Marantz MA-9-S-1 Service Manual
Service
MA9S1 /F1N/N1G/U1G
Manual
SECTION PAGE
1. TECHNICAL SPECIFICATIONS ................................................................................. 1
2. CAUTION ....................................................................................................................1
3. ALIGNMENTS............................................................................................................. 2
4. BLOCK DIAGRAM ...................................................................................................... 4
5. WIRING DIAGRAM ..................................................................................................... 5
6. SCHEMATIC DIAGRAM.............................................................................................. 7
7. PARTS LOCATION .................................................................................................... 11
8. EXPLODED VIEW AND PARTS LIST ....................................................................... 17
9. ELECTRICAL PARTS LIST....................................................................................... 20
Monaural Power Amplifi er
MA-9S1
TABLE OF CONTENTS
Please use this service manual with referring to the user guide ( D.F.U. ) without fail.
Printed on 100% Recycled Paper
Printed in Japan
MA-9S1
Part no. 339J855020
First Issue 2003.09
ecm
MARANTZ DESIGN AND SERVICE
Using superior design and selected high grade components,
Only original
MARANTZ
parts can insure that your
MARANTZ
MARANTZ
product will continue to perform to the specifi cations for which
company has created the ultimate in stereo sound.
it is famous.
Parts for your
MARANTZ
ORDERING PARTS :
equipment are generally available to our National Marantz Subsidiary or Agent.
Parts can be ordered either by mail or by Fax.. In both cases, the correct part number has to be specifi ed.
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
MARANTZ AMERICA, INC
1100 MAPLEWOOD DRIVE
ITASCA, IL. 60143
USA
PHONE : 630 - 741 - 0300
FAX : 630 - 741 - 0301
AMERICAS
SUPERSCOPE TECHNOLOGIES, INC.
MARANTZ PROFESSIONAL PRODUCTS
2640 WHITE OAK CIRCLE, SUITE A
AURORA, ILLINOIS 60504 USA
PHONE : 630 - 820 - 4800
FAX : 630 - 820 - 8103
EUROPE / TRADING
MARANTZ EUROPE B.V.
P. O. BOX 8744, BUILDING SILVERPOINT
BEEMDSTRAAT 11, 5653 MA EINDHOVEN
THE NETHERLANDS
PHONE : +31 - 40 - 2507844
FAX : +31 - 40 - 2507860
AUSTRALIA
TECHNICAL AUDIO GROUP PTY, LTD
43-53 Bridge Rd.,
STANMORE NSW 2048
AUSTRALIA
PHONE : +61 - (0)2 - 9519 - 0900
FAX : +61 - (0)2 - 9519 - 0600
CANADA
LENBROOK INDUSTRIES LIMITED
633 GRANITE COURT,
PICKERING, ONTARIO L1W 3K1
CANADA
PHONE : 905 - 831 - 6333
FAX : 905 - 831 - 6936
HONG KONG
Jolly ProAudio Broadcast Engineering Ltd.
UNIT 2, 10F, WAH HUNG CENTRE,
41 HUNG TO ROAD, KWUN TONG, KLN.,
HONG KONG
PHONE : 852 - 21913660
FAX : 852 - 21913990
AUSTRALIA
QualiFi Pty Ltd,
24 LIONEL ROAD,
MT. WAVERLEY VIC 3149
AUSTRALIA
PHONE : +61 - (0)3 - 9543 - 1522
FAX : +61 - (0)3 - 9543 - 3677
NEW ZEALAND
WILDASH AUDIO SYSTEMS NZ
14 MALVERN ROAD MT ALBERT
AUCKLAND NEW ZEALAND
PHONE : +64 - 9 - 8451958
FAX : +64 - 9 - 8463554
JAPAN
MARANTZ JAPAN, INC.
35- 1, 7- CHOME, SAGAMIONO
SAGAMIHARA - SHI, KANAGAWA
JAPAN 228-8505
PHONE : +81 42 748 1013
FAX : +81 42 741 9190
Technical
THAILAND
MRZ STANDARD CO., LTD
746 - 754 MAHACHAI ROAD.,
WANGBURAPAPIROM, PHRANAKORN,
BANGKOK, 10200 THAILAND
PHONE : +66 - 2 - 222 9181
FAX : +66 - 2 - 224 6795
TAIWAN
PAI- YUING CO., LTD.
6 TH FL NO, 148 SUNG KIANG ROAD,
TAIPEI, 10429, TAIWAN R.O.C.
PHONE : +886 - 2 - 25221304
FAX : +886 - 2 - 25630415
SHOCK, FIRE HAZARD SERVICE TEST :
SINGAPORE
WO KEE HONG DISTRIBUTION PTE LTD
130 JOO SENG ROAD
#03-02 OLIVINE BUILDING
SINGAPORE 368357
PHONE : +65 6858 5535 / +65 6381 8621
FAX : +65 6858 6078
MALAYSIA
WO KEE HONG ELECTRONICS SDN. BHD.
2ND FLOOR BANGUNAN INFINITE CENTRE
LOT 1, JALAN 13/6, 46200 PETALING JAYA
SELANGOR DARUL EHSAN, MALAYSIA
PHONE : +60 - 3 - 7954 8088
FAX : +60 - 3 - 7954 7088
KOREA
MK ENTERPRISES LTD.
ROOM 604/605, ELECTRO-OFFICETEL, 16-58,
3GA, HANGANG-RO, YONGSAN-KU, SEOUL
KOREA
PHONE : +822 - 3232 - 155
FAX : +822 - 3232 - 154
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
verifi ed before it is return to the user/customer.
Ref. UL Standard No. 1492.
In case of diffi culties, do not hesitate to contact the Technical
Department at above mentioned address.
030307MIT
1. TECHNICAL SPECIFICATIONS
Rated power output (20 Hz to 20 kHz) ................... 300 W (8 Ω load)
600 W (4 Ω load)
Total harmonic distortion ........................................................ 0.01 %
(20 Hz to 20 kHz, 8 Ω load)
Output bandwidth .......................................................5 Hz to 50 kHz
(8 Ω load, 0.05 %)
Frequency response................................................. 3 Hz to 120 kHz
(+0 / -3 dB)
Damping factor ............................................................................ 200
(20 Hz to 20 kHz, 8 Ω load)
Inout sensitivity / Inout impedance ........1.7 V / 20 kΩ (BALANCED)
1.7 V / 20 kΩ (UNBALANCED)
S/N (IHF A network, input shorted) ................. 120 dB (BALANCED)
120 dB (UNBALANCED)
Level of voltage amplifi cation............................. 29 dB (BALANCED)
29 dB (UNBALANCED)
Attenuation .....................................................0, -3, -6, -9, -12, ∞ dB
Supply voltage [/F]............................................ 100 V AC, 50 / 60 Hz
[/N] .................................................. 230 V AC, 50 Hz
[/U] .................................................. 120 V AC, 60 Hz
Power consumption [/F]........................................................... 450 W
1200 W (4 Ω, 600 W driven)
[/N]........................................................... 500 W
1200 W (4 Ω, 600 W driven)
[/U] ............................................................ 5.8 A
13 A (4 Ω, 600 W driven)
Dimensions
Width ................................................................................ 459 mm
Height ............................................................................... 198 mm
Depth................................................................................ 451 mm
Weight ................................................................................... 35.8 kg
Caution : (The layout of this amplifi er is well concerned for sound quality.)
1. When screws and washers are removed, those parts must be set to the same places.
2. When wires are removed, the wires must be installed in the same roots, same places.
3. Do not hold the side panel (001D, 002D) and the bracket (915G) to move the unit when the unit is disassembled.
1
3. ALIGNMENTS
METER 8 OHM LOAD 4 OHM LOAD
0 dB 300 W 600 W
-10 dB 30 W 60 W
-20 dB 3 W 6 W
-30 dB 0.3 W 0.6 W
-40 dB 0.03 W 0.06 W
2
Adjustment Procedure
Set the power voltage to rated voltage for this adjustment
4. BLOCK DIAGRAM
DC Offset Voltage Adjustment
1. Before turning on power, set the attenuator switch(S201) at –∞, and turn the variable resisters R641
and R642 on the PCB(P641) counterclockwise to the end.
Insert digital voltage meters between the SPEAKERS–1 "+" terminal on the rear panel and the GND
terminal of C001/C002, and between the SPEAKERS–1 "–" terminal on the rear panel and the GND
terminal of C001/C002.
2. After the all preparation in Step 1 is done, turn on power. Just after the speaker relays turning on, make
the adjustment to set the offset voltages of the SPEAKERS–1 "+" terminal and the SPEAKERS–1 "–"
terminal to 0V ± 20mV.
Also, the difference between the offset voltages of the SPEAKERS–1 "+" terminal and the SPEAKERS
–1 "–" terminal must be within ±3mV.
• Offset voltage between the SPEAKERS–1 "+" terminal and GND
Insert an adjustment screw driver to the adjustment hole on the cupper cover of the HDAM Q501 on
the PCB P501 and adjust.
• Offset voltage between the SPEAKERS–1 "–" terminal and GND
Insert an adjustment screw driver to the adjustment hole on the cupper cover of the HDAM Q502 on
the PCB P501 and adjust.
Idling Current Adjustment
1. After DC Offset Voltage Adjustment is completed, adjust the idling current with the variable resisters
R641 and R642 on the PCB(P641).
2. Connect a digital voltage meter in between the 1 pin and the 3 pin of J639 and in between the 1 pin
and the 3 pin of J641 each. Connect the 1 pin terminals of J639 and J641 to "+" and the 3 pin to "–".
3. With seeing the digital voltage meter, turn the variable resisters clockwise slowly to adjust the idling
current.
• Idling current adjustment with R641
R641 is to adjust the idling current for the power transistor(s) on the upper side of the heat sink.
Turn R641 clockwise to increase the idling current. The voltage measured by the digital voltage
meter connected to J639 will increase.
• Idling current adjustment with R642
R642 is to adjust the idling current for the power transistor(s) on the lower side of the heat sink.
Turn R642 clockwise to increase the idling current. The voltage measured by the digital voltage
meter connected to J641 will increase.
4. The voltage of the idling current will be 10mV(50mA) for each.
The voltage reaches approx. 12mV(60mA) 3 minutes after turning on power then the voltage decreases
slowly to approx. 10mV(50mA) about 40 minutes after and becomes stable.
UNBALANCED
INPUT
1
BALANCED
2
12
3
INPUT
SELECTOR
SOFT
START
ATT
ATT
REGULATOR
I/V
I/V
SPEAKER
OUTPUT
I/V
I/V
PROTECT
FINAL STAGE
INPUT / DRIVE STAGE
METER / PROTECT
Meter Adjustment
1. Connect an oscillator to the input terminal UNBALANCED-1 and connect an AC voltage meter to the
speaker output terminals. ATTENUATOR is set to 0dB and no load is connected to the speaker output.
2. Turn on power and adjust output power (output frequency 1kHz) of the oscillator to set the speaker output
voltage to 49.0V.
3. When the speaker output voltage becomes 49.0V, adjust the variable resistor R917 on the PCB P801
to set the meter 0dB. (Output voltage 49.0V means 300W for 8Ω, 600W for 4Ω.)
4. Assuming this point as 0db, decrease the output power of the oscillator like –10dB ➔ –20dB ➔ –30dB
➔ –40dB, the meter will show the corresponding measurements.
3 4
5. WIRING DIAGRAM
P201
INPUT ATT SW
J206(5P)
W014
AC IN
L004
J801(3P)
W003
J852(2P)
J803(4P)
J851(2P)
P851
AC INPUT
(SOFT START)
J804(3P)
POWER SUPPLY
(& METER DRIVE)
P801
J854(2P)
W033
L001
POWER
TRANS
J802(3P)
J822(1P)
J809(5P)
W032
W006
C001
C002
W015
W010
W029(RED)
J623(1P)
W031(BLU)
J204(5P)
J502(7P)
J609(3P)
INPUT AMP
(VOLTAGE AMP.)
J625(1P)
W019
J607(2P)
J201(3P)
P501
J202(2P)
J205(4P)
J208(1P)
J203(2P)
P611
H POWER TR (POWER DRIVER)
J613(4P) J615(3P)
W021 W023 W025
J611(4P)
J619(3P)
J007
W013
W012
W011
J617(3P) J643(3P)
J621(3P)
BALANCED
J006
UN BAL 1
J005
UN BAL 1
INPUT
P991
POSISTER
W002
J871(2P)
P871
POWER SW
J902(4P)
LEVEL ON/OFF SW
(METER SW)
P971
L LED
J971(5P)
J904(2P)
W008
J951(4P)
P951
J952(5P)
W009
J961(5P)
P961
LEVELE METER
(& LED)
W035
J953(2P)
J901(7P)
W007
P981
R LED
J981(5P)
J903(2P)
W004
L002
CHOKE
COIL
J402(2P)
J808(4P)
J401(4P)
P221
MODE SEL
(INPUT SEL)
W028(RED)
L003
J602(5P)
J601(7P)
W030(BLU)
J624(1P)
J605(3P)
IDLING ADJ
J606(3P)
W018
P641
W017
J603(2P)
P601
MAIN AMP
(POWER BUFFER AMP.)
J604(2P)
W016
J612(4P) J608(2P)
J614(4P) J616(3P) J618(3P) J610(3P)
J626(1P)
J620(3P)
P621
N POWER TR (POWER DRIVER)
J620(3P)
W024 W022 W020
W034
J640(3P)
W991
J906(2P)
J905(7P)
J635(3P)
J636(3P)
W007
W026
W027
J008
J009
SPK 1
J010
J011
SPK 2
65
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