Marantz SR 4400 Service Bulletin
This is the 5 pages manual for Marantz SR 4400 Service Bulletin.
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Extracted text from Marantz SR 4400 Service Bulletin (Ocr-read)
Page 1
Approved by S.NAGAO Written by WQ-19 2 817 /additional rule 3 (1st Issue 2003-03-19) Date: 31-Oct.-2003 Model: SR4300/SR4400 Page: 1 / 3 REF.NBR: MZ03-047 Circulation: Application: Subject: 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. SERVICE BULLETIN The problem of the Speaker protection circuit. x for information customer complaint in case of service mandatory ................... Service code XE00 XE00xxxxxxxxxx
Page 2
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. *HD201810R Caution JFS08 (FPC CONNECTOR) side is CATHODE DIGITAL/AUDIO PCB No.5 pin of JFN101 BASE of QN606 Adhesives : SC608LVZ (Sony Chemical Corp. – Self-extinguishing adhesive) or the equivalent Insulation tube is used MAIN PCB DN601 Part no. HD20002000 CATHODE MARK