Marantz 2285 B Service Manual

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' SERVICE
MANUAL

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model 22858

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TABLE 0 F CONTENTS

Section Title Page
1. PW. BOARDS ....................................................................... 1
2. TEST EQUIPMENT REQUIRED FOR SERVICING ................................................. 1
3. AM ALIGNMENT PROCEDURES 2

3.1 AM IF Alignment .................................................................. 2
3.2 AM Frequency Range and Tracking Alignment ................................................. 2
3.3 AM Signal Strength Meter Alignment ....................................................... 2

4. FM ALIGNMENT PROCEDURES ........................................................... 2
41 FM Frequency Range and Tracking Alignment ................................................. 2
4.2 Stereo Separation Alignment ..................... 2
4.3 Muting Circuit Alignment ...................... > 2
4.4 Dolby FM Tape Output Setting .......................................................... 2

5. AUDIO ADJUSTMENT .................................................................. 2
6. VOLTAGE CONVERSION FOR EUROPEAN MODEL ............................................... 3
7. DIAGRAMS ........................................................................ 5
7.1 Block Diagram .................................................................... 5
7.2 Connection Diagram - U.S.A. & Canada ..................................................... 7
7.3 Connection Diagram - Europe ........................................................... 9

8. SCHEMATIC DIAGRAMS AND COMPONENT LOCATIONS ........................................... 11
8.1 FM Front End Circuit Board P100 ........................................................ 11
8.2 AM Tuner, FM IF & MPX Stereo Decorder Circuit Board P200 ........................................ 12
8.3 Phono Amp Circuit Board P400 .......................................................... 13
8.4 Main Amp Circuit Board P700 ........................................................... 14
8.5 Power Supply Circuit Board P800 ......................................................... 15
8.0 Pre and Tune Amp Circuit Board PE01 . . . Q .................................................. 16
3.7 Monitor and Filter Switches Circuit Board P801 ................................................ 17
8.8 Dolby Socket Circuit Board PK01 ......................................................... 18
8.9 Function Lamp Circuit Board PY01 ....................................................... 10
8.10 Dial Lamp Circuit Board P201 ........................................................... 18
8.11 Antenna Muting Circuit Board PC01 ....................................................... 18
8.12 Speaker Switches Circuit Board PN01 ...................................................... 19

9. MAJOR COMPONENT LOCATIONS . . . . .* ................................................... 20
9.1 Cabinet Front View .............................................................. 20
9.2 Chassis - Top View ............................................................... 20

9.3 Cabinet - Rear View ............................................................... 21
9.4 Chassis - Bottom View ............................................................... 21

10. EXPLODED VIEWS .................................................................. 22
10.1 Rear Panel Exploded View - U.S.A. & Canada .................................................. 22
10.2 Rear Panel Exploded View - Europe ....................................................... 22
10.3 Front Panel Exploded View ....................................... ' ..................... 23
10.4 Chassis Exploded View ............................................................... 25
10.5 Packing Material Exploded View ......................................................... 27

11. PARTS LIST ........................................................................ 23

12. TECHNICAL SPECIFICATIONS ............................................................ 41

13. SCHEMATIC DIAGRAMS ................................................................ 43