North Star DIMENSION Service Manual page 54

TROUBLESHOOTING
Boot Problems (cont.)
Symptom Explanation Solution
(continued)
A series of three flashes or four flashes are the
most useful , because they indicate where the
problem is located . A series of two flashes usually
indicates a defective 80186 . If the 80186 is labeled
S40050 or S40052 or has date codes 8321 or 8325,
replace it.
Note: If your central module contains a multi-layer
central board, you must remove the bus board in
order to read the label on the 80186.
3. The diskette drive LED turns on.
o Insert the DIMENSION DOS System Diskette #1
into the drive. (Have the diskette in your hand
before beginning this step.) If the LED turns off
before you insert the diskette, begin again. (In
some systems , the LED flashes once, goes out 1r0'
for approximately 10 seconds, then turns on. If
you have a system like this, wait for the LED to
turn on before inserting the diskette.)
4. The diskette drive LED flickers as the diskette is
read.
o If it doesn't, check that:
- The correct diskette is mounted
- The diskette is mounted correctly
- The drive lever is closed
2-8 DIMENSION Service Manual