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Remove case from MN 2000
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Ok I will bite. How do you remove the case from an MN 2000 antenna tuner. There seems to be screws near the feet but of course they don't come out. 2 screws on the bottom and 4 sheet metal screws on the front panel.? How do I get the case off to tighten the feet screws and check the inside before using it? It is built like a tank.
73? Bob K6OXN |
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开云体育BobDo not remove the front panel screws! Put the feet back on their screws. Not going to be easy now but you should try and get the feet started on the thread, then pull on it to keep the screw from rotating and finger tighten the feet as much as you can. Remove any other screws in the bottom of the cabinet. Six as I recall??? Push the front panel towards the ?rear and remove the tuner box as one unit though this is typically quite tight. If someone has not used the original screws on the inner cover this can be REALLY tough! You will hear some scraping. If the top, bottom, or sides have been compressed inwards, this will also complicate removal of the inner box. Try to straighten it as best you can. Good luck! 73 Peter VE7PS? On May 7, 2023, at 6:54 PM, K6OXN Bob <bobk6oxn@...> wrote:
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开云体育Bob….just thought of something else. ?There should be a rolled lip around the edge of the front of the outer cabinet. ?Wonder if someone put it in backwards?????The rear of the cabinet has NO rolled edge like all other 4-line cabinets. 73 Peter VE7PS On May 7, 2023, at 6:54 PM, K6OXN Bob <bobk6oxn@...> wrote:
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开云体育Correction… not ALL 4-line boxes have ONE rolled edge on the front of the cabinet as rcvrs an txs have rolled edges front and back. ?The MN-2000, MN-4, CC-1, C-4, W-4, and WV-4 all have rolled edges on the front only. The front panel and guts slide in from the rear on those.Sorry for any confusion. 73 Peter VE7PS? On May 7, 2023, at 7:20 PM, VE7PS via groups.io <ve7ps@...> wrote:
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Well after a lot of trials and errors, I found that whomever placed it back in the cover put it on with the 4 outside screws for the case already installed. This is what was making it very difficult to remove the cover. After some prying and cussing, I got the case off out the back, by placing a short coax patch cable on the ALT and the Xmtr? so239's and pulling on the unit with a grip on the case. It looks completely clean inside and not an arc or anything obvious.
Serial Number is 955 don't know how many were made, but compared to the schematic I have it appears to be one of the first series. 73? Bob K6OXN |
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Bob: Glad you got it out.? The MN-2000 and MN-4 can be a bear to remove from the cabinet.? Same with the C-4 console, especially if someone has replaced the inner cover screws with round head screws, or screws with damaged?heads. Per WB4HFN's serial number database the MN-2000 was made from at least 1968 to 1978 with over 10,000 units produced.? They are quite common to find at fleamarkets here in Canada, usually for about $200-$250. In Version 2, Drake made a slight change to the wattmeter calibration circuit.? In version?1, it looks like you had to calibrate the 200w scale first, then the 2000w scale, in that order.? In version 2, the calibrations of the two scales should be independent.? A simple wiring change would correct version 1 if you wanted to do that.??I have not checked?for other changes between the two versions. 73 Peter VE7PS On Sun, May 7, 2023 at 9:10?PM K6OXN Bob <bobk6oxn@...> wrote: And yes it is built like a sherman tank |
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