Marantz SR-4300 Sevice Bulletin

Date: 31-Oct.-2003 Model: SR4300/SR4400

Page: 1 / 3 REF.NBR: MZ03-047

SERVICE BULLETIN

Circulation: Application:

Subject:

The problem of the Speaker protection circuit.

x for information customer

Service code XE00

complaint in case of service
mandatory

...................

XE00xxxxxxxxxx

Int.ref:

[PHENOMENON]

1) The protection circuit does not work when the power transistor was damaged.

2) When the power transistor was damaged, about 40 V outputs to speaker out.

3) The protection circuit function does not operate, then the unit will not be in POWER STANDBY mode
and the speaker output RELAY does not work.

[REASON]

1) When the transistor is damaged before turn on the unit, the micro processor can not detect protection
signal (Protect2).

2) Turn on the unit, the down edge of a protection signal (Protect2) is undetectable for about 2 seconds
after the micro processor reset

[SOLUTION]

The protection output signal of Protection IC is added to the "SPK MUTE" signal in hard, and
Speaker MUTE is always set to “ON” when abnormal occur protection

1.SR4300

DIGITAL/AUDIO PCB

1) Chip Resistor

LS850

(100 ohm 1/16W part no. NN05101610 ) is changed to

Silicon Diode

(Part no. *HD201810R--- 1SS400 POHM: EMD2, EIAJ: SC-79, JEDEC: SOD-523 ).

MAIN PCB

2) Chip Resistor

DN601(Part no.HD20002000---Silicon Diode 1SS254 ROHM)

is added between

BASE of QN606 SEMICOM.COMP and No.5 pin of JFN101 Connector

2.SR4400

DIGITAL/AUDIO PCB

1) Chip Resistor

RS928

(100 ohm 1/16W part no. NN05101610 ) is changed to

Silicon Diode

(Part no. *HD201810R--- 1SS400 POHM: EMD2, EIAJ: SC-79, JEDEC: SOD-523 ).

MAIN PCB

2) Chip Resistor

DN601(Part no.HD20002000---Silicon Diode 1SS254 ROHM)

is added between

BASE of QN606 SEMICOM.COMP and No.5 pin of JFN101 Connector

As for the details, Please see page2/3 and 3/3

[REMARKS]

The countermeasure apply to this claim only.
This problem apply to the Service code number XE00xxxxxxxxxx.
This improvement has been done in the production the Service code number XE01xxxxxxxxx and after.

Approved by S.NAGAO Written by

WQ-19 2 817

/additional rule 3 (1st Issue 2003-03-19)

SR4300/SR4400 SERVICE BULLETIN (REF.NBR:MZ03-047) page2/3

SR4300

LS850 is changed to
Part no.

Caution

JFS08 (FPC CONNECTOR) side is
CATHODE

*HD201810R

DIGITAL/AUDIO PCB

CATHODE MARK

BASE of QN606

Adhesives:

SC608LVZ (Sony Chemical Corp. – Self-extinguishing adhesive) or the equivalent

MAIN PCB

No.5 pin of JFN101

DN601
Part no. HD20002000

Insulation tube is used

Approved by S.NAGAO Written by

WQ-19 2 817

/additional rule 3 (1st Issue 2003-03-19)

SR4300/SR4400 SERVICE BULLETIN (REF.NBR:MZ03-047) page3/3

SR4400

RS928 is changed to

Part no.

Caution

JFS08 (FPC CONNECTOR) side is
CATHODE

*HD201810R

BASE of QN606

CATHODE MARK

DIGITAL/AUDIO PCB

Adhesives:

SC608LVZ (Sony Chemical Corp. – Self-extinguishing adhesive) or the equivalent

MAIN PCB

DN601
Part no. HD20002000

Approved by S.NAGAO Written by

WQ-19 2 817

Insulation tube is used

No.5 pin of JFN101

/additional rule 3 (1st Issue 2003-03-19)

Date: 30-June-2003 Model: SR4300,SR4400

Page: 1 / 1 REF.NBR: MZ03-025

SERVICE BULLETIN

Circulation: Application:

Subject:

FM(with RDS) signal is received, Frequency
Indication becomes the setup of default

x for information customer

complaint in case of service
mandatory

...................

See Below

by the remote control operation .
(only N and A version occurs)

Int.ref:

[PHENOMENON]

The problem occurs in the following operation.

1. First, RDS(Radio Data System) in the FM signal is received.

2. Then preset memory newly.

3. Then press the POWER button on the remote controller , the unit became Standby mode.

4. Again, press the POWER button on the remote controller, the volume level becomes “ -∞ ” and
Frequency indication becomes the setup of default.
(This problem occurs only SR4300/N1B/N1G/A1B/A1G and SR4400/N1B/N1S/A1B/A1S)

[SOLUTION]

Replace MICRO PROCESSOR(Flash)

ICS18

on the

DIGITAL/AUDIO PCB

.

[NECESSARY PART]

1. SR4300

POS.NO

(H8/3026F Flash Ver.030527 wrote FACTORY PART No.

ICS18 Part no. *HS09AWH0R New version no: VER .030527

OICH83026F43SV0527

[OLD part no. *HU100620R FACTORY PART No. OICH83026F]

2. SR4400

POS.NO

(HD6433026D04F Mask Ver.030515 FACTORY PART No.

ICS18 Part no. *HS26AWH0R New version no: VER .030515

OICHD6433026D04F

[OLD part no. *HU100620R FACTORY PART No. OICH83026F]

Version no can be confirmed with SERVICE MODE, Refer to service manual of SR4300 page56 or
SR4400 page52.

)

)

[REMARKS]

1. The countermeasure apply to this claim only.

2. This improvement has been done in the production the serial no.XE000322xxxxxx and after (SR4400)

3. The production of SR4300/N1B/N1G/A1B/A1G has been finished.

Approved by S.NAGAO Written by

WQ-19 2 817

/additional rule 3 (1st Issue 2003-03-19)