General Troubleshooting & Service Teledyne API T703/T703U Calibrator Operation Manual
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To test the Control Output electronics:
1. Connect a jumper between the “E“ pin and the “” pin on the status output
connector.
2. Connect a 1000 ohm resistor between the “+” pin and the pin for the status
output that is being tested.
3. Connect a voltmeter between the “” pin and the pin of the output being
tested (see Table 8-12).
4. Under the DIAG> SIGNAL I/O menu (See Section8.1.3), scroll through the
inputs and outputs until you get to the output in question.
5. Alternately, turn on and off the output noting the voltage on the voltmeter.
It should vary between 0 volts for ON and 5 volts for OFF.
CPU 8.4.10.
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 instrument 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.
RS-232 COMMUNICATIONS 8.4.11.
General RS-232 Troubleshooting 8.4.11.1.
Teledyne API calibrators 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 four general areas:
Incorrect cabling and connectors. See Section 5.1.2 for connector and pin-
out information.
The BAUD rate and protocol are incorrectly configured. See Section 5.1.3.
If a modem is being used, additional configuration and wiring rules must be
observed. See Section 5.2
Incorrect setting of the DTE – DCE Switch is set correctly. See Section
5.1.1.
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