Alesis ADAT-XT manual Automatic Brake Calibration Procedure

Appendix D: Specifications

Er 7	Clean Heads: If this error message is seen, it may indicate that the heads
	are in need of cleaning. See page 75 for information about cleaning your
	heads.
Er 8	Sync Lost: Error message 8 normally occurs when the tape reaches the end
	while formatting or recording. It is caused by the fact that the XT cannot read
	timing data from the leader. The error is caused by the unit losing sync. If
	the unit is being run in the slave mode check the sync cable connection. It is
	recommended that only shielded and grounded cables be used as sync
	cables.
Er 9	Take-up Reel. This error indicates that the take-up reel didn’t move after
	PLAY or RECORD was engaged. This can spool tape out of the cassette, so
	the XT stops the tape immediately. It’s possible that the take up reel of the
	tape is jammed; try a blank or unimportant tape to see if the error recurs.
	The idler wheel that turns the take-up reel may need cleaning or
	replacement.
no 9ood tc	No Time Code. The XT is reading control track pulses, but no helical scan
	time code. Usually, a video tape has been inserted into the XT. Format the
	tape in the ADAT format.
	(Error 10 through 13 and 16 are not used)
Error 14-15	Crossfade buffer, state or channel error. This indicates a problem with the
	RAM buffer used for crossfading. Reinitialize the XT using the procedure on
	p. 75. If the problem recurs, the unit must be serviced.
Error 17	End sensor error. One of the optical sensors used to detect the clear leader
	at the head and tail of the tape cartridge is not working or is blocked
	temporarily. If the error recurs on other tapes, the unit needs to be serviced.
CAL PG	This error message may appear when you turn on power to the XT. If the
	display also reads "CAL brAC", there may be something wrong with the
	battery backup of RAM, or the RAM was accidentally scrambled. If no other
	error messages occur during operation, and the Interpolation Indicator (see
	p. 34) is not flashing, playback and recording are still possible. However, do
	not format any blank tapes on the XT until the PG is reset .
CAL brAc	If this message appears during the turn-on cycle, the brake settings have
	been set to the default settings due to a problem with RAM memory or the
	backup battery. Perform the automatic brake calibration (see below). If this
	message appears in the midst of normal operation more than once in every
	ten hours of operation, perform the automatic brake calibration (see
	"Automatic Brake Calibration Procedure", below).

Automatic Brake Calibration Procedure

If the "CAL brAc" error message appears, the internal braking system of the XT may need to be adjusted. The intelligent transport software is capable of calibrating the XT's brakes automatically in a self-test procedure. This procedure may be performed as a regular maintenance procedure every 250 hours of head drum operation (to see the hours on your unit, hold SET LOCATE and press FAST FORWARD).

1.Obtain a standard ST-126 length tape (preferably an Ampex 489 such as that was shipped with your unit) that has already been completely formatted from beginning to end. Use a non-essential tape (i.e., don't insert your only copy of a master tape). Do not use other lengths of tape such as ST-180 or ST-60.

82 ADAT XT Reference Manual