Product

Thermal 2 head

Error

Symptoms

This is a rare situation. Only two cases have been identified in the field, so you should attempt to identify other possible problems first.

Normally it appears during laser on, or any time the bpd subsystem is turned on. For example:

TH2 > bpd mode on
*** Command Success ***
*** Unsolicited Message 37240 Recoverable Error
[Thermal:TEH2 error 00405, Beam-Pointing: The beam-pointing actuator is over current]

To diagnose this problem, look for the following behavior:

QUANTUM>> redirect enable
*** Command Complete
TH2 > eng
*** Command Success ***
TH2 > bpd mode on
*** Command Success ***
*** Unsolicited Message 37240 Recoverable Error
[Thermal:TEH2 error 00405, Beam-Pointing: The beam-pointing actuator is over current]

Solution

1. Record the values for the BPD constants. See the example below:
   
   TH2 > set bpd

   Key	Sub.	Parameter	Active	Default	Units
   -------------------------------------------
   [00400]	BPD	kp	1.0000	1.0000
   [00401]	BPD	ki	0.0500	0.0500
   [00402]	BPD	kd	0.1000	0.1000
   [00403]	BPD	beamposition	0	0
   [00404]	BPD	holdcurrent	100.000	100.000	mA
   [00405]	BPD	highgain	False	False

   *** Command Success ***
2. Contact the Response Center so that they can check these values against the factory values for the BPD constants. It is very unlikely, but the incorrect values could lead to this problem.
3. If the values for the BPD constants match the factory BPD values, the head will need to be replaced.

Technical contact(s)

Alvaro Ireta

Submitted by

Alvaro Ireta

Date submitted

27 Aug 2004