IM 689-2
47
Troubleshooting the SBC
The SBC may be defective if the SBC has 5 Vdc power, communications cannot be established with
any MicroTech controllers through the BACdrop gateway, and you have tried the suggestions above
in “Troubleshooting Communications Problems.” Use these additional troubleshooting guidelines:
•
Check the jumper settings on the SBC.
See the “Jumper Settings” section below.
•
Verify that the SBC has 5 Vdc power by observing the LEDs.
When you cycle power, one or more LEDs should flash or remain lit. See “
Troubleshooting
Power Problems
” above.
•
If the SBC has power but you do not hear at least one beep when it boots up, the SBC is probably
defective.
The problem could be associated with the speaker, the processor, or the flash memory chip. The
32-pin flash memory chip can be replaced in the field. If you have another BACdrop gateway,
you can try swapping flash chips to isolate the problem. Otherwise, you can try replacing the
flash chip or the entire SBC (see the “
Parts List
” section below).
The flash chip is easy to identify. It is the only 32-pin chip on the board (about 1.5 inches long),
and it should have a “Datalight” sticker on it. This sticker indicates that the chip contains a
licensed version of ROM-DOS.
Jumper Settings
Table 7 lists the proper jumper settings for the SBC. Figures 31 through 39 show the locations of the
jumper blocks on the SBC.
Table 7. Single Board Computer Jumpers
Jumper block
Set jumper across terminals
See Figure
J2
1-3
31
5-6
7-9
8-10
11-12
J3
None
32
J4
2-3
31
J5
1-2
33
J7
2-3
34
4-5
J8
3-5
34
J11
1-2
35
J12
1-2
35
J14
1-2
36
J17
None
37
J19
1-2
38
3-4
7-8
9-10
11-12
13-14
J21
7-8
36
9-10
11-12
J23
3-4
39
J25
2-3
37
