8-5
Displays Indicating Trouble
U
(flashing)
LINK not present (card missing). If the flashing U is being displayed,
check for incompletely inserted cards. All cards should be fully
seated for proper operation.
b
Loading Baseline code—Main system code defective or incomplete
The codes listed below indicate problems with individual software modules. These codes
are displayed by showing each letter in sequence and repeating as in “H-E-L-P-2-
H-E-L….”
HELP0
Second stage loader not found
HELP1
Missing Baseline FRED module
HELP2
Selected module not found in ROM
HELP3
Selected module fails checksum
HELP4
Selected module not in directory
HELP5
Baseline FRED module fails checksum
Any other display
Indicates failure of the FRED Card.
8.3
Determining Software Revision Numbers
The System Services Card (Cat. No. 673) in slot 15 has a rotary switch (SW1) located
directly under the alphanumeric display which allows the DA20 to be switched into
various test modes used in manufacture and test. The switch should be set to “0” for
normal operation.
Each of the cards in the DA2O has its own piece of software, called a module. Sometimes
it will be necessary to determine what the revision number is for each of these software
modules.
To do this:
1. First start the system normally. Be sure that the Cat. No. 673 test mode switch is
set to position “0” before you apply power to the system. It is not necessary to
have film running, although this operation can be done with film playing
without affecting system operation.
2. Set the Cat. No. 673 test mode switch to position 2.
3. Return the switch to position 1. Write down the reading on the alphanumeric
display. This is the rev number for the Video Front End code.
4. Set the switch to position 2. Write down the reading on the alphanumeric
display. This is the rev number for the AC3 code.
5. Set the switch to position 3. Write down the reading on the alphanumeric
display. This is the rev number for the System Services code.
