Unable to do a stroke cal

Troubleshooting Tip | Laser Problems | BPD Errors | LDD Errors | LV Errors | BBS Errors

Troubleshooting Tip

If a TH2 head is experiencing problems while trying to beam balance, it does not necessarily mean that the BBS sensor or subsystem is at fault. Laser profile and beam position problems may be reflected in a failure to do a stroke cal. The best way to identify the fault is to set all subsystems involved in the stroke cal process to verbose, then try the stroke cal again and observe the resulting error. The subsystems invlolved are BPD, LDD, LVD and BBS.

Once you have a better idea of which subsystem may be causing the problem, use the procedure below to test that subsystem. Some of the most common causes of stroke cal failure are discussed in detail below.

Laser Problems

• Unable to do a stroke cal because of Laser Problems
• Also refer to LV errors

BPD Errors

• TH2: BPD Sensor Failure (Sensor Saturation)
• <Troubleshooting BPD Actuator Overcurrent (TH2 error 00405) - English

LDD Errors

• How to Run LDD Calibrate
• LDD profile has changed (microlens shifting)
• Numb end disease (NED)

LV Errors

• Stroke cal fails and hvtrim has a value of 0
• Troubleshooting a stuck pixel on a TH2 head (BBS error exceeds maximum error).
• LV is dirty
• See also Chopping pixels on a thermal 2 head.
• See also Pixel Chopping Calculator.

BBS Errors

• BBS sensor cable malfunction
• Testing the shutter on a thermal 2 head (BBS shutter stuck closed or open)