Hameg HMS3010 / HMS-X Spectrum Analyzer

[szymon019]

Hi Team,

Does anyone have service manual for Hameg HMS-3010 / R&S HMS-X? It worked fine till one day when after powering up it lost TG and sensitivity.
Tracking generator generates lower half of sinusoidal waveforms, receiver sensitivity is also affected, preamplifier looks like also not working. At the beginning I expected that positive supply rail died but now it looks like maybe some other IC?

Thank you for suggestions.

[szymon019]

Hi All,

Does anyone has HMS-X HMS 3010 analyser with tracking generator and would be able to measure how TG output, looks like?
I would expect sinusoidal waveform but now in user manual I see it is not needed.
Scope time waveform, power measured by another Spectrum Analyser -20,8dBm when setting output to -20dBm. Signal is distorted in 2 stage BF520 based RF amplifiers. It see proper sine waveform.
Voltage for TG block is enabled on screen and controlled by R103G33 LDO. LDO output voltage in tollerance 3.2... sth so should be fine. Thermal image does not lead to part which would be overheated.