Marantz 4240 Service Manual

Page 2

TABLE OF CONTENTS

SECTION PAGE
Introduction .................................................................. 1
Service Notes ................................................................. 1
AM Tuner ................................................................... 1
FM Tuner ................................................................... 2
Phone and Pre-Amplifier ....................................................... 4
Dolby Unit .................................................................. 5
400Hz Tone ................................................................. 5
Dolby Switch ............................................... - ................. 5
Power Amplifier .............................................................. 5
BTL (Balanced Transformerless) Connection ........................................ 5
Power Supply Unit ............................................................ 6
Audio Trouble Analysis ........................................................ 7
Test Equipment Required for Servicing ............................................ 7
AM Alignment Procedure ....................................................... 7
FM Alignment Procedure ....................................................... 8
Audio Adjustment ............................................................ 9
Automatic Voltage Regulator Adjustment .......................................... 9
Dolby Alignment Procedures .............................................. ...... 9
Alignment Procedures of Dolby FM Preset Level Controls ............................. 10
Explanation of the Dolby Processing Chart ........................................ 10
Parts List ................................................... V ................ 27
Technical Specifications ........................................................ 42
LIST OF ILLUSTRATIONS
FIGURE PAGE
1. Main Chassis Component Locations (Bottom View) ............... ' ............... 12
2. Front Panel Adjustment and Component Locations ............................... 12
3. Main Chassis Component Locations (Top View) .................................. 13
4. Rear Panel Adjustment and Component Locations ................................ 13
5. Dial Stringing ......................................... * ................... 14
6. FM Front End and AM Tuner Assembly P100 Component Locations .................. 15
7. FM IF Amplifier Assembly P200 Component Locations ............................ 16
8. MPX Stereo Decoder, Noise and DC Amplifier Assembly P300 Component Locations ..... 15
9. Phono Amplifier Assembly P400 Component Locations ............................ 17
10. Vari-Matrix Unit Assembly P500 Component Locations . , ........................... 17
11. Dolby Unit Assembly P600 Component Locations ................................ 18
12. Power Amplifier Assembly P700 Component Locations ............................ 18
13. Power Supply Assembly P800 Component Locations .............................. 19
14. FM De-emphasis Switch Unit Assembly PC01 Component Locations .................. 19
15. Buffer Amplifier Assembly PD01 Component Locations ........................... 20
16. Tone Amplifier Assembly PE01 Component Locations ............................. 20
17. Tone Control Unit Assembly PF01 Component Locations .......................... 21
18. Balance Control Unit Assembly PGO1 Component Locations ........................ 21
19. 400Hz Oscillator and Meter Driver Assembly PL01 Component Locations .............. 21
20. Loudness, Hi Filter, Speaker and Power Switch Unit Assembly P801 Component Locations 22
21. Tape Monitor Switch Unit Assembly PT01 Component Locations .................... 22
22. Indicator Lamps Assembly PY01 Component Locations ............................ 22
23. Dial Lamps Assembly P201 Component Locations ................................ 22
24. Schematic Diagram ..................................................... 23 24
25. Exploded Mechanical Diagram ........................................... 25: 26
TABLE PAGE
1. Test Equipment Required for Servicing ......................................... 7

2. Dolby Processing Chart ..................................................... 11

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