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Old 25th April 2012, 12:22 PM   #1
gcwills is offline gcwills  Australia
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Default Schematic for a Heath IO-4540???

Hi - can anyone assist with a schematic for a Heath IO-4540 oscilloscope? This unit was also sold under the Bell and Howell brand as a 10D-4540.

The Heath construction manual is a #9570 for this CRO.

If anyone can help, I'd really appreciate it
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Old 25th April 2012, 02:42 PM   #2
Simon B is offline Simon B  United Kingdom
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Nothing for Heath or Bell and Howell on BAMA, which is always worth checking, you might have some joy with this:

https://puck.nether.net/mailman/listinfo/heath
https://puck.nether.net/pipermail/heath/

I've no experience of them, but possibly worth a shot?
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Old 25th April 2012, 03:01 PM   #3
PChi is offline PChi  United Kingdom
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You have probaly found this site already Heathkit Schematic Diagram Archive
The closest model number is IO-4550
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Old 26th April 2012, 04:19 AM   #4
gcwills is offline gcwills  Australia
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Thanks guys for your help - yes I have found the other Heath models, but am yet to find a schematic for the 4540. Have registered with puck.nether.net - will see how that goes. Anyone else out there with the 4540 schematic??
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Old 26th April 2012, 07:18 AM   #5
Enzo is online now Enzo  United States
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Have you downloaded the 4550 to compare to your unit? If they are very similar, it may be enough. Even if they are quite different, it may be that the section of the unit you are servicing may be similar or the same as some other model. Many product lines have "family resemblance" within the model range.
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Old 26th April 2012, 07:26 AM   #6
gcwills is offline gcwills  Australia
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Thanks for your suggestion Enzo - I have downloaded the Heath 4105, 4205 and 4550 schematics and they all differ substantially from the 4540 - still hoping someone will have the 4540 schematic
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Old 28th April 2012, 04:32 PM   #7
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Good news and bad news. Good: I built that scope (Heathkit IO-4540 5MHz single-trace) as a teenager, and I still have both the scope and the manual, complete with schematic. Bad: I don't own a scanner, and even if I did, the schematic is a 31" x 20" single sheet. But I hung it on the wall and took a photo of each quadrant, and they're fairly readable at 100%. Hope it helps.
Attached Images
File Type: jpg IO4540_01_UpperLeft.jpg (881.2 KB, 99 views)
File Type: jpg IO4540_02_UpperRight.jpg (874.1 KB, 80 views)
File Type: jpg IO4540_03_LowerRight.jpg (928.3 KB, 75 views)
File Type: jpg IO4540_04_LowerLeft.jpg (877.1 KB, 74 views)
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Old 29th April 2012, 03:57 AM   #8
gcwills is offline gcwills  Australia
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Thanks! Really appreciate the time you took to post these photos - quite readable for service work and will work fine for me.
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Old 29th April 2012, 12:30 PM   #9
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Glad you found it useful. If you need anything else from the manual, let me know. Post, PM, email, etc.
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Old 10th June 2012, 12:17 AM   #10
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I copy the image as but it just a thumbnail. To you have the original jpg files I could download.

Thanks,
Dave
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