Hi David,
The Dual In Line 7 pin chip is a TNY264P from Power Integrations, Inc.
I bought mine from Farnell in Aus so you should be able to source from Newark in USA. Newark Part No is 93K0737.
Symptoms when this chip fails are a dead front panel display caused by no voltage out on the pin marked 5V on the connector on the bottom of the main spindle drive board. Although this is marked 5V on the silkscreen on the board, it should be 6V as it comes directly from the 7806 TO220 regulator.
Be careful however because I have seen several dead spindle situations caused by the sliding part of the depth vernier shorting out on the front panel keypad board. When this happens a catestrophic failure of the mill generally results. The short takes out the 7806 regulator on the spindle drive board, an optocoupler (and often tracks and resistors) on the keypad board , and blows the hall effect devices in the spindle motor itself. I have yet to identify the hall effect devices but have purchased some generic devices from Farnell to try to repair a couple of blown spindle motors.
I have successfully repaired 3 blown keypad boards and 3 spindle drive boards so far and am trying to repair 2 spindle motors when I have some time (maybe this week with any luck).
Have a look at the instructions that I posted this week on this forum for modifying the keypad board to give an additional 2mm of clearance between the vernier and the board. I have done this mod to my machine and I am now confident that mine will not short out now.
Lots of luck and if you need help do not hesitate to post again. I am only too happy to assist if I can.
Regards
Chrisjh  |