Teledyne 6200T - Sulfides Analyzer - Manual (Page 255)

6200T Total Sulfur Analyzer Troubleshooting
Teledyen Analytical Instruments 255
1. Connect a cable jumper between the “-“ pin and the “” pin on the status output
connector.
2. Connect a 1000 Ω resistor between the +5 V and the pin for the status output that is
being tested.
Table 12-8: Status Outputs Check Pin Out
PIN
(left to right)
STATUS
1 System Ok
2 Conc Valid
3 High Range
4 Zero Cal
5 Span Cal
6 Diag Mode
7 Spare
8 Spare
8.
3. Connect a voltmeter between the “-“ pin and the pin of the output being tested (refer
to Table 12-8).
4. Under the DIAG  SIGNAL I/O menu (refer to Section 5.9.1), scroll through the
inputs and outputs until you get to the output in question. 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.
12.6.7.4. Control Inputs
The control input bits can be tested by the following procedure:
1. Connect a jumper from the +5 V pin on the STATUS connector to the U on the
CONTROL IN connector.
2. Connect a second jumper from the pin on the STATUS connector to the A pin on
the CONTROL IN connector. The instrument should switch from SAMPLE mode to
ZERO CAL R
mode.
3. Connect a second jumper from the pin on the STATUS connector to the B pin on
the CONTROL IN connector. The instrument should switch from SAMPLE mode to
SPAN CAL R
mode.
In each case, the 6200T should return to SAMPLE mode when the jumper is removed.
12.6.8. 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.