On 18.10.17 21:33, mkoch583@gmail.com wrote:> On Tuesday, October 17, 2017 at 9:00:51 PM UTC-4, jurb...@gmail.com wrote: >> On most Teks with plugins if you unplug the vertical ones you should get a line across the screen. Just leave the horizontal in. Put it o auto. If that doesn't work switch it to external input. If that doesn't work remove the horizontal as well, which on some will result in a spot in the center of the screen. >> >> Also good test points are the deflection plates, which are usually on the sides of the neck of the CRT. You can tell the vertical ad horizontal pairs. The voltages should be close on each element of a pair but not necessarily pair to pair. >> >> Schematics are available on the net, if the voltages match but are all off from what the print says look to the power supply. Of course if removing any plugin restores the trace or spot, look at that first. >> >> It is a bit rough to measure the high voltage directly but there are telling test points, usually the focus control. Good luck with it. If it does turn out to be one of the plugins, they are available. They are not scrap prices yet so I guess there is a significant number of these old beasts that work. > > There are three plug-ins on this unit ( none of which are just horizontal or vertical ): curve tracer , dual trace amplifier supplying the channel 1 and channel 2 inputs , and a dual time base. I pulled the curve tracer. No dice. I swapped the dual trace amp with the dual time base. No good. I cleaned all of the terminals on the back of each plug in. I even pulled out all of the plug-ins. No luck. > There are no inputs on the main oscilloscope itself so I have to rely on the dual trace amp plug-in to input a signal. > I've downloaded a copy of the user and service manuals so I'm going to look it over. Thank you all for your time. > ( PS ) I also have a BK Precision scope that works well but it's only 10 MHz bandwidth. I really need the 100 MHz for rf work.The dual time base is horizontal, and the dual trace amplifier is (mostly) vertical. The curve tracer is probably both. -- -TV
Tektronix 7633 o'scope
Started by ●October 17, 2017
Reply by ●October 19, 20172017-10-19
Reply by ●October 19, 20172017-10-19
On Thursday, October 19, 2017 at 4:07:13 AM UTC-4, Tauno Voipio wrote:> On 18.10.17 21:33, mkoch583@gmail.com wrote: > > On Tuesday, October 17, 2017 at 9:00:51 PM UTC-4, jurb...@gmail.com wrote: > >> On most Teks with plugins if you unplug the vertical ones you should get a line across the screen. Just leave the horizontal in. Put it o auto. If that doesn't work switch it to external input. If that doesn't work remove the horizontal as well, which on some will result in a spot in the center of the screen. > >> > >> Also good test points are the deflection plates, which are usually on the sides of the neck of the CRT. You can tell the vertical ad horizontal pairs. The voltages should be close on each element of a pair but not necessarily pair to pair. > >> > >> Schematics are available on the net, if the voltages match but are all off from what the print says look to the power supply. Of course if removing any plugin restores the trace or spot, look at that first. > >> > >> It is a bit rough to measure the high voltage directly but there are telling test points, usually the focus control. Good luck with it. If it does turn out to be one of the plugins, they are available. They are not scrap prices yet so I guess there is a significant number of these old beasts that work. > > > > There are three plug-ins on this unit ( none of which are just horizontal or vertical ): curve tracer , dual trace amplifier supplying the channel 1 and channel 2 inputs , and a dual time base. I pulled the curve tracer. No dice. I swapped the dual trace amp with the dual time base. No good. I cleaned all of the terminals on the back of each plug in. I even pulled out all of the plug-ins. No luck. > > There are no inputs on the main oscilloscope itself so I have to rely on the dual trace amp plug-in to input a signal. > > I've downloaded a copy of the user and service manuals so I'm going to look it over. Thank you all for your time. > > ( PS ) I also have a BK Precision scope that works well but it's only 10 MHz bandwidth. I really need the 100 MHz for rf work. > > > The dual time base is horizontal, and the dual trace amplifier is > (mostly) vertical. The curve tracer is probably both. > > -- > > -TVThanks for the help. Very much appreciated.
Reply by ●October 21, 20172017-10-21
On Thursday, October 19, 2017 at 4:07:13 AM UTC-4, Tauno Voipio wrote:> On 18.10.17 21:33, mkoch583@gmail.com wrote: > > On Tuesday, October 17, 2017 at 9:00:51 PM UTC-4, jurb...@gmail.com wrote: > >> On most Teks with plugins if you unplug the vertical ones you should get a line across the screen. Just leave the horizontal in. Put it o auto. If that doesn't work switch it to external input. If that doesn't work remove the horizontal as well, which on some will result in a spot in the center of the screen. > >> > >> Also good test points are the deflection plates, which are usually on the sides of the neck of the CRT. You can tell the vertical ad horizontal pairs. The voltages should be close on each element of a pair but not necessarily pair to pair. > >> > >> Schematics are available on the net, if the voltages match but are all off from what the print says look to the power supply. Of course if removing any plugin restores the trace or spot, look at that first. > >> > >> It is a bit rough to measure the high voltage directly but there are telling test points, usually the focus control. Good luck with it. If it does turn out to be one of the plugins, they are available. They are not scrap prices yet so I guess there is a significant number of these old beasts that work. > > > > There are three plug-ins on this unit ( none of which are just horizontal or vertical ): curve tracer , dual trace amplifier supplying the channel 1 and channel 2 inputs , and a dual time base. I pulled the curve tracer. No dice. I swapped the dual trace amp with the dual time base. No good. I cleaned all of the terminals on the back of each plug in. I even pulled out all of the plug-ins. No luck. > > There are no inputs on the main oscilloscope itself so I have to rely on the dual trace amp plug-in to input a signal. > > I've downloaded a copy of the user and service manuals so I'm going to look it over. Thank you all for your time. > > ( PS ) I also have a BK Precision scope that works well but it's only 10 MHz bandwidth. I really need the 100 MHz for rf work. > > > The dual time base is horizontal, and the dual trace amplifier is > (mostly) vertical. The curve tracer is probably both. > > -- > > -TVOk group. Worked on the 7633 and replaced a fuse on the first board you see when you remove the back cover. This fixed a few things. I now can get a trace , the CRT is nice and clear , and the flash that occurred every 8-9 seconds has stopped. One problem left. The trace is vertical instead of horizontal. Still get a waveform from the function generator , but vertical. Why is that? Thanks for all your previous help. Mike
Reply by ●October 21, 20172017-10-21
On Sat, 21 Oct 2017 13:05:38 -0700, mkoch583 wrote:> Ok group. Worked on the 7633 and replaced a fuse on the first board you > see when you remove the back cover. This fixed a few things. I now can > get a trace , the CRT is nice and clear , and the flash that occurred > every 8-9 seconds has stopped. One problem left. The trace is > vertical instead of horizontal. Still get a waveform from the function > generator , but vertical. Why is that? Thanks for all your previous > help. > > MikeTry fiddling with the timebase controls. Some scopes (notably Philips) have exceptionally complicated timebase options. Can't recall what yours is off-hand, sorry. -- This message may be freely reproduced without limit or charge only via the Usenet protocol. Reproduction in whole or part through other protocols, whether for profit or not, is conditional upon a charge of GBP10.00 per reproduction. Publication in this manner via non-Usenet protocols constitutes acceptance of this condition.
Reply by ●October 22, 20172017-10-22
mkoch583@gmail.com wrote:> > Ok group. Worked on the 7633 and replaced a fuse on the first board you see when you remove the back cover. This fixed a few things. I now can get a trace , the CRT is nice and clear , and the flash that occurred every 8-9 seconds has stopped. One problem left. The trace is vertical instead of horizontal. Still get a waveform from the function generator , but vertical. Why is that? Thanks for all your previous help.Did you put the plugins back in their proper slots? The two left slots are for Vertical, the right slot is Horizontal for the timebase.
Reply by ●October 23, 20172017-10-23
On Sunday, October 22, 2017 at 8:40:23 AM UTC-4, Michael Terrell wrote:> mkoch583@gmail.com wrote: > > > > Ok group. Worked on the 7633 and replaced a fuse on the first board you see when you remove the back cover. This fixed a few things. I now can get a trace , the CRT is nice and clear , and the flash that occurred every 8-9 seconds has stopped. One problem left. The trace is vertical instead of horizontal. Still get a waveform from the function generator , but vertical. Why is that? Thanks for all your previous help. > > > Did you put the plugins back in their proper slots? The two left > slots are for Vertical, the right slot is Horizontal for the timebase.No Mike , I don't think the plug-ins are in those particular slots. I'll check and make the appropriate swaps. Does it matter if , in the two left slots , where the dual trace amplifier or the curve tracer go? Thanks
Reply by ●October 23, 20172017-10-23
On Mon, 23 Oct 2017 12:05:16 -0700 (PDT), mkoch583@gmail.com wrote:>On Sunday, October 22, 2017 at 8:40:23 AM UTC-4, Michael Terrell wrote: >> mkoch583@gmail.com wrote: >> > >> > Ok group. Worked on the 7633 and replaced a fuse on the first board you see when you remove the back cover. This fixed a few things. I now can get a trace , the CRT is nice and clear , and the flash that occurred every 8-9 seconds has stopped. One problem left. The trace is vertical instead of horizontal. Still get a waveform from the function generator , but vertical. Why is that? Thanks for all your previous help. >> >> >> Did you put the plugins back in their proper slots? The two left >> slots are for Vertical, the right slot is Horizontal for the timebase. > >No Mike , I don't think the plug-ins are in those particular slots. I'll check and make the appropriate swaps. Does it matter if , in the two left slots , where the dual trace amplifier or the curve tracer go? ThanksThe vertical amplifiers can go in either the left slot or the center slot. The horizontal amplifier has to go in the right slot, so if you have a curve tracer it has to go into the *right* two slots (it controls the horizontal and it controls the vertical ;-). If you have two vertical amplifiers, you can put them in the center and right slots and do X-Y. I believe a timebase will work in the center or left slot but it doesn't make much sense (the trace will be vertical).
Reply by ●October 24, 20172017-10-24
On Monday, October 23, 2017 at 8:12:33 PM UTC-4, k...@notreal.com wrote:> On Mon, 23 Oct 2017 12:05:16 -0700 (PDT), mkoch583@gmail.com wrote: > > >On Sunday, October 22, 2017 at 8:40:23 AM UTC-4, Michael Terrell wrote: > >> mkoch583@gmail.com wrote: > >> > > >> > Ok group. Worked on the 7633 and replaced a fuse on the first board you see when you remove the back cover. This fixed a few things. I now can get a trace , the CRT is nice and clear , and the flash that occurred every 8-9 seconds has stopped. One problem left. The trace is vertical instead of horizontal. Still get a waveform from the function generator , but vertical. Why is that? Thanks for all your previous help. > >> > >> > >> Did you put the plugins back in their proper slots? The two left > >> slots are for Vertical, the right slot is Horizontal for the timebase. > > > >No Mike , I don't think the plug-ins are in those particular slots. I'll check and make the appropriate swaps. Does it matter if , in the two left slots , where the dual trace amplifier or the curve tracer go? Thanks > > The vertical amplifiers can go in either the left slot or the center > slot. The horizontal amplifier has to go in the right slot, so if you > have a curve tracer it has to go into the *right* two slots (it > controls the horizontal and it controls the vertical ;-). > > If you have two vertical amplifiers, you can put them in the center > and right slots and do X-Y. I believe a timebase will work in the > center or left slot but it doesn't make much sense (the trace will be > vertical).Ok gentlemen , all is well at the AB8CQ workbench. The 7633 is percolating nicely after I put all the plug-ins in the right place. I'd like to thank all of you for your input and advice. I'll make sure to come back to this group in case I have any other issues. Thanks again. Mike
