Marantz SR 6400 Service Bulletin

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Approved by S.NAGAO Written by WQ-19 2 817 /additional rule 3 (1st Issue 2003-03-19) Date: 5-Mar.-2004 Model: SR5400,SR6400,SR7400 Page: 1 / 1 REF.NBR: MZ04-019 Circulation: Application: Subject: 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. 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. Ambient temperature 10 to 19 degrees centigradeAmbient 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 After Turning ON [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. SERVICE BULLETIN 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