Teledyne GFC-7001T - Trace CO Analyzer - Manual (Page 272)

Troubleshooting and ServiceTeledyne API – Model T300/T300M CO Analyzer
Teledyne Analytical Instruments 272
A voltmeter should be used to verify that the DC voltages are correct per the values in
the table below, and an oscilloscope, in AC mode, with band limiting turned on, can be
used to evaluate if the supplies are producing excessive noise (> 100 mV p-p).
Table 12-7: DC Power Supply Acceptable Levels
POWER
SUPPLY
ASSY
VOLTAGE
CHECK RELAY BOARD TEST POINTS
MIN V MAX V FROM TEST POINT TO TEST POINT
NAME # NAME #
PS1 +5 Dgnd 1 +5 2 4.8 5.25
PS1 +15 Agnd 3 +15 4 13.5 16V
PS1 -15 Agnd 3 -15V 5 -14V -16V
PS1 Agnd Agnd 3 Dgnd 1 -0.05 0.05
PS1 Chassis Dgnd 1 Chassis N/A -0.05 0.05
PS2 +12
+12V Ret 6 +12V 7 11.75 12.5
PS2 Dgnd +12V Ret 6 Dgnd 1 -0.05 0.05
12.5.3. I 2 C BUS
Operation of the I 2 C bus can be verified by observing the behavior of D1 on the relay
PCA. Assuming that the DC power supplies are operating properly, the I 2 C bus is
operating properly if D1 on the relay PCA is flashing.
12.5.4. TOUCHSCREEN INTERFACE
Verify the functioning of the touchscreen by observing the display when pressing a
touchscreen control button. Assuming that there are no wiring problems and that the DC
power supplies are operating properly, if pressing a control button on the display does
not change the display, any of the following may be the problem:
 The touchscreen controller may be malfunctioning.
 The internal USB bus may be malfunctioning.
You can verify this failure by logging on to the instrument using APICOM or a terminal
program to any of the communications ports. If the analyzer responds to remote
commands and the display changes accordingly, the touchscreen interface may be faulty.
12.5.5. 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 with logo and other indications of its state as the CPU goes through its
initialization process.
12.5.6. RELAY BOARD
The relay board PCA (P/N 04135) can be most easily checked by observing the
condition of the its status LEDs on the relay board, as described in Section 12.1.4.3, and