Marantz SR-7400 Sevice Bulletin

Date: 5-Mar.-2004 Model:

Page: 1 / 1 REF.NBR: MZ04-019

SERVICE BULLETIN

Circulation: Application:

Subject:

By idling, Top cover becomes very hot so that
it cannot touch by hand.

x for information customer

complaint in case of service
mandatory

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

See below

Int.ref:

[PHENOMENON]

In idling state, if time passes, the top cover becomes very hot.

[SOLUTION]

1) Idling adjustment is changed to the following contents.

A. The target setting voltage changes according to ambient temperature.
B. Adjustment time and Measurement Voltage after the Power ON are changed.

C. Adjustment is impossible when ambient temperature is 9 degrees centigrade or less.

SR5400,SR6400,SR7400

2) The setup of "Master Volume---Minimum, Speaker out---No load, and Top lid---OPEN" does not change.

3) Alignment Point and Measurement Point do not change.

4) Ignore 2 and 3 of Idling Current Alignment on the service manual (SR5400/SR6400 is 59 page and
SR7400 is 57 page).

Ambient temperature and Measurement Voltage of change are the following table.

After Turning ON

Ambient temperature

10 to 19 degrees centigrade

Ambient temperature

20 to 30 degrees centigrade

Measurement Voltage Measurement Voltage

5 min. 1.2 mV +-　0.3 mV 2.0 mV +-　0.3 mV

10 min. 1.2 mV +-　0.3 mV 2.1 mV +-　0.3 mV

20 min 1.4 mV +-　0.3 mV 2.5 mV +-　0.3 mV

30 min 1.6 mV +-　0.3 mV 2.7 mV +-　0.3 mV

40 min 1.7 mV +-　0.3 mV 2.9 mV +-　0.3 mV

50 min 1.8 mV +-　0.3 mV 3.1 mV +-　0.3 mV

60 min. 1.9 mV +-　0.3 mV 3.2 mV +-　0.3 mV

[REMARKS]

-The countermeasure apply to this claim only.

-With the Unit which has returned from the customer by repair, Please also readjust the following serial number.

This problem apply to following week code.

SR5400 / SR6400 / SR7400 apply to MZ020405xxxxxx.

This improvement has been done in the production the week code MZ020406xxxxxx and after.

Approved by S.NAGAO Written by

WQ-19 2 817

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

Date: 15-Mar.-2004 Model: SR7400

Page: 1 / 1 REF.NBR: MZ04-025

SERVICE BULLETIN

Circulation: Application:

x for information customer

See Below

Subject:

Can't decode input signal by the operation of
other company HDD RECORDER.

complaint in case of service
mandatory

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

Int.ref:

[PHENOMENON]

1) It occurs when Digital connection of HDD recorder (by Panasonic or Toshiba product).

2) The sound output of SR7400 is muted by HDD recorder operation.

[SOLUTION]

1) Update the CPU(IC28)’s software version to

2) Update the DSP(IC20)’s CODE ID 02 to

[ V040218_2x ]

[ CD02_02010116 ]

3) Please refer to the service manual SR7400
and “ 12.UPDATE FIRMWARE ”.

[NECESSARY PART]

Update of the firmware disc

*SR7400CD2

File name of

SR7400_Soft.zip

for CPU

page58 to 62, about details of “10.SERVICE MODE”

File name of

DSPROM_04_02_18.zip

for DSP

[REMARKS]

The countermeasure apply to this claim only

1) This problem apply to the following service change code.

SR7400/K1G/N1B/N1S /S1G/U1B apply to MZ02xxxxxxxxxx

This improvement has been done in the production the service change code

2) The model SR7400/L1G has improved from the top of mass production.

Approved by S.NAGAO Written by

WQ-19 2 817

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

MZ03

.

Date: 5-Mar.-2004 Model:

Page: 1 / 1 REF.NBR: MZ04-019

SERVICE BULLETIN

Circulation: Application:

Subject:

By idling, Top cover becomes very hot so that
it cannot touch by hand.

x for information customer

complaint in case of service
mandatory

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

See below

Int.ref:

[PHENOMENON]

In idling state, if time passes, the top cover becomes very hot.

[SOLUTION]

1) Idling adjustment is changed to the following contents.

A. The target setting voltage changes according to ambient temperature.
B. Adjustment time and Measurement Voltage after the Power ON are changed.

C. Adjustment is impossible when ambient temperature is 9 degrees centigrade or less.

SR5400,SR6400,SR7400

2) The setup of "Master Volume---Minimum, Speaker out---No load, and Top lid---OPEN" does not change.

3) Alignment Point and Measurement Point do not change.

4) Ignore 2 and 3 of Idling Current Alignment on the service manual (SR5400/SR6400 is 59 page and
SR7400 is 57 page).

Ambient temperature and Measurement Voltage of change are the following table.

After Turning ON

Ambient temperature

10 to 19 degrees centigrade

Ambient temperature

20 to 30 degrees centigrade

Measurement Voltage Measurement Voltage

5 min. 1.2 mV +-　0.3 mV 2.0 mV +-　0.3 mV

10 min. 1.2 mV +-　0.3 mV 2.1 mV +-　0.3 mV

20 min 1.4 mV +-　0.3 mV 2.5 mV +-　0.3 mV

30 min 1.6 mV +-　0.3 mV 2.7 mV +-　0.3 mV

40 min 1.7 mV +-　0.3 mV 2.9 mV +-　0.3 mV

50 min 1.8 mV +-　0.3 mV 3.1 mV +-　0.3 mV

60 min. 1.9 mV +-　0.3 mV 3.2 mV +-　0.3 mV

[REMARKS]

-The countermeasure apply to this claim only.

-With the Unit which has returned from the customer by repair, Please also readjust the following serial number.

This problem apply to following week code.

SR5400 / SR6400 / SR7400 apply to MZ020405xxxxxx.

This improvement has been done in the production the week code MZ020406xxxxxx and after.

Approved by S.NAGAO Written by

WQ-19 2 817

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