Marantz 1120 Service Manual
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Extracted text from Marantz 1120 Service Manual (Ocr-read)
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TABLE OF CONTENTS
SECTION PAGE Service Notes . . . , ........ 12
Disassembly/Re-assembly Instructions 12
Introduction ........... 1 Top Cover _________ 12
Caution """""" l Heatsink Assembly ....... 12
Technical Specifications """" 2 Power Amplifier Board Assembly . 12
Recommended Test Equipment. . . . 3 Power Transistors ...... 13
Performance Verification ...... 5 Bias Diodes ......... 13
Test Procedure ......... 5 Front Panel ......... 13
TN Equipment """" 5 Phono/Select Board Assembly . . 13
Preliminary Procedures """ 5 X10/Tone Board Assembly . . . 14
Idling Power .Test """" 6 Power Supply Board Assembly . . 14
Relay Operation Test """ 6 Interconnect Board Assembly . . 14
DC Balance Test ....... 6 Pilot Lamp '''''''''' 15
Total Hum and Noise Test . . . 6 Power Transformer ______ 15
Maximum Power Output Test ' 6 Voltage Conversion Instructions . . 15
Harmonic Distortion Test . . . . 7 220%) AC Conversion _ _ _ _ 15
3m cm Te ------- 7 100-Volt AC Conversion . . . . 15
Frequency Response Test . . . . 7 Parts List ("Loose" Parts) _____ 16
Gem Te ' fl """" 7 Parts List - Jack Panel Board
Channel Separation Test . 7 Assembly ___________ 18
Fllter and Tone ClTCUlt Test . . . 7 Parts LlSt - PhonO/Select Board
Loudness Circuit Test ..... 8 Assembly ........... 20
Adjustment Procedure ------- 3 Parts List - Interconnection Board
Test Equipment ......... 8 Assembly ........... 22
Preliminary Procedures ...... 8 Parts List - X10/Tone Board Assembly 24
UHit Disassembly -------- 8 Parts List ~ Heatsink/Power
Bias Adjust ........... 8 Amplifier Board Assembly ..... 26
DC Balance Adjust ........ 8 Parts List - Power Supply Board
Assembly ........... 27