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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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HP 1703A with No trigger ( HELP )
Hello All,
I just bought an HP 1703A Dual trace scope off E-Bay and sure enough..it has problems. Seems the only time the trace sweeps across the screeen is when I change modes from Internal to External Trigger. At first I thought it may be a dirty switch but cleaning didn't help. From what I understand...the trace is swept left to right by a "Sawtooth Oscillator" that is synchronized to peaks in the input waveform trying to be displayed (Channel A or B). Seems this "Oscillator" is not resetting. Instead it sweeps once then locks up till I "jog" it by changing modes. Then it sweeps across ONCE and then locks up AGAIN until I "jog" it. I've checked all the circuit board edge connects, cleaned the rotary switch that selects Normal/Delayed/External Trigger, tapped and wiggled inside for lose connections and yet no luck. Any chance someone has some hints or better yet a schematic they could send my way? Any and ALL help would be GREATLY appreciated. Thanks....and a very best to all for the Holiday Season. Cheers....Dean. |
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