After replacing all filter caps in power supply, supply ripple is below spec on all voltage's, normal 1V @ 50 ohm output Markers are all working. But 25V @ 1K ohm Marker Amplifier is only working up t

Picture 0f 50mS marks is in picture folder "184 Time mark Gen. Needs filter Caps" , can't get oscillator to adjust to 10Mhz, max is 9.999843. I know this is close enough but I am retired and have plen

Thanks Tom, you were right. I adjusted R306 in the 50mS divider circuit and all time marks are working now! Not a bad unit for $96.46 with shipping. And a couple capacitors and PC boards. Thank you to

Sorry fellas, the overshoot I was seeing was because I had trigger set to AC coupling. New Picture shows irregular intervals with DC trigger. David

Dialight makes a led bulb 507-4859-3332-500, Vf=20V , mA=20, that fits that holder on the 184

I have been hesitant to touch the adjustments , but wondering if the pot on 50mS circuit is making intermittent contact. The capacitor must be discharging at random levels to cause the instability tha

Checked ripple carefully with 1x probe and short ground spring. Ripple is 24mV on -30V , 30mV on +12V , and is 62mV on 125V. worst one is -30V. The other two not that far from specs. Don't think that

Scope says amplitude is varying 160mV. Amplitude is 1.18V to 1.34V. has to be power supply ripple that is problem now. David

I think the ripple is probably the problem with the 50mS to 5S range, because the amplitude of the time marks in other ranges is not stable. It is oscillating about 100mV. David

Voltage's are good but ripple is real bad. Is 200mV, specification says 15mV. You guys have any suggestions where to look? Still haven't replaced cap 512 on 125 volt supply, Could that affect all thre

I replaced Capacitor's no. 552 and 532 today, Voltage's are good now, 184 Time mark generator is working now, up to 10mS. 50mS to 5S is not stable, have to troubleshoot that circuit. I had PCB boards

Thanks for the info on the ripple current, I never thought about using spice to find it. I will use the current you came up with.Already had part in shopping cart at Mouser. Part no. EEU-EE2E820S, rat

Yeah, that's what i figured. New capacitors are higher rated, more dependable, and a lot less expensive. Even if I could find original type replacements, would I put a 30 year old fuel pump in my car?

I have no idea what the specs are on these old caps, The serial no. on this unit is 000287, date on PCB is 1965. The schematic shows 125V RMS @ 0.125A across secondary winding of transformer, and 175V

Just got a 184 for parts, powers on, oscillator good. Need to replace filter caps in power supply, 12v ripple on +125v supply, +2v ripple on 12v, 4.8v on -30v supply. When I jumper a 1500uF parallel a

Had same cap blow in my 465 two years ago, they don't last forever. Look up Capacitor Reforming on net, it will explain why aluminum caps go bad. I replaced all the filter caps in power supply section

Cap C1220 is wet Tantalum, all caps in 465 are tantalum except for Filter Caps in power supply section. I replaced C1220 with a Aluminum electrolytic, and all is working correctly. Also replaced R1220

Hi folks, been long time,My 465 has no horizontal sweep, vertical still working, single dot in center of screen with no input. Vertical line or trace in center with input signal.Checking Horizontal Am

Would it be safer to remove the trigger board to get access to the caps? If I get to the bad capacitor I am going to replace all the filter capacitors. I don't want to have to do this again.Have to fi

Hi guys, appreciate your help. I soldered a 4700uF cap across c1552 and scope is running fine. The +5V regulated supply is +5.008V with 1.6mV ripple. Getting that cap changed looks like open heart sur