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Service SR7400 /K1G/L1G/N1B/U1B
/N1S/S1G
Manual AV Surround Receiver
PS7400 /F1N
AV Surround Ampli er
AV SURROUND RECEIVER SR7400
SELECTOR VOLUME
DOWN UP
CLEAR MEMORY TUNING F/P MODE
PS7400
SPEAKERS A/B MULTI MULTI SPEAKER 7.1CH INPUT AUX2
SELECT ENTER MUTE S-DIRECT
TV DVD VCR1 DSS/VCR2 AUX1 CD-R TAPE CD TUNER
STANDBY
AUX1 INPUT
DIGITAL S-VIDEO VIDEO L AUDIO R
POWER ON/STANDBY PHONES
www.electronicsrepair.net
SR7400
TABLE OF CONTENTS
SECTION PAGE
1. TECHNICAL SPECIFICATIONS ............................................................................ 1
2. TECHNICAL DESCRIPTION ................................................................................. 4
3. WIRING DIAGRAM................................................................................................ 7
4. BLOCK DIAGRAM................................................................................................. 9
5. SCHEMATIC DIAGRAM ...................................................................................... 11
6. PARTS LOCATION .............................................................................................. 29
7. IC DATA................................................................................................................ 42
8. EXPLODED VIEW AND PARTS LIST ................................................................. 53
9. POWER AMPLIFIER ADJUSTMENT .................................................................. 57
10. SERVICE MODE ................................................................................................. 58
11. SYSTEM ERROR ................................................................................................ 60
12. UPDATE FIRMWARE .......................................................................................... 61
13. ELECTRICAL PARTS LIST ................................................................................. 63
Please use this service manual with referring to the user guide ( D.F.U. ) without fail.
SR7400 / PS7400
Part no. 37AW855010
First Issue 2003.11
ecm
MARANTZ DESIGN AND SERVICE
Using superior design and selected high grade components, MARANTZ company has created the ultimate in stereo sound.
Only original MARANTZ parts can insure that your MARANTZ product will continue to perform to the specifications for which
it is famous.
Parts for your MARANTZ equipment are generally available to our National Marantz Subsidiary or Agent.
ORDERING PARTS :
Parts can be ordered either by mail or by Fax.. In both cases, the correct part number has to be specified.
The following information must be supplied to eliminate delays in processing your order :
1. Complete address
2. Complete part numbers and quantities required
3. Description of parts
4. Model number for which part is required
5. Way of shipment
6. Signature : any order form or Fax. must be signed, otherwise such part order will be considered as null and void.
USA EUROPE / TRADING CANADA
MARANTZ AMERICA, INC MARANTZ EUROPE B.V. LENBROOK INDUSTRIES LIMITED
1100 MAPLEWOOD DRIVE P. O. BOX 8744, BUILDING SILVERPOINT 633 GRANITE COURT,
ITASCA, IL. 60143 BEEMDSTRAAT 11, 5653 MA EINDHOVEN PICKERING, ONTARIO L1W 3K1
USA THE NETHERLANDS CANADA
PHONE : 630 - 741 - 0300 PHONE : +31 - 40 - 2507844 PHONE : 905 - 831 - 6333
FAX : 630 - 741 - 0301 FAX : +31 - 40 - 2507860 FAX : 905 - 831 - 6936
AMERICAS AUSTRALIA HONG KONG
SUPERSCOPE TECHNOLOGIES, INC. TECHNICAL AUDIO GROUP PTY, LTD Jolly ProAudio Broadcast Engineering Ltd.
MARANTZ PROFESSIONAL PRODUCTS 43-53 Bridge Rd., UNIT 2, 10F, WAH HUNG CENTRE,
2640 WHITE OAK CIRCLE, SUITE A STANMORE NSW 2048 41 HUNG TO ROAD, KWUN TONG, KLN.,
AURORA, ILLINOIS 60504 USA AUSTRALIA HONG KONG
PHONE : 630 - 820 - 4800 PHONE : +61 - (0)2 - 9519 - 0900 PHONE : 852 - 21913660
FAX : 630 - 820 - 8103 FAX : +61 - (0)2 - 9519 - 0600 FAX : 852 - 21913990
AUSTRALIA THAILAND SINGAPORE
QualiFi Pty Ltd, MRZ STANDARD CO., LTD WO KEE HONG DISTRIBUTION PTE LTD
24 LIONEL ROAD, 746 - 754 MAHACHAI ROAD., 130 JOO SENG ROAD
MT. WAVERLEY VIC 3149 WANGBURAPAPIROM, PHRANAKORN, #03-02 OLIVINE BUILDING
AUSTRALIA BANGKOK, 10200 THAILAND SINGAPORE 368357
PHONE : +61 - (0)3 - 9543 - 1522 PHONE : +66 - 2 - 222 9181 PHONE : +65 6858 5535 / +65 6381 8621
FAX : +61 - (0)3 - 9543 - 3677 FAX : +66 - 2 - 224 6795 FAX : +65 6858 6078
NEW ZEALAND TAIWAN MALAYSIA
WILDASH AUDIO SYSTEMS NZ PAI- YUING CO., LTD. WO KEE HONG ELECTRONICS SDN. BHD.
14 MALVERN ROAD MT ALBERT 6 TH FL NO, 148 SUNG KIANG ROAD, 2ND FLOOR BANGUNAN INFINITE CENTRE
AUCKLAND NEW ZEALAND TAIPEI, 10429, TAIWAN R.O.C. LOT 1, JALAN 13/6, 46200 PETALING JAYA
PHONE : +64 - 9 - 8451958 PHONE : +886 - 2 - 25221304 SELANGOR DARUL EHSAN, MALAYSIA
FAX : +64 - 9 - 8463554 FAX : +886 - 2 - 25630415 PHONE : +60 - 3 - 7954 8088
FAX : +60 - 3 - 7954 7088
JAPAN Technical KOREA
MARANTZ JAPAN, INC. MK ENTERPRISES LTD.
35- 1, 7- CHOME, SAGAMIONO ROOM 604/605, ELECTRO-OFFICETEL, 16-58,
SAGAMIHARA - SHI, KANAGAWA 3GA, HANGANG-RO, YONGSAN-KU, SEOUL
JAPAN 228-8505 KOREA
PHONE : +81 42 748 1013 PHONE : +822 - 3232 - 155
FAX : +81 42 741 9190 FAX : +822 - 3232 - 154
SHOCK, FIRE HAZARD SERVICE TEST :
CAUTION : After servicing this appliance and prior to returning to customer, measure the resistance between either primary AC
cord connector pins ( with unit NOT connected to AC mains and its Power switch ON ), and the face or Front Panel of product and
controls and chassis bottom.
Any resistance measurement less than 1 Megohms should cause unit to be repaired or corrected before AC power is applied, and
verified before it is return to the user/customer.
Ref. UL Standard No. 1492.
In case of difficulties, do not hesitate to contact the Technical
Department at above mentioned address.
030307MIT
1. TECHNICAL SPECIFICATIONS
FM TUNER SECTION [SR7400] VIDEO
Frequency Range.............................................87.5 - 108.0 MHz Television Format ....................................................... NTSC/PAL
Usable Sensitivity ........................................IHF 1.8