07-03-2012, 10:00 PM
Another step along the way.
Having established that the trace sweeps in auto mode (but not in Ch.1 or CH.2 mode) I thought the logical next thing would be to see if external trigger worked. I fed the same signal to Ch.1 and to the Ext Trigger input and low and behold it triggers beautifully - solid as a rock. So, you can see from the circuit diagram that this must mean that everything downstream of the trigger coupling selector switch (Sb-b) must be OK. My investigation therefore is now heading back upstream from there. So far I've traced the wiring to the edge connector of the timebase module and across the the channel input module. I'll follow it on from there next time. What seems a bit strange is that it won't trigger on either channel and both seem to be separate thus implying that whatever the fault is, it affects both channels.
Well that's for another day.
If my logic here is flawed please let me know
Cheers, John
Having established that the trace sweeps in auto mode (but not in Ch.1 or CH.2 mode) I thought the logical next thing would be to see if external trigger worked. I fed the same signal to Ch.1 and to the Ext Trigger input and low and behold it triggers beautifully - solid as a rock. So, you can see from the circuit diagram that this must mean that everything downstream of the trigger coupling selector switch (Sb-b) must be OK. My investigation therefore is now heading back upstream from there. So far I've traced the wiring to the edge connector of the timebase module and across the the channel input module. I'll follow it on from there next time. What seems a bit strange is that it won't trigger on either channel and both seem to be separate thus implying that whatever the fault is, it affects both channels.
Well that's for another day.
If my logic here is flawed please let me know
Cheers, John
Time flies like an arrow, fruitflies like a banana!
