Technics-SUCH900-int-sch(1) 维修电路原理图.pdf

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1、RadioFans.CN 收音机爱 好者资料库RadioFans.CN 收音机爱 好者资料库TechInfo Sheet fax: 01344 853689Audio Visual email: av.technicalmail.panasonic.co.ukPanasonic CS U.K. Document No: 01 Model: SU-CH9001 Product Group: HiFi MiniModel: SU-CH900Date: 14/12/99Revision No: 01Document No: 01Subject: Unit Cuts OutSYMPTOM:The un

2、it turns off unexpectedly during normal operation and anindication of “E“ lights on the main display.CAUSE:One of the following may cause the cut out.1.A defective fan motor (coil shorted, disconnected or cloggedcommutator).2.A faulty detector circuit (short or disconnection).3.Smoothing capacitor (

3、C571) used in fault detector circuit ofoutput IC is possibly dry joint. The problem is liable to occurwhen the output is high.REMEDY:1.Defective fan motor: Replace the fan motor Part No. SYE1128-4unless the resistance across both ends of the coil is between 20and 30 Ohms.2.Incorrect action of fan motor circuit: Mount a capacitor acrossboth ends of the fan motor.3.Poorly soldered C571, re-solder this capacitor.NB Due to the nature of the problem, it is recommended that all of the three remedies above are carried out simultaneously