Pioneer SX-1080 Service Manual

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MODEL SX-1080 COMES IN FIVE VERSIONS DISTINGUISHED AS FOLLOWS:
Type Voltage
Remarks
KU
120V only
U.S.A. model
KC 120V only Canada model
HG 220V and 240V (Switchablel Europe or Oceania model
S 110V. 120V, 220V and 240V (Switchable) General export model
S/G
110V. 120V, 220V and 240V (Switchable) U.S. Military model
NOTICE:
• This service manual is applicable to the SX-1080/KU.
• The SX'1080/HG, S/G, S, KC service manual is issued as an appendix.
CONTENTS
1. SPECIFICATIONS. 3
2. CONNECTION DIAGRAM. 5
3. FRONT PANEL FACILITIES. 7
4. DISASSEMBLY. 10
5. PARTS LOCATION
5.1 Front Panel View. 11
5.2 Front View with Front Panel Removed. 12
5.3 Top View with Bonnet Removed. 13
5.4 Bottom View with Bottom Plate Removed. 14
5.5 Rear Panel View. 15
6. LEVEL DIAGRAM. 16
7. BLOCK DIAGRAM . 17
8. CIRCUIT DESCRIPTIONS
8.1 Tuner .. 19
8.2 Phono, Mic Input Circuit. 20
8.3 Flat Amplifier. 20
8.4 Tone Control. 20
8.5 Power Amplifier. 20
' 8.6 Meter Amplifier... 21
8.7 Protection Circuit.-. 22
8.8 Power Supply. 22
1

Pioneer SX-1080 Specifications

General

Total Harmonic Distortion	0.1% (at rated power)
Tuning Range	FM, MW
Damping Factor	30
Input Sensitivity	2.5mV (MM), 150mV (line)
Output	150mV (line), 1V (Pre out)
Speaker Load Impedance	4Ω to 16Ω
Frequency Response	5Hz to 100kHz
Signal to Noise Ratio	90dB (line)
Semiconductors	4 x FET, 6 x IC
Power Output	120 watts per channel (8 ohms, 20Hz-20kHz)