083730510A DCN8172
Teledyne API T500U CAPS NO
2
Analyzer with NumaView™ Software
107
C
ONTROL
I
NPUTS
The control input bits can be tested by applying a trigger voltage to an input and watching
changes in the status of the associated function in the Utilities>Diagnostics menu:
EXAMPLE: to test the “A” and “B” control inputs:
1. Under the Utilities> Diagnostics>Digital Inputs menu, scroll through the signals
to find Ext Zero Cal.
2. Connect a jumper from the “+” pin on the appropriate connector to the “U” on
the same connector.
3. Connect a second jumper from the “
” pin on the connector to the “A” pin.
4. The status of Ext Zero Cal should change to read “ON”.
5. Connect a second jumper from the “
” pin on the connector to the “B” pin.
6. The status of Ext High Span Cal should change to read “ON.”
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 (described next) occurs, contact
the factory.
For a complete failure, 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.
•
For a failure associated with the DOM, the analyzer could stop during initialization
(the front panel display shows a fault or warning message), a likely indicator that the
DOM, the firmware or the configuration and data files have been corrupted.
RS-232 COMMUNICATIONS
G
ENERAL
RS-232
T
ROUBLESHOOTING
Teledyne API's analyzers use the RS-232 communications protocol to allow the instrument
to be connected to a variety of computer-based equipment. Problems with RS-232
connections usually center around five general areas:
•
Incorrect cabling and connectors. See Section 2.3.1.7 under RS-232 Connection for
connector and pin-out information.
•
The BAUD rate and protocol are incorrectly configured. See Section 2.3.1.7 under
•
If a modem is being used, additional configuration and wiring rules must be observed.
See Sections 3.1 and 3.2.
•
Incorrect setting of the DTE – DCE Switch. See Section 3.1 to set correctly.
•
Possible improper/incomplete seating of the cable (P/N 03596) that connects the
serial COM ports of the CPU to J12 of the motherboard.
Summary of Contents for T500U
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