>>> 'tylan4' problem from evan -- Sat Jan 20 21:06:37 1990 <<<

The firing board failed on power restart after the building power was restored.
The center zone power resistor was burnt out. The board will be replaced on
Monday Jan 22.
tylan4 is down for the weekend.

>>> 'tylan4' problem from evan -- Tue Jan 23 15:48:54 1990 <<<

The burnt firing board was replaced with our spare but the center zone did
not start firing.  I will have to check out the scrs. tylan4 still down.

>>> 'tylan4' problem from evan -- Wed Mar  7 14:27:52 1990 <<<

replaced scr firing board. tube now fires in all zones.  no temp readout to
tycom (see tylan3 problem). repair will continue tomorrow.

>>> 'tylan4' problem from evan -- Fri Mar  9 09:38:02 1990 <<<

tylan4 is operating correctly after resetting everything. temp problem due
to work performed on tylan1 and bank1
tylan4 is up

>>> 'tylan4' problem from evan -- Wed Mar 14 09:32:42 1990 <<<

Removed the SCR assy for use in tylan1. 
tylan4 is down

>>> 'tylan4' problem from bob -- Thu Mar 22 13:35:05 1990 <<<

tylan4 is down for repair of it's power package. It will be down 
for several days while a new insulator is made.

>>> 'tylan4' fix from evan -- Thu Apr 12 13:11:45 1990 <<<

The rebuilt scr/transformer module has been reinstalled.
tylan4 is firing and temp stabilizing.

tylan4 is up

>>> 'tylan4' problem from evan -- Wed Apr 18 17:00:57 1990 <<<

I had to borrow the amp board to try in bank3.  It will be returned on
Thursday.
tylan4 is down until then.

>>> 'tylan4' fix from evan -- Thu Apr 19 09:31:45 1990 <<<

Amp board replaced in system.
tylan4 is up

>>> 'tylan4' fix from bob -- Wed May  9 13:55:19 1990 <<<

tylan4 has been reset and is running a calibration. It should be
complete by tomorow am.

>>> 'tylan4' problem from bob -- Fri May 11 09:37:34 1990 <<<

tylan4 is down until further notice. It has a problem with it's
slave cpu. Evan will investigate next week.

>>> 'tylan4' fix from evan -- Mon May 14 11:54:42 1990 <<<

problem: tube not loading recipe correctly after bank power failure.
solution: reseated CPU card. (this is the card that is very hard to insert).
         reset boards and tycom (to clear i/o error lockout) and loaded
         START4.  Tube is now firing correctly.

tylan4 is up
