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Post subject: Electronic Tacho Fault
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adee56  Daily Burner Joined: 17 Jun 2006 Total posts: 111 Location: Perth Western Australia |
I was given a faulty electronic tacho, same as RZ 1986.
I pulled it apart, the blue resistor next to a diode looked like it had overheated and melted the solder.
I resoldered the resistor and the tacho works.
Is this a common fault with the tacho or does some other fault cause the overheated resistor problem?
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Posted: Sun Sep 24, 2006 12:51 pm
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adee56Daily Burner Joined: 17 Jun 2006 Total posts: 111 Location: Perth Western Australia |
I have another faulty tacho, the same resistor looks cooked and faulty.
Has anyone got a F2 or TZR 1987 tacho that is already apart?
I need to know ohm value of the (blue on this one) resistor near the zener diode No. ZD1 and the capacitor No. C7.
I think the resistor is used to protect the tacho circuit board from over voltage.
I have another good working tacho but I don't want to open it if I can avoid it.
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Posted: Mon May 05, 2008 2:16 pm
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Post subject: Faulty Tacho Repair
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adee56Daily Burner Joined: 17 Jun 2006 Total posts: 111 Location: Perth Western Australia |
I opened my good tacho to answer my own question.
The F2 tacho that was not working, had a cooked blue resistor near diode ZD1, I replaced the faulty resistor with a new 39 ohm resistor, tacho now works. 
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Posted: Thu Jun 19, 2008 2:20 pm
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ief Powerband Master Joined: 27 Jan 2004 Total posts: 774 Location: netherlands |
allways good to know, tnx for the info.
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Posted: Thu Jun 19, 2008 5:40 pm
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| p51bombay Joined: 23 Jan 2004 Total posts: 9656 |
You can work out the resistance of those by reading the colour coded bands.
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Posted: Fri Jun 20, 2008 1:23 am
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adee56Daily Burner Joined: 17 Jun 2006 Total posts: 111 Location: Perth Western Australia |
No colour bands on this resitor it is all blue, between 1 & 5 watt.
If it is in good condition you can read number 39 on it, if the resistor is cooked and faulty the value cannot be read.
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Posted: Fri Jun 20, 2008 9:50 am
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