Control Inputs - Remote Zero, Span; Cpu; Communications; General Rs-232 Troubleshooting - Teledyne T400 User Manual

5.7.10.3 CONTROL INPUTS – REMOTE ZERO, SPAN
To test the control inputs:
1. Jumper the +5 pin on the Status connector to the U on the Control In connector.
2. Connect a second jumper from the
3. Connect a second jumper from the
4. In each case, the analyzer should return to Sample Mode when the jumper is

5.7.11 CPU

There are two major types of CPU board failures, a complete failure and a failure
associated with the Disk On Module (DOM). If either of these failures occurs, contact the
factory.
For complete failures, assuming that the power supplies are operating properly and the
wiring is intact, the CPU is faulty if on power-on, the watchdog LED on the motherboard
is not flashing.
In some rare circumstances, this failure may be caused by a bad IC on the motherboard,
specifically U57, the large, 44 pin device on the lower right hand side of the board. If this
is true, removing U57 from its socket will allow the instrument to start up but the
measurements will be invalid.
If the analyzer stops during initialization (the front panel display shows a fault or warning
message), it is likely that the DOM, the firmware or the configuration and data files have
been corrupted.
5.7.12 RS-232 C
5.7.12.1

GENERAL RS-232 TROUBLESHOOTING

Teledyne API analyzers use the RS-232 communications protocol to allow the instrument
to be connected to a variety of computer-based equipment. RS-232 has been used for
many years and as equipment has become more advanced, connections between various
types of hardware have become increasingly difficult. Generally, every manufacturer
observes the signal and timing requirements of the protocol very carefully.
Problems with RS-232 connections usually center around the following general areas:
1. Incorrect cabling and connectors. See Section 2.3 for connector and pin-out
2. The BAUD rate and protocol are incorrectly configured. See Section 2.3.1.7 under
3. Incorrect setting of the DTE-DCE Switch. Ensure that switch is set correctly. See
4. Verify that the cable that connects the serial COM ports of the CPU to J12 of the
130
Control In connector. The instrument should switch from Sample Mode to ZERO
CAL R mode.
Control In connector. The instrument should switch from Sample Mode to SPAN
CAL R mode.
removed.
OMMUNICATIONS
information.
RS-232.
Section 3.1.
motherboard is properly seated.
Teledyne API – Model T400 O
_
pin on the Status connector to the A pin on the
_
pin on the Status connector to the B pin on the
Analyzer 083730400A DCN8130
3