The HL-2040 has both a parallel and a USB input. The problem with using the Brother HL-2040 with the TDS754A is that the HL-2040 only works in GDI mode, which I guess the TDS754A can't use. I suppose

Thanks I just ordered the switch from Qservice on their E bay store. I didn't even think of Ebay. Thanks for the help !!!

Just got a 466 that was described as 'working then just quit' several years ago. All voltage measure slightly low but the +15 is way down to 1.4V. Unregulated +15 is slightly high 25.9 vs 22.5

I've emailed the files to directly to you off-list. These are great printers for single sided black-only printing and can do 1200 dpi at 20ppm. Brother rates the drums for these printers at 15k pages,

Morris, I am copying below my last post tonight from the Antique Radio Forum. A couple of the fellows there have been trying to help fix my 555 also. Yes, the bad 21 TB is in the position for the

You're going to make me break out my Clipboard, aren't you? One thing I wondered about the z-axis logic shown in the 7603 schematics is if the schematics were drawn wrong but I checked the other 76xx

Are you sure about this? What about the +140 and +65 volt outputs? The +65 volt output is used as a reference for the other supply voltages so if it is low, then they will be low also? Vcc for

Thanks for the advice. Unfortunately the components in question are in the most in accessible spot, between the Volt/Div switch and PCB and jammed in under the CRT. I had to think about

Hi David, Sorry, it was not my intention to force you to do "homework" calculations! Having read the discussion again and again, I think I see now why we seemingly disagree about the effect of an

Please check the health of C1757 (10 mfd) at the +15V rail. I remember having intermittent problems with my 466 3 years ago - at first the scope did shut down after half an hour of operation, later

Albert, yes this is what I am thinking. If I remove all inputs to the Z axis amplifier it outputs about 20 V, which should blank the beam - but doesn't. Shorting the input to ground, i.e. full input

Good info Marian, this makes all discussions about intensity pot and Z axis logic superfluous. An easy explanation would be that the polarities of both diodes CR1269 and CR1270 are reversed. That

(continued) Too quick conclusion since that DC restorer circuit has to supply the full grid-kathode voltage. A reversal would mean that the grid becomes positive w.r.t. the kathode. Albert ---In

I have been wanting to tear into the 7603 z-axis logic for a while because it is so inscrutable at first glance. At least now I can look at it and follow how it works. I was thinking about a

On Sun, 24 Jan 2016 13:18:26 +0100, you wrote: ... >On 01/23/2016 06:41 AM, David davidwhess@... [TekScopes] wrote: >> 1. Does the readout intensity control also operate backwards? > >The

Thanks Tothwolf, files received. I know what you mean about the toner refilling. I found out the hard way about thoroughly cleaning the cartridge. I got a kit online years ago and the instructions

Hi David, This is nasty, you comment on a response by Marian but that response does not appear at the Tekscopes website. Some minor remarks here on your last comments: I calculate it at 16 V, never

I am new to the group and just purchased my first tek scope..My first scope was a BK Percsion 2120 that need work but has gotten worst over the years and have really tired of playing with it and got a

Hello-- On the off-chance that someone out there might still be running one of those Esterline Angus chart recorders that uses type 8510 ink-syphoning pens, I'm offering a batch of six new/unused pen

I have a Tek 2215 not 2215A scope coming and it needs some work .. The power button is stuck on and the handle will not lock into place because there's a few plastic knobs broke off or bent.Are these