Crown D-75 Service Manual

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Table of Contents
1 Introduction ___ . ___ . ______ . ___ ._._. __ .. _._ ... _ . .. __ . ____ I-I
7 Specifications ___ ... .... _. __ ._._._._._._. _____ ._. _____ 7- 1
1.1 TheD-75 ..................................................... 1-1 7.1 Ge n era l ....................................................... 7-1
1. 2 Warramy ................................ .. ................ ",1- ,1 7.2 Monaural, ................................................... 7-1
7.3 Stecoo ......................................................... 7-2
2 Facilities. ___ . _____ .... _._._ ... _ .................. _._ ... _._ 2- 1
7.4 PcrfonnanceGraphs ...................................... 7-4
3 Required Test EquipmenL ... _ ..... _ ...... 3-1
8 Schematics ._ .. _._ ... _ .. _ .... __ ... .. ___ .. ______ ._ ... _ ... 8-1
4 Maintenance ........................................... 4·1
4.1 Safety First .... ............................................. 4-1
4.2 Inspec ti on ................................................... 4-1
4.3 Disassembly .. . .............. .......................... .... 4-\
4.4 Reassembly ................................................. 4-2
4.5 Troubleshooting ........................................... 4-2
9 Parts._ .... .... .. _ .... __ ........ _ ._._._ ... ___ ._._._ ... _ ... _ ... 9-1
9. 1 General Infonnat.ion ...................................... 9-1
9.2 Standard and Special Parts .............................. 9-\
9.3 Ordering P aIlS .............................................. 9-1
9.4 S hipm ent .................................................... 9-\
9.5 Te nn s ......................................................... 9- \
9.6 lIlu SU'atcd Parts Li sts .................................... 9-2
5 Voltage Conversion ___ ._._ . _._._._ ... _. ___ . ______ 5-1
Appendics A: Installallon. ___ ._ .............. _. A-I
A. I Mo untin g ........ .......................................... A·I
6 Circuit Theory_ .. _._._._. _________ .......... _._ . _._._._ 6- 1
A.2 Wiring ....................................................... A·I
6. 1 Block Diagram Circuil Th eory ....................... 6·'
6.2 Balanced/Unbalanced Input Stage .... ............. .. 6-2
6.3 Inpu t Operational Amplifier ........................... 6-2
6.4 Signal Translator ............ _ ............................ 6-2
6.5 Fi nal Voltage Amplifier ................................ 6-3
A.2.1 SLC r co ..................................................... A-I
A.2.2 Monaural ................................................ A-I
A.3 Input ......................................................... A·I
A.4 Ou t pU I. ...................................................... A-2
A.S Load Potcction ........................................... A·3
6.6 Bias .......................................................... 6-3
6.7 Ou tput Stage ............................................... 6·3
Appendics B: Operation .......... _ ... ___ ._._ ... 8-1
6.8 Pro tection Circu itry .. ........... .. .. .................... 6-3
B.I Precautions ................................................. B-1
6.9 I {)Cn.I (InputlOutpu(Comparator) .................. 6-4 B.2 Controls ..................................................... B-1
6 .1 0 Sig nal Prcscnce Ind ica tor ............................. 6-4
B.3 PrOLCction .................................................. B· I
B.4 Fuse Rcplacemcnl .. ..................................... B-2

Crown D-75 Specifications

General

Brand	Crown
Model	D-75
Category	Amplifier
Language	English