On Sat, Sep 15, 2018 at 12:13 AM, Graham Butcher wrote:
I have about 35 of these boards of the first generation and about half
of them work. All of them have the holes for J203 but only a few have a
socket there but don't know what it's for. With the first generation
I mean a board which uses a PROM in a socket for firmware. The second
generation had Flash ROM and was updated using a special interface
connected to the back where the I/O interface usually is connected.
So J203 is not for firmware update.
When a faulty scope came in for repair the board was replaced and the
faulty one was not returned to the factory. A common problem of these was broken
BNC connectors. They were soldered to the board with two pins. These pins
often broke. When this problem was acknowledged Tek redesigned the board using
BNC connectors with four pins. So when a scope came in with one more more broken
BNC's the board was replaced even though it was otherwise OK. As a true technician
I never throw anything away and that's why I have so many.