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  1. #1
    Join Date
    Jun 2009
    Posts
    9

    Default Syncwave 250 HF help

    Guys,

    I need some help with my Syncrowave 250. Its a 2000 model with low hours on it.

    Earlier this week it was working fine. Tonight I went out to weld some aluminum, set the output to AC and the HF to continuous, stepped on the pedal and got nothing.

    Switched over to DC and HF start, but HF start didn't work. It will hold an arc when scratch started.

    Dressed the tungsten HF electrodes and reset the gap at 0.008in. Now I can get momentary HF but it won't stay on.

    Exercised the HF strength knob a few times but didn't help so I pulled the covers and blew the machine out with compressed air.

    If I wait 30 seconds the HF circuit will run for about 5 seconds and then dwindle out. Let the pedal up and wait 30 seconds and get 5 more seconds of HF.

    Nothing inside the machine "looks" wrong, there was only minor dust build up in the machine, hardly enough to blow out.

    Thoughts or suggestions on how to get the HF working again?

    Thanks,
    -Rob

  2. #2
    Join Date
    Jun 2009
    Posts
    9

    Default

    Nobody has any suggestions?

    I am questioning the HF capacitor. Anybody know how to test its function?

  3. #3
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,832

    Default

    Have you checked the preflow setting? One time it got moved on mine & wouldn't start an arc until after the set time. Took awhile to realize it.
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

  4. #4
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,832

    Default

    I assume you checked all the connections, especially the ground/work clamp?
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

  5. #5
    Join Date
    Jun 2009
    Posts
    9

    Default

    Thank you for taking the time to reply. Unfortunately I don't even get HF at the HF points.

    I have also checked that the breaker isn't tripped for the 110V circuit.

  6. #6
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,617

    Default

    And what would that serial # be.....

    Jusr cause you say its a 2000 there is a problem with the 2001 units...

  7. #7
    Join Date
    Jun 2009
    Posts
    9

    Default

    Thanks Cruizer,

    This is a LA219533, there is a sticker on the back side of the front panel that reads "TESTED BY TIG #AUG 04 2000".

  8. #8
    Join Date
    Jun 2009
    Posts
    9

    Default

    Tonight I checked for voltage input to the HF coil, I have 118v when stepping on the pedal and 5.x v when off the pedal. This seems to indicate that the control circuit isn't fried.

    I have read that I can't check the output of the HF coil without a special meter so I didn't try.

    I read a post on the interwebs by somebody who said they were a Miller tech, the post said that if you disconnected the HF capacitor you should get a 3000v spark but it wouldn't be enough to weld with. I tried that but still no HF at the points.

    Any thoughts?

  9. #9
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,617

    Default

    Ocillator Capacitor or more likely secondary side of the HF transformer is pooched.

  10. #10
    Join Date
    Jun 2009
    Posts
    9

    Default Issue resolved

    Followup post - Turns out that the fiberglass board that the tungsten points are screwed to inside the welder absorbed some moisture. the points were shorting into the fiberglass board!

    My 1975 Miller Econotwin had a ceramic board that I swapped out for the Syncrowaves fiberglass- problem solved!

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