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TM500 Liquid Crystal Driver: Difference between revisions
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The main board is very good quality. | The main board is very good quality. | ||
There are two "proto" type boards in the unit. One is for fuses. The other has a pair of 74121 | There are two "proto" type boards in the unit. One is for fuses. The other has a pair of [[74121]] ICs on it. | ||
Glenn Little says: | |||
<blockquote> | |||
When I got it the edge card connector was damaged, thankfully in a place where there are no used pins. | When I got it the edge card connector was damaged, thankfully in a place where there are no used pins. | ||
There was one power transistor missing and I can replace it with one like in the other channel. | |||
There was one power transistor missing and I can replace it with one like in the other channel. There is also a ground binding post missing, this is easily replaced. | There is also a ground binding post missing, this is easily replaced. | ||
The pictures are of the unit as I received it. | The pictures are of the unit as I received it. | ||
</blockquote> | |||
This has controls for PW UPPER and PW LOWER for both channels. | This has controls for PW UPPER and PW LOWER for both channels. | ||
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The front binding posts are UPPER OUTPUT, LOWER OUTPUT and GROUND for each channel. | The front binding posts are UPPER OUTPUT, LOWER OUTPUT and GROUND for each channel. | ||
The active backplane pins are 2A, 3A, 6A, 7A, 8A, 9A, 10A, 12A, and 7B. 8B, 11B and 8A are connected. 12A and 12B are connected together. All of these pins are power related, so the only inputs and outputs are via the front panel. There is a keyway between pins 6 and 7. | The active backplane pins are 2A, 3A, 6A, 7A, 8A, 9A, 10A, 12A, and 7B. 8B, 11B and 8A are connected. | ||
12A and 12B are connected together. | |||
All of these pins are power related, so the only inputs and outputs are via the front panel. | |||
There is a keyway between pins 6 and 7. | |||
There are "flying" jumpers between some IC pins with some of these pins lifted from the sockets. Probably still a work in progress. | There are "flying" jumpers between some IC pins with some of these pins lifted from the sockets. Probably still a work in progress. | ||