Marantz SR-7400-2 Sevice Bulletin

SERVICE BULLETIN

Level Application:

[PHENOMENON]

1. In condition, AC input is about 10% overvoltage than Rated voltage and the sound is not outputted for
a long time.

2. The DIODE (POS NO.D616) may short-circuit. R648 and R649 are broken by this short-circuit.

[SOLUTION]

1. POS.NO R649 RESISTOR (1.5K OHM) is changed to RESISTOR( 2.2K OHM) on the POWER PCB

[NECESSARY PART]

POS.NO. R649 nsp

[REMARKS]

1. The production of SR7400 / SR8400 has been finished.

2. SR7500/N1S: This improvement has been done in the production serial number MZ010450001274 and after.

3. SR7500/U1B: This improvement has been done in the production serial number MZ010450003001 and after.

4. SR8500/N1S: This improvement has been done in the production serial number MZ010450000430 and after.

5. SR8500/N1B: This improvement has been done in the production serial number MZ010450000001 and after.

6. SR8500/U1B: This improvement has been done in the production serial number MZ010449000796 and after.

1.5 K ohm

(RESISTOR 2.2K OHM 1WJ ) Factory code number KRG1SANJ222RT

See below

Date: 28-Dec-2004 Model: SR7400/SR7500/SR8500

Page: 1 / 1 REF.NBR: MZ04-085

Subject:

Int.ref:

FL Display does not light up.

2.2 K ohm

SR7400 / SR7500 / SR8500 Service Bulletin REF.NBR: MZ04-085 page 2/3

Approved by N.Sensui Written by S.NAGAO

WQ-19 2 817

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

R648 2.2K ohm

D616 Zener Diode part no. 90M-HD302190R

SR7400

R649 1.5K ohm

R648 2.2K ohm

SR7400 / SR7500 / SR8500 Service Bulletin REF.NBR: MZ04-085 page 3/3

SR7500 / SR8500

R649 1.5K ohm

D616 Zener Diode part no. 90M-HD302190R

Approved by N.Sensui Written by S.NAGAO

WQ-19 2 817

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