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post #1 of 25 (permalink) Old 10-11-2014, 12:38 PM Thread Starter
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Default Bummer!!

My Hitachi CW40 won't start up. Worked fine the last time I used it, about a week ago. Go to use it today. Nothing. Light comes on, breaker didn't trip. Never knew a little saw would have a small circuit board on it. And book doesn't include any electrical schematics.
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post #2 of 25 (permalink) Old 10-11-2014, 01:03 PM
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Definitely a bummer! Most places don't give schematics as they want you to take it to their service centers. Many times it's cheaper to buy new than to have it fixed.
Example: paid $150 for a Fujifilm camera and accessories. Focus went out. A camera shop said it would cost $100 to fix it- they knew what was wrong, according to the clerk. A new camera cost less than $100. Scrapped it.

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post #3 of 25 (permalink) Old 10-11-2014, 01:28 PM
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Light comes on... so getting power and the switch works.

Logiically, the next thing to check would be the brushes...

"Don't worry, I saw this work in a cartoon once."
"Usually learning skills and tooling involves a progression of logical steps."
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post #4 of 25 (permalink) Old 10-11-2014, 01:50 PM Thread Starter
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Brushes look good. Just a little wear on them. But should have plenty life. I do a little electrical on the machines I work on, lathes and mills. But most of them don't have speed control and circuit boards. So I'm a little lost on how to trouble shoot to find out what it is. Motor, circuit board or speed control. I know the switch is good and the overload it good and set. Getting 110 to the circuit board. And this is not what I'm sure of. I took the brushes out completely and put each leg of my meter one the contacts where the brushes come out of. Should I be getting 110V there? I'm getting like 30V, no matter where the speed control is set.
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post #5 of 25 (permalink) Old 10-11-2014, 02:14 PM
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Quote:
Originally Posted by N'awlins77 View Post
My Hitachi CW40 won't start up. Worked fine the last time I used it, about a week ago. Go to use it today. Nothing. Light comes on, breaker didn't trip. Never knew a little saw would have a small circuit board on it. And book doesn't include any electrical schematics.
suspect the on/off switch...
test for power in, power out, all the way to the motor...
unplug the saw and take the blade out of it before you start w/ the testing...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

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post #6 of 25 (permalink) Old 10-11-2014, 02:22 PM Thread Starter
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Stick, I know it's not the switch or the overload breaker. Both tested and in working order. I'm getting 110 to the controller circuit board, but only getting 30VAC at motor (with brushes removed). I got a feeling it's the circuit board, but not 100%. I found one at an after market parts website for 80 bucks. I'm tempted to try. The saw cost me around 200-250 at Lowes, around 5 or 6 years ago. So I know that's almost half the price of the saw. But I really REALLY like this saw! And Hitachi doesn't make scroll saws any longer.
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post #7 of 25 (permalink) Old 10-11-2014, 02:56 PM
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Can you bypass that board if it is speed control and go to an external ?

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #8 of 25 (permalink) Old 10-11-2014, 06:10 PM Thread Starter
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I don't know Charles. I see a red and black going to the motor and two yellows. The yellows come from that circuit board. I don't understand how they incorporate into the motor. It looks like all four go into the motor. I've a call into Hitachi. But since they discontinued this line (scroll saws) I don't know how much help they will be. Guess I'll wait and see before I make things worst!! ;o)
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post #9 of 25 (permalink) Old 10-11-2014, 06:45 PM
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Hitachi probably won't be much help to you personally because of liability issues. I had that experience with an electric heater control with Honeywell. They wouldn't send me a schematic of the control because they didn't want me working on it. They might be helpful to a repair shop though.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #10 of 25 (permalink) Old 10-11-2014, 09:26 PM
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Here is a shot in the dark... Red and Black are power to motor, the yellows are a feedback loop. Just a guess, Lee.

I have found that hand tools are the best choice when I want to make mistakes at a slower rate of speed.

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