No beam · laser and power

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• Power reads normal and nothing comes out. Check the spot-shot parameter first — the source will not emit unless the pulse frequency is set correctly.
  Original record

  检查点射参数的设置，只有在合适的参数下才能出光。推荐点射脉冲频率

• Parameters and configuration all check out and it still will not emit. Take a multimeter to the PWM and DA outputs on the adapter board. P+/P- carry PWM: with DIP 1 up and 2 down, 100% PWM is 22 V and 50% is 11 V; with DIP 1 down and 2 up, 100% is 4 V and 50% is 2 V, and so on. D1 and D2 carry DA1 and DA2. The value shown in the control-card monitor must match what you measure — if it does not, compare the reading with the cable connected and disconnected to localise the fault.
  Original record

  确认过参数和配置都正常后，如果还是无法出光，请拿出万用表测量转接板上的PWM输出信号和对应的DA输出信号。其中，P+和P-对应PWM输出信号，拨码1上2下时，100%的PWM信号对应的正常电压是22V，50%对应11V，依次类推。拨码1下2上时，100%的PWM信号对应4V，50%的PWM信号对应2V，依次类推。D1、D2分别对应的是DA1和DA2信号。控制卡监控显示值与实际测量值应该一致。如测量电压有问题，可以通过对比接线和不接线时候的测量电压值来排查问题。

• Everything above checks out and the shutter still will not open — this is beyond the machine builder; escalate to the laser manufacturer.
  Original record

  如上述都检查设置正确还是无法打开光闸，请和IPG厂商联系。

• The source emits even when no PWM modulation signal is present. That is a laser-side fault — have the laser vendor look at it.
  Original record

  在未收到pwm调制信号的情况下也会出光，请联系激光器厂家排查问题。

• The laser never sees the adapter board's output signal. Check the signal wiring for poor contact; if it still fails, contact the laser vendor.
  Original record

  可以判断是激光器无法接受到转接板的输出信号。请检查信号的传输线路是否有接触不良，如无法解决问题，请联系IPG厂商。

• If nothing else clears it, try a 1 kOhm resistor wired in parallel across P+ and P-.
  Original record

  如无法解决，可以尝试在p+和p-之间并联接一个1000欧的电阻。

• External interference is corrupting the modulation signal the laser receives — inspect the modulation signal cable.
  Original record

  可能是外部干扰导致激光器接收的调制信号被影响，请检查激光器的调制信号线是否良好

• On YLS sources an indicator lamp confirms the shutter has actually opened — use it to separate a control fault from a shutter fault.
  Original record

  对应YLS激光器有指示灯提示光闸已打开。

• Newer sources may have changed their timing. Prefer network-communication control over the hardwired interface when retrofitting.
  Original record

  如果是新款激光器，可能存在时序上的变动，推荐使用网络通讯控制方式。

• Beam drops out or a cut is skipped occasionally during a job — work back through the interlock, shutter and modulation chain rather than touching process parameters.
  Original record

  加工过程中偶尔出现断光或者漏切