hello all ,
I have been facing problem with HP 8594A spectrum analyser.
1.As the instrument is switched on , FREQ UNCAL is displayed which is a permanent fixture.
2.When i try to calibrate using CAL OUT the result is SIGNAL NOT FOUND & SRQ110.
3. The trace line is slow in movement , data entry response also appears to be slow.
I couldn,t find service manual for 8594 series , but tried using 8590 series one.
As per that manual either A7 analog pcb, A16 processor , counter lock , or YTO may be faulty but not able to zero-on by using this manual.
I observed the following:
1.on A7 analog interface board Q1 is getting warm
but if cable running to YTO removed from the PCB, heat is normal.
2. FREQ UNCAL disappears & trace line moves fast when Counterlock board flat cable is removed
waiting for ur help Pls suggest how do proceed.
Thanx in advance
Locked due to duplicate thread: https://www.eevblog.com/forum/repair/help-needed-to-repair-hp-spectrum-analyser/msg1494742/#msg1494742