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Re: K100B-5 [message #25889 is a reply to message #25801]

Fri, 10 February 2017 21:33

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

Do you have any 50 volt capacitors around? If you do, you can substitute it for the bad one to see if the power supply will power up normally. The value really doesn't matter for this test.

Also you can test the two power transistors that are mounted to the bottom of the chassis. Pull off the black plastic plug with the yellow and blue wires and use the diode test function on your meter. The pin where the blue wire connects is the Base, the pin with the yellow wire is the Emitter and the case mounting screw with the red wire is the Collector.

Touch and hold the red meter lead to the Base pin. Touch the black lead to the Emitter pin and note the reading. Next touch the black lead to the red case Collector screw and note the reading. Then reverse the two meter leads and note the readings.

The final test is to touch and hold the red lead to the Collector and the black lead to the Emitter pin. Note the meter reading. Then reverse the two meter leads and note the meter reading.

In no case should you get a zero reading (just like holding the two meter leads together). In one direction you will probably get a reading of about .6 volts and reversed, open circuit (just like when the two meter leads are not touching anything).

Post your readings here and we'll review.

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[Message index]

		K100B-5 By: irish77060 on Fri, 27 January 2017 13:03
		Re: K100B-5 By: chicagobill on Fri, 27 January 2017 20:27
		Re: K100B-5 By: irish77060 on Fri, 27 January 2017 22:48
		Re: K100B-5 By: irish77060 on Mon, 30 January 2017 10:56
		Re: K100B-5 By: chicagobill on Mon, 30 January 2017 11:43
		Re: K100B-5 By: stevem on Sat, 28 January 2017 06:26
		Re: K100B-5 By: chicagobill on Sun, 29 January 2017 17:14
		Re: K100B-5 By: stevem on Mon, 30 January 2017 11:31
		Re: K100B-5 By: chicagobill on Mon, 30 January 2017 12:33
		Re: K100B-5 By: irish77060 on Mon, 30 January 2017 13:35
		Re: K100B-5 By: chicagobill on Mon, 30 January 2017 14:41
		Re: K100B-5 By: irish77060 on Wed, 01 February 2017 14:06
		Re: K100B-5 By: chicagobill on Wed, 01 February 2017 16:49
		Re: K100B-5 By: irish77060 on Thu, 02 February 2017 11:51
		Re: K100B-5 By: irish77060 on Thu, 02 February 2017 11:56
		Re: K100B-5 By: chicagobill on Thu, 02 February 2017 12:43
		Re: K100B-5 By: irish77060 on Thu, 02 February 2017 12:54
		Re: K100B-5 By: chicagobill on Thu, 02 February 2017 17:22
		Re: K100B-5 By: irish77060 on Tue, 07 February 2017 14:54
		Re: K100B-5 By: chicagobill on Tue, 07 February 2017 20:59
		Re: K100B-5 By: irish77060 on Wed, 08 February 2017 14:25
		Re: K100B-5 By: chicagobill on Wed, 08 February 2017 15:18
		Re: K100B-5 By: irish77060 on Wed, 08 February 2017 15:51
		Re: K100B-5 By: chicagobill on Wed, 08 February 2017 15:57
		Re: K100B-5 By: irish77060 on Wed, 08 February 2017 17:13
		Re: K100B-5 By: chicagobill on Wed, 08 February 2017 18:02
		Re: K100B-5 By: irish77060 on Fri, 10 February 2017 13:28
		Re: K100B-5 By: chicagobill on Fri, 10 February 2017 21:33
		Re: K100B-5 By: irish77060 on Sat, 11 February 2017 11:18
		Re: K100B-5 By: chicagobill on Sat, 11 February 2017 11:39
		Re: K100B-5 By: irish77060 on Sat, 11 February 2017 17:50
		Re: K100B-5 By: irish77060 on Sun, 12 February 2017 07:27
		Re: K100B-5 By: irish77060 on Sun, 12 February 2017 12:11
		Re: K100B-5 By: chicagobill on Sun, 12 February 2017 14:32
		Re: K100B-5 By: irish77060 on Sun, 12 February 2017 19:07
		Re: K100B-5 By: chicagobill on Sun, 12 February 2017 19:17
		Re: K100B-5 By: irish77060 on Mon, 13 February 2017 12:17
		Re: K100B-5 By: chicagobill on Mon, 13 February 2017 13:01
		Re: K100B-5 By: irish77060 on Mon, 13 February 2017 13:07
		Re: K100B-5 By: irish77060 on Mon, 13 February 2017 13:31
		Re: K100B-5 By: stevem on Mon, 13 February 2017 13:47
		Re: K100B-5 By: irish77060 on Mon, 13 February 2017 16:20
		Re: K100B-5 By: chicagobill on Mon, 13 February 2017 18:25
		Re: K100B-5 By: irish77060 on Tue, 14 February 2017 10:36
		Re: K100B-5 By: stevem on Tue, 14 February 2017 06:24
		Re: K100B-5 By: irish77060 on Tue, 14 February 2017 10:38
		Re: K100B-5 By: chicagobill on Tue, 14 February 2017 10:55
		Re: K100B-5 By: irish77060 on Tue, 14 February 2017 15:07
		Re: K100B-5 By: irish77060 on Tue, 14 February 2017 19:12
		Re: K100B-5 By: chicagobill on Wed, 15 February 2017 02:18
		Re: K100B-5 By: irish77060 on Wed, 15 February 2017 13:25

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