Teledyne T803 - page 45

Teledyne API T803 CO2/O2 Analyzer Operation Manual Getting Started
43
ATTENTION COULD DAMAGE INSTRUMENT AND VOID WARRANTY
Printed Circuit Assemblies (PCAs) are sensitive to electro-static
discharges too small to be felt by the human nervous system. Failure to
use ESD protection when working with electronic assemblies will void
the instrument warranty. Refer to Section 13 for more information on
preventing ESD damage.
In each instrument with the Multidrop option there is a shunt jumpering two pins
on the serial Multidrop and LVDS printed circuit assembly (PCA), as shown in
Figure 3-14. This shunt must be removed from all instruments except that
designated as last in the multidrop chain, which must remain terminated. This
requires powering off and opening each instrument and making the following
adjustments:
1. With NO power to the instrument, remove its top cover and lay the rear
panel open for access to the Multidrop/LVDS PCA, which is seated on the
CPU.
2. On the Multidrop/LVDS PCA’s JP2 connector, remove the shunt that jumpers
Pins 21  22 as indicated in Figure 3-14. (Do this for all but the last
instrument in the chain where the shunt should remain at Pins 21  22).
3. Check that the following cable connections are made in all instruments
(again refer to Figure 3-14):
 J3 on the Multidrop/LVDS PCA to the CPU’s COM1 connector
(Note that the CPU’s COM2 connector is not used in Multidrop)
 J4 on the Multidrop/LVDS PCA to J12 on the motherboard
 J1 on the Multidrop/LVDS PCS to the front panel LCD
07276B DCN6418