I’m looking at a schematic for a 45 year old FM tuner/controller and there’s a central processor in it, listed as “MN1400ST, IC, Micro Computer.”
Unit currently only works as a clock, I’ve done some troubleshooting and am likely to replace one or two latch IC’s if not some switching transistors (I’ll dig in to it later).
I already fixed another one many months ago, works fine. But as I go through the schematic, IF that is the bad component (there’s NO output to the station selection LEDs or power off AC2 lights part of the board which makes me think it’s one of the peripheral ICs) but just in case…
QUESTION IS:
What difference, if any, does the ST suffix make vs. the SJ suffix in the part.
Trust me, I’ve scoured the web, including some of the self-denoted “geek” sites, Elcodis, and others and have come up with squat other than a general spec sheet PDF for the part in Japanese.
Thanks in advance.
Unit currently only works as a clock, I’ve done some troubleshooting and am likely to replace one or two latch IC’s if not some switching transistors (I’ll dig in to it later).
I already fixed another one many months ago, works fine. But as I go through the schematic, IF that is the bad component (there’s NO output to the station selection LEDs or power off AC2 lights part of the board which makes me think it’s one of the peripheral ICs) but just in case…
QUESTION IS:
What difference, if any, does the ST suffix make vs. the SJ suffix in the part.
Trust me, I’ve scoured the web, including some of the self-denoted “geek” sites, Elcodis, and others and have come up with squat other than a general spec sheet PDF for the part in Japanese.
Thanks in advance.