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Unresolved Another bed temperature issue

Discussion in 'Troubleshooting' started by Lew, Sep 3, 2016.

  1. Lew

    Lew Member

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    I have an early build Robo3D - no upgrades except for a replacement extruder. The printer has been fine until today. When preheating the bed, the temp climbs to something around 40 - 48 degrees than stops heating and starts cooling. I have the added fan over the controller. Despite the fan, the poly fuse for the bed gets quite hot. The added fan seems a bit sluggish. No errors are logged and the console shows:
    <-ok T:26.3 /0.0 B:49.5 /55.0 T0:26.3 /0.0 @:0 B@:127
    ->M105
    <-ok T:26.4 /0.0 B:49.4 /55.0 T0:26.4 /0.0 @:0 B@:127
    ->M105
    <-ok T:26.3 /0.0 B:49.2 /55.0 T0:26.3 /0.0 @:0 B@:127
    ->M105
    <-ok T:26.3 /0.0 B:48.9 /55.0 T0:26.3 /0.0 @:0 B@:127
    ->M105
    <-ok T:26.2 /0.0 B:48.7 /55.0 T0:26.2 /0.0 @:0 B@:127
    ->M105
    <-ok T:26.3 /0.0 B:48.7 /55.0 T0:26.3 /0.0 @:0 B@:127
    ->M105
    <-ok T:26.3 /0.0 B:48.4 /55.0 T0:26.3 /0.0 @:0 B@:127
    ->M105
    <-ok T:26.3 /0.0 B:48.2 /55.0 T0:26.3 /0.0 @:0 B@:127
    ->M105
    ... and so on until the bed reaches room temperature.
    Reheating the bed yields the same results - rises to around 48 degrees and drops.

    My feeling is it is the poly fuse, but can anyone suggest anything different? If it is the fuse, is there a replacement part number someone can suggest?

    Thanks,
    Lew Palmer
     
    #1 Lew, Sep 3, 2016
  2. Geof

    Geof Volunteer Moderator
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    Hi let, if that cooling fan is running well that fuse won't be that hot, that said a new ramps board is cheap enough that's where I'd start after verifying the fan is blowing on the ramps with good power.
     
    #2 Geof, Sep 3, 2016
  3. danzca6

    danzca6 Well-Known Member

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    #3 danzca6, Sep 4, 2016
    Geof and mark tomlinson like this.
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

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    That snippet of the console log does not have any errors. You must read the entire log if you wan to have any chance of finding the error :)

    It may be that there are not any. If so then it is likely the RAMPS board and they are (as @danzca6 mentioned) cheap. The original beta and the R1 can use a standard RAMPS 1.4 from anywhere. The R1+ needs a custom one from Robo (or you convert it as @Geof documented in a thread).
     
    #4 mark tomlinson, Sep 4, 2016
    Geof likes this.

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