Labels:book | monitor | reckoner | sky OCR: KENWOOD SB-991 SERVICE BULLETIN Amateur Radio Division SUBJECT DATE TS-950S Rear Panel Cooling Fan January 24 1992 The 50 watt after 15 power minutes down circuit of continuous will begin to transmission operate in . the oterr to cooling protect fan on the the final rear panel amplifier fails to circuit operate Failure of the fan will prevent the power down circuit from returning transmit power normal levels since the transformer temperature remains high. This trouble can sometimes pe traced top pinched/ burnt wire near resistor R17 of the AVR unit X43 3070-01. Cause: If the red wire attached to connector CN2 of the AVR unit is pinched between the chassis and ground the insulation might be damaged and allow this line to short to the chassis. This wire supplies 15vd to the fan motor thru re ...
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