Clarke CL300 Forward-Off-Reverse switch wiring problem.

[Derek ReayParticipant @derekreay29148]

I realize that there have been numerous Thread posts regarding the PCB wiring problems for the mini lathes, such as Clarke, Warco, Seig etc, but I seem to have a different problem. Before I and and a retired electrician friend of mine even start examining the PCB of a Clarke CL300 lathe it seems that we may have a problem with the F.O.R. switch. This switch looks identical to the C2-181 switch as sold by Arceurotrade. The PCB is the FC250J type.. Our particular switch has wires attached to 11 out of the 12 terminals. We have diconnected the PCB etc from the mains so it is not powered up at all and have checked the connection between each pair of terminals in the vertical 3 Terminal columns with an electrical Multimeter. This test being carried out as per the guidance troubleshooting info from the Little machine shop notes. However, this test was done with all wires still connected to the PCB, and there are some link wires also attached to some of the terminals. We get a continuation reading on one set/pair of Top and Bottom terminals in 1 vertical column. This reading is incorrect according to the Troubleshooting guide but we have not been able to find a wiring diagram which shows both the FOR switch and its connections to the PCB.. .Does anyone have such a wiring diagram/Schematic showing the wiring for all of the controls/ switches/ PCB connections. Any advice would be appreciated. Thank you.

[Derek ReayParticipant @derekreay29148]

[Anthony KnightsParticipant @anthonyknights16741]

If you go onto the Machine Mart website and search for CL300, you will go to the catalogue entry for that machine. There is a box to click on which loads the manual. Page 37 shows the wiring diagram, although the PCB number is different from the one you have given. Two of the changeover sets of contacts reverse the supply to the motor. One of the other contacts slows the motor down when in reverse. The C2-181 switch is a 4 pole change over switch with a centre OFF position and hopefully stops the motor before you change direction.

Best wishes. Anthony

Edited By Anthony Knights on 08/03/2023 10:03:19

[Derek ReayParticipant @derekreay29148]

Thank you Anthony for your advice re the wiring diagram. I had already seen that one, The diagram looks similar although the row in which there are only 2 wired terminals is in a different position, and is that a link wire between the F and R terminals . However, the 3way switch in my control panel not only has wires connected to 11 of the 12 terminals which all connect to other components, but there are also a number of short black wires which link one terminal to another. These links are connecting a Forward terminal to a Reverse one, with each connection being in a different vertical row, except for one link which is connected to F and R terminals in the same row. The soldering on each of the wires/terminals appear to be original. As these links are not clearly shown in the wiring diagram I am hoping that someone may be able to provide a schematic of their wiring, including the linking wires for the F.O.R. switch.

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