I've got a partially working CE-7120 Field Service Monitor and am
desperately seeking a service manual. The unit "kinda" works from 12Vdc
but is totally inop with AC input. If AC cable is hooked up and DC
cables are hooked up simultaneously, and then you switch to AC input,
the DC cables can be unhooked and it again seems to kinda work until
you turn it off. No CRT display for either spectrum analysis or
oscilloscope functions. Receives off the air albeit poorly. Does this
unit use a "scan derived" power supply (ie does high voltage from the
CRT section have to be present for the power supply to work normally)?
If you have a service manual or have experienced a similar problem with
your CE-7120, please advise.