Marantz 4400 Service Manual

Page 2

SECTION PAGE

Introduction .............................................................. 1
Service Notes ....................................... - ..................... 1
AM Tuner .............................................................. 1
FM Tuner .............................................................. 2
PhonoandPre-Amplifier ......... 5
Dolby Unit ............................................ ' .................. 6
400Hz Tone .............................................................. 7
Dolby NR Switch .......................................................... 7
Record Level (L) (R) ...................................................... 8
Play Cal. (L) (R) .......................................................... 8
Dolby FM Preset Level Controls .............................................. 8
400Hz Tone Switch ................................................. ' ....... 8
FM De-Emphasis Switch, .................................................... 8
Hi-Low Filter Amplifier ..................................................... 8
Power Amplifier .......................................................... 8
BTL (Balanced Transformer-less) Connection .................................... 9
Power Supply Circuit ....................................................... 9
Audio Trouble Analysis .................................................... 9
Scope Display Circuit ....................................................... 9
Scope Circuit Description ................................................... 10
Trouble Shooting of Oscilloscope Circuit .................... - ................... .11
Test Equipment Required for Servicing ......................................... 12
Scope Display Alignment ................................... l ............... 12
AM Tuning Display Alignment ............................................... 13
FM Tuning Display Alignment. . . . . . . . . . . ...................................... 13
AMAIignmentProcedure 13
FM Alignment Procedure .................................................... 13
Audio Adjustment ........................................................ 15
Automatic Voltage Regulator Adjustment ...................................... 15
Dolby Alignment Procedures .......................................... . ...... 15
Alignment Procedures of Dolby FM Preset Level Controls .......................... 16
Explanation of the Dolby Processing Chart ...................................... 17

Parts List ............................................................. 32 ~ 51

Technical Specifications .................................................. 52, 53

LIST OF ILLUSTRATIONS

FIGURE PAGE
1. Block Diagram of the HA1156 ............................................ 4
2. Dial Stringing .......................................................... 14
3. Dolby Alignment Implement Simplified Schematic ............................ 16
4. Front Panel Adjustment and Component Locations ............................ 19
5. Main Chassis Component Locations (Bottom View) ............................ 19
6. Rear Panel Adjustment and Component Locations .............................. 20
7. Main Chassis Component Locations (Top View) ................................ 20
8. FM Front End Assembly P100 Component Locations .......................... 21
9. AM Tuner Assembly P150 Component Locations .............................. 21

10. FM IF Amplifier Assembly P200 Component Locations .......................... 21