Sansui AU 7500 Service Manual

Page 1

OPERATING INSTRUCTIONS
& SERVICE MANUAL

AM /FMZSTEREO AMPLIFIER

SANSUI ELECTRIC CO., LTD.

Page 2

We are grateful for your choice of the AU-7500 Integrated
Amplifier.

For over a quarter of a century, Sansui has been building hi-fi
audio equipment, and nothing else. Our mission is very old and at
once ever new to us: to bring the reproduced sound closer and
closer to the original.

The AU-7500 now in your hands is one answer from us to this
never-ending quest. It is a product of the cream of sophisticated
modern audio-electronics knowhow, coupled with our long ex-
perience, and as such, we present it to you with our full confidence.
The AU-7500 is a new breed of Sansuis AU series integrated
amplifiers. Its tone quality has been polished and perfected through
an unprecedented number of listening tests in different acoustic
environments. We feel certain that you will like it, but you will
find this out as soon as you play your first record through it.

This manual has been prepared to guide you in operating and
caring for the amplifier correctly, so that you will get the most out
of its built-in high performance and exceptional versatility.

May we suggest that you read it once carefully?

CONTENTS

SWITCHES AND CONTROLS ....................................... 3,4
SETTING UP YOUR AU-7500/

OPERATING PROCEDURE .................................... 5, 6
RECORDING AND PLAYBACK BY TAPE DECKS ............ 7
UPGRADING YOUR STEREO (4-CHANNEL STEREO

SYSTEM/ELECTRONIC CROSSOVER SYSTEM) ...... 8
SIMPLE MAINTENANCE HINTS/ACCESSORY LIST 9, 10
QUICK CHECK LIST OF SIMPLE MISTAKES .................. 11
SPECIFICATIONS ...................................................... 12
SCHEMATIC DIAGRAM .......................................... 13, 14
NOTES TO SERVICE ENGINEERS ................................. 15
GENERAL TROUBLESHOOTING CHART ..................... 16
DISASSEMBLY PROCEDURE ....................................... 17
ALIGNMENT ............................................................ 18
PRINTED CIRCUIT BOARDS AND PARTS LIST ......... 19~24

OTHER PARTS AND THEIR POSITION ON CHASSIS... 25, 26

Page 24

OTHER PARTS AND THEIR POSITION 0N CHASSIS

W: Pans No, X:

Parts Name Y: Stock No.

- -
w x v w 1 x 1 v
R501 100m. 0101104 C005 1 0 2211; 1
1 . _ 0592228
R502 100110 0101104 C007 0.22101 i'°% 250" MP' 0592228
R503 100110. 0101104 C008 2200115 53v EC. 0559505
R504 100119 0101104 Con 0.022111 :20% 250v we. 0505227
R305 551151 0101553 C014 1000111 50v ac. 0559302
R505 55m 1 0101553 c5111 0104710 0660473
R307 47m 1 0101473 5:: 1 0.047111 :10% 50v cc. 0550473
Rm 4710 ' 0101473 C02 1 47! 60473
R509 100m 1 0101154 C02: 3309. +10% 50v cc 066035
R510 180119, 0101104 330pF1 - - 0550331
R511 lOOkfl 0101104 TR309 0305620,1.2
R512 100119, 0101104 1310 1} 2$C680(A. B. C) 030552012
R513 10110, 10% MW CR» 0101103 TRBII 1 1 0300150.1,2
R514 10m, 1 0101103 TRm ,1 25A566(A, s, C) 030015012
R515 68011.0. 0101684 TR513 11 1 0305450,],2
R515 500110 I 0101534 TRsu 1 2509301. V. BL) 03054501.:
R517 1001151 11101104 1111115 _ 0300350.1.2
R5111 100m. 0101104 TR815 } 25A553 (R. Y. 8!.) 1 0300350,I,2
:5 last 0101 104 Power Transismr 50:1131 (Big) 2030020
R520 3 0101 104 Power Transislor Socket (Small) 2030030
52 100k 0101104
R522 100m 1 011,110,, D°°' 1} 502 0310550
R523 10011.0 1 0101104 1.00! 4290221
R524 10011.0. 0101104 [301 } Slobilizing Coil for High Frequency Range 1 429022]
R525 100110 0101104 5 ' 1
R525 100m. 1 0101104 ' SELECTOR 1 1105130
R5,, 5.019] + 5% yw CR 0107502 :2 TAPE T0 TAPE REPRINT 1 1170290
R 5211 5.31 n .. 4 - 0107502 5:: :APE MONITOR 1 1170290
Rm 330119 0101334 55 "ONO 2 "CK? 10.41) 1 1110110
Rm 3301 n 0101334 5 4CH ADAPTOR 1 1170300
6
R795 55011.0 0101554 5, MODE SW'TCH 1101190
R795 55010 0101554 5 MUT'NG "270
R047 100, i10% MW CR. 0101100 5 LOUDNESS . 1170270
Rm 100. 0101100 59 LOW 1111511 1170270
R049 109 0101100 2'0 H1311 FILTER 1 1170270
11
R350 100 0101100 POWER/SPEAKERS 1101420
R553 0.47.0 0155478 1501 1} MIC 1 11 2430190
R054 0.4751 110% SW c.1z 0155470 J50? 1 2430190
R055 0.470 ' 0155470 1503 1 DIN 55:11.1 2430040
R1155 0.47.0 01554711 1501 Mu11i-Connec1or (1.2028) 2420040
R057 4.79 0104479 530 1 HEADPHONES 2430220
R658 4.7.0 0104479
R059 ml 0104551 T001 Power 1.51.5151..." 4001150
R860 5600 $1096 lW CR. 0104561 C0001 AC 0.1115. (UNSWITCHED) 2450040
R009 12111 0104123 C0002 AC 0111.1(sw11CH50) 2450040
1:0") 321$ 0104552 C0003 AC 0.11151 (swncuso) 2450040
011 . 0104552 1
F001 1 Power Fuse (34) 0433040
VR701 1 Power Fuse Holder 2300060
VRm ] 25011.0(M.N) BALANCE 1010350 F002 1 (+pomrswp1y1c11.) 0433272
VR703 F003 Qulck-Acllng Fuse (+P0wer Supw1Y1Rch-) 0433277
VR I 25011.0. (B) X 2 VOLUME 1010850 F004 4A (-Power Supply. Lch.) 0433272
VR7O F005 (-Power Supply.l1ch.) 0433272
:2: } 100m (0)x 2 BASS 1010050 :3; :2} WI 0d 1 r 3232::
f fl U59
:22; } 100m (13) x 2 MIDRANGE 1010050 F 3" 03
Wm PL001 I Power |nd1calor(6.3V 250mA) 0400090
Wm } 100m (W)x 2 11151315 1010040 U Power lndlcalor 50:151 2320050
P 001 Volloge Salecvor
1 M ' Pl 2410180
C003 0.01 yr :1095 1.411v cc. 0559301 1 51:1,? 2410190
C004 6800M] 50V CC. 0515682 1 Socket 2410170
C005 6800111: 0515682 1 Plimed Clrcuil Board for Pro1eckoanse 15-1456 2598120