UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Whaam68 · 2nd Feb 2020, 2:03 pm

Hi
I’m slowly working through the mechanism power supply board of an early 1980s TEAC A300 cassette deck (see thread on page 2 of the tape sub forum) - attempting to solve the lack of power to the mechanism. All the diodes so far have been ok but I’ve just tested the SCR a 2P1M. With my meter on the 20k range and negative on the anode and positive on the cathode (per the datasheet pinout) I’m reading O/C rather than high resistance. Doctor google suggests that this is a bad thing! Can I replace this with any TO-202 SCR with a 4A 100v rating? Can anyone recommend a common substitute.

Supplemental question what is likely to have caused the failure? Assuming my conclusion above is right!
Thanks
Mike

2nd Feb 2020, 2:03 pm	#1
Whaam68 Hexode Join Date: Feb 2007 Location: Luton, Bedfordshire, UK. Posts: 457	2P1M 7Y SCR equivalent Hi I’m slowly working through the mechanism power supply board of an early 1980s TEAC A300 cassette deck (see thread on page 2 of the tape sub forum) - attempting to solve the lack of power to the mechanism. All the diodes so far have been ok but I’ve just tested the SCR a 2P1M. With my meter on the 20k range and negative on the anode and positive on the cathode (per the datasheet pinout) I’m reading O/C rather than high resistance. Doctor google suggests that this is a bad thing! Can I replace this with any TO-202 SCR with a 4A 100v rating? Can anyone recommend a common substitute. Supplemental question what is likely to have caused the failure? Assuming my conclusion above is right! Thanks Mike Attached Thumbnails