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Ran the scope up with variac , slowly a couple of times , a/c to pcb board after mains switch voltage on DC out from bridge 309 volts DC. a/c in 250 mA stable. power on/off at full voltage , nothing

Ok my new capacitors have arrived. However, I have no idea how to disassemble the power supply. Is there at least a good trick for removing the can capacitors without lifting all the traces? Thanks

I agree that Chuck should be reinstated if we wants. DaveD

I can't wait until Dennis is back so Chuck Harris can be reinstated. larry

Hi, yes I agree. I had a similar 7904 problem years ago. In tic mode there was also a hissing sound. The problem was the HV multiplier. G?ran

A minimum load is indeed required, in the order of 50 W. The cause of tick mode might also be in the HT wiring. In an old message #64991 I wrote the following: "My 7904 stayed in tick mode because of

Hi all, I'm battling away with the two 7904s. The one with the faulty CRT had a functional power supply. The other one was completely dead despite having intact fuses. I transplanted the working power

Hi,? I looked in 7a19 and 7a24 manuals and fuse listed for f100 (7a24) and f10 (7a19) are the same with part # 159-0118-00, which doesn't agree with your number.? Both plug-ins have 2 spare.? I

The Mouser surface mount fuse idea has merit, Harvey. I would solder it on the lower ceramic substrate, bridging the blown thin film. It would still need to meet the 0.3 ohms (or less) spec. to keep

I think I may have answered my own question. A glass fuse rated at 0.2A and 1 1/4" long has a resistance of about 6.75 ohms. To get down to 0.3 ohms using the 0.2A rated wire from such a fuse would

Hmm, I haven't tried at all. you might be able to do the following: 1) design a PC board with the fuse shape.? Be sure you panelize it when you send it off, you'll get lots for very little. The fuse

Has anyone tried to open and repair one of these ceramic-based stripline fuses?? This thread has been dormant for some time. A 0.3 ohm fuse resistance makes sense in a 50 ohm terminated input. It

Tom, See if CR1796 is bad (shorted). Clean the pins and sockets for the transistors and IC. The pots may need cleaning as well. It is possible a transistor is bad. See about the voltages at points

Hi all, thanks for the information provided. I decided to modify the P6133 probes into 1x probes: I opened both the broken probe tips, and replaced the burned hybrid with a zero Ohm replacement. I

Hi Jaap, Did you manage to get information on converting a 2715 to 2712? I have a 2715 and tried to change the resistors on the motherboard and now it says "Misconfigured Spectrum Analyser" on the

The channel 2 amp seems to be saturating full + signal. Now why? Since everything works fine with channel 1, then that part of the switch and the vertical amp are ok. So either the preamp is

I am troubleshooting a 465Bs which suddenly lost the channel 2 display trace. I have the appropriate Tek service manual and test equipment including another working 465B. My current troubleshooting

Thanks Andy. If true, that would explain the 7CT1N's cleaner trace at the sweep begin and end points too. Yeah, flying leads on sensitive measurements is a no-go for several reasons.

Looks good. And I happen to have some of those cells and some holders to use. Gonna have to look and see if I have any boost converters in my box of modules... -- Member of the toughest, meanest,

Mark- thank you...my "B" is low definitely will have to verify. Renée