We have problems with a 8594E spectrum analyzer.
When we power up the device, the screen test appears (a 10110100 repeated), vertical lines all over the display. Immediately followed by the same pattern, but shifted a few bits. This screen dissappears ad makes place for a black screen. Then we have no response from any key.
The only response we get is from the green preset key. On pressing this key, the screen test appears again, but now stops at the second pattern. Leaving the stripes on the screen.
Any idea on how to fix this. (I tested several power supply voltages and they all seem to be present.)