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Troubleshooting
This section contains information to help you diagnose system problems. Instructions are included for replacing CPU
and Power Supply boards in the event of a hardware failure and for installing a software upgrade. Also, the location and
use of the neuron service switch is discussed.
At the end of this section you will find a list of specifications for the TLS-IB.
Replacing the CPU Board
The CPU board must be replaced if the TLS-IB fails to communicate. Check the voltage between the GND and 5V test
points [Figure 29] on the back of the CPU board. This voltage should be between 4.75 - 5.25 Vdc; if not, replace CPU
board as follows.
1. Turn Off power to the system. Attach the anti-static strap to your wrist and to a good ground.
2. Disconnect the CPU cable from the Power Supply board. The CPU board snaps securely into place in the door of the
TLS-IB without the use of screws. There are two tabs on the top of the board that fit into two slots in the top edge of
the door. The bottom of the CPU board snaps in place between two pairs of detents protruding from the bottom edge
of the door. The CPU board is removed by inserting a straight-slot screwdriver into one of the two indents on the
bottom of the board and then gently prying against the door until the board clears the upper detents, then rotating the
board up slightly and toward you to clear the top tabs from the slots in the door.
3. Replace the CPU board reversing the above steps.
Figure 29. TLS-IB CPU board
OFF
C23
+
Y2
U5
U29
NODE
ADDRESS
Y3
L1
5V
TLS-IB CPU BOARD
Cable to Power
Supply Board
tlsnt\ibcpu.eps
PROM chip (U29)
Serial Comm/IFSF
Node Address
Dip Switch (S1)
IFSF ROM
(U5)
S1
G
8V
These voltage test points are on the back of
the CPU board (directly behind this upper left
corner)
STATIC SENSITIVE COMPONENTS!
WEAR GROUNDED ANTI-STATIC WRIST
STRAP BEFORE HANDLING THIS BOARD!
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OPEN