Keysight / Agilent MSO-X 7000A Repair

[smaultre]

Maybe somebody have any good service manual for it?
It's boot and halt with message PLL unlock, uncalibrated..
Do not response on any buttons.

[smaultre]

I make some investigations.
There is some measurements, 2 chips marked with RED getting really hot .
Scopes boot to measurements screen with error message:
"software failure,PLL unlock, uncalibrated, defaults loaded"
 Also it do not feed 5V to USB HOST connectors (can't read usb), but
 when i plug it to PC its find a new device..
 U1809 - oscillator powered, but tuned off state (worked, tested)
 U2901 74act04 Hex Inverter getting very hot
 U2520 act11374 Octal D-Type Edge-Triggered Flip-Flop getting very hot too
 500Mhz VCO generator module itself seems to start
but ACQ chips (5 pcs) do not start (no oscillations on pins some have log"1", some log"0")

[HighVoltage]

This is a MSO 7000A (No X)

If you find a component to be hot and a supply voltage rail low, look for a short.
Either an IC or a capacitor shorted is most likely the fault.

Always start with checking all the voltage supply rails.

Unfortunately there is no good service manual available.
I have repaired a few of these 7000A and 7000B scopes and with enough time and effort, they are repairable,
unless you get a fault in an agilent specific chip.
 

[smaultre]

Do you have any voltage measurements sheets? Can you test  U1809 - oscillator, does it generating on the default state? Do you know how the VCO works here?