Relay Board; Table 11-5: Relay Board Control Devices - Teledyne 100E Instruction Manual

TROUBLESHOOTING & REPAIR
instrument and when a key is pressed on the front panel. Assuming that there are no
wiring problems and that the DC power supplies are operating properly:
• The vacuum fluorescent display is working properly if, on power-up, a "-"
character is visible on the upper left hand corner of the display.
• If the analyzer starts operation with a normal display but pressing a key on the
front panel does not change the display, then there are three possible problems:
o One or more of the keys is bad
o The interrupt signal between the keyboard circuit and the motherboard is
broken due to a cabling problem or
o The keyboard circuit is bad.
You can verify this failure by logging on to the instrument using APICOM or a terminal
program. If the analyzer responds to remote commands and the display changes
accordingly, the display wiring or the I

11.5.7. Relay Board

The relay board circuit can most easily be checked by observing the condition of its
status LEDs as described in Section 11.1.4, and the associated output when toggled on
and off through the SIGNAL I/O function in the DIAG menu, see Section 6.7.2.
If the front panel display responds to key presses and D1 on the relay board is not
flashing, then either the I2c 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:
212
2

Table 11-5: Relay Board Control Devices

Function
Valve0 – Valve3 U5
Valve4 – Valve7 U6
All heaters K1-K5
Model 100E Instruction Manual
C bus may be faulty.
Control Device
Yes
Yes
Yes
Socketed
045150102 Rev XB1