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Re: Kustom 100 blowing fuse [message #27384 is a reply to message #18016]

Mon, 10 June 2019 19:47

chicagobill
Messages: 2010
Registered: April 2003

Senior Member

The next tests should be of the transistors on the pc board. You need to test all 7 of them. Start with the driver transistors Q3, Q4, and Q5. Then test the protection circuit transistors Q6 and Q7, and finally the two input transistors Q1 and Q2.

There are 4 PNP transistors and 3 NPN transistors. The difference will mean that you will get low readings from base to emitter and base to collector with the red meter lead connected to the base or with the black lead connected to the base of the transistors. Typically the NPN's Q3, Q4 and Q6 will read low with the red lead on the base and the PNP's will read low with the black lead on the base.

There will be a little problem with testing the two protection transistors as there are low value resistors that connect the base and the emitter. As long as there are no zero readings, you can probably assume that the transistors are okay. If there is any real doubt, then remove them from the board to test them.

Finally test all 5 diodes in the circuit. With your meter, they should read just like a transistor junction, low reading in one direction and open in the other.

Tell me what transistors and diodes you have replaced, and what you used as replacements for them.

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[Message index]

		Kustom 100 blowing fuse By: imsteinrecording on Tue, 08 January 2013 05:45
		Re: Kustom 100 blowing fuse By: stevem on Tue, 08 January 2013 10:39
		Re: Kustom 100 blowing fuse By: imsteinrecording on Tue, 08 January 2013 16:16
		Re: Kustom 100 blowing fuse By: timetraveler on Wed, 10 April 2019 17:58
		Re: Kustom 100 blowing fuse By: chicagobill on Tue, 08 January 2013 12:03
		Re: Kustom 100 blowing fuse By: imsteinrecording on Tue, 08 January 2013 16:17
		Re: Kustom 100 blowing fuse By: chicagobill on Thu, 11 April 2019 15:15
		Re: Kustom 100 blowing fuse By: timetraveler on Fri, 12 April 2019 09:55
		Re: Kustom 100 blowing fuse By: stevem on Fri, 12 April 2019 06:10
		Re: Kustom 100 blowing fuse By: stevem on Fri, 12 April 2019 12:32
		Re: Kustom 100 blowing fuse By: chicagobill on Fri, 12 April 2019 13:31
		Re: Kustom 100 blowing fuse By: JDinPA17603 on Fri, 12 April 2019 21:02
		Re: Kustom 100 blowing fuse By: timetraveler on Sat, 13 April 2019 12:08
		Re: Kustom 100 blowing fuse By: stevem on Sat, 13 April 2019 06:24
		Re: Kustom 100 blowing fuse By: timetraveler on Sat, 13 April 2019 14:07
		Re: Kustom 100 blowing fuse By: timetraveler on Sat, 13 April 2019 14:14
		Re: Kustom 100 blowing fuse By: stevem on Sun, 14 April 2019 06:13
		Re: Kustom 100 blowing fuse By: JDinPA17603 on Sun, 14 April 2019 11:01
		Re: Kustom 100 blowing fuse By: timetraveler on Sun, 14 April 2019 19:05
		Re: Kustom 100 blowing fuse By: stevem on Mon, 15 April 2019 06:12
		Re: Kustom 100 blowing fuse By: chicagobill on Mon, 15 April 2019 12:23
		Re: Kustom 100 blowing fuse By: timetraveler on Mon, 22 April 2019 17:02
		Re: Kustom 100 blowing fuse By: JDinPA17603 on Mon, 22 April 2019 19:12
		Re: Kustom 100 blowing fuse By: timetraveler on Tue, 23 April 2019 10:42
		Re: Kustom 100 blowing fuse By: JDinPA17603 on Tue, 23 April 2019 12:12
		Re: Kustom 100 blowing fuse By: stevem on Tue, 23 April 2019 12:13
		Re: Kustom 100 blowing fuse By: chicagobill on Tue, 23 April 2019 12:30
		Re: Kustom 100 blowing fuse By: stevem on Tue, 23 April 2019 12:35
		Re: Kustom 100 blowing fuse By: timetraveler on Tue, 23 April 2019 13:19
		Re: Kustom 100 blowing fuse By: JDinPA17603 on Tue, 23 April 2019 18:00
		Re: Kustom 100 blowing fuse By: timetraveler on Wed, 24 April 2019 08:33
		Re: Kustom 100 blowing fuse By: chicagobill on Thu, 25 April 2019 13:20
		Re: Kustom 100 blowing fuse By: timetraveler on Thu, 09 May 2019 14:19
		Re: Kustom 100 blowing fuse By: JDinPA17603 on Thu, 09 May 2019 16:33
		Re: Kustom 100 blowing fuse By: timetraveler on Fri, 17 May 2019 11:43
		Re: Kustom 100 blowing fuse By: timetraveler on Sun, 19 May 2019 08:48
		Re: Kustom 100 blowing fuse By: timetraveler on Tue, 04 June 2019 13:31
		Re: Kustom 100 blowing fuse By: timetraveler on Tue, 04 June 2019 13:34
		Re: Kustom 100 blowing fuse By: stevem on Wed, 24 April 2019 07:40
		Re: Kustom 100 blowing fuse By: stevem on Fri, 17 May 2019 12:21
		Re: Kustom 100 blowing fuse By: timetraveler on Fri, 17 May 2019 12:51
		Re: Kustom 100 blowing fuse By: stevem on Fri, 17 May 2019 13:40
		Re: Kustom 100 blowing fuse By: chicagobill on Sun, 19 May 2019 15:13
		Re: Kustom 100 blowing fuse By: stevem on Mon, 27 May 2019 05:45
		Re: Kustom 100 blowing fuse By: chicagobill on Tue, 04 June 2019 23:28
		Re: Kustom 100 blowing fuse By: chicagobill on Wed, 05 June 2019 12:26
		Re: Kustom 100 blowing fuse By: timetraveler on Wed, 05 June 2019 20:27
		Re: Kustom 100 blowing fuse By: stevem on Wed, 05 June 2019 12:35
		Re: Kustom 100 blowing fuse By: timetraveler on Wed, 05 June 2019 20:19
		Re: Kustom 100 blowing fuse By: chicagobill on Wed, 05 June 2019 23:45
		Re: Kustom 100 blowing fuse By: chicagobill on Thu, 06 June 2019 01:36
		Re: Kustom 100 blowing fuse By: timetraveler on Thu, 06 June 2019 12:08
		Re: Kustom 100 blowing fuse By: stevem on Thu, 06 June 2019 12:25
		Re: Kustom 100 blowing fuse By: timetraveler on Thu, 06 June 2019 12:53
		Re: Kustom 100 blowing fuse By: chicagobill on Thu, 06 June 2019 15:34
		Re: Kustom 100 blowing fuse By: stevem on Fri, 07 June 2019 06:06
		Re: Kustom 100 blowing fuse By: timetraveler on Fri, 07 June 2019 12:17
		Re: Kustom 100 blowing fuse By: chicagobill on Fri, 07 June 2019 15:28
		Re: Kustom 100 blowing fuse By: timetraveler on Sat, 08 June 2019 09:24
		Re: Kustom 100 blowing fuse By: stevem on Sat, 08 June 2019 05:30
		Re: Kustom 100 blowing fuse By: chicagobill on Sat, 08 June 2019 12:01
		Re: Kustom 100 blowing fuse By: timetraveler on Mon, 10 June 2019 15:16
		Re: Kustom 100 blowing fuse By: chicagobill on Mon, 10 June 2019 19:47
		Re: Kustom 100 blowing fuse By: timetraveler on Wed, 12 June 2019 08:51
		Re: Kustom 100 blowing fuse By: stevem on Wed, 12 June 2019 12:07
		Re: Kustom 100 blowing fuse By: chicagobill on Wed, 12 June 2019 12:09
		Re: Kustom 100 blowing fuse By: timetraveler on Wed, 12 June 2019 21:24

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