Sir DaveNicko . . . . .
Am I correct in my
consumption that I have found the correct portion of the affected unit, in the respect of it being the braking unit with its related
solenoids working against the steel geared wheel for creating system braking action ?.
With the associated electronics aspect, being its variable adjustable power supply, feeding to those solenoids for mag braking.
The equiipments other portion that I saw and surmised an evaluation . . . . . seems to have been a generator type of electromechanical contriviance
that used adjustable loading to it, to maintain a variable / adjustable degree of restraint, for creating a physical workout to the biker.
RELEVANT R64 RESISTOR . . . . .
View attachment 46334
By my blow up, above.
That resistor looks like its having 2 copper caps with silver overplating, as you can see by the timely blackened AgO
2 onset. The resistor body core is being a ceramic bisque, blank rod.
Then it is having the connection to each cap of a nichrome resistance wire . . . . being
RED marked just beside them . . . . that has the bulk of the wire left intact on its "64" side. Considering that nichrome is being a quite tough and springy wire, it just might have compressed back towards that half, after burning open at its weakest point, from current overloading.
If you examine nearby, there is a white rectangular 1 amp time delay fuse marked as T1, it should be positioned / wired into the AC line input power on the "hot" side. Ohm it out as being a shorted circuit, if its being good and not blown.
I must waiver . . . without any further info or closer examination . . . . . as if your opened resistor might not have been inserted in circuit on the complete opposite side of the AC power cicuitry loop , being in line at the neutral side return of the power line.
There, the voltage developed across it is being relevant to the power consumption thru it, and that voltage level would be used as a control input for monitoring and for corrective power parameter shifting.
If that was my NUT to crack, I would see if I could get two test wire leads with their clips on each end, connected to the two end caps of the resistor. The leads other clip ends get connected to a DVM or even analog ohmmeter.
Then I use a set of small tweezers to see if I can manipulate the two burnt apart inner ends to touch just long enough to get an intact resistance reading, some scraping away of oxide may be needed at the nichrome inner wire tips.
One aspect of analysis, that you will presently be able to do, is to plug in your AC power cord in to the unit but NOT into the AC power line and then make one ohmmeter lead contact to one of the blades / pins of the male power plug and the other
ohmmeter lead is connected to one corner connection of the white F1 fuse. Is the ohmetter then confirming that there is a direct connection being made ?
If not , then try the other possibility of moving the ohmmeter lead to the OTHER pin of the male plug and do the same test to the fuse, with the other lead.
One of those connections should be directly connected to the fuse. THEN you will be able to use the OTHER unconnected male connection to receive the ohmmeter lead and then use the other ohmmeter lead to see if that connection is being made to either of the leads of the R64 problem resistor.
That test should reveal if the resisror is being conected to the "cold" side of the AC line as was earlier surmised..
If there is being no connection, then we just might expect that the R64 resistor is possibly being used at one end of another supply that is being an adjustable DC supply, being in the order of 24VDC that, is feeding those solenoid braking coils.
From an UL Underwriteres safety aspect, I can see that DC supply needing to be derived from a "cold " . . . . AC line isolated source . . . . . such as using a switch mode power supply with an ISOLATED secondary winding for producing that variable DC.
Can you give closeup pictures of that boards topside components, so that we can figure out what is REALLY being done, design wise ? Later on, the foil side, to see the wiring interconnects. The present pic only shows a portion of the top side.
View attachment 46335
73's de Edd . . . . .
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