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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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I just bought a flyback tester and have a drawer full of flybacks that
I want to test. How do I know what pins to connect it to? The directions say to simple hook it up to the primary windings, but which pins are these? Thanks |
#2
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To know this you will really need the schematics from the
manufactures. Remember that your tester is only doing a basic reactance test of the device. To properly test a flyback it has to be properly driven and loaded. Then the current pull and various voltages have to be varified. It is not a simple process to properly test a flyback! Jerry G. -- wrote: I just bought a flyback tester and have a drawer full of flybacks that I want to test. How do I know what pins to connect it to? The directions say to simple hook it up to the primary windings, but which pins are these? Thanks |
#3
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On Sun, 24 Aug 2008 14:31:01 -0700 (PDT), put
finger to keyboard and composed: I just bought a flyback tester and have a drawer full of flybacks that I want to test. How do I know what pins to connect it to? The directions say to simple hook it up to the primary windings, but which pins are these? Thanks Go here ... http://www.hrdiemen.es/products/inde...anguage=eng-GB .... and find the equivalent FBT. Then view the schematic of the equivalent. For example, this is the HR6214 FBT: http://www.hrdiemen.es/products/inde...mas/HR6214.gif The primary winding is between pins 1 and 17. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#4
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wrote:
I just bought a flyback tester and have a drawer full of flybacks that I want to test. How do I know what pins to connect it to? The directions say to simple hook it up to the primary windings, but which pins are these? Thanks "Jerry G." wrote in message ... To know this you will really need the schematics from the manufactures. Remember that your tester is only doing a basic reactance test of the device ... snip That may not be strictly true. If it's a Bob Parker design flyback tester (now reworked and rebranded by another company), then it actually 'rings' the tranny, a test that shows up most common defects such as shorted turns on the primary, and short or leaky diodes in the HV stack. Arfa |
#5
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![]() With any of these flyback checkers they will not show high voltage breakdown, or critical problems with the flyback. This is only a simple test! I have been through this! Jerry G. -- On Aug 25, 10:38*am, "Arfa Daily" wrote: wrote: I just bought a flyback tester and have a drawer full of flybacks that I want to test. *How do I know what pins to connect it to? *The directions say to simple hook it up to the primary windings, but which pins are these? Thanks "Jerry G." wrote in message ... To know this you will really need the schematics from the manufactures. Remember that your tester is only doing a basic reactance test of the device ... snip That may not be strictly true. If it's a Bob Parker design flyback tester (now reworked and rebranded by another company), then it actually 'rings' the tranny, a test that shows up most common defects such as shorted turns on the primary, and short or leaky diodes in the HV stack. Arfa |
#6
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![]() "Jerry G." wrote in message ... -- On Aug 25, 10:38 am, "Arfa Daily" wrote: wrote: I just bought a flyback tester and have a drawer full of flybacks that I want to test. How do I know what pins to connect it to? The directions say to simple hook it up to the primary windings, but which pins are these? Thanks "Jerry G." wrote in message ... To know this you will really need the schematics from the manufactures. Remember that your tester is only doing a basic reactance test of the device ... snip That may not be strictly true. If it's a Bob Parker design flyback tester (now reworked and rebranded by another company), then it actually 'rings' the tranny, a test that shows up most common defects such as shorted turns on the primary, and short or leaky diodes in the HV stack. Arfa With any of these flyback checkers they will not show high voltage breakdown, or critical problems with the flyback. This is only a simple test! I have been through this! Jerry G. Oh, I don't dispute that a BP will not pick up problems such as HV breakdown, Jerry, but that is usually - or at least mostly - self evident in that you can see the miniature lightning flying out of the pin hole, or smell the ozone being generated, or see the effects on the screen as brushing, or hear the effects on the audio, or even just hear it physically hissing. The only point that I was making is that the BP unit is not a 'simple' reactance tester, but does a test which better simulates the conditions that such a tranny operates in, when doing its normal job. Almost any deviation from its correctly servicable parameters, will alter the way in which the tranny rings, which will be picked up by the tester. Of course, the results are open to a degree of experience and interpretation, in much the same way as those from an ESR meter are, and a new, or at least 'known good' tranny is useful to compare by, but never-the-less, the BP is a useful tool even on its own, for picking up "most common defects", which is all I was actually saying ... Arfa |
#7
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"Jerry G." wrote in message
... With any of these flyback checkers they will not show high voltage breakdown, or critical problems with the flyback. This is only a simple test! I have been through this! Jerry G. But the Sencore drive tests catch most of them. It applies a 25vp-p pulse to the primary and you should get out 500-600vdc on most integrated flybacks. It is far better than ringing because it tests the high voltage rectifier, if only at a fraction of the output. It won't catch a leaky insulator, but it will get most bad flybacks otherwise. Leonard |
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