Hi to all, and thank you for the responses. For some reason, they didn¡¯t appear in my email. Imran told me to check the website. Then I saw everything, and now it¡¯s also in my email.?
I have attached the wiring diagrams. ?I don¡¯t think this was part of a combination machine, though I¡¯m the third owner so I don¡¯t really know. It¡¯s only a saw. Years ago I disabled the brake, I forget why. But my history with occasional nonstarting mirrors Bill¡¯s and so I¡¯ll try what he did on his machine.?
Thanks for the help. Any other help is most welcome.?
Mike?
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On Jul 28, 2021, at 6:01 PM,
stuebgen2287@... wrote:
Mike, my trail of frustration parallels yours about a year earlier; no start, suction, compressed air, circle the machine opening and re-closing lock out switches, unplug the machine, wait and cuss. Sometimes it would start; but sometimes it wouldn¡¯t, finally completely dead. My machine is a 1998 BF-741, so 5 functions. The part numbers on the two relays shown in your second picture are exactly the same as mine. You remove the relay by pushing toward the switch on the round claw mechanism right under where Siemens is printed in the middle with a flat screwdriver. Here¡¯s how I solved my problem.
Disassembled switch plate for shaper, exposing the back of the switches, focusing attention on the ¡°ON¡± switch. Using a continuity tester, determined that the Siemens relay had failed (no continuity with switch button depressed or not). Contacted local electrical supplier for Siemens (Consolidated Electric Distributors here in Boise) to get replacement relay. I¡¯ll spare you the calls and trips, but eventually learned Siemens had redesigned the form factor for the relays and switch blocks a couple years earlier. I ordered one of each of the new style, which luckily were available and compatible with the switch. Inserted the new parts, and problem solved. Cost at this point was under $20.
As an aside, I also decided to replace the flat red "OFF" switch for the shaper with a mushroom emergency switch, with because of project urgency got swapped for the one on the J/P because of ordering delay. Now everything is working properly. Cost now about $75.
If you determine you need to replace the Siemens relay, make sure to get the exact match (depending on whether it's an "OFF" or "ON" switch, the relay needs to be NO-NC or NO-NO respectively [normally open/normally closed[). It's printed on the relay.
I'll admit to being electrically challenged, but this was easily completed. Hope your solution is as easy as mine, and this information helps; as they say, YMMV.
Bill Stuebgen
