Marantz 2238 Service Manual

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TABLE OF CONTENTS

Section Title Page
1. SERVICE NOTES ................................................................... 1
2. TEST EQUIPMENT REQUIRED FOR SERVICING ............................................ 2
3. AM ALIGNMENT PROCEDURE . . .. 2

3.1 AM IF Alignment ............................................................... 2
3.2 AM Frequency Range and Tracking Alignment ............................................ 2
4. FM ALIGNMENT PROCEDURE ......................................................... 2
4.1 FM Frequency Range and Tracking Alignment ............................................ 2
4.2 Stereo Separation Alignment ........................................................ 3
4.3 Muting Threshold Adjustment ....................................................... 3
4.4 FM Dolby Level Adjustment ........................................................ 3
5. POWER AMPLIFIER ADJUSTMENT ..................................................... 4
6. POWER SUPPLY ADJUSTMENT ........................................................ 4
7. VOLTAGE CONVERSION FOR EUROPEAN MODEL ......................................... 4
8. DIAGRAMS ....................................................................... 5
8.1 Block Diagram ................................................................. 5
8.2 Inter Connection Diagram - U.S.A. & CANADA ........................................... 7
8.3 Inter Connection Diagram - EUROPE .................................................. 9
8.4 Schematic Diagram - U.S.A. 81 CANADA ............................................... 11
8.5 Schematic Diagram - EU ROPE ....................................................... 13
8.6 Tuner Board Schematic Diagram and Component Locations ................................... 15
8.7 FM Front End Board Schematic Diagram and Component Locations ............................. 19
8.8 Phono Equalizer Amp. Board Schematic Diagram and Component Locations ........................ 20
8.9 Main Amp. Board Schematic Diagram and Component Locations ................................ 22
8.10 Power Supply Board Schematic Diagram and Component Locations .............................. 24
8.11 Pre., Tone Amp. Board Schematic Diagram and Component Locations ............................ 25
8.12 Mono, Hi Filter, Tape 1 Mom, FM 25 us Switches Board Schematic Diagram and Component Locations ...... 26
8.13 Mono. Hi Filter. Low Filter, Tape 1 Mon., Switches Board Schematic Diagram and Component
Locations - EUROPE ............................................................. 26
8.14 Speaker Switch Board Schematic Diagram and Component Locations ............................. 27
8.15 Dial Lamp Board Schematic Diagram and Component Locations ................................ 27
9. MAJOR COMPONENT LOCATIONS ...................................................... 28
9.1 Cabinet-Front View .............................................................. 28
9.2 Chassis-Top View ............................................................... 28
9.3 Cabinet-Rear View .............................................................. 29
9.4 Chassis-Bottom View ............................................................. 29
9.5 Cabinet-Front View - EUROPE ...................................................... 30
9.6 Chassis-Top View - EUROPE ........................................................ 30
9.7 Cabinet-Rear View . EUROPE ....................................................... 31
10. EXPLODED VIEW .................................................................. 32
10.1 Packing Material Expioded View ..................................................... 32
10.2 Mechanical Exploded View ......................................................... 33
11. PARTS LIST ...................................................................... 35
12. TECHNICAL SPECIFICATIONS ......................................................... 44

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