Marantz-SR7400-avr-sb1 维修电路原理图.pdf

Approved by S.NAGAO Written by WQ-19 2 817/additional rule 3 (1st Issue 2003-03-19)Date:5-Mar.-2004Model:SR5400,SR6400,SR7400Page:1 / 1REF.NBR:MZ04-019Circulation:Application:Subject:Int.ref:PHENOMENONIn 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 temperature10 to 19 degrees centigradeAmbient temperature20 to 30 degrees centigradeMeasurement Voltage Measurement Voltage 5 min.1.2 mV +- 0.3 mV2.0 mV +- 0.3 mV10 min.1.2 mV +- 0.3 mV2.1 mV +- 0.3 mV20 min1.4 mV +- 0.3 mV2.5 mV +- 0.3 mV30 min1.6 mV +- 0.3 mV2.7 mV +- 0.3 mV40 min1.7 mV +- 0.3 mV2.9 mV +- 0.3 mV50 min1.8 mV +- 0.3 mV3.1 mV +- 0.3 mV60 min.1.9 mV +- 0.3 mV3.2 mV +- 0.3 mVAfter Turning ONREMARKS-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 customercomplaint in case of servicemandatory.See belowRadioFans.CN 收音机爱 好者资料库