Panasonic RX-CT900 Service 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

Panasonic RX-CT900 Specifications

General

Type	Stereo System
Tuner Bands	AM/FM
CD Player	Yes
Equalizer	5-band graphic equalizer
Weight	6.5 kg
Power Source	DC 12V (8 x D batteries)
Speakers	2
Tape Decks	2
Cassette Deck	Yes
Tuner	Digital tuner with presets

Summary

Product Specifications

General Specifications

Details power requirements, consumption, output, speaker, jacks, dimensions, and weight of the unit.

Radio Section Specifications

Covers frequency range, intermediate frequency, and sensitivity for radio reception.

Tape Deck Section Specifications

Details frequency response, recording system, tape speed, and track system for tape decks.

Control Panel Layout

General and Timer Controls

Identifies and describes general and timer-related controls on the unit.

Tuner and Memory Controls

Details controls related to radio tuning, band selection, and memory functions.

Cassette Deck Controls

Explains controls for the cassette tape decks, including playback and recording operations.

Disassembly and Component Replacement

Front Cabinet Removal

Step-by-step guide for safely removing the front cabinet of the unit.

Internal PCB and Mechanism Removal

Procedures for removing the cassette mechanism, graphic equalizer, and various PCBs.

Power Transistor Replacement

Detailed guide for replacing the power transistor, including necessary steps and precautions.

Schematic Diagrams

Operation Circuit Schematic

Detailed circuit diagram for the unit's operation and switch functions.

Main, Mechanism, and Power Circuits Schematic

Circuit diagrams covering main board, mechanism control, and power supply sections.

Graphic EQ, XBS, and Power Supply Circuits Schematic

Circuit diagrams for graphic equalizer, XBS amplifier, and power supply sections.

Circuit Board Wiring Diagrams

Operation Switch PCB Wiring

Illustrates wiring connections for the operation switch PCB.

Main PCB and Speaker Wiring

Shows wiring for the main PCB, including connections to speakers and other components.

Power Supply PCB Wiring

Depicts the wiring layout for the power supply PCB.

Component Identification and Guides

Terminal Guides (ICs, Transistors, Diodes)

Provides terminal assignments and functions for integrated circuits, transistors, and diodes.

Liquid Crystal Display (LCD)

Shows example display patterns for the liquid crystal display, including timer and stereo indicators.

Measurements and Adjustments

General Alignment Instructions

Provides essential guidelines and prerequisites before performing any alignment procedures.

Radio Frequency and IF Alignment

Details alignment steps for AM, MW, and FM radio frequency and intermediate frequency circuits.

Tape Deck Alignment Procedures

Covers alignment for playback gain, bias, record/playback level, tape speed, and head azimuth.