RL02 cont'd

[Chuck Guzis]

On 11/16/2005 at 11:31 AM Charles wrote:

>I think I've found the problem with my RL02 drive. Tracing back
>through the fault detector logic, the Clock Error Detector output
>is set. Backing up to the entrance, the 4.1 MHz system clock is
>coming in correctly on the two 75107 line receiver differential
>input pins (E61 1 and 2) but no clock is coming out of it... no
>clock -> no operation -> Fault light on :)
>Hope they aren't unobtainium parts!

You may want to double check the strobe (enable) inputs on the 107s (pins 5
(A side) 6 (common) and 8 (B side)).  All must be high for there to be
output.  If the 107's are bad, try to scavenge the 107B parts, as the
inputs have better protection than the A parts.

Cheers,
Chuck