Marantz 2270 Service Manual
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Extracted text from Marantz 2270 Service Manual (Ocr-read)
Page 1
model 2270
Page 2
nnae- .053 ll
TABLE OF CONTENTS
, PAGE V
Introduction ............................................................. 1
1 Service Notes ............................................................ 1
i AM Tuner ............................................................... 1
FM Tuner ............................................................... 2
Phone and Tone Amplifiers ................................................. 4
Power Amplifier ......................................................... 4
Power Protection Circuit ............................................. ....... 5
Speaker Protection Relay Circuit ....... . ...................................... 5
Suggestion for Trouble Shooting of Power Amplifier ........................... . . . 5
Voltage Conversion ........................................................ 6
Test Equipment Required for Servicing ........................................ 8
AM Alignment Procedure ................................................... 9
FM Alignment Procedure .................................. . ................. 9
Stereo Separation Alignment ................................................ 9
Muting Circuit Alignment ................................................... 10
Audio Adjustment ........................................................ 10 '
Parts List ................... K. ............................................ 23
Specifications ............................................................ 33
LIST OF ILLUSTRATIONS
, ' FIGURE NO PAGE
' 1. Remove the Terminal Cover ..... - ........................................ 6
2. Voltage Conversion Chart ............................................... 7
3. Lissajou Figure on Oscilloscope ........................................... 11
4. Dial Stringing ......................................................... 11
5. Front Panel Adjustment and Component Locations ........................... 12
6. Main Chassis Component Locations (Top View) .............................. 12
7. Rear Panel Adjustment and Component Locations ............................ 13
8. Main Chassis Component Locations (Bottom View) ........................... 13
9. FM Front End Assembly P100 Component Locations .......................... 14
10. FM IF Amplifier Assembly P200 Component Locations ........................ 14
11. FM Detector Assembly P500 Component Locations ........................... 15
12. MPX Stereo Decoding Amplifier Assembly P300 Component Locations ............ 15
13. Muting Control Amplifier Assembly P550 Component Locations .................. 16
_ 14. AM Tuner Unit Assembly P150 Component Locations ......................... 16
15. Phone Amplifier Assembly P700 Component Locations ..................... . . . 17
16. Tone Amplifier Assembly P400 Component Locations ......................... 17
17. Tone Control Unit Assembly P450 Component Locations ..................... 18
18. Power Amplifier Assembly P750 Component Locations ........................ 197
'19. Regulated Power Supply and Protection Relay Circuit Assembly P800
Component Locations .................................................. 20
20. Mono, High and Low Filter Switch Unit Assembly P600 Component Locations ...... >21
21. Loudness, Muting and Speakers Switch Assembly P650 Component Locations ....... 21
22. Schematic Diagram .................................................... 22