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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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#1
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wavetek waveform generator model 75 no response :-(((
Hey all,
Thanks in advance for any help on this. I'm a high school physics teacher and I came across this device in a surplus warehouse and I'm hoping to get it working if possible. It is a wavetek brand waveform generator model 75. the device turns on but the LED display panel is all black blocks and no digits. I've read the manual and tried the reset procedure of hitting setup 3 times, then f2 and then f3 but there is no response even during this process. I have measured the signal from all of the outputs and no response.. I really hope this is a common problem and is fixable, this would be a very meaningful device for my students in our classroom. has anyone had experience with this problem on this or a similar device before? thanks! dave |
#2
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wavetek waveform generator model 75 no response :-(((
David O'Dell wrote:
Hey all, Thanks in advance for any help on this. I'm a high school physics teacher and I came across this device in a surplus warehouse and I'm hoping to get it working if possible. It is a wavetek brand waveform generator model 75. the device turns on but the LED display panel is all black blocks and no digits. I've read the manual and tried the reset procedure of hitting setup 3 times, then f2 and then f3 but there is no response even during this process. I have measured the signal from all of the outputs and no response.. I really hope this is a common problem and is fixable, this would be a very meaningful device for my students in our classroom. has anyone had experience with this problem on this or a similar device before? thanks! There don't seem to be a service manual up front, I didn't fully look But what you describe sounds like bad caps, electrolytic types. Most likely from sitting around and one in a critical area dried out. Also, that unit could have a lithium cell in it for memory, some times they get bad enough to where they hold down the start up process of a diode isn't being used to isolate it. I would take it apart and look it over.. Jamie |
#3
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wavetek waveform generator model 75 no response :-(((
On Jun 3, 5:29*pm, "David O'Dell" wrote:
Hey all, Thanks in advance for any help on this. *I'm a high school physics teacher and I came across this device in a surplus warehouse and I'm hoping to get it working if possible. *It is a wavetek brand waveform generator model 75. the device turns on but the LED display panel is all black blocks and no digits. *I've read the manual and tried the reset procedure of hitting setup 3 times, then f2 and then f3 but there is no response even during this process. *I have measured the signal from all of the outputs and no response.. *I really hope this is a common problem and is fixable, this would be a very meaningful device for my students in our classroom. has anyone had experience with this problem on this or a similar device before? thanks! dave Do you have access to a voltmeter and an oscilloscope? I would contact the manufacturer and explain to them that you are a teacher and need some help in fixing one of their products for use in high school classes and see what they offer to do. Tell them even a schematic would help, but only if they don't seem very helpful. |
#4
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wavetek waveform generator model 75 no response :-(((
Jamie wrote: David O'Dell wrote: Hey all, Thanks in advance for any help on this. I'm a high school physics teacher and I came across this device in a surplus warehouse and I'm hoping to get it working if possible. It is a wavetek brand waveform generator model 75. the device turns on but the LED display panel is all black blocks and no digits. I've read the manual and tried the reset procedure of hitting setup 3 times, then f2 and then f3 but there is no response even during this process. I have measured the signal from all of the outputs and no response.. I really hope this is a common problem and is fixable, this would be a very meaningful device for my students in our classroom. has anyone had experience with this problem on this or a similar device before? thanks! There don't seem to be a service manual up front, I didn't fully look You didn't look at all. The first hit on Google provides the manual: http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&v ed=0CDAQFjAA&url=ftp%3A%2F%2Fftp.rowland.org%2Fpub %2FEE-Lab%2FManuals%2FWavetek%2F75%2F75_man.pdf&ei=mk6tU a-1D-PG0gH7j4DAAQ&usg=AFQjCNHdCoJ9IroYOycz0NhZm0mfz2lmG w&sig2=cGuZTADipaNmQQ3v82SRRw |
#5
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Wavetek Model 75 Arbitrary Waveform Generator, no response :-(((
David O'Dell wrote: Hey all, Thanks in advance for any help on this. I'm a high school physics teacher and I came across this device in a surplus warehouse and I'm hoping to get it working if possible. It is a wavetek brand waveform generator model 75. the device turns on but the LED display panel is all black blocks and no digits. I've read the manual and tried the reset procedure of hitting setup 3 times, then f2 and then f3 but there is no response even during this process. I have measured the signal from all of the outputs and no response.. I really hope this is a common problem and is fixable, this would be a very meaningful device for my students in our classroom. has anyone had experience with this problem on this or a similar device before? thanks! dave The manual shows a 16x2 LCD. (I posted a link to the service manual in a different message) BTW, it is Wavetek Model 75 Arbitrary Waveform Generator, which means you need to design the shape and amplitude you want at the output. From the manual I found online, it was built around 1985. The first thing I would do is look at the three outputs from the power supply. +5, +15 and -15 volts. Is it a simple linear power supply with a LM7805 three terminal regulator for the +5 VDC and a LM125 (or LM325A) IC regulator for the + & - 15 VDC supplies, so it will be easy to test & repair. It's also possible that the LCD has failed, due to age but most of these are generic parts. The unit is based on a 6303 MPU, which is the Hitachi version of the Motorola 6803. It has a 27C256 EPROM with the firmware, and a 64 Kb static RAM. It should be simple enough to troubleshoot. BTW, there is a newsgroup specifically for test equipment questions: news:sci.electronics.equipment |
#6
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wavetek waveform generator model 75 no response :-(((
David O'Dell wrote in message
... Hey all, Thanks in advance for any help on this. I'm a high school physics teacher and I came across this device in a surplus warehouse and I'm hoping to get it working if possible. It is a wavetek brand waveform generator model 75. the device turns on but the LED display panel is all black blocks and no digits. I've read the manual and tried the reset procedure of hitting setup 3 times, then f2 and then f3 but there is no response even during this process. I have measured the signal from all of the outputs and no response.. I really hope this is a common problem and is fixable, this would be a very meaningful device for my students in our classroom. has anyone had experience with this problem on this or a similar device before? thanks! dave +++++ My only Wavetek generator , of that era, repair experience, was a shorted 22uF tantalum on a power rail and so a "dead" machine |
#7
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wavetek waveform generator model 75 no response :-(((
"Michael A. Terrell" wrote in message m... Jamie wrote: David O'Dell wrote: Hey all, Thanks in advance for any help on this. I'm a high school physics teacher and I came across this device in a surplus warehouse and I'm hoping to get it working if possible. It is a wavetek brand waveform generator model 75. the device turns on but the LED display panel is all black blocks and no digits. I've read the manual and tried the reset procedure of hitting setup 3 times, then f2 and then f3 but there is no response even during this process. I have measured the signal from all of the outputs and no response.. I really hope this is a common problem and is fixable, this would be a very meaningful device for my students in our classroom. has anyone had experience with this problem on this or a similar device before? thanks! There don't seem to be a service manual up front, I didn't fully look You didn't look at all. The first hit on Google provides the manual: http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&v ed=0CDAQFjAA&url=ftp%3A%2F%2Fftp.rowland.org%2Fpub %2FEE-Lab%2FManuals%2FWavetek%2F75%2F75_man.pdf&ei=mk6tU a-1D-PG0gH7j4DAAQ&usg=AFQjCNHdCoJ9IroYOycz0NhZm0mfz2lmG w&sig2=cGuZTADipaNmQQ3v82SRRw Having had a look at the manual that Michael has kindly provided the link to, my very first step would be to check the main supply rails (+/-15v and 5v page 133 and 80 of the pdf) for level and noise, replace the lithium battery, followed by - if that doesn't restore it - examining the operation of the reset circuitry for the micro - see pages 4-14,15,16 (pdf 75 ++) and pdf page 120 for the schematic of that section Good luck with it. It looks a decent bit of equipment, functionally at least, and I'm sure that working, it would be a useful asset to your department. Arfa |
#8
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wavetek waveform generator model 75 no response :-(((
Hi
I've the same instrument. Mine doesn't lit up at all. Power supply is good but the problem should be in the logic circuit. I'm looking for the service manual but i can't find it anymore at rowland website linked by Michael. Have you downloaded a copy of the manual before that was deleted from site? In this case, can you send me a copy? |
#9
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wavetek waveform generator model 75 no response :-(((
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