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Repair tip: HP54542A powers up but has no CRT display

Discussion in 'Electronic Repair' started by JW, Aug 15, 2007.

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  1. JW

    JW Guest

    I just had three of these 4 channel 500MHz scopes come across my bench for
    repair. The symptoms were that they would power up but have no CRT
    display. All the front panel indicators would light and stay that way,
    appearing like a CPU fault. As it turns out, the on-board Lithium battery
    located under the vertically mounted CRT board was the culprit - I
    temporarily placed a 3VDC power supply across the battery leads and
    powered up the unit and got a display informing me that the calibration
    settings have been lost. I replaced the battery and sent the units out for
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