Marantz MM7055/N1B, MM7055/U1B, MM7055/K1B Service Manual

Service

MM7055 /

N1B/U1B/K1B

d

Manual

5 Channel Power Amplier

For purposes of improvement, specications and design are subject to change without notice.

•

Please use this service manual with referring to the operating instructions without fail.

•

Some illustrations using in this service manual are slightly different from the actual set.

•

MM7055

S0322-0V04M/DG1108

Copyright 2011 D&M Holdings Inc. All rights reserved.

WARNING: Violators will be prosecuted to the maximum extent possible.

Ver. 4

Please refer to the

MODIFICATION NOTICE.

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

company has created the ultimate in stereo sound.

which 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

100 CORPORATE DRIVE
MAHWAH, NEW JERSEY 07430
USA

JAPAN

D&M Holdings Inc.

D&M BUILDING, 2-1 NISSHIN-CHO,
KAWASAKI-KU, KAWASAKI-SHI,
KANAGAWA, 210-8569 JAPAN

EUROPE / TRADING

D&M EUROPE B. V.

P. O. BOX 8744, BUILDING SILVERPOINT
BEEMDSTRAAT 11, 5653 MA EINDHOVEN
THE NETHERLANDS
PHONE : +31 - 40 - 2507844
FAX : +31 - 40 - 2507860

CANADA

D&M Canada Inc.

5-505 APPLE CREEK BLVD.
MARKHAM, ONTARIO L3R 5B1
CANADA
PHONE : 905 - 415 - 9292
FAX : 905 - 475 - 4159

KOREA

D&M SALES AND MARKETING KOREA LTD.

2F,YEON BLDG.,
88-5, BANPO-DONG, SEOCHO-GU,
SEOUL KOREA
PHONE : +82 - 2 - 715 - 9041
FAX : +82 - 2 - 715 - 9040

CHINA

D&M SALES AND MARKETING SHANGHAI LTD.

ROOM.808 SHANGHAI AIRPORT CITY TERMINAL
NO.1600 NANJING (WEST) ROAD, SHANGHAI,
CHINA. 200040
TEL : 021 - 6248 - 5151
FAX : 021 - 6248 - 4434

NOTE ON SAFETY :

Symbol z Fire or electrical shock hazard. Only original parts should be used to replaced any part marked with symbol z .

Any other component substitution (other than original type), may increase risk of fi re or electrical shock hazard.

安全上の注意：

zがついている部品は、安全上重要な部品です。必ず指定されている部品番号の部品を使用して下さい。

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 verifi ed before it is return to the user/customer.
Ref. UL Standard No. 60065.

In case of diffi culties, do not hesitate to contact the Technical

Department at above mentioned address.

2

091105DM/DG

SAFETY PRECAUTIONS

The following check should be performed for the continued protection of the customer and service technician.

LEAKAGE CURRENT CHECK

Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis
resistance check. if the leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either side of the
power cord is less than 460 kohms, the unit is defective.
Be sure to test for leakage current with the AC plug in both polarities, in addition, in each power ON, OFF and STANDBY
mode, if applicable.

CAUTION

Please heed the points listed below during servicing and inspection.

◎Heed the cautions!

Spots requiring particular attention when servicing, such
as the cabinet, parts, chassis,etc., have cautions indicated
on labels. be sure to heed these causions and the
cautions indicated in the handling instructions.

◎Caution concerning electric shock!

(1) An AC voltage is impressed on this set, so touching

internal metal parts when the set is energized could
cause electric shock. Take care to avoid electric
shock, by for example using an isolating transformer
and gloves when servicing while the set is energized,
unplugging the power cord when replacing parts, etc.

(2) Tere are high voltage parts inside. Handle with extra

care when the set is energized.

◎ Caution concerning disassembly and

assembly!

Through great care is taken when manufacturing parts
from sheet metal, there may in some rare cases be burrs
on the edges of parts which could cause injury if fi ngers
are moved across them. Use gloves to protect your hands.

◎Only use designated parts!

The set's parts have specific safety properties (fire
resistance, voltage resistance, etc.). For replacement
parts, be sure to use parts which have the same
poroperties. In particular, for the important safety parts
that are marked z on wiring diagrams and parts lists, be
sure to use the designated parts.

◎ Be sure to mount parts and arrange the wires

as they were originally!

For safety seasons, some parts use tape, tubes or other
insulating materials, and some parts are mounted away
from the surface of printed circuit boards. Care is also
taken with the positions of the wores omsode amd clamps
are used to keep wires away from heating and high
voltage parts, so be sure to set everything back as it was
originally.

◎Inspect for safety after servicing!

Check that all screws, parts and wires removed or
disconnected for servicing have been put back in their
original positions, inspect that no parts around the area
that has been serviced have been negatively affected,
conduct an inslation check on the external metal
connectors and between the blades of the power plug,
and otherwise check that safety is ensured.

(Insulation check procedure)
Unplug the power cord from the power outlet, disconnect
the antenna, plugs, etc., and turn the power switch on.
Using a 500V insulation resistance tester, check that the
inplug and the externally exposed metal parts (antenna
terminal, headphones terminal, input terminal, etc.) is
1MΩ or greater. If it is less, the set must be inspected and
repaired.

CAUTION

Concerning important safety

parts

Many of the electric and structural parts used in the set
have special safety properties. In most cases these
properties are difficult to distinguish by sight, and using
replacement parts with higher ratings (rated power and
withstand voltage) does not necessarily guarantee that
safety performance will be poreserved. Parts with safety
properties are indicated as shown below on the wiring
diagrams and parts lists is this service manual. Be sure to
replace them with parts with the designated part number.

(1) Schematic diagrams ......Indicated by the z mark.

(2) Parts lists ......Indicated by the z mark.

Using parts other than the designated
parts could result in electric shock, fi res
or other dangerous situations.

3

NOTE FOR SCHEMATIC DIAGRAM

WARNING:

Parts marked with this symbol z have critical characteristics. Use ONLY replacement parts recommended by the manufacture

CAUTION:

Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis resistance check. If the
leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either side of the power cord is less than 460 kohms, the unit is defective.

WARNING:

DO NOT return the unit to the customer until the problem is located and corrected.

NOTICE:

ALL RESISTANCE VALUES IN OHM. k=1,000 OHM / M=1,000,000 OHM
ALL CAPACITANCE VALUES IN MICRO FARAD. P=MICRO-MICRO FARAD EACH VOLTAGE AND CURRENT ARE MEASURED AT NO SIGNAL
INPUT CONDITION. CIRCUIT AND PARTS ARE SUBJECT TO CHANGE WITHOUT PRIOR NOTICE.

r.

NOTE FOR PARTS LIST

PARTS INFORMATION

RESISTORS

1) 00MGD05

2) 00MGD05

Examples ;



0.5Ω .....005 18Ω ..... 180 2.7kΩ ..... 272 680kΩ ..... 684

1Ω .....010 100Ω ..... 101 10kΩ ..... 103 1MΩ ..... 105

6.8Ω .....068 390Ω ..... 391 22kΩ ..... 223 4.7MΩ ..... 475

Note : Please distinguish 1/4W from 1/6W by the shape of parts

CAPACITORS

CERAMIC CAP.

3) 00MDD1 × × × × 370, Ceramic capacitor

Examples ;

±0.25pF...... 0

±0.5pF...... 1

±5%...... 5

Tolerance of COMMON PARTS handled here are as follows :

0.5pF〜 5pF .....±0.25pF

6pF〜 10pF .....±0.5pF

12pF〜 560pF .....±5%

0.5pF .....005 3pF .....030 100pF ..... 101

1pF .....010 10pF .....100 220pF ..... 221

1.5pF .....015 47pF ..... 470 560pF .....561

ERAMIC CAP.

C

4) 00MDK16

Examples ;



100pF .....101 1000pF ..... 102 10000pF .....103

470pF .....471 2200pF ..... 222

ELECTROLY CAP. ( )

5) 00MEA

Examples ;

0.1μF .....104 4.7μF .....475 100μF ... 107

0.33μF .....334 10μF .....106 330μF ... 337

1μF ..... 105 22μF ..... 226 1100μF ... 118

2200μF ... 228

6.3V .....006 25V ..... 025

10V .....010 35V .....035

16V .....016 50V .....050

FILM CAP. ( )

6) 00MDF15
00MDF15
00MDF16

Examples ;

0.001μF (1000pF) ...........102 0.1μF .... 104

0.0018μF ...........................182 0.56μF .... 564

0.01μF ...........................103 1μF .... 105

0.015μF ...........................153

× × ×

140, Carbon fi lm fi xed resistor, ±5% 1/4W

× × ×

160, Carbon fi lm fi xed resistor, ±5% 1/6W

}

Resistance value



Resistance value

0.1Ω .....001 10Ω ..... 100 1kΩ ..... 102 100kΩ ..... 104

used actually.

}

Disc type

 

Temp.coeff.P350〜N1000, 50V

Tolerance (Capacity deviation)



Capacity value



}

× × ×

capacitor



Disc type
Temp.chara. 2B4, 50V

Capacity value

× × × × × ×

}

One-way lead type, Tolerance ±20%

 

Capacity value



Working voltage



× × ×
× × ×
× × ×

}

One-way type, Mylar ±10% 50V



Capacity value



Capacity value
Tolerance

300, High dielectric constant ceramic

Capacity value

10, Electrolytic capacitor

}

Working voltage
Capacity value

350 Plastic fi lm capacitor
310 One-way type, Mylar ±5% 50V
310 Plastic fi lm capacitor

▲

▲

Capacity value

NOTE ON SAFETY FOR FUSIBLE RESISTOR :

The suppliers and their type numbers of fusible resistors
are as follows;

1. KOA Corporation
Part No. (MJI) Type No. (KOA) Description
00MNH05 × × × 140 RF25S × × × × ΩJ (±5% 1/4W)
00MNH05 × × × 120 RF50S × × × × ΩJ (±5% 1/2W)
00MNH85 × × × 110 RF73B2A × × × × ΩJ (±5% 1/10W)
00MNH95 × × × 140 RF73B2E × × × × ΩJ (±5% 1/4W

2. Matsushita Electronic Components Co., Ltd
Part No. (MJI) Type No. (MEC) Description
00MNF05 × × × 140 ERD-2FCJ × × × (±5% 1/4W)
00MRF05 × × × 140
00MNF02 × × × 140
00MRF02 × × × 140

Examples ;

0.1Ω .....001 10Ω ..... 100 1kΩ ..... 102 100kΩ .... 104

0.5Ω .....005 18Ω ..... 180 2.7kΩ ..... 272 680kΩ .... 684

1Ω .....010 100Ω ..... 101 10kΩ ..... 103 1MΩ .... 105

6.8Ω .....068 390Ω ..... 391 22kΩ ..... 223 4.7MΩ .... 475

}

}

Resistance value

*

▲▲

▲ ▲

Resistance value

▲

▲

ERD-2FCG

Resistance value

}

Resistance value
(0.1 − 10kΩ)

}

× × × (±2% 1/4W)

Resistance value

ABBREVIA TION AND MARKS

ANT. : ANTENNA BATT. : BATTERY

CAP. : CAPACITOR CER. : CERAMIC

CONN. : CONNECTING DIG. : DIGITAL

HP : HEADPHONE MIC. : MICROPHONE

μ-PRO : MICROPROCESSOR REC. : RECORDING

RES. : RESISTOR SPK : SPEAKER

SW : SWITCH

TRIM. : TRIMMING TRS. : TRAMSISTOR

VAR. : VARIABLE X’TAL : CRYSTAL

TRANSF.

: TRANSFORMER

NOTE ON FUSE :

Regarding to all parts of parts code 00MFS20xxx2xx, replace

only with Wickmann-Werke GmbH, Type 372 non glass type fuse.

NOTE ON SAFETY :

Symbol z Fire or electrical shock hazard. Only original parts
should be used to replaced any part marked with symbol z.

Any other component substitution (other than original type), may

increase risk of fi re or electrical shock hazard.

安全上の注意:

z がついている部品は、安全上重要な部品です。必ず指定
されている部品番号の部品を使用して下さい。

060522 MZ

4

)

TECHNICAL SPECIFICATIONS

n MM7055

Rated power output

(from 20 Hz to 20 kHz/THD = 0.08 %,
two channels driven):

Maximum effective output power
(from 1 kHz, two channels driven):

Output bandwidth (8 Ω load, 0.09 %): 5 Hz – 40 kHz
Frequency response (1 W, 8 Ω): 8 Hz – 100 kHz (±3 dB)
Damping factor: 100
Input sensitivity/impedance: 1.2 V / 22 kΩ (UNBALANCED)

Signal-to-noise ratio (IHF-A): 105 dB
Voltage amplifi cation level: 29 dB
Supply voltage (for U1B): AC 120 V, 60 Hz
Supply voltage (for N1B): AC 230 V, 50 Hz
Power consumption: 660 W
Standby power: 0.2 W
Maximum external dimensions: 440 (W) x 183 (H) x 384 (D) mm
Weight: 15.7 kg

DIMENSION

140 W/ch, 8 Ω
170 W/ch, 6 Ω

210 W/ch, 6 Ω

2.4 V / 30 kΩ (BALANCED)

21.5

440

362

170

384

183

13

5

DISASSEMBLY

• Disassemble in order of the arrow of the fi gure of following fl ow.

• In the case of the re-assembling, assemble it in order of the reverse of the following fl ow.

• In the case of the re-assembling, observe "attention of assembling" it.

• If wire bundles are untied or moved to perform adjustment or parts replacement etc., be sure to rearrange them neatly
as they were originally bundled or placed afterward.
Otherwise, incorrect arrangement can be a cause of noise generation.

TOP COVER

FRONT PANEL ASSY

Refer to "DISASSEMBLY

1. FRONT PANEL ASSY"

and "EXPLODED VIEW"

FRONT PCB ASS'Y-1

(Ref. No. of EXPLODED VIEW : C1)

FRONT PCB ASS'Y-2

(Ref. No. of EXPLODED VIEW : C2)

FRONT PCB ASS'Y-3

(Ref. No. of EXPLODED VIEW : C10)

STBY .PCB ASS'Y-2

Refer to "DISASSEMBLY

4. STBY.PCB ASS'Y-2"

and "EXPLODED VIEW"

STBY .PCB ASS'Y-2

(Ref. No. of EXPLODED VIEW : C6)

CPU PCB ASS'Y

Refer to "DISASSEMBLY

2. CPU PCB ASS'Y"

and "EXPLODED VIEW"

CPU PCB ASS'Y

(Ref. No. of EXPLODED VIEW : C7)

TRANS

Refer to "DISASSEMBLY

3. TRANS"

and "EXPLODED VIEW"

TRANS

(Ref. No. of EXPLODED VIEW : C5)

AMP UNIT

Refer to "DISASSEMBLY

8. AMP UNIT"

and "EXPLODED VIEW"

AMP PCB ASS'Y-1

(Ref. No. of EXPLODED VIEW : C11)

AMP PCB ASS'Y-2

(Ref. No. of EXPLODED VIEW : C12)

INPUT PCB-2

Refer to "DISASSEMBLY

5. INPUT PCB-2"

and "EXPLODED VIEW"

INPUT PCB-2

(Ref. No. of EXPLODED VIEW : C15)

INPUT PCB-1

Refer to "DISASSEMBLY

6. INPUT PCB-1"

and "EXPLODED VIEW"

INPUT PCB-1

(Ref. No. of EXPLODED VIEW : C14)

POWER PCB ASSY

Refer to "DISASSEMBLY

7. POWER PCB ASSY"

and "EXPLODED VIEW"

POWER PCB ASSY

(Ref. No. of EXPLODED VIEW : C17)

6

About the photos used for descriptions in the DISASSEMBLY" section.

• The direction from which the photographs used herein were photographed is indicated at "Direction of photograph: ***"
at the left of the respective photographs.

• Refer to the table below for a description of the direction in which the photos were taken.

• Photographs for which no direction is indicated were taken from above the product.

The viewpoint of each photograph
(Photografy direction)

［View from above］

Direction of photograph: C

1. FRONT PANEL ASSY

Direction of photograph: B

Front side

Direction of photograph: D

Direction of photograph: A

Proceeding :

Please refer to "EXPLODED VIEW" for the disassembly method of each PCB included in FRONT PANEL ASSY and
FRONT PANEL ASSY.

TOP COVER

FRONT PANEL ASSY

→

2. CPU PCB ASS'Y

Proceeding :

Please refer to "EXPLODED VIEW" for the disassembly method of CPU PCB ASS'Y.

TOP COVER

CPU PCB ASS'Y

→

3. TRANS

Proceeding :

Please refer to "EXPLODED VIEW" for the disassembly method of TRANS.

TOP COVER

CPU PCB ASS'Y

→

→

TRANS

4. STBY.PCB ASS'Y-2

Proceeding :

Please refer to "EXPLODED VIEW" for the disassembly method of STBY.PCB ASS'Y-2.

TOP COVER

STBY.PCB ASS'Y-2

→

7

5. INPUT PCB-2

Proceeding :

(1) Disconnect the connector wire.

(2) Remove the screws.

TOP COVER

Direction of photograph: A

INPUT PCB-2

→

CN52

8

6. INPUT PCB-1

Proceeding :

(1) Disconnect the connector wire.

(2) Remove the screws.

TOP COVER

INPUT PCB-2

→

INPUT PCB-1

→

BN51

Direction of photograph: A

7. POWER PCB ASSY

Proceeding :

Please refer to "EXPLODED VIEW" for the disassembly method of POWER PCB ASS'Y.

TOP COVER

INPUT PCB-2

→

INPUT PCB-1

→

POWER PCB ASS'Y

→

9

8. AMP UNIT

Proceeding :

(1) Remove the screws.

View from bottom

TOP COVER

INPUT PCB-2

→

INPUT PCB-1

→

AMP UNIT

→

(2) Remove the screws.

Direction of photograph: C

10

(3) Disconnect the connector wires, then remove the screws.

CN21

CN31

CN21

BN41

CN15,CN16,CN17,CN18,CN19

(4) Disconnect the connector wire.

CN13

Please refer to "EXPLODED VIEW" for the disassembly method of each PCB included in AMP UNIT.

11

SPECIAL MODE

Special mode setting button

Enters the special mode when A button is pressed in normal power state.

b

No. Mode Button A Contents

1 Service mode Service

1-1 Protection Log display Service Displayed protection history.

1-2 Exit from protection state

2

Factory mode Factory

2-1

AVSS output checking mode Factory AVSS, H/L check mode

Destination Switching

2-2

checking mode

2-3 Auto standby confi rm mode.

2-4 Initialize mode

s

CPU version displayed.

and

Furthermore,this unit in a condition of the following by pushing the Button A.

Service

(Hold button more

than 5 seconds.)

Display Display and changing destination.

Display

+

ON/STANDBY

ON/STANDBY

Displayed protection history and move to normal mode.

Cooling FAN actived .

and

Furthermore,this unit in a condition of the following by pushing the Button A.

Go to standby mode condition with after 15 seconds.

• no signal

• no operation

• no command (RC)

Initialize

V3

(D405)V2(D406)V1(D407)

CPU Version / Protection Log

Indication LED

FACTORY

botton

(SW401)

SERVICE

botton

(SW402)

12

1. CPU Version check

The fi rmware version is displayed on LEDs as follows.

V1(D407) V2(D406) V3(D405) Version

ON OFF OFF Ver1

OFF ON OFF Ver2

ON ON OFF Ver3

OFF OFF ON Ver4

ON OFF ON Ver5

OFF ON ON Ver6

ON ON ON Ver7

1.1. Protection Log display

The last time protection log is displayed on LEDs as follows if the Service button is pushed(>5sec) in the Service
mode. For detail and coping process, please refer to “SYSTEM ERROR”.

V1(D407) V2(D406) V3(D405) Cause of protect

OFF OFF OFF No protection log
OFF OFF ON Detection of over current over 200msec on Power AMP
OFF ON OFF Detection of DC on Power Amp output
OFF ON ON -

ON OFF OFF

ON OFF ON
ON ON OFF Detection of abnormal heat of Power Amp

ON ON ON -

Detection of over current below 200msec on Power
Amp

Detection of abnormality on +/-38V, +/-15V supply
or power amp supply

13

2. Cooling FAN active

The fan rotates according to the condition of the temperature sensor(IC406,407,408) as follows.

T :IC406,407 and 408 temperature Fan rotate

T < 0°C STOP

0°C ≦ T < 10°C Rotate Low speed

10°C ≦ T Rotate High speed

2.1. AVSS H/L Switching

The AVSS relay High/Low switching cyclic if the Factory button is pushed in the factory mode.
If not changing, there is an error in the AVSS relay circuit (RY14,15 on Power pcb).
This is effective only in factory mode.

2.2. Destination Switching

The destination changes cyclic if the DISPLAY button is pushed for fi ve seconds in the factory mode.
For confi rmation, The Auto Standby LED lights as follows.
The difference by destination is only a Auto Standby function.

Destination Auto standby function

N (Europe) Enable Lights

Others (NA/Japan) Disable Blinking 500msec interval

Auto standby LED

(factory mode only)

2.3. Auto Standby Function confi rm mode

When press DISPLAY button(fi rst) + ON/STANDBY button(second) together, enters Auto Standby Function confi rm
mode.
From this state, if there is no audio input/operation/command for 15 seconds, changes in the state of the standby.
If not changing, there is an error in the auto standby detect circuit (IC510,511,512 on Bal input pcb).

2.4. Initialize

Initializes following setting if the ON/STANDBY button is pushed in the factory mode.

Contents After initialized

Auto Standby Mode Not change

Illumination LED On/Off On

Protection log No protection log

14

3. SYSTEM ERROR

The reason for the error can be presumed from Standby LED display when the error occurs and protection log display.
Refer to [1-1.] for the method of confi rming protection log.
If the AC power supply is turned off, the state of all protection can be released.

Protection log

Error Detection

display

V1

D407V2D406V3D405

Reason Check Point

Detection of abnormality on +/-38V, +/­15V supply or power amp supply
(_P LINE FAIL)

Connection

POWER PWB : BN12- 4pin
CPU PWB : CN41 - 4pin

Standby LED Blinking
125msec interval
(Fast Blinking)

Standby LED Blinking
500msec interval
(Slow Blinking)

ON OFF ON

CPU (IC402) 45pin _P LINE FAIL :
0V : Fail 5V : Normality
There is a possibility that ± 38 V supply or
P-AMP power supply is broken.

Detection of over current over 200msec
on Power AMP
(_P CUR FAIL)

OFF OFF ON

CPU (IC402) 38pin _P CUR FAIL :
0V : Fail 5V : Normality
There is a possibility that Power AMP is
broken.

Detection of over current below 200msec
on Power Amp
(_P CUR FAIL)

ON OFF OFF

CPU (IC402) 38pin _P CUR FAIL :
0V : Fail 5V : Normality

Detection of DC on Power Amp output
(_P AMP FAIL) Connection

OFF ON OFF

Main-CPU (IC402) 41pin _P AMP FAIL :
0V : Fail 5V : Normality

Detection of abnormal heat of Power Amp
(_HEAT DET P) Connection

ON ON OFF

Main-CPU (IC402) 24pin
0V : Fail 5V : Normality

OFF OFF OFF No protection log

Power Amp
Supply Power

Connection

Power Amp

Connection

Power Amp

Power Amp

Posistor TH91,TH92

POWER PWB :
IC13,IC14,D109,RY14,RY15
,F101,F102,D110-D113

AMP PWB : CN95 - 4pin,
CN94-8pin

CPU PWB :BN41 - 8pin.

Check Power AMP circuit
(AMP PWB)

AMP PWB : CN95 - 4pin,
CN94-8pin

CPU PWB :BN41 - 8pin.
Check Power AMP circuit

(AMP PWB)
AMP PWB :CN95 - 5pin,

CN94-9pin
CPU PWB : BN41 - 9pin

Check Power AMP circuit
(AMP PWB)

AMP PWB : CN94 - 10pin
CPU PWB : BN41 - 10pin

15

VERSION UPGRADE PROCEDURE OF FIRMWARE

ABOUT REPLACE THE MICROPROCESSOR WITH A NEW ONE

When replaced of the U-PRO (Microprocessor), confi rm contents of the following.

PWB Name Ref. No. Description

12336Z-A IC402

After replaced

A : Mask ROM (With software). No need write-in of software to the microprocessor.
B : Flash ROM (With software). Usually, no need write-in of software. But, when the software was updated, you should

be write-in of the new software to the microprocessor or fl ash ROM. Please check the software version.

C : Empty Flash ROM (Without software). You should be write-in of the software to the microprocessor.

Refer to “Update procedure” or “writing procedure”, when you should be write-in the software.

R5F21246SNFP C

[A] Update CPU's software to internal Flash-ROM.

• This mode is to update the software for microprocessor.

• The target devise is internal fl ash ROM of microprocessor (IC402) on CPU PWB (12336Z-A).

• The updating of software takes about 20 seconds.

• The software is common by MM7055 and MM7025.

Necessary Equipment

The following items are required for updating.

• Windows PC (OS: Windows2000 or WindowsXP) with Serial port.

• RS-232C Dsub-9 pin cable (female to female/straight type)

• Update software to CPU. (FlashSta.exe, MM7055_7025_yymmddvv.mot and MM7055_7025_yymmddvv.id in CPU
(MM7055_7025) folder)

• DATA UPDATE KIT (part no. 90M-SR4500JIG)
Use DATA UPDATE KIT to connect PC and CN44 (FFC connector) in rear panel of the unit, when updating CPU

After

replaced

Remark

Update CPU’s software to internal Flash-ROM

(1) Disconnect the mains cord from the unit
(2) Connect PC and the DATA UPDATE KIT with the RS-232C cable. And connect FFC (upside contact) to the connector

(CN44) into the rear panel of the unit from the DATA UPDATE KIT.

(3) Connect the mains cord into the unit.
(4) Press the POWER ON/OFF button for turn on the unit. Then the STANDBY LED do not turn on a light.
(5) Put the CPU (MM7055_7025) folder into anywhere on your PC’s hard disc.

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(6) Double click the CPU (MM7055_7025) folder.

(7) Double click the FlashSta.exe. And launch the M16C Flash Start.

(8) Check the internal fl ash memory in the Select Program.

Choose the COM Port number. And the click OK.

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(9) Click the Refer....

(10) Choose the MM7055_7025_yymmddvv.mot. And click Open.

NOTE : The yy is two digit of year. The mm is month. The dd is date. The vv is version.

(11) The FilePath and ID are inputted automatically, and the MCU Type is selected to R8C automatically.

Click the OK.

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(12) Click the Setting....

(13) Choose the 57600 in the Baud rate. (DO NOT choose the other one.)

Choose the 40 in Program_intervals(ms). Click the OK.

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(14) Click the E.P.R....

(15) Click the OK.

(16) Software is written into the internal Flash-ROM of CPU.

The updating of software takes about 20 seconds.

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(17) Click the OK.

(18) Click the Exit.

(19) Disconnect the mains cord from the unit.
(20) Disconnect the RS-232C cable from the unit.

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ADJUSTMENT

Idling Current Alignment

(1) Each of the measurement points are provided with the two test points. Set a digital Voltage meter to DC voltage

input, connect the meter to the test points at both contact points.
(2) After the setup above, turn on the main switch.
(3) Adjust variable resistors (VR11 - VR31) according to the digital voltmeter readings. The target setting value is the

following table for each channel.

Settings : No-signal of input

Speaker out — No Load

Top lid — OPEN

Measurement Point

AMP PWB Channel Adjustment VR Measurement Point

Front side

AMP PWB

Rear side

AMP PWB

Time Table of Idling Current Rise

After Turning ON

10 min. 1.5 mV ± 0.2 mV
20 min. 1.5 mV ± 0.2 mV
30 min. 1.5 mV ± 0.2 mV

SL (CHANNEL 3) VR21 CN22
SR (CHANNEL 4) VR31 CN32

C (CHANNEL 5) VR11 CN12
FL (CHANNEL 1) VR31 CN32
FR (CHANNEL 2) VR21 CN22

Ambient temperature

20 to 30 degrees centigrade

Measurement Voltage

FAN

SL

(CHANNEL 3)

VR21
CN22

FL

(CHANNEL 1)

VR31
CN32

POWER AMP MODULE

(CHANNEL 2)

REAR SIDE

MAIN HEAT SINK

FRONT SIDE

SR

(CHANNEL 4)

VR31
CN32

FR

VR21
CN22

C

(CHANNEL 5)

VR11
CN12

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