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Fw: [hammondzone] X-77-Tonewheel Generator - BEARINGS - LUBRICATIONS - UPDATE-15FEB23 - switch problem?

Wayne Tarling All Messages By This Member #83147 Well, "guessing" the instructions as to which screws, etc., the entire top assembly comes right off very easily, exposing what needs to be exposed and the top metal cover, ditto. As it turns out, (as the experts already knew/know), these tabs/switches are all mechanical.? They were not meant to be disassembled (all rivetted together), and looking at how the entire tab assemblies have been manufactured, Hammond has considered the possibility that things might fail, and figure out ways for fixes to be done. The only thing I cannot "see" clearly is the slide contact which is sandwiched between the boards.? I am very reluctant to split this assembly apart. It may be far more logical to use a cleaner first and find out what the results will be.? ? Any thoughts from anyone? For the non-experts, here are photos of these tab/switch assemblies. and the suspected tab: ----- Forwarded Message ----- toggle quoted message Show quoted text From: Wayne Tarling <tarlingw@...> To: [email protected] <[email protected]> Sent: Tuesday, February 14, 2023 at 05:51:29?PM PST Subject: Fw: [hammondzone] X-77-Tonewheel Generator - BEARINGS - LUBRICATIONS - UPDATE-14FEB23 - switch problem? Well everything went reasonably well. TWG running very quiet.? Manuals functioning? ....pedals not. I opened up the console base panel, which had not been touched yet. I disconnected the 77 Leslie previously as it had too much power hum for the stage I was at. (Didn't need to be listening to it) a)? with the pedals not "responding", I thought I would try the "Pedal Bus-Bar Shifter".? It has a slot on the end of the shaft as if for a screwdriver, but I thought I would try turning with my fingers first.? To my surprise, the shaft moved very easily CW about 90°? and not so much CCW ....so I left it re-positioned 90° CW.? ? I tried the pedals ....no change.? ?I went back to the speaker selector, "Main Only" and "Echo Only", just moving the switches, and immediately had the pedals working with "Echo Only" depressed. (147)? I was quite surprised with this as this selector had been down previously with no response.? I went through all the pedals and drawbars and everything was working. b) I powered down to connect the 77 Leslie. Powering back up got the 8-10 seconds of power hum, which subsided more significantly this time and put the "Main Only" speaker selector down and had full pedals (77) ....but I couldn't tell if the 147 was still functioning.? Pushing the "Echo Only" tab down and found the 147 was now NOT working with the pedals. (It had been 20 seconds ago)? Keyboards were fine (both).? I ended up flicking this (Echo Only) switch up and down, getting mainly electrical contact clicking with no connection for the pedals.? (????) Unfortunately, looking at the back of the organ, the entire bank of these switches are buried behind a metal box running full length.? There are also a few screws on the top of this metal box, which can only be accessed with the top of the console removed. With much "playing around", I am getting to the summary that the "Echo Only" tab/switch (147) is either not making a proper contact for some reason ...perhaps just a cleaning needed?? The "Main Only" switch, when down, (77) the manuals and pedals function fine ...as they should.? I also note, that the power hum from the 77 Leslie is far less now. Pretty much quite acceptable ....as compared to the 147 which has a very too noticeable hum.? ?I see some notes on "HUM" on page 20 & 24 of the Hammond Manual.? I'll check that out later. Does anyone have any knowledge of accessibility to the "Echo Only" switch?? I cannot see in behind.?? I am looking at page 20 and 21 that reference "removing the top.? There is a section about removing the top: Is this the correct instruction?? I'll have to look around for each of these details, (where these screws are) assuming this is the correct instruction. Then of course, I am hoping this switch can be tested for "make" condition ....and then can the contacts be cleaned or fixed? ?.....or do I have this all wrong and there is something else causing this problem?? ?So far the problems have been principley mechanical in nature.
Chris Clifton All Messages By This Member #83148 开云体育 Those are the type of switch used in many Hammond models, E, L and M-100 series are the most common ones, and of course, your X-77. Switch cleaner is indeed the first course of action, and may well be sufficient to cure the problem. Don't even think about dismantling the switch assemblies, it shouldn't be necessary anyway. I have found that when switch cleaner doesn't work on these switches, it's usually because the moving leaf contact has bent slightly, and no longer presses hard enough against the fixed contact in the on position. I've found that by gently pressing the contact spring with a small screwdriver near the fixed end it's possible to bend the contact slightly and increase the contact pressure. I stress "gently", only a small bend is necessary, and it will be hard to undo if you over do it. On 15/02/2023 17:49, Wayne Tarling via groups.io wrote: toggle quoted message Show quoted text Well, "guessing" the instructions as to which screws, etc., the entire top assembly comes right off very easily, exposing what needs to be exposed and the top metal cover, ditto. As it turns out, (as the experts already knew/know), these tabs/switches are all mechanical.? They were not meant to be disassembled (all rivetted together), and looking at how the entire tab assemblies have been manufactured, Hammond has considered the possibility that things might fail, and figure out ways for fixes to be done. The only thing I cannot "see" clearly is the slide contact which is sandwiched between the boards.? I am very reluctant to split this assembly apart. It may be far more logical to use a cleaner first and find out what the results will be.? ? Any thoughts from anyone? For the non-experts, here are photos of these tab/switch assemblies. and the suspected tab: ----- Forwarded Message ----- From: Wayne Tarling <tarlingw@...> To: [email protected] <[email protected]> Sent: Tuesday, February 14, 2023 at 05:51:29?PM PST Subject: Fw: [hammondzone] X-77-Tonewheel Generator - BEARINGS - LUBRICATIONS - UPDATE-14FEB23 - switch problem? Well everything went reasonably well. TWG running very quiet.? Manuals functioning? ....pedals not. I opened up the console base panel, which had not been touched yet. I disconnected the 77 Leslie previously as it had too much power hum for the stage I was at. (Didn't need to be listening to it) a)? with the pedals not "responding", I thought I would try the "Pedal Bus-Bar Shifter".? It has a slot on the end of the shaft as if for a screwdriver, but I thought I would try turning with my fingers first.? To my surprise, the shaft moved very easily CW about 90°? and not so much CCW ....so I left it re-positioned 90° CW.? ? I tried the pedals ....no change.? ?I went back to the speaker selector, "Main Only" and "Echo Only", just moving the switches, and immediately had the pedals working with "Echo Only" depressed. (147)? I was quite surprised with this as this selector had been down previously with no response.? I went through all the pedals and drawbars and everything was working. b) I powered down to connect the 77 Leslie. Powering back up got the 8-10 seconds of power hum, which subsided more significantly this time and put the "Main Only" speaker selector down and had full pedals (77) ....but I couldn't tell if the 147 was still functioning.? Pushing the "Echo Only" tab down and found the 147 was now NOT working with the pedals. (It had been 20 seconds ago)? Keyboards were fine (both).? I ended up flicking this (Echo Only) switch up and down, getting mainly electrical contact clicking with no connection for the pedals.? (????) Unfortunately, looking at the back of the organ, the entire bank of these switches are buried behind a metal box running full length.? There are also a few screws on the top of this metal box, which can only be accessed with the top of the console removed. With much "playing around", I am getting to the summary that the "Echo Only" tab/switch (147) is either not making a proper contact for some reason ...perhaps just a cleaning needed?? The "Main Only" switch, when down, (77) the manuals and pedals function fine ...as they should.? I also note, that the power hum from the 77 Leslie is far less now. Pretty much quite acceptable ....as compared to the 147 which has a very too noticeable hum.? ?I see some notes on "HUM" on page 20 & 24 of the Hammond Manual.? I'll check that out later. Does anyone have any knowledge of accessibility to the "Echo Only" switch?? I cannot see in behind.?? I am looking at page 20 and 21 that reference "removing the top.? There is a section about removing the top: Is this the correct instruction?? I'll have to look around for each of these details, (where these screws are) assuming this is the correct instruction. Then of course, I am hoping this switch can be tested for "make" condition ....and then can the contacts be cleaned or fixed? ?.....or do I have this all wrong and there is something else causing this problem?? ?So far the problems have been principley mechanical in nature.

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