Panasonic RX-CT900 User manual

Service
Ma
RX-CT900
Ly .
Portable
Stereo
Component
System
RX-CT800
MECHANISM
SERIES
@ SPECIFICATIONS
General:
~
Power
Requirement:
AC;
(E)(EG)..........
220
V,
50
Hz
(EB)
osices
eee
240
V,
50
Hz
Battery;
15
V(10
UM-1
“R20/LR20”
Batteries)
DCIN;
13.2
V(12~15
V)
Memory
Back-up
Battery
for
Computer/
Clock;
6
V
:
(4
UM-3,
“AA”
size
batteries)
Power
Consumption:
45
W
(AC
only)
Power
Output:
60
W
(30
Wx2)...PMPO
30
W
(15
Wx2)...MPO
Speaker:
Woofer;
16
cm
PM
Dynamic
Speaker
(2.72)
Tweeter;
2
cm
Ceramic
Speaker
Jacks:
Input;
CD/AUX
IN;
316
mV,
50
kQ
EXT.
MIC;
2
mV
(200~6000)
Output;
EXT.
SP;
2.7~80
HEADPHONES;
320,
23.5
Dimensions:
700
(W)
218
(H)x
196
(D)
mm
Main
Unit;
349
(W)
x218
(H)x
196
(D)
mm
Speaker
Box;
185
(W)x218
(H)x
183
(D)
mm
Weight:
6.5
kg
without
batteries
Radio Section:
Frequency Range:
Intermediate
Frequency:
Sensitivity:
Tape Deck Section:
Frequency Range:
Tape Speed:
Track System:
Tape Deck Section:
Frequency
Response:
Recording System:
Tape Speed:
Track System:
Country
(E)
Continental
Europe
(EB)
(EG)
ORDER
NO.
MD8906025C2
i
Radio
Cassette
Color
(K)
........
Black
Type
Area
Great Britain
F.R. Germany/Italy
FM; 87.5~108 MHz
LW; 146~288 kHz
MW; 522~1611 kHz
FM; 10.7 MHz
AM; 459 kHz
FM;
2
4/50
mW
output
(—3 dB Limit Sens.)
LW;
178
uV/m/50
mw
output
MW;
178
UV/m/50
mW
output
TAPE 1
Normal; 40~12000 Hz
CrO2; 40~13000 Hz
4.8 cm/s
4-track
2-channel
stereo
playback
TAPE 2
Normal; 40~12000 Hz
CrOz; 40~13000 Hz
AC bias, AC erase
4.8 cm/s
4-track
2-channel
stereo
recording
and
playback
Design
and
specifications
are
subject
to
change
without
notice.
Panasonic,
Matsushita
Electric
Industrial
Co.,
Ltd.
Central
P.O.
Box
288,
Osaka
530-91,
Japan

RX-CT900
LOCATION OF CONTROLS
CY TIMER ON SLP
(Et TUT
(LIL Li
GENERAL/TIMER CONTROLS
@ Speakers [Tweeters] (2 cm)
@ Speakers [Woofers] (16 cm, 2.70)
© Mixing Microphone Jack (MIXING MIC)
(@3.5, 200~600Q)
© Headphones Jack (PHONES) (23.5, 32Q)
@ Operation Switch (OPERATION)
@ Operation/Battery Check Indicator
(OPR/BATT)
@ AC Connection Indicator
© Editing Selector/FM Mode Selector/Beat Proof
Switch (EDITING/FM MODE/B.P)
© Function Selector (SELECTOR)
@ Volume Control (VOLUME)
® XBS Switch (XBS)
® Graphic Equalizer (GRAPHIC EQUALIZER)
® Balance Control (BALANCE) _
@® Display Mode Selector (DISPLAY)
@® Time Set Buttons (TIME SET)
® Adjust Button (ADJUST)
@® On-Time Button (ON-TIME)
® Timer Button (TIMER)
® Sleep Button (SLEEP)
@ Clock/Timer Display
@® Timer Display Indicator (4)
Timer Indicator (TIMER)
© Timer On Indicator (TIMER ON)
© Sleep Indicator (SLP)
NS
MEMORY
———TIME SET
® SLEEP os i ADJUST 16
TUNER CONTROLS
@ Tuning Display
@® Band Indicators (FM1-FM2+LW-MW) )
FM Stereo Indicator (STEREO)
© Tuning Indicator ([TUNE])
© Memory Station Indicator
© Memory Indicator (M)
® Memory Station Buttons
@® Memory Button (MEMORY)
@® Tuning Buttons (TUNING)
@ Memory Scan Button (MEMORY SCAN)
@ Band Selector (FM1, FM2, LW, MW)
DECK CONTROLS
@ Tape Selectors (TAPE SELECTOR)
@ Deck 1 Cassette Compartment
ny
@® Deck 1 Tape Operation Buttons
Playback Button (> PLAY) aes
Rewind Button (<< REW) ,
Fast Forward Button (>> FF)
Stop/Eject Button (@/4 STOP/EJECT)
Pause Button (1 PAUSE)
@ Deck 2 Cassette Compartment
@ Deck 2 Tape Operation Buttons
Record Button (¢ [RECORD))
Playback Button (> PLAY) )
Rewind Button (<< REW) ee
Fast Forward Button (>> FF)
Stop/Eject Button (—/4STOP/EJECT)
Pause Button (I PAUSE)
@ ‘Dolby Noise Reduction Switch (DOLBY NR)

“Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol D0 are trademarks of
Dolby Laboratories Licensing Corporation.
i
ied S== ee
©) = Ot) oT
When the tape is caught in the pinch roller, etc. Release the tape by
tuming the pulley on the motor with the screwdriver in the direction of
the arrow.
)
;
ee
Removal
of
the
Front
Cabinet
[Removal
of Screws]
Use
a
screwdriver
similar
to
the
one
in
the
figure.
1
A)
5 he
BUSHING
| fa PHAIOOA
oes no
CO a f conn} :
| Co
ot - ;
Ss Ng L=150.mm or longer
9
= aol
: 1
er
16)
(7) elf you attach a bushing (part
Battery Cov number: RHR109A) to the tip of
the screwdriver as shown in the
figure, the screwdriver tip will
easily fit in the screw heads and
1. Remove the battery cover. - you will be able to remove the
2. Remove 7 screws (@~@). Screws with ase.
RX-CT900 _
STEREO
_ rer
thie
rt
MILI
wee
SLEEP TIMER ON-TIME ATUST
REAR PANEL
€ Speaker Cable Compartments
@ Speaker Wall Mounts
@ Speaker Release Levers (RELEASE)
@ Handle
& Telescopic Antenna
@ Speaker Cables
© CD/AUX Input Jacks (CD/AUX IN) (316 mV, 50 kQ)
@ Battery Compartment
@ DC Input Jack [DC IN 13.2 V (12-15 V)JO--@]
@ AC Socket (AC iN ~)
@® Speaker Terminals [SPEAKER (IMP 2.7—80)]
Volume Knob
G.E.Q Knobs
Balance Knobs
Stop/Eject Button
3. Pull out the volume knob, G.E.Q. knob and balance knob.
4. Press the stop/eject button and the open the cassette lid.

RX-CT900
(ee ee er a ee Rae Hemnows| of the Graphic Equalizer
Procedure | cs502 CP510 cps 4CP512 Procedure 0
1-2 = j 133 g 5
1. Remove 4 screws (@~Q). 1. Remove 3 screws (@~®).
2. Remove 4 connector (CP510, CP511, CP512, CS502). 2. Remove the connector (CP302).
Procedure
1-23-45 CP301
Procedure
1-4
1. Remove 2 screws (@, @).
2. Remove 2 connector (CP402, CS401). 1. Remove the connector (CP301).
\
Removal
of
the
Power
P.C.B.
_
MainP.cB.
|
.
Procedure 1)
saa
1. Remove the connector (CP301). Se / Record Lever
. Remove the record lever. ; eal
2. Remove the record lever.
. Remove 5 screws (@~@).
.
Release
the
claw
in
the
direction
of
arrow.
salient
ilar
Removal of the Battery P.C.B. Removal of the Mechanism Button
Procedure
Procedure
ca
152-37 1-8
: 1. Release the claw in the
direction of arrow.
2. Remove the battery P.C.B.
in the direction of arrow.
| —H
‘daa aaa
Remove 4 screws (@~@).

RX-CT900 RX-CT900
Ref. No. Removal of the Cassette Holder Ref. No. Removal of the Speaker’s Front
9 10 Cabinet
] 2)
Procedure
m@ HOW TO REPLACE THE POWER TRANSISTOR
Main P.C.B.
Procedure
10
Power Transistor
Nut
arrow.
Release 4 ribs in the direction of arrow.
Removal
of
the
Speaker
(Woofer)
Procedure
10-11
Note
If the nuts can not be easily removed while the screws are being
turned, push the screw heads with the Phillips screwdriver (see
figure) and keep them in this position, and then turn the nuts.
Solder
2. Remove the solders and then the Power Transistor in the
direction of the arrow.
Sound Absorbing Material
1. Remove the sound absorbing material. 2. Remove 4 screws (@~@).
Procedure
12
eRemove
Cassette Lid
Procedure
10-13
| aoe obthe Speaker Wall eee Removal of the Speaker (Tweeter)
jount
0
2 screws (@, @).
Detach the tweeter in the direction of arrow.
Note: The tweeter has been attached to the cabinet with
double-sided adhesive tape.
\
|
e@Assemble the front cabinet
| match mechanism button and
| mechanism lever.
|
1
!
/
3.
Apply
the
compound
grease
(SZZOL15)
to
the
sheet
and
Power
Transistor.
4.
Hold
the
screws
with
the
pliers
as
shown
in
the
figure
and
then
insert
them
in
the
holes
in
the
Power
Transistor,
sheet
and
heatsink
respectively.
Power Transistor
Nut
5. Attach the nuts and then secure the screws with the driver as shown in
the figure.
Pliers
Apply the compound
grease (SZZOL15) to this
surface.
Nut
. Turn the nuts in the direction of the arrow.

RX-CT900
RX-CT900
SCHEMATIC DIAGRAM (for operation circuit) (Parts list on page 22~28.)
Notes:
1. S1-1~S1-7: Record/Playback switch in “PLAYBACK” position. 35. VR1: FM VCO adjustment VR.
(P...PLAYBACK, R...RECORD) 36. VR101: Deck 1 playback gain adjustment VR (Lch).
AL
OPERATION
SWITCH
CIRCUIT
2.
S2-1~S2-3:
Function
select
switch
in
“TAPE”
position.
37.
VR102:
Deck
2
playback
gain
adjustment
VR
(Lch).
(T... TAPE, R... TUNER, A...[CD/AUX) 38. VR103: Record level adjustment VR (Lch).
3.
S3:
Editing/FM
mode/Beat
proof
switch.
39.
VR111:
Graphic
equalizer
control
(100
Hz)/XBS
level
control
Oe
oe
ee
ved
Sais
air
iwie
Sani
S3-1;
Editing
mode
switch
in
“MIC”
position
VR
(Lch).
ema
(Men
2
(Mem
6)
(Mem
51
(Adina
isteep)
(ner)
(Royer)
blay
ssid
:
(M...MIC,
N...NORMAL
SPEED,
40.
VR112:
Graphic
equalizer
control
VR
(330
Hz,
Leh).
ey
oye
Bela
1
H...HIGH
SPEED)
41.
VR113:
Graphic
equalizer
control
VR
(1
kHz,
Lch).
rye
Pagan]
so]
$3-2;
FM
mode/Beat
proof
switch
in
42.
VR114:
Graphic
equalizer
control
VR
(3.3
kHz,
Lch).
Men
As
{on
Time)
i
com
“STEREO/!’
position.
43.
VR115:
Graphic
equalizer
control
VR
(10
kHz,
Lch).
cal
at
al
ryoissidara
ian
(S/I...STEREO/I,
S/HE...STEREO/#1,
M/
44.
VR116:
Volume
control
VR
(Lch).
oa
i
ae
J
HEL...
MONO/HED
45.
VR201:
Deck
1
playback
gain
adjustment
VR
(Rch).
(disploy)
|
sMemory)
|
(M.scon
4
4.
S4:
Deck
1
tape
select
switch
in
“NORMAL”
position.
46.
VR202:
Deck
2
playback
gain
adjustment
VR
(Rech).
oy
oS
ial
avenge
sara
(N...NORMAL,
Cr...[METAL]/CrO2)
47.
VR203:
Record
level
adjustment
VR
(Reh).
,
a
‘
D410
5.
S5-1~S5-2:
Deck
2
tape
select
switch
in
“NORMAL”
position.
48.
VR211:
Graphic
equalizer
control
(100
Hz)/XBS
level
control
:
t
4
h
cae
OPERATION
(N...NORMAL,
Cr...
[METAL]/CrOz)
VR
(Reh).
ee
6.
S6:
Dolby
NR
switch
in
“OFF”
position.
49.
VR212:
Graphic
equalizer
control
VR
(330
Hz,
Reh).
Dat
fo
.
7.
S7-1,S7-2:
XBS
switch
in
“OFF”
position.
50.
VR213:
Graphic
equalizer
control
VR
(1
kHz,
Reh).
as
AC
CONNECTION
INO.
8.
S8:
Mic
switch.
51.
VR214:
Graphic
equalizer
control
VR
(3.3
kHz,
Rh).
Baeergn
“i
Sv
eyolssiaaTa
ae
:
9.
SO:
Deck
1
play
switch.
52.
VR215:
Graphic
equalizer
control
VR
(10
kHz,
Rh).
RESET
--
OV
avorsstssra
Te.
al
pags
i
cr4oz
10.
S10:
Deck
1
motor
switch.
53.
VR216:
Volume
control
VR
(Reh).
\
se
ae
Q
CD
stanay
i
14:
S11:
Deck
2
motor
switch.
54.
VR302:
Record
bias
(CrOz)
adjustment
VR.
[ea
eRe
as
Dicey
TO
romen
our
12.
$12:
AC/DC
select
switch
in
“AC”
position.
55.
VR303:
Record
bias
(Normal)
adjustment
VR.
1C402
Rr
be
4)
—
13.
S401:
Station
memory
switch
(8).
56.
VR304:
Balance
control
VR.
4
TT
@)
rato
14.
S402:
Station
memory
switch
(4).
57.
VR501:
Tape
speed
adjustment
VR.
s
PA
©)
earrery
15.
S403:
MW
switch.
58.
DC
voltage
measurements
are
taken
with
electronics
voltmeter.
2
agv
a8
ao-386
©)
~
se
Bhuain
16.
S404:
Station
memory
switch
(7).
The
negative
terminal
of
the
battery
provides
negative
meter
3
aos
VR
UP
|
cesaoe)
17.
S405:
Station
memory
switch
(3).
connection
point.
8
qaio
3308
OY
**
18.
S406:
LW
switch.
No
mark...PLAYBACK,[
]...RECORD,(
)...AM,<
>...-M
3s
TO)
V8
own
19.
$407:
Station
memory
switch
(6).
<
»...HIGH
SPEED
eae
20.
S408:
Station
memory
switch
(2).
59.
Battery
Currect:
Vol.min.............
200
mA
(Tape
Playback)
Ors
21.
$409:
FM2
switch.
Wolo
(aie
«hoes
as
haceiGipel
eee
hier
ces
1450
mA
(Radio)
one
22.
S410:
Station
memory
switch
(5).
1500
mA
(Tape
Playback)
23.
S411:
Station
memory
switch
(1).
Measurement
instruction
24.
$412:
FM1
switch.
Radio:
FM
60
dB,
30%
Mo)
25.
S413:
Adjust
switch.
Tape:
315
Hz,0dB
oe
i
26.
S414:
Tuning/Time
set
switch
(—).
60.
The
mark
(MM)
shows
test
point
e.g.
=test
point
1.
Fa
27.
S415:
Sleep
switch.
61.
Important
safety
notice.
Ge
28.
S416:
Tuning/Time
set
switch
(+).
Components
identified
by
A\
mark
have
special
characteristics
srenes
i
29.
S417:
Display
switch.
important
for
safety.
@isione
1,
ain
30.
S418:
Timer
switch.
When
repiacing
any
of
these
components,
use
oniy
manufacturer's
1c401 e —4) ctock CIRCUIT 31. $419: On-time switch. specified parts.
Gite sees 32. $420: Memory switch.
wuTe $3. S421: Operation switch.
GND : 34. $422: Memory scan switch.
h
\ ew stereo R406!
sue Bp IK
--0 v
®This schematic diagram may be modified at any time with the development of new technology.
cc: FM SIGNAL LINE mm): AM SIGNAL LINE E>: FM OSC SIGNAL LINE
E
| i
|
iStesoacors
Zp:
AMOSC
SIGNAL
LINE
sa:
PLAYBACK
SIGNAL
LINE
Sangriy
eer
ee
singe
con
i:
MIC
SIGNAL
LINE
10:
RECORD
SIGNAL
LINE
>:
MAIN
SIGNAL
LINE
expe:
+B
LINE
F
L040! (LDBU93974AZ)

RX-CT900 RX-CT900
SCHEMATIC DIAGRAM (for Main/Mechanism/LED/Graphic E.Q./Batter/ Power Supply Circuit (Parts list on page 22~28.)
1 2 3 4 5 6 7 8
EE} main circuit
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AN7205
RSI
08,9
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END
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WW.
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FM/AM
IF
AMP,
DET,AF
AMP
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RX-CT900 RX-CT900
MEASUREMENTS AND ADJUSTMENTS
@ ALIGNMENT INSTRUCTIONS
READ CAREFULLY BEFORE ATTEMPTING ALIGNMENT
5. Set power source voltage to 15 V DC.
6. Set G.E.Q. control to center.
7. Output of signal generator should be no higher
than necessary to obtain an output reading.
. Set volume control to maximum.
. Set FM mode selector switch to FM ST.
. Set band switch to AM/FM/LW.
. Set function selector to TUNER or TAPE.
koh =
@ AN-IF ALIGNMENT
SIGNAL GENERATOR or INDICATOR
SWEEP GENERATOR RADIO DIAL (ELECTRONIC
—|
“seTTING
VOLTMETERor
|
(Noter
to
ala
REMARKS
CONNECTIONS
FREQUENCY
OSCILLOSCOPE)
9.
9
Headphones Jack
Fashion a loop of : Point of non- (32Q)
several turns of wire ene interference Fabricate the pl
a i abricate the plug as . 3
and
radiate
a
signal
into
30%
Mod.
(on/about
shown
in
Fig.
1.
and
then
T3
(AM
IFT)
Adjust
for
maximum
output.
;
at
400
Hz
connect
the
lead
wires
of
the loop ant. of receiver. 600 kHz the plug to the measuring
instrument.
m@ MW-RF ALIGNMENT
m@ FM-RF ALIGNMENT
ADJUSTMENT
(Refer to Fig. 5.)
REMARKS
3.041.0V
7.041.0V
L3 (FM ANT
* Coil)
SIGNAL GENERATOR or INDICATOR
SWEEP GENERATOR RADIO DIAL (ELECTRONIC
SETTING VOLTMETER or
CONNECTIONS
FREQUENCY
OSCILLOSCOPE)
te to test point
aiag through FM : Macys...(+)
dummy
antenna.
87.50
MHz
Tune
to
signal
ry
(-)
Negative side to test
point fied.
Headphones Jack
(32Q)
u 90.00 MHz Seine, ee
connect the lead wires of
the plug to the measuring
instrument.
; hues ie i
(*2)
Four
output
responses
will
be
present;
proper
tuning
is
the
center
frequency.
m@ SEPARATION ALIGNMENT
EQUIPMENT
FM SIGNAL GENERTOR
SOURCE CONNECTION
CONNECTION
ELECTRONIC
COUNTER
(*1) Fix antenna coil with wax after completing alignment.
98 MHz, 60 dB (CW) Connect to
test point [GXI through FM
dummy antenna.
Negative side to fy.
m@ LW-RF ALIGNMENT
ADJUSTMENT
(Refer to Fig. 5.)
CT1 (FM ANT
Trimmer)
SPECIFICATION
(*2) Adjust for maximum
output.
REMARKS
Fashion
a
loop
of
:
several
turns
of
wire
520
kHz
Tuning
capacitor
er
...(+)
L6
(MW
OSC
Adjust
L6,
for
1.2+0.3
V
and
radiate
a
signal
into
fully
closed.
a4
...(—)
Coil)
reading
on
DC
voltmeter.
the
loop
ant.
of
receiver.
"
4.710
kHz
Tuning
capacitor
i
CT5
(MW
OSC
Adjust
CT5,
for
9+0.3
V
,
fully
open.
Trimmer)
reading
on
DC
voltmeter.
Headphones
Jack
(32Q)
.
F
;
A
Adjust
for
maximum
output.
”
.
f
1
oS
. . A
600
kHz
Tune
to
signal
coke.
anche
ean
TANT
Adjust
L9-1
by
moving
coil
along
connect
the
lead wires
of
the
ferrite
core.
the
plug
to
the
measuring
instrument.
"
" ;
CT2
(MW
ANT
.
‘
1,400
kHz
Trimmer)
Adjust
for
maximum
output.
@ FN-IF ALIGNMENT
SIGNAL GENERATOR or
SWEEP GENERATOR
CONNECTIONS FREQUENCY
Connect to test point
EE-ZEM through ceramic
capacitor (0.001 JF).
Negative side to test
point iG.
10.7 MHz
(SWEEP)
RADIO DIAL
SETTING ©
Point of
interference
(on/about
90 MHz)
m@ FM DC BALANCE ALIGNMENT
FM SIGNAL GENERTOR
SOURCE CONNECTION
98 MHz, 60 dB (CW) Connect to
test point GX] through FM
dummy antenna.
Negative side to fiigd.
EQUIPMENT
INDICATOR
(ELECTRONIC
VOLTMETER or
OSCILLOSCOPE)
Connect vert. amp.
scope to test point
Biixa- Negative side
to test point GK.
T1 (FM 1st)
T2 (FM 2nd)
ADJUSTMENT
(Refer to Fig. 5.)
CONNECTION
ELECTRONIC
COUNTER
Enzd..(-+)
fad -..(-)
ADJUSTMENT
(Refer to Fig. 5.)
SPECIFICATION
0+30 mV
=17=
REMARKS
Adjust for maximum
amplitude. (Refer to Fig. 2.)
Adjust for maximum
amplitude. (Refer to Fig. 3.)
REMARKS.
Adjust T2, for 0+30 mV reading on.DC
voltmeter.
Connect to test point
Eisi through FM
dummy antenna.
Negative side to test
point fia.
"
288 KHz
Tune to signal
146 kHz
162 kHz
270 kHz
@ HEAD AZIMUTH ALIGNMENT
TEST TAPE
QZZCFM
(8 kHz, —20 dB)
EQUIPMENT CONNECTION
ELECTRONIC COUNTER
Headphones Jack (320)
Fabricate the plug as shown in Fig. 1.
and then connect the lead wires of the
plug to the measuring instrument.
INDICATOR
Adjust VR1, for 19 kHz +50 Hz reading
on frequency counter.
Headphones Jack
(32Q)
Fabricate the plug as
shown in Fig. 1. and then
connect the lead wires of
the piug to the measuring
instrument.
”
q
bo
(*3) Four output responses will be present; proper tuning is the center frequency.
ADJUSTMENT
L7
(LW OSC Coil)
L9-2 (LW ANT
Coil)
CT3 (LW ANT ”
Trimmer)
SIGNAL GENERATOR or
SWEEP
GENERATOR
RADIO
DIAL
(ELECTRONIC
:
SETTING
VOLTMETER
or
|
(Heterte
hig
5)
REMARKS
CONNECTIONS
FREQUENCY
OSCILLOSCOPE)
oy
' 8.0 V+0.5 V
(*3) Adjust for maximum
output.
1. Test equipment connection is shown in Fig. 7.
Azimuth screw
(Shown in Fig. 4)
~18—
2.
Playback
the
azimuth
adjusted
part
(8
kHz,
—-20
dB)
of
the
test
tape
(QZZCFM)
and
regulate
the.
angle
adjusting
screw
so
that
the
outputs
of
L-CH
and
R-CH
are
maximized.
(When
the
adjusting
positions
are
different
with
L-CH
and
R-CH,
find
a
position
where
the
outputs
of
L-CH
and
R-CH
are
balanced,
and
then
make
the
adjustment.)
3.
At
the
same
time,
draw
a
lissajous
waveform
and
eliminate
phase
deflection.
(Shown
in
Fig.
7.)
. After the adjustment, apply screw-lock to the angle
adjusting value.

RX-CT900
Ml PLAYBACK GAIN ALIGNMENT
EQUIPMENT
TEST TAPE
CONNECTION
ELECTRONIC
COUNTER
ADJUSTMENT
(Refer to Fig. 6.)
REMARKS
DECK 1 (Lch)...VR101
: iy
QZZCFM
TP13
ee
(Reh)...VR201
1.
Playback
mode.
(315 Hz, 0 dB) DECK 2 (Lch)...VR102
(Reh)... VR202
2. Adjust VR, for —11 dBV +0.5 dBV.
BGEEY..Rch
li BIAS OSCILLATION ALIGNMENT
EQUIPMENT
TEST
POSITION
CONNECTION
ADJUSTMENT
REMARKS
ELECTRONIC (Refer to Fig. 6.)
COUNTER
A)
...(-+)
1.
Record
mode.
liak...(-)
me
2.
Adjust
VR302,
for
AC
21
V+0.5
V.
N
|
‘i
1.
Record
mode.
ome
2.
Adjust
VR303,
for
AC
13
V+0.5
V.
m@ RECORD/PLAYBACK LEVEL ALIGNMENT
EQUIPMENT
TEST
TAPE
Ce
Fecuic
ADJUSTMENT
REMARKS
eOUNTER (Refer to Fig. 6.)
1. Insert test tape QZZCSZ in DECK 1 anda
blank tape.in DECK 2.
2. Set the unit to the dubbing mode at normal
* speed.
3.
Adjust
VR103
and
VR203
until
the
difference
between
the
playback
level
for
DECK
1
and
the
recording
level
for
DECK
2
is
within
1
dB.
QZZCFM
- (315 Hz, 0 dB)
Leh... VR103
Reh...VR203
. Short-circuit [GX with solder.
. Inserttest tape QZZCSZ in DECK 1 anda
blank tape in DECK 2.
3. Set the unit to the dubbing mode at normal
speed.
4. Adjust VR103 and VR203, for AC
17 mV +0.5 mV.
@ TAPE SPEED ADJUSTMENT
EQUIPMENT CONNECTION
ELECTRONIC
COUNTER
RADIUS
MENT
peMani
Headphones
Jack
(32Q)
Normal
Speed
Adjustment
(
Fabricate
the
plug
as
shown
in
Fig.
1.
1.
Insert
a
test
tape
(QZZCWAT)
in
Deck
1
and
play
it
back.
and
then
connect
the
lead
wires
of
the
i.
.
plug
to
the
measuring
instrument.
2.
aoe
ne
until
the
measured
value
becomes
3.
Check
Deck
2
in
the
same
way
to
make
sure
it
satisfies
the
specification.
Deck
2...-+50
Hz
of the
speed
of
Deck
1.
If it doesn’t repeat steps 1_and 2 above.
Note:
This
set
uses
one
drive
motor,
so
be
sure
to
perform
the
adjustment
in
Deck
1.
High
Speed
Measurement
4.
Insert
the
playback
tape
into
Deck
1
and
the
editing
tape
into
Deck
2.
5.
Set
the
Editing
Mode
Selector
to
the
“HIGH”
position.
6.
Press
the
Deck
2
Pause
button,
then
press
the
Record
Button.
7.
Press
the
Deck
1
Playback
Button.
_ Editing is started by means of the Synchro-Start function.
8.
Check
be
sure
that
the
measured
speed
is
at
least
1.63
times
faster
than
normal
speed.
m@ ALIGNMENT POINT
Please refer to Circuit Board and Wiring Connection Diagram for test point locations.
— ep
—* To Measuring
—e Instrument
7 R=320
oa : Fig. 2 Fig. 3
TEST TAPE
VR501
(Shown in Fig..9.)
QZZCWAT
(3 kHz)
To Headphones
Fig. 1
~19-
RX-CT900
FM ANT FM ANT MWANT
SOMHz IOGMHz 600kHz 459kHz
AM IFT
MW ANT
1400kHz
[es] [et] [Le-r] [73 |
cT2
FM VCO FM 2nd FM
I19kHz+50Hz 1O.7MHz 10.7MHz
Ist Mw OSC
520k Hz
LWANT
27 OkHz
MW OSC
I7IOkHz
De} Cre] [ee] [ee]. [ers]
Fig.
5
Electronic
Headphones jack volt meter
Ss |
Playback “=e =
mode Electronic
volt meter
Fig. 7
Oscilloscope
MECHANISM CONTROL P.C.B.
Tape Speed
ay
Fig. 9
Recore
(Erde)
Record
pecerd pecord
ae
:
Beck
2
‘
Becks
é
pce
ias
eve
eve
aybac!
b
(Norma)
‘TEch)
‘TRem
—GorkeeGy
GarwresK)
Slayers,
Blavback
[vR302]
[vR303] [vrio3} [vr2os)_—[vrio!
FUNCTION OF IC TERMINALS
IC401
(UPD75306G073):
MICROCOMPUTER
Rec bias
oscillator
Keep these cords short.
©In
order
not
to
influence
the
bias
oscillation,
divide
the
voltage
with
1
MQ
and
1
kQ
resistors,
and
measure
the
voltage
across
the
1
kQ
resistor.
Fig. 8
BASIC
INTERVAL
TIMER
INTBT
110 /P13—e| TIMER/EVEN
Ptoo/rad~—| COUNTER KY
INTTO
ae [at KS
INTW LCD
ERIAL
S1/SBI/PLUD CLOCKED
$0/$B0/PC2 + $ =
SEK /P01 =—e} INTERFACE
INTCSt
into P10 }
INTI/PLIO—
intope I] interrupt
; t 7] CONTROL
INTa EOD ——
KRO/
-KR7/P73 9
BIT SEQ. ae),
BUFFERUG6)
PROGRAM
COUNTER (13)
PROGRAM
MEMORY
(ROM)
6016x 8BITS
sie
OECODE
ANO
CONTROL
ean ‘ae ports Ka) P30- P33
DATA
MEMORY
(RAM)
512x 4BITS [ 24), $0~ $23
4 / BPO
ico fe» %
ixt24
PLC /P22
SYSTEM CLOCK
Stee | CLOCK [GENERATOR | STAND BY
CONTROL] O'VIDERT sug [main | CONTROL
OOOO
XTl XT2 XI X2
cpu
CLOCK
Voo VSS RESET
| Port 2] PIO-PI3
PORT2 K @ ) P20- P23 pibveha
P63/KR3
P62/KR2
P6I/KRI
P6O/KRO
x2
iis porto Ka] POO - POS
=,
=,
P3i/SYNC
P3O/LCDCL
P23 /BUZ
~$31/8P7
PLI/INTI
P10/INTO
P03/S1/S81
“LLER :
aaves [4 como-coms
K 3] Veco - Vec2
© BIAS
© LCDCL/P30
© SYNC / P31
Lco—-|
~20-

aed
KP
Terminal
Number Port Assigment vO
1~20 $12~$31
21~24 COM 0~COM3
BIAS
VLC @~ VLC 2
P40
P44
P42
Nh
a
VR.UP
VR DOWN
FM
wo oS
3
pe)
mp] a
P43
3 VSS
34 P50
wo
Q m
35 Ct P51 | SIGNAL
36 P52
P53
¥i
N
38 POO
39 PO1
[somes [emt fo |——
Cs
[ro fo lw
ro. | rowen our
51 P31
RESET
69~71 S0~S2
$3~S11
_ RX-CT900 |
ee
Output the LCD drive signal.
Output the common signal.
Outputs the motor rotation control signal for the motor operated volume.
Outputs the FM/AM switch signal (AM: HIGH, FM: LOW).
Outputs the data transfer control to the PLLC (can be transferred at HIGH).
GND
Inputs the stereo display signal (displays “STEREO” on the LCD at LOW).
Displays “TUNE” and inputs the auto stop detection signal (Displays “TUNE” and
auto stop function at LOW).
inputs the AC power supply detection signal (assuming that AC power supply is turned
ON at HIGH).
Operation selector switch; inputs the “RADIO” detection signal.
Inputs the main power supply detection signal (prevents the power from being turned
ON at LOW).
Key matrix signal source. : =
Outputs the audio mute signal.
Outputs the main power supply control signal (turns the power ON at HIGH).
Outputs the remote controlled power supply control signal (performs the operation of
the light reception section at HIGH).
Outputs the LED contro! signal for checking the operation of the motor operated
volume.
+B
Crystal connection terminal for the oscillation of the subsystem clock.
Crystal connection terminal for the oscillation of the main system clock.
P60~P63, ae
60~67 P70~P73 fof —. | Input the key matrix signal.
Input the system reset signal. ;
Outputs the LCD drive signal.
=

RX-CT900
Notes : * 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.
* The parenthesized indications in the Remarks columns specify the areas. (Refer to the cover page for area.)
Parts without these indications can be used for all areas.
* (M Indicates in Remarks columns parts that are supplied by MESA.
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1. C, SWITCHING
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_* RX-CT900
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aa
Ea,
ee
i
ee
a
ee
|
FN
5000
|
it
pe
se
09
ies
fiweté
————idT
Cd
Em
a
|
cc
fe
ee
a
aie
ee
a
ae
RX-CT900
—~24-

RX-CT900
RX-CT900
Notes : * Capacity valuse are in microfarads (uF) unless specified otherwise, P=Pico-farads (pF) F=Farads (F)
* Resistance values are in ohms, unless specified otherwise, 1K=1,000(OHM) , 1M=1, 000k(OHM)
[| me [ove |
ee ani (esa | Tia
a SN 5 a
Fea Sd eer ES |
a_i [aR ass emsenizar ene ———_—d
Re ERDS2TU222T | 1/4R 2.2K Reg RDS2TJ02T | 1/4" 1K Ris? fERDS2TJ472T | 1/W 47K
vi 7K Vk ii fsa fave ak
rt —_fesenarar [aA atk acs [aosensnen [are aed
rs ——sTeRDS2TJ333T | 1/4W 33K R72 ERDS2TJ822T Rizo. eRDS2Ts471T | 1/48 470
md a eee ae !
MEE
RL 10 R181 ERDS2TSISIT | 1/48 150
r=]
m2
ma
R21 ERDS2TJ104T
ERDS2TJ104T
fas lemsennoat [aw 10m
rea fstror [anak
as —_eoser arr
ERDS2TJ103T
ERDS2TJ103T | 1/4® 10K
193 ERDS2TJ3327
r
ERDS2TU473T | 1/4 47K
ana emosersoor_ [va 0
204 ERDS2TJ153T | 1/4¥ = 15K
i D
D
a
oe emsrtoor [ver sx |
7K
7
a
20
0
0
yy
Le
i—J wo
i bh
~z
fr27——sJERDS2T470T | 1/4¥ 47 R103 ERDS2TJ100T | 1/4¥ 10 Jn210——|ERDS2TJ821T | 1/4¥ 820
R28 ERDS2TJ104T | 1/4H 100K R104 ERDS2TJIS3T | 1/4¥ 15K R211 fERDS2TJ332T | 1/4¥ 3.3K
R29 ERos2Ty470T | 1/4e@ 47 RLLO EROS2TUB21T | 1/4¥ 820 R22 ERDSZTJ1O4T | 1/48 100K |
R30 |ERDS2TJ470T | 1/4 47 fit ERDS21U332T | 1/4¥ 3.3K fRoi3.——sERDS2TJ330T | 1/48 33 uF
R32 ——sERDS2TJ104T | 1/4 100K R112 ERDS2TJ104T | 1/4¥ 100K R215 BRDS2TJ222T | 1/4¥ 2. 2K
R33 ERDS2TJIO4T | 1/4" 100K R13 ERDS2TJ390T | 1/4¥ 33 ERDS2TI472T | 1/4H 4. 7K
R35 ERDS2TJ473T | 1/4W 47K 115 ERDS2TJ222T | 1/48 2 2K zig |ERDS21J222T | 1/4R 2.2K
R36 BRDS2T473T | 1/48 47K R17 ERDS2T472T | 1/48 4. 7K R220 | ERDS2TJ103T
aw ax
ee ee
poo [esosioat inhi eorex
plese asennad
o_o esa osersost [ee wid
me [emsevion [aw ok __—‘iice an fost [iad
eases i
si ___ [users
as
ee a
et emsersomt [awk
IK
22K
K
IM
0
R136 ERDS2TJ680T | 1/49 68
R137 ERDS2TJ223T | 1/48 22K
K
IK
7K
6K
4
ERDS2TJ473T | 1/4W# 4
a
2
R132 ERDS2TJO3T | 1/4# 10
7
R237
2 fRe3g_|ERDS2TJ102T | 1/4H
0
1
1
134 ERDS2TJ471T | 1/48 4
1
4
OK
2K
OK
M
70
68
fRo37_——sERDS2TU223T | 1/48 22K
R238. [ERDS2TJ103T | 1/4W 10K
1K
7K
2k
56K
OK
iss —_‘feosiseet [aan 0k |
a ake sosenue |
ise —_‘feweorrat [iw atk rest_init |
s___easesiot mt [enosenczar ast fewer [area
an —_feasernest [aw ten | as ass [sete :
siemens [arn ox_—| reson [ia Soe
‘ease avo esos ea
rea demscrsaret [tak
a ___[esrtoat ase [eos eae
—-25-
R264
e264 = |ERDS2TJIOST | 1/4H = 10K ERDS2TJ1O3T | 1/4" 10K RCBSLCLOSMYY
Rees ERDS2TJ229T | 1/4 22K Ra44——[ERDS2TJ103T | 1/4" 10K ECKVIHLOSMD | SOV 0. 01U
ress = [eRoSzTy22at | 1/48 220K R345 ERDS2TI332T | 1/4¥ 3.3K RCBSLHLO2KBY | SOV 0. O02U
e267‘ ERDS2TU472T R346“ [ERDS2TJ106T | 1/4 10M c13, «| RCBSLCLOSMYY | 16V_ 0. O1U
R268 EnDS2Tu472t | 1/4 4.7K {|R347 ERDS2TN103T | 1/4" — 10K ca ecovnntosyz3 | Sov WU
ERDS2TJO3T | 1/4 10K R348 ERDS2TJ151T | 1/4¥ 150 ECKVIHLO2KB | 50V 0.0010
R270 [ERDS2TU47IT | 1/4R 470 R349 [Ros2ty473T | 1/4W 47K ROBSLHBR2KCY | 50V 8.2P
R272 ERDS2TJ222T | 1/4¥ 2.2K R350 |ERDS2TJ473T | 1/4 47K RCBSIHLOZKBY | SOV 0. 0010
fe273_——[eRDSargtoat | 1/4" 100K R351 ERDS2TJ473T | 1/48 47K ROBSHZ20JCY | SOV 2aP
e280 —ERDS2TU2R2T | 1/4W 2.2 R352 [ERDS2TY222T | 1/4W 2.2K c2s | RCBSLHLOaKBY | SOV 0. 001
resi s[eRosaTuisiT | 1/4® 150 R353 ——«(ERDS2TJ473T | 1/4" 47K RCBSIHAR7KCY | SOV 4. 7P
ress leRDs2tu22aT | 1/4W 22K R357 ERDS21J223T- | 1/4W 22K c27 | RCBSLHLOZKBY | SOV 0.00
R291 ERDS2TJIS3T | 1/4W 15K R358 ERDS2TU271T | 1/4# 270 RCBSLHLO2KBY | SOV 0. 001U
pag2 Ss feRDS2Ty103T | 1/4¥# 10K |{R359 ERDS2TJ1O1T | 1/4¥ 100 czas RCBSLH220Jcy | SOV 22P
R283 BRDS2TI3320. | 1/4H 3.3K [R360 | ERDS21J821T exo = ]ReBsiHLOOJcY | Sov 10P
Rosa‘ (ERDS2TJ222T | 1/4W 2.2K R361 BRDS2TJ1O2T | 1/4 1K RCBSLHLO2KBY | SOV 0. OO1U
{rs00—sferosztJseat [1/4¥ 56K R363 ERDS2TUA72T | 1/48 4.7K xz |RCBSLIAR7KCY | SOV 4.7P
R301 ERDS2TJIROT | 1/4H# 1 R364 ERDS27J223T | 1/48 22K c34 «| RCBSLHLOZKBY | SOV 0. OO1U
rs02——‘eRDS2Tua72T | 1/4W 4.7K R365 ERDS2T472T | 1/48 4.7K ECCviHLooKe | SOV 10P
R303 ERDS2TJ472T | 1/4W 4.7K R367 ERDS2TJ473T | 1/48 47K ca. REBSLH330JLY | SOV 39P
os feosernos [ni
aos fewer [van aah
aoe fensernost [a
|
ao
fecsicioany
[ie
actd
8 ss asioenaty | Sova?
oui___[eiserser axe emseniout [iran sao |e
ata [roseruiat oan feoriceznor | av owas
4.7 R404 662 ROBSICIOSMYY | 16V_ 0. 01U
acs femsencer [ayer ik _——(|ows__eumicezmoy| tov oom |
cn —_‘[arnicznar [sav 0.020
po? ease i
om
pat femsencor [ira ak___|f [orice | 1 00a
ama —emsriseer_ [ven —_—| iv 0
R325‘ ERDS2TJ104T R505 | ERDS2TJL02T. C71 ECEALEUSRIB | 25V 3.30
rans eset | anak om
sia [erases cis __|exrniozzwoy
es —_—femsercost [ie sx] | ii 167.00
roca ——_famecrscaot [in sk iit SSCiis |
sno [esr ee |
7 ivi
rane femsensrat [aan ark [ce __[asuuoar [sav oon —___—_|fors___anemzan
R333‘ ERDS2TJ221T cs «| RCBSLHIO2KBY | SOV 0. 0O1U c79 ECEAIHJ2R2B | SOV 2.2
oa [sera ca eownwraa | S07 0.4 naan | aa ow
R335 {ERDS2TJ472T c5———|RCBSLHLO2KBY | SOV 0. 001U cal ECEALWURA7B | SOV 0.40
eae eosennost [ivan tox —_—| 507 _ 180 cee aoe
ies? enor [ivan amk [ov ___posenoy [sav 150 cet froonemios [aww
R338 |ERDS2TJ103T cs. RCBSicioMYY cea BCQP2A102NZT | 100V 0. OO1U
16V_ 0.010
~26-

RX-CT900
cas casio [iv on coe arose
cos exon
oi [erricazwy [ia 0.02 ci
ci
16V 0.047U C182 ECEALCU222E c281——{ECEALEUI01B | 25V 1000
ot ea —_|eneaue
iv iv
56
cata case
eu feeanovzus ia zzop = __{fcas_[reatonio ca
ui _eceatuioo8 [1600 cia
cons__aerca
€127 RCBS1C472MXY | 160. 0047U
OV 1U
50V 1U
m2
223 5OV 0. 0010
224 SOV 0.220
RCBSLHLO2KBY | SOV 0. 0O1U
6227 16¥0. 0047U
rz
a
28
8
C237 sv WwW
28
C245 ECEALHJO10B
cs
c247 RCBS1H471KBY
28
a0
a2
C313 16V 0.0220
C315 RCBSICLOSMYY
C318 ECEAICU100B
sv WU
vu
oa Rr)
a
C
corr eno [ea Ww
C319 ECFT1C223MDY | 16V 0.022U
C320 ECEALAU330B
10V. 330
321 ECEAIHU221B 10V. 220U
C322 ECEALAU70B
en
ECFT1C473MDY
st
328 ECEAQJU470B
329 ECEAQJUI01B
330 CEA1AU221B 10V 220U
0331 ECEA1AU101B tov 100U
cab__—_eceanamion [Sova
C147 RCBS1H471KBY
as
11
0325
HH
o> oO QQ
J S&S cor)
L
Q
ECEALCU100B 16V 10
RCBSLHLOZKBY | SOV 0. 001U
0344.
347
C161 ECEALHUR33B SOV 0. 330
RCBSIC152MKY | 16¥0. 0015U
cass —froetnmeas|sov zat
ECFTIC333MDY | 16V 0. 0330
ola capa}, al] a rr OE:
Ps = im | eo co o o| co
18 cst [rosin 2
oss ca 10a
18 ss __ecrticoaw | aaa ‘fossa __[aceaanins
C160 ECFT1C333MDY 258s |ECEALMUOIOE | S0V WwW C341 ECEALEU470B | 25V 470
Za
coo |
C162
-27-

RX-CT900
a ee a
fe 2 we ee a
oo foeawns | aov aw _—+i|___|_|.——sdi| i
ee a ee ee a
oe foeatznos [av iow | __{ | SSS
eT aes Say ane eaeeee
Se ae eee
essen le se
Pe ey
Per eee aes eT
a ee
eae Ne ee
po ee Ip
nee ee I ee et ll
Ea Co a ee ee
ee es od
pe i ee
-
(ca
aster
Jaa
oon
pe
ee
ace a Mae eT
ee es ee ee
ea |S eee
[ee
QoQ
SOV 0. O01U
feaoa___pcasunzrosty | Sov 27P
SOV _ 3a
C416 RCBS1H331KBY
ez franzaase [ov azo
fe eral [ee es 2
Hema
eae
a
Q
Qa
Da
2D
2
a
— 28—