Teledyne 6200T - Sulfides Analyzer - Manual (Page 253)

6200T Total Sulfur Analyzer Troubleshooting
Teledyen Analytical Instruments 253
12.6.4. Touch-screen Interface
Verify the functioning of the touch screen by observing the display when pressing a
touch-screen control button. Assuming that there are no wiring problems and that the
DC power supplies are operating properly, but pressing a control button on the touch
screen does not change the display, any of the following may be the problem:
 The touch-screen controller may be malfunctioning.
 The internal USB bus may be malfunctioning.
You can verify this failure by logging on to the instrument using AICOM or a terminal
program. If the analyzer responds to remote commands and the display changes
accordingly, the touch-screen interface may be faulty.
12.6.5. LCD Display Module
Verify the functioning of the front panel display by observing it when power is applied
to the instrument. Assuming that there are no wiring problems and that the DC power
supplies are operating properly, the display screen should light and show the splash
screen and other indications of its state as the CPU goes through its initialization
process.
12.6.6. Relay Board
The relay board circuit can most easily be checked by observing the condition of its
status LEDs as described in Section 12.2, and the associated output when toggled on and
off through the SIGNAL I/O function in the DIAG menu, refer to Section 5.9.1.
 If the front panel display responds to button presses and D1 on the relay
board is not flashing, then either the I 2 C connection between the
motherboard and the relay board is bad, or the relay board itself is bad.
 If D1 on the relay board is flashing, but toggling an output in the Signal I/O
function menu does not toggle the output’s status LED, the there is a circuit
problem, or possibly a blown driver chip, on the relay board.
 If D1 on the Relay board is flashing and the status indicator for the output
in question (heater, valve, etc.) toggles properly using the Signal I/O
function, but the output device does not turn on/off, then the associated
device (valve or heater) or its control device (valve driver, heater relay) is
malfunctioning.
Several of the control devices are in sockets and can easily be replaced. The table below
lists the control device associated with a particular function:
Table 12-6: Relay Board Control Devices
FUNCTION CONTROL DEVICE SOCKETED
Valve0 – Valve3 U5 Yes
Valve4 – Valve7 U6 Yes
All heaters K1-K5 Yes