I just got a new to me Iwatsu SS-7840 (aka LeCroy LA314) from an auction here in UK. It seems a nicely put together 'scope designed to compete with the Tektronix 2456B.
![](https://www.eevblog.com/forum/testgear/a-look-inside-an-iwatsu-ss-8740-(lecroy-la314)-400mhz-analog-scope/?action=dlattach;attach=589666;image)
As they say don't turn it on, take it apart!
Power supply, HV, Horizontal and Z-Axis
![](https://www.eevblog.com/forum/testgear/a-look-inside-an-iwatsu-ss-8740-(lecroy-la314)-400mhz-analog-scope/?action=dlattach;attach=589672;image)
Detail of conformal coated sub-board in PSU
![](https://www.eevblog.com/forum/testgear/a-look-inside-an-iwatsu-ss-8740-(lecroy-la314)-400mhz-analog-scope/?action=dlattach;attach=589696;image)
Vertical board plus detail of CRT termination - can anyone give me any idea what the wire stub on one side of the termination is for - my guess is that it has something to do with the bandwidth variant that goes to 470MHz?
![](https://www.eevblog.com/forum/testgear/a-look-inside-an-iwatsu-ss-8740-(lecroy-la314)-400mhz-analog-scope/?action=dlattach;attach=589678;image)
![](https://www.eevblog.com/forum/testgear/a-look-inside-an-iwatsu-ss-8740-(lecroy-la314)-400mhz-analog-scope/?action=dlattach;attach=589684;image)
CPU board (lower left) and main board with delay line (lower right)
![](https://www.eevblog.com/forum/testgear/a-look-inside-an-iwatsu-ss-8740-(lecroy-la314)-400mhz-analog-scope/?action=dlattach;attach=589690;image)
I was amazed to find that the CR2354 backup battery soldered to the CPU board in 1997 still has a good charge on it!
Now if only I can find an IE-1066 Adjustment Jig (calibration fixture) to go with it!
Dave