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Laser diode failure [error 05208] or invalid beam-pointing signal level [error 04413]

Product

  

Thermal 3 head

Error

  
  • [05208] Laser Diode: Failure controlling the WLC
  • [04413] Beam-Pointing: The beam-pointing signal level is invalid

Symptoms

  

These errors may occur when you are unable to turn the laser on or when you see a poor result from the script I_vs_P.spt.

Use the following procedure when:

  • Determining the general health of aging laser diodes
  • Experiencing catastrophic failure of laser diodes
  • Determining the general health of individual diodes relative to each other

Cause

  

One of the lasers is dead or weak.

Solution

  
  1. At the TH3 prompt, type TH3>>ldd current a 45
  2. Type TH3>>ldd info
  3. Look for the output power for LDD A.
  4. At the TH3 prompt, type TH3>>ldd off
  5. Type TH3>> ldd current b 45
  6. Type TH3>>ldd info
  7. Look for the output power for LDD B.
  8. At the TH3 prompt, type TH3>>ldd off
  9. Look at the power output of each laser (LDD A and B).
    Result Action
    The power output for the diode is similar to the given current input. The diodes are fully functional.
    The power output for both diodes is low or they are significantly different from each other. For example, the difference between A and B is greater than than 6.0 watts. The diodes may not be able to maintain the imaging output specified for the head. In this case, upgrade to TH3 firmware version 1.04.06 or greater. The difference in output may get smaller or return to normal.
    The power output is zero watts for one or both. Use the parameter LDD laser mode to adjust the mode so the customer can continue imaging. A new head may be required if the imaging speed is out of the device specification.

    See the sample readouts below.

Sample readout: both lasers are good

In this example, both lasers are similar at approximately 23 watts output for 45 amps input. In some cases, where the LDD has failed completely, the power output may be zero.

The output power for LDD A is LDD: Laser Power=23.0735 Watts. For LDD B it is LDD: Laser Power=23.1837 Watts.

Sample readout

TH3 > ldd current a 45
LDD: Enabling the WLC required 2 ms!
*** Command Success ***
TH3 > ldd info
LDD: Control Mode=Current
LDD: Control State=Current
LDD: Laser Mode=A
LDD: Laser Power=23.0735 Watts
LDD: Laser Setpoint A=45 Amps
LDD: Laser Current A=44.6894 Amps
LDD: Laser Temperature A=22.4371 C
LDD: Laser On Time A=20.6125 Hours
LDD: Laser Setpoint B=0 Amps
LDD: Laser Current B=0.0697545 Amps
LDD: Laser Temperature B=20.1007 C
LDD: Laser On Time B=20.5153 Hours
*** Command Success ***

TH3 > ldd off
LDD: Disabling the WLC required 8 ms!
*** Command Success ***
LDD: Laser on time updated ( A=20.6393 hours )
LDD: Laser on time updated ( B=20.5153 hours )

TH3 > ldd current b 45
LDD: Enabling the WLC required 2 ms!
*** Command Success ***
ldd info
TH3 > ldd info
LDD: Control Mode=Current
LDD: Control State=Current
LDD: Laser Mode=B
LDD: Laser Power=23.1837 Watts
LDD: Laser Setpoint A=0 Amps
LDD: Laser Current A=0.0465030 Amps
LDD: Laser Temperature A=20.6294 C
LDD: Laser On Time A=20.6393 Hours
LDD: Laser Setpoint B=45 Amps
LDD: Laser Current B=44.6894 Amps
LDD: Laser Temperature B=20.9598 C
LDD: Laser On Time B=20.5153 Hours
*** Command Success ***

TH3 > ldd off
LDD: Disabling the WLC required 9 ms!
*** Command Success ***
LDD: Laser on time updated ( A=20.6393 hours )
LDD: Laser on time updated ( B=20.5265 hours )

Sample readout: one laser is dead/low

In this example, laser B is not working.

Sample readout

TH3 > ldd current a 45
*** Command Success ***

ldd info
TH3 > ldd info
LDD: Control Mode=Current
LDD: Control State=Current
LDD: Laser Mode=A
LDD: Laser Power=23.4712 Watts
LDD: Laser Setpoint A=45 Amps
LDD: Laser Current A=44.8521 Amps
LDD: Laser Temperature A=22.0178 C
LDD: Laser On Time A=110.732 Hours
LDD: Laser Setpoint B=0 Amps
LDD: Laser Current B=1.11607 Amps
LDD: Laser Temperature B=19.1754 C
LDD: Laser On Time B=89.5277 Hours
*** Command Success ***

ldd off
TH3 > ldd off
LDD: Disabling the WLC required 9 ms!
*** Command Success ***
LDD: Laser on time updated ( A=110.747 hours )
LDD: Laser on time updated ( B=89.5277 hours )
ldd current b 45
TH3 > ldd current b 45
LDD: Enabling the WLC required 2 ms!
*** Command Success ***

ldd info
TH3 > ldd info
LDD: Control Mode=Current
LDD: Control State=Detect
LDD: Laser Mode=B
LDD: Laser Power=-0.000353390 Watts
LDD: Laser Setpoint A=0 Amps
LDD: Laser Current A=1.25558 Amps
LDD: Laser Temperature A=20.1228 C
LDD: Laser On Time A=110.747 Hours
LDD: Laser Setpoint B=12.6693 Amps
LDD: Laser Current B=12.3465 Amps
LDD: Laser Temperature B=19.1974 C
LDD: Laser On Time B=89.5277 Hours
*** Command Success ***

[04413] Beam-Pointing: The beam-pointing signal level is invalid
LDD: Disabling the WLC required 1 ms!
LDD: The control state machine failed, error [05211]
[05211] Laser Diode: Timeout waiting for the write laser to be detected
LDD: Disabling the WLC required 0 ms!
LDD: Laser on time updated ( A=110.747 hours )
LDD: Laser on time updated ( B=89.529 hours )
ldd off
TH3 > ldd off
LDD: Disabling the WLC required 0 ms!
*** Command Success ***
Technical contact(s)
  

Kurt Shelton
Submitted by
  

Kurt Shelton
Date submitted
  

10 Apr 2007

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