Panasonic SG-40 User Manual

ORDER NO. TSD81070013¢C
Service
Manual
FM/AM/FM STEREO WITH
CASSETTE TAPE DECK
DO eaarssrew)
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*’'Dolby” and the double-D symbol are trademarks of Dotby Laboratories Licensing Corporation.
“Noise Reduction System manufactured under license from Dolby Laboratories Licensing Corporation.
SPECIFICATIONS
AMPLIFIER SECTION
Power Output:
MPO ............. 35Wx 2 (THD 1%, 42)
BMSi suze Pages acer a tea aed 4 27W x 2 (THD 1%, 42)
25W x 2 (THD 0.8%, 42)
One channel driven
RMS ............. 22Wx 2(THD 1%, 4Q)
20W x 2 (THD 0.8%, 42)
Both channel driven
Frequency Response... .. 30Hz~40 kHz, +1.5 dB (DIN)
Power Band Width ...... 25 Hz ~ 25 kHz, -3 dB (DIN) (THD
0.9%, 42)
Input Sensitivity & Impedance:
WIG boc alo eS 1 mV, 3k2
PIR eS eae eee 150 mV, 47kQ
PHONO! 2.5 oe ae a ee 2.5 mV, 47kQ2
Rec Out & Impedance... . 150 mV, 2.2k2
Tone Controls:
BaS$i5 i050 354 a nbd +10 dB at 50 Hz
Treble. 2... 2. .00.. +10 dB at 15 kHz
Loudness Control ...... +10 dB at 50 Hz (Volume at -30 dB
position)
FM TUNER SECTION
TuningSystem ........ Varactor Diode
(6 pre-selectors and 1 manual tuning)
Frequency Range. ...... 87.5 MHz ~ 108 MHz
Intermediate Frequency (IF) . 10.7 MHz
Sensitivity... ...0000. 2.0uV (S/N 26 dB mod. 40 kHz) (DIN)
at 762
2.0nV (IHF) at 752
Image Ratio. .....002.. 50 dB (98 MHz)
Signal/Noise Ratio ...... 63 dB (at 1 kHz, 60 dB, 40 kHz)
Distortion:
MONO............ 0.16% (at 1 kHz, 60 dB, 40 kHz)
STEREO .......... 0.22% (at 1 kHz, 60 dB, 40 kHz)
Stereo Separation ...... 40 dB (at 1 kHz, 60 dB, 40 kHz)
35 dB (at 250 Hz ~ 6.3 kHz, 60 dB,
AO kHz) (DIN)
33 dB (at 6.3 kHz ~ 10 kHz, 60 dB,
40 kHz) (DIN)
Selectivity. 2 0.0... 000. 70 dB (at 1 kHz, 60 dB, 40 kHz)
Panasonic
Stereo Music Centre
SG-40
“Hi
Covet
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Reese
—
Panssonic
AM TUNER SECTION
Frequency Range... .... MW; 525 kHz ~ 1605 kHz
(571m ~ 187m)
LW; 150 kHz ~350 kHz
(2000m ~ 875m)
Intermediate Frequency (IF) . 455 kHz
Sensitivity. .......... MW; 110uV/m (1 MHz)
LW; 250uV/m (240 kHz)
Image Ratio... 2... 0... MW; 50 dB (1 MHz)
LW; 35 dB (240 kHz)
TAPE DECK SECTIO
Deck System ......... Full Auto Shut Off Cassette System
Track System ......... 4-Track, 2-Channel
Recording System ...... AC Bias (50 kHz) with Dolby NR System
ErasingSystem ........ AC Erase (50 kHz)
TapeSpeed .......... 4.75 cm/sec. (1-7/8 i.p.s.)
Frequency Response. .... 20 Hz ~ 15 kHz (Normal)
20 Hz ~ 16 kHz (CrO2)
20 Hz ~ 17 kHz (Metal)
Signal/Noise Ratio:
DOLBY NR-OUT ..... 53 dB (Normal)
55 dB (CrO2) ron
55 dB (Metal)
DOLBY NR-IN..... .. 61 dB (Normal)) (10 dB or more
63 dB (CrO2) }improved at
63 dB (Metal) /5 kHz) (DIN)
Erase Ratio .......... 70 dB (DIN)
Channel Separation ..... 40 dB (DIN)
CrossTalk... ........ 60 dB (DIN)
Wow & Flutter 2... 2.0... 0.05% (WRMS), 0.15% (DIN-WTD)
POWER CONSUMPTION .. 160 W
POWER SUPPLY....... AC 220 V, 50/60 Hz
DIMENSIONS (WxHxD) . 430x 124 x 318 mm
WEIGHT ........... 7.2 kg
* Specifications are subject to change without notice for further
improvement.
Matsushita Electric Trading Co., Ltd.
P. O. Box 288, Central Osaka, Japan

Panasonic SG-40 Specifications

General

Type	Stereo System
Power Output	12 W per channel (min RMS)
Dimensions	450 x 150 x 370 mm
Weight	9 kg
Input Sensitivity	150mV

Summary

Specifications

Amplifier Section

Details electrical specifications for the amplifier section.

FM Tuner Section

Lists technical specifications for the FM tuner.

AM Tuner Section

Details the specifications for the AM tuner.

Tape Deck Section

Provides technical specifications for the cassette tape deck.

Location of Controls

Control Panel Overview

Identifies and labels the various controls on the front panel.

Disassembly Instructions

Component Removal Steps

Step-by-step guide for disassembling the unit and its components.

Cassette Tape Deck Alignment

Bias Alignment Procedures

Steps for aligning the tape deck's bias settings.

Azimuth, Dolby, and Rec Current Alignment

Procedures for aligning azimuth, Dolby, and recording current.

Alignment Test Points

Identifies specific test points for cassette tape deck alignment.

Dial Cord Stringing Guide

Dial Cord Routing

Instructions and diagram for routing the dial cord.

Radio Alignment Points

Radio Alignment Test Points

Identifies test points for radio alignment procedures.

Radio Alignment Procedures

AM-IF and RF Alignment

Steps for aligning AM Intermediate Frequency and Radio Frequency stages.

FM Alignment Procedures

Instructions for various FM alignment tasks including IF, RF, Stereo, Muting.

VU Meter Alignment

Steps for calibrating the VU meters.

Schematic Diagram

Circuit Diagram Overview

Visual representation of the electronic circuitry of the SG-40.

Circuit Board and Wiring Connections

PCB Layout and Wiring

Diagrams showing the layout of circuit boards and their wiring connections.

Wiring Connection Details

Specific Connection Points

Diagrams illustrating wiring connections at various points like P2, P3, P8, P9.

Replacement Parts List

Resistor Specifications

List of resistors with part numbers, descriptions, and specifications.

Capacitor Specifications

List of capacitors with part numbers, descriptions, and specifications.

Cabinet and Chassis Parts

List of replacement parts for the cabinet and chassis.

Cassette Tape Deck Parts

List of replacement parts specific to the cassette tape deck.

Parts Location - Cabinet and Chassis

Component Placement Diagrams

Diagrams showing the physical location of cabinet and chassis parts.

Exploded View - Cassette Tape Deck

Cassette Deck Component Assembly

Exploded view diagram showing the assembly of cassette tape deck components.

Block Diagram

System Functional Blocks

Diagram illustrating the functional blocks and signal flow of the SG-40.