1383
Transistor,
Si
CD/AUX
J7 (S15) RJJ1D20Y Jack, AC In A
J8 RJJIF1TY Jack, DC In

RX-C300 RX-C300
IC1 02 RVIBA338 Notes: 5 Ref No. Zone Part No. Function Name
SENSE TIMING PULSE WIDTH vec 1. S1: Forward switch. iain i ae amid
116,124,132, 5 : F :
penne Sor ERD2Fsi02 | 216,224,282 ECFTIE473KD saclaue 2. S2: Reverse switch. Ic102 E.7 RVIBAS38 TPS
apn n 19,219,309 ECFT1E472KD 3. S3: Fast forward switch Ic103 B+9 RVILM1131C DOLBY
362,432,532 ERDS2TJ473 353,624,678 ERD25FU561 | C119,219,309 . $3: i . teed ae Divi NEGREONT
R3,4,109,123, R370 ERC12ZGM335 bated lhe ae 4. S4: Rewind switch. 1C902 Fea DN6s38A DIRECTION DET.
8 209.223. R4 DS2TJ474 127,222,223,226, f aio1 Aed 2SC1845E SWITCHING
128,209,228,
ees
227
349
ECEA1EU4R7
5.
$5:
Rec
mute
switch.
aioe
As?
28C1845E
SWITCHING
Saree ete 507,600,652,653 130,230 ECKD1H222MD 6. S6: Stop switch Q103 Ae2 2SC1788RDR1 pate
sai? ‘AEE RERIBE?: f a Soe . 104 Acé 28C1740R wi
R7,59 ERDS2TJ330 B51,655,656,694, pba pase 7. S7: Blank skip switch. ios D6 28C1740S AF AMP
RB, 18,20,22,26, 658,659 ERDS2TJ124 | C1S3.288 cclilaamaaaiaad -R d itch in“ t two-side playback or Q106 D+10 28C1740R SWITCHING
33,418,518 = ERDS2TJ101 | R404,504,673, eee 8. S8~S10: Reverse mode switch in “repea play 107 De10 28C1740R SWITCHING
R9,10,108,208, 903 ERDS2TJ393 345 ee two-side recording” position. Q108 +11 28C1740R RECMUTE
Rit
a2s
16,47
leila
R408,417,508,
iss
re
ECPoAt
82JZ
(S8...repeat
two-side
playback
or
two-side
recording,
S9...two-
aie
Belt
28C1740R
SWITCHING
1,122,125, as BRDS2 306 ECGP2A103)2 side playback or two-side recording, $10...one-side playback or an Bei 28C1740R SWITCHING
60,61,122,125,
R413,513
ERDS2TJ823
C307,327,335
ECEA1AU221
NOISE
FILTER
=
GND
our
Q112
Be12
28C1740S
pala
130,134,140,145, R433,533 ERDS2TJ181 ah : one-side recording) 201 Be2 2SC1845E
reranten reIs Dg Geieazs -ECEATAUArI 9. S11: Rec switch eb ee ee
pate ogee eb 628,092 687, C317 RCBS1C472MXY , ‘ sal a204 Be6 2SC1740R SWITCHING
emersaaney CA2,650 ERDS2TJ334 | 318,330,333 | ECEA1AU470 10. S12: Dolby NR switch. 205 C.6 28C17408 AF AMP
349,355,649,672,
R609,619
ERDS2TJ182
Lana
IC1
03
RVILM1
1
31
Gc
_D-
;
in
“OFF”
iti
Q206
Ae10
2SC1740R
SWITCHING
C320,322,653, 11. $14-1,$14-2: Power switch in position.
685,689,692,912 ERDS2TJ103 R622 ERDS2TJ184 cane HUR22 SENSE TIMING PULSE WIDTH vec ; : Q207 As10 28C1740R SWITCHING
R13,14,48,52,53, R625 ERDS2TJse4 | 654 ECEA! 12. S15: AC/DC selector switch. 208 E40 28C1740R REC MUTE
ee RedSove enDsaTzod_ | CHIREIOO0 ECE Nan 18. S16: Voltage selector switch. fi] (For U.S.A) ora emery) ia eee
226,313,347,
7
ERD2FCJ3R3P
:
:
:
De
cias
3
:
354,365,410, Bere ERDS2TJ222 ‘| ©344,643,661, 14. S17-1~S17-4: Tape selector switch in “NORMAL” position. Get Beit ac i708 Swnraane
ro iad ERDS2TU104 Rene ERDS25F ro im Spor (1...NORMAL, 2...CrOz, 3...METAL) Q301 C2 2SC1740S MUTING
669 R695 ERDS2TJ220 Th ss tie ahs ke ” ee Q302 E63 28C1740S SWITCHING
R17
ERGIANJP101
|
901,910,911
ERDS2TJ102
|
C347.981,628
REBSIHTONES
15.
S18:
Timer
standby
switch
in
“OFF”
position.
aero
na
paar
pane
R19,41,54,55 ERDS2TU224 R902 ERDS2TJ683 ee ss oe siete (1...PLAY, 2...OFF, 3...RECORD) 304 Dea 282001 BIAS OSC
R21,45,58,63, pare iataceh ica 380 RCBS1H100JC 16. S901, S902: Rec check switch. Q306 De4 2SC1740LNR MIX AMP
357,674, ERDS2Tu470 | 904,905,906, Be ae int ; : esos ae eed ors ee aap
R24,112,131, 907,908,909,913 ERDS2TJ472 Sy ashen eceninnin 17. S903: Mode switch. asne qa Berean SWITCHING
RDS2TJ684 | A912 ERDS2TJ103 502,504, : ; : Q309 F +7 28C1740R
ce 318 e RO14 ERDS2TJ682 405,410,505 ECFT1E473MD 18. VR100, 200: Playback level adjustment ose ces pat ea pale
335,676
ERDS2TJ471
VR101,
201:
Bias
current
adjustment.
te
ar
ees
necuLaTER
4 : : . 2SC1740R SWITCH
R27,42,108, CAPACITORS Carer ECeTI Speen NOISE FINE By ENO eu VR102, 202: Overall gain adjustment. eae ant 28C1740R SWITCHING
734,100,101
we
Loe
2
€408,508
ECEA1HUR22
VR302:
Erase
current
adjustment.
gate
pez
2801740
SWITCHING
103, 104,111,200, es ” ECKD1H103MD oe 511 meer alain 19. DC voltage measurements are taken with electronics voltmeter Q320 Ho13. 2SA886R REGULATER
’
‘
;
:
321
He13
2SC1740R
REGULA
pelicon pened eS i ine RCBSIHSROKL | C419512 ECFT1E223MD from negative terminal of battery. ae Bel Pa SwreHine
LA eet lel ,7,90,64,65, 413,513,522, H i Q323 H-9 28C1740R SWITCHING
627 ERDS2TJ222 | 602,607,610,613, ECEAICU100 e ’ 35 ieee < >...-Recording, [ ]...No signal, : ase Hg perce alee
Pe
atk
C8,73,74,657
ECCDIHIOIK
|
C414
415,514
(_
)...Signaled,
<<
>>...atthe
“OFF”
moment,
eet
ie
2sorraan
ara
605,607,616, Pea wey Q901 Go4 2
617,623,630,631, oth ms tea 518 ECGMIHDeTe | 18 ECEA1CU470 e...Dolby ON, ©...Dolby off, ((_ ))...recorded part oe en ee SWITCHING
12,418,518,
F
—
‘
T
636,644,661,662,
642,660,906,914
ECKDIH471KB
|
c416.516,626
|
ECEAQJU470
{[_
]]..-unrecorded
part,
©
...
Pully—moving,
(0...
Pulley—stop
30s
G2
2SAIt1SE
SWITCHING
663,664,665,666,
C13,14,45,46,60,
C417.517
ECEA1VU101
20.
Battery
current:
No
signal...280
mA
(display
off)
a906
G2
2SB621R
SWITCHING
ee EnDS2T 62 | 92 ECEAIHU4R7 =| 419,426,519, A (disol D101 C8 MA165 SWITCHING
R87,56,57, 526. | | ~=«-ECQG1H104KZ 450 mA (display on) D102 Deg MA165 RECTIFIER
141,142,241 242, C15,16,61,66 ECFTIE103MD | G459 402.500 Maximum output...3A (radio) D103 D9 MA165 RECTIFIER
323,336,358,647, C17,18,36 ECFT1E333MD ae ee D201 Be8 MA165 SWITCHING
23. 522,665 ECQV1H223J2 2.8A (playback) D202 Ac9 MA165 RECTIFIER
901,910,911 ERDS2TJ102 C19,78,303, 423,523,524 ECEA1CU330 ° ates Ae Mies BeeueR
mee ERDS2TJ821 | 668,669,672 ECEAQJU101— | C475.505 ECEA1EN220 2.7A (recording) Babi C.3 MAI6S SWITCHING
C€20,22,37,38, C509 RCBS1C472MX D302 Ce3 MA165 SWITCHING
R40,312,319, 659,673,911 ECKD1H102MD | Cé09 601 ECQV1H154JZ D303 He LNO41245P LED
368,371,606,671 ERDS2TJ221 pare SCRALAUIT so hee [NOAIDAED LED
R43,50,113,
C21
ECCD1H180KC
C604
ECEA0JU101
Bae
ne
CNBAoee
i
213,321
322,344,
C23,27
RCBS1H180JC
|
CEs
ggg
ECQV1H823UZ
D0?
Fe
MA165
SWITCHING
oie scl 24,51 ECCDIH470KC | ceog.609 ECQM1H223JNV D308 He7 MA165 SWITCHING
SE PtG Cee eeooeriss! _ 1 C26 ECCD1HO30CC | c¢11'612 ECQM1H822JV D309 G7 MA165 SWITCHING
R44,115,137, C29 ECCDIHOSODC | 6614'617,.618 D310 He7 MA165 SWITCHING
215,237, ERDS2TJ822 | C32510,655, aii asa erento perp Hee aes ela
R46,316,327,406 Gel D312 He8 MA165 SWITCHING
Peper 656 ECFTIE473MD | c615,616 ECQM1H222JV
409,412,415,506, i D313 He8 MA165, SWITCHING
512,515,641. CAD,67,68,72,75, C619,620 ECQP2A821JZ D314 E68 MA165 SWITCHING
509,512,515,641 ERDS2TJ682 | 76.77.370 eckpintoszr | 0619.620 SreSeyeecdicd bard E+8 MAI6S SWITCHING
Sao ape C627 ECFT1C333MD wz» ...Record ===ms ...@ Voltage line 0316 Hie MAt65 SWITCHING
oat 63,901 ECEA1HU010 A1CU102 PI i D317 E-9 MA165 SWITCHING
227,346,367,670, C47,48,53,54 ECFTIEZ2aMD | COS taper ——» «.-Playback ; === ...@ Voltage line psi ee Maree SWITCHING
690
ERDS2TU333
|
cag
ECFTIE1S3MD
|
Goa,’
ECEHICIGAID
==»
-.-Tape/Phono/Radio/CD/
Using
with
AC
cord:
AC
ee
mak
ie
Naa
pa
cae
ee aes See, |,case ECEA1AU101 LINE IN Using with DC IN or battery: DC |psze Delt MA165 SWITCHING
piel cs6 ECCD1H331K C648 ECEA1EU330 D323 Dett MA165 SWITCHING
621,020,040 BADS24i272 cs7 ECEA1AU101 C649 ECEA1HU4R7 D324 Dell MA165 SWITCHING
R116,216,681, C58 ECQGIH102KZ | CEs ECEA1AU221 D325 C12 MA165 SWITCHING
682 ERDS2TJ122 c59 ECEA0JU221 C651 ECEA1AU102 D326 Het2 MA165 SWITCHING
Coe ECEAQUW7O | Gasp _—ECFTTESEOMD IC901 LM6417E543 Geer ame, Sale
R118,218,604, 79,907 ECCDIH221K | Gogg ECEA1CU470 nee a ae Pema
608,615,618,629
ERDS2TJ274
ECQV1H102MD
|
Goo3
ECSF1AE106
Pca:
SCAN
@2
G)
ppo:
TPSIN
D332
He9
M165
SWITCHING
119,143,219, 100,200 ECEA50MiR eo0e RCBSIC1O3NY : IC902 DN6838A Baas a ige SWCHING
243,302,342,352, C101,110,125, Coos ECEA1CU101 PC2: SCAN @?) (2) PD1: REC STANDBY LED Basi Gis MAaOESM: REGULATER
405,505 ERDS2TJ223 135,201 210,225, c9i1 ECKD1H152MD PC1: SCAN () PD2: REV PLAY LED 11.Vee D902 Fe4 RVD1SS133 SwircHaNa
B20 Ses Ses 235,310,324,339 ECEA1HU010 RCBS1H102KB PCO: SCAN (19) (4) PD3: FORWARD PLAY LED D903 Ge3 RVD1SS133 sw
220,238,239 ERDS2TJ332 SiH22ikB | C912 D904 He3 RVD1SS133 SWITCHING
1238,
C102,105,202,
RCB:
C913
RCBS1H471KB
PAS:
INPUT
(8)
©
osc:
cLock
osc
Hall
3
D905
Fet
RVD1SS133
SWITCHING
R121,124,129,
205,311,902
mit
ae
Gs
oe
ae
Toisas
SWiTcHING
133,136,144,221, C103,203 RCBS1H821KB IC dieses Sa EvBIsaice SWITCHING
224,229,233,236, C104,117,204, PA1: INPUT (16) (7) PE1: MOTOR OUT {lpsos ess AVDiEs (a3 SWITCHING
244,304,308,309, 217 ECKD1H102MD PAO: INPUT (5) (8) PE2: FF/REW PLUNGER OUT 2 D909 Fe2 RVD1SS133 SWITCHING
328,334,338,341, C106,121,206, VDD: POWER SOURCE (72) PES: PLAY PLUNGER OUT Vop D910 Fe2 RVD1SS133 SWITCHING
359,369,402,502, 221,340 ECFT1E333KD RST: RESET (3) (0) TEST 0911 G3 RVD1SS133 SWITCHING
634,635,638,679, C107,207,325 ECEAQJU330
Vss: GND
680,904,905,906, C108,208 ECEA1HUR47 INT: REEL ROTATION (12) Qt) Vss
907,908,909,913 ERDS2TJ472 C109,209,337 ECEA1CU220 DETECTOR
R132,232 ERDS2TJ681 111,211 ECFT1E332KD
R135,235,326, C112,118,129,
332 ERDS2TJ151 212,218,229,319,
R300 ERDS2TJ1RO0 321,323,328,334,
403,503 ECEA1CU100
R305,684 ERDS2TJ2R2 113,213 ECEA1HKOR1
R306 ERDS2TJ155 114,134,214,
R314 ERD25TJ106 234 RCBS1H101KB
R317,360,373 ERDS2TJ820 115,120,128,
R325 ERDS2TJ184 215,220,228 ECEA1HUR33
94 = vV —22—

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Photo Diode
Varicap Zener General
Anode Anode Anode
-—s
Cathode Cathode
Anode Cathode
—23—
Vv
—24—
T302
A\!20V, 60Hz
For Canada.

CIRCUIT BOARD AND WIRING CONNECTION DIAGRAM (Cassette Deck) MODEL RX-C300
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Logic
PCB
For
Canada
@... To Power Amp PCB
7302
POWER
TRANSFORMER:
Tape Amp PCB f
A
0325 «Qs = 204. Q104.
Q212
Qn2
LED
PCB
gata
10:
Qu10
Q210 -
Q205
342
Qrtt
Q319
a)
Q318
fend Q107
if Qu
8106
Qa1e
Q317 Ce ay 10103
MOTOR
4309 Q207
Q206
I
T1010
11
fing R/P_ HEAD
ERASE HEAD
El 9 8305
Switch PCB |
7 oS 31 16,
HA calpain
2 8302
a PNK
0208 SLD
a WHT
ios 203 03 «303 «=S 306» 307
8 ae
Pe
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CIRCUIT BOARD AND WIRING CONNECTION DIAGRAM (Cassette Deck) MODEL RX-C300
7 8 9 10 11 12 13 14 15 16 17 18
Power Source PCB
For Canada
@... To Power Amp PCB
7302
POWER
TRANSFORMER:
prcccnn-
Tape Amp PCB
0325 «QS = 204 104.
Qn10
Q205
ant
Q107
8106
IC 103
Q207
Q206
ah)
ne ERASE HEAD
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connecting PCB
y Gang YY 9209 ai09 Gen aor Ai02 fener — UW 10101 MIG MIX 0301
—26— } OF —
|RX-C300
Via
Ecs
Q101~112,
201~212,
301~309,
312, 313
316~319,
321~325,
901, 906
E
CB
Q903, 904
wa
Cg
Q905
a
Anode
D101~103,
201~203,
301, 302 ,
307~319,
321~327,
330~333,
902~911
ag
Faia
D901

RX-C300 RX-C300
CABINET PARTS LOCATION
K52, K55
K51, K54 K47 K53, K55, K106 K121 K89 K87
V4
K123, 124
- K86
&3——— K85, K84, K54
K90 K88 Gy
K27 K43 K44 K46 K44
[M]...For U.S.A. =
[C]. ..For Canada.
a
CABINET PARTS K51 RJS3L3Z Socket (3P) CS16 K123 XTV3+8BFN Screw, Heat Sink M’tg
K1 [Ml RYM1XC300M Front Cabinet Ass’y, Deck K52 RJS7L4Z Socket (7P) CS7, 9, 11 K124 RMY191Z Heat Sink, for Q610
(For U.S.A.) K53 RJSOL4Z Socket (9P) CS10
K1 RYM1XC300MC Front Cabinet Ass'y, Deck K54 RJT707Z Terminal, Socket
(For Canada) K55 RJT807Z Terminal, Socket
K2 mM] RYF1XC300M — Rear Cabinet, Deck K56 RMY202Z Heat Sink, Q320
(For U.S.A.) K57 XTV3+6BFN Screw, Heat Sink etc. M’tg
K2 RYF1XC300MC Rear Cabinet, Deck K58 RUS548Z Spring, Tuning Knob
(For Canada) 7 K59 RDG5777Z Gear, Tuning Knob
K2-1 RJC5001Z Battery Spring (+/—) K60 RDG5778Z Gear, Dial
K2-2 RHK20Z Screw, Speaker Hanger ‘
K3 RYQXC300FX Cassette Holder Ass'y KG] RDE (462 Rack, Dial
K4 RYPXC300FX Cassette Lid Ass'y K62 XSN26+6 Screw, Dial/Gear
K5 RYM2XC300M ‘Front Cabinet, Tuner, Amp K63 XWA26B Washer, Dial Gear
K6 RYF2XC300M Rear Cabinet Ass'y, Tuner, Amp | K65 RHR12652 Bracket, Volume
K6-1 RHK20Z Screw, Speaker Hanger K66 RDP285Z Pointer, Dial
K6-2 RJT1013Z Terminal, Telescopic Ant. K67 RBC7032Z Button, Spectrum Analyzer
K7 RYHXC300M Handle Ass'y K68 RBC710Z Button, Function
K7-1 XTC3+8CFN Screw, Handle M'tg K69 RBD3212Z Button, Volume
K7-2 RHM191Z Shaft, Handle K70 RBD322Z Button, Balance
K7-3 RKX326Z Handle K71 RBD323Z Button, Graphic EQ.
K7-4 RKX327Z Arm, Handle :
K7-5 RKX328Z Cover, Handle K72 RBT182X Knob, Tuning
K7-6 RKES505Z Lock Angle K74 XEARRI175FAK Telescopic Ant.
K7-7 RUQ20Z Spring, Handle Release K75 XSN3+8BNS Screw, Telescopic Ant M'tg
K8 RYYXC300FX Joint Ass'y K76 XWAS3BFN Washer, Telescopic Ant M’tg
K77 XWG3FN Washer, Telescopic Ant M'tg
K11 RSE116Z Counter K78 RJF1095Z Terminal, Ext Ant, Earth
K12 RUB364Z Bracket, Eject K79 RJC511Z Battery Spring
K13 RUB365Z Bracket, Eject Button K80 RJS7L3Z Socket (7P) CS1
K14 RBD319Z Knob, Eject K81 RJP9G3Z Plug (9P), CS3
K15 RUQ23Z Spring, Eject Button Pp AC Ki N G S
Ki6 RUW42Z Spring, Cassette Holder K82 RJSSM3Z Socket (5P), CP6, 8
K17 RDG5728Z Gear, Cassette Holder i oer rad heres
K18 QDB0288 Counter Belt (Square) ockel REPLACEMENT PARTS LIST
Ki9 XTB3+10BFN Screw, Socket M'tg 34 aliens diye ae ti
: ; a : ;
a i a K87 RUS13L12Z Socket (13P) CP4 Important safety notice
kK24 XTV3+10G Screw, Mechanism etc. M'tg K88 RJSOM1Z Socket (9P), CP3 Components identified by A mark have special
K22 XTN3+12B Screw, Eject Bracket M't K89 QJT1104 Terminal, Speaker istics i
~ } K23 XWG3 Washer, Eject Bracket Mig Ks0 XTV3+12BFN_ Screw, Heat Sink M'tg patie Uaaaergl for safety.
K62. K63 = x K24 RBC702Y Button, Dolby K91 EAS16PL262S Speaker, Woofer en replacing any of these components, use
: ; K100 K25 RBC702z Button, Reverse Mode only manufacturer’s specified parts.
ja a te er
peli K104 K28 RBD279Y Knob, Timer Standby, Tape Selector] K94 RWEXC300FX Tweeter Ass'y :
_7~°—~k100 K29 RBD320Z Knob, Mixing Level Kes RHS7222 Cover ACCESSORIES
dear Ki04 K30 RDS5123Z Spring, Button K96 RKF9029Y Speaker Box (L) Ass'y Ail] RQX4615Z Instruction Book
ss'y K97 RKF9029Z Speaker Box (R) Ass'y (For U.S.A.)
are) K18 K21 Ki1 K13,K14,K15 K31 RBC704Z Button, FF/REW K98 SJFS5204 Terminal, Speaker Ai] RQX4616Z Instruction Book
ontrol K32 RBC705Z Button, Play K99 SKW161-2 Bracket, Speaker Box (For Canada.)
‘ontrol Lever K33 RBC706Z Button, Stop K100 RHG317A Rubber Cushion A2 RJPOG1Z Joint Cord
»tte Holder K34 RBC707Z Button, Rec Mute K101 RGE83Z Stopper, Speaker Box A4 RJE123Y Speaker Cord
K35 RBC708Z Button, Rec Standby ; ‘ AS|M] RJA22X Power Cord, AC A\
K36 RKK226Z Battery Cover K102 RYMS3XC300FX Speaker Grille (R) Ass'y (For U.S.A.)
K37 XBA1C50NU100 Fuse A K103 RYM4XC300FX Speaker Grille (L) Ass'y AS(C] RJAQ5Z Power Cord, AC A,
xt K38 QTF1054 Fuse Holder K104 XMM31+13FZ Screw, Rubber Cushion M'tg (For Canada.)
) Select K39 RJP2G10Z Plug (2P) CP17 K105 XMS31+13FZ Screw, Stopper
ip Select Lever K40 RUP2G4Y Plug (2P) CP13, 15 K106 RJP9G10Z Plug (9P) CP91 PACKINGS
id K67 K107 XMM35+-13FX Screw, Squawker Mtg Pi RPN9499Z Pad Complete
Block M'tg Kai RUP3G10Z Plug (3P) CP12 K108 RMC1024Z Shield Cover, Mechanism P2ml RPK2038Z Gift Box
Block M'tg K42 RUP3G4Y Plug (3P) CP16 K110 RUV736Z Cover, Battery (For U.S.A.)
ioard M'tg K43 RJP5G10Z Plug (5P) CP11 Ki14 XTN2+3B Screw, Shield Cover M'tg P2ic] RPK2039Z Gift Box
ioard M’tg K44 RJP5G11Z Plug (5P) CP6, 8 K115 RMC1000Z Shield Cover, FL Circuit (For Canada.)
K45 RJP7G10Z Plug (7P) CP18 P2-1 RPE569Z Handle, Gift Box
1M'tg K46 RJP7G11Z Plug (7P) CP7 K116 RMC1001Z Shield Cover, FL Circuit P3 XZB45X45A01_—- Polyethylene Cover
sh M'tg K47 RJS13L12Z Socket (13P) CP5 K117 RHG2075Z Rubber, FL Tube XZB40X60A01 Polyethylene Bag
M'tg K48 RMK157Z Bracket, Socket K119 RUP1908Y Printed Circuit Board RQE13Z Label
K49 RJS2L3Z Socket (2P) CS13 K121 RMY198Z Heat Sink, C208, IC209 RPH474Z Soft Cover
K50 RJS2L4Z Socket (2P) CS17 K122 RMY199Z Heat Sink, IC208, IC209 RPP682Z Polyethylene Cover
K115 K117
K81 K28
—29—
K21 K22, K23
am [MI [C]
A.M Printed in Japan ©

ORDER NO. GAD8508017A2
Service Manual
Radio Cassette
Portable
Stereo
Component
System
RX-
C3
0
¢
(
Black)
This is the Service Manual
for the following area.
...For Audio Club.
[
Please
use
this
manual
together
with
the
service
manual
for
model
No.
RX-C300
[mM]
order
No.
GAD85032238C1
|
eThis Service
Manual
indicates
the
main
differences
between;Original
RX-C300
[Mjand
RX-C300
MZ
For
Audio
Club.
& PARTS COMPARISON TABLE
Notes: 1. Important safety notice.
Components
identified
by
A.
mark
have
special
characteristics
important
for
safety.
When
replacing
any
of
these
components,
use
only
manufacturer’s
specified
parts.
2.
Please
revise
the
original
parts
list
in
the
Service
Manual
to
conform
to
the
changes
shown
herein.
If
new
part
numbers
are
shown,
be
sure to use them when ordering parts.
Ref.
No.
Description
RX-C300
[i]
RX-C300
[MZ]
;
(Original)
(NEW)
K47,
87
Socket
(13P)
CPS,
4
RUS13L12Z
RUS13L12Y
Joint
Cable
(Connector)
RJPOG1Z
RJPOG1Y
CHANGED
©Note: = So Te
The
joint
cable
currently
used
in
RX-C300
to
connect
the
Tuner
Amplifier
and
Cassette
Deck
sections.
We
have
modified
the
joint
cable
connector
and
socket
shapes
for
improvement
of
product
performance.
Modified
joint
cable
and
socket
pairs
are
available
as
replacement
service
parts.
When
replacing
the
old
jack
in
both
the
Tuner
Amplifier
and
Cassette
Deck
sections
with
a
new
one,
be
sure
to
replace
the
new
joint
cable,
too.
K47,
87:
socket
(CP5
and
CP4)
a
2
Changed
PREVIOUS TYPE NEW TYPE
Remarks
@ CAUTION
Observe
the
following
precautions
when
connecting
a
measuring
device
other
than
the
accompanying
speaker
to
an
external
speaker
jack
or
a
P.C.
Board.
Note:
When
connecting
an
external
measuring
device
to
an
output
line,
connect
an
electrolytic
capacitor
between
them
to
cut
the
direct
current.
Also,
the
positive
(+)
and
negative
(—)
terminals
of
the
left
and
right
channeis
must
be
connected
independently
with
respect
to
direct
current
and
alternating
current.
Be
particularly
careful
that
measuring
devices
connected
to
different
channels
and
placed
in
close
proximity
to
each
other
do
not
contact
each
other.
Output
terminals
of
set
Voltmeter
Oscilloscope
35 V 2200 ux2
+-—+
35 V 2200 px2 (Example of connection of external measuring devices)
Panasonic Tokyo Office
Matsushita Electric Trading Co., Ltd: Matsushita Electric Trading Co., Ltd.
B
P.O. Box 288, Central Osaka Japan 6th Floor, World Trade Center Bldg.,
i No. 4-1, Hamamatsu-cho 2-Chome, Minato-ku,
Tokyo 105, Japan
GAD
aM (MZ| Printed in Japan ®