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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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Snap-On MT2261 timing light
I'm relating the following experience to show how information held by
the US patent office helped me with a repair. I recently repaired a Snap-On MT2261 timing light with an intermittent flash problem. As expected, Snap-On were not able to provide circuit diagrams, or a service manual. Their quoted price for a replacement circuit board was AU$900 which was more than the cost of a new unit. However, I noticed that on the ratings sticker there was a reference to two US patent numbers. Sure enough, a search at the US patent office turned up a document (http://patimg1.uspto.gov/.piw?Docid=04713617) with a circuit diagram and an in-depth functional description, including a detailed flowchart for the firmware. BTW, the fault was a 0.033uF HV ceramic cap connected to the low voltage winding of the trigger transformer. I replaced it with a 2kV pulse rated polypropylene cap. Because of its size, I had to relocate the replacement cap and attach it with 300V fly leads. Incidentally, the original ceramic cap tested OK on a cap meter. I confirmed that it was faulty by reinstalling it and reproducing the original problem. PS. The following site provided the document in a more convenient format (a 20-page .pdf file), but required me to register (for free). http://www.freepatentsonline.com/4713617.html - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#2
Posted to sci.electronics.repair
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Snap-On MT2261 timing light
Franc Zabkar wrote: I'm relating the following experience to show how information held by the US patent office helped me with a repair. I recently repaired a Snap-On MT2261 timing light with an intermittent flash problem. As expected, Snap-On were not able to provide circuit diagrams, or a service manual. Their quoted price for a replacement circuit board was AU$900 which was more than the cost of a new unit. However, I noticed that on the ratings sticker there was a reference to two US patent numbers. Sure enough, a search at the US patent office turned up a document (http://patimg1.uspto.gov/.piw?Docid=04713617) with a circuit diagram and an in-depth functional description, including a detailed flowchart for the firmware. BTW, the fault was a 0.033uF HV ceramic cap connected to the low voltage winding of the trigger transformer. I replaced it with a 2kV pulse rated polypropylene cap. Because of its size, I had to relocate the replacement cap and attach it with 300V fly leads. Incidentally, the original ceramic cap tested OK on a cap meter. I confirmed that it was faulty by reinstalling it and reproducing the original problem. PS. The following site provided the document in a more convenient format (a 20-page .pdf file), but required me to register (for free). http://www.freepatentsonline.com/4713617.html - Franc Zabkar GREAT IDEA! H. R. Hofmann -- Please remove one 'i' from my address when replying by email. |
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