Teledyne T200, Operation Manual, Page: 252 / 425

Troubleshooting & Service Teledyne API
– T200 NO/NO2/NOx Analyzer Operation Manual
250
Table 12-7: DC Power Supply Acceptable Levels
POWER
SUPPLY
VOLTAGE CHECK RELAY BOARD TEST POINTS MIN V MAX V
FROM
Test Point
TO
Test Point
NAME # NAME #
PS1 +5 DGND 1 +5 2 +4.85 +5.25
PS1 +15 AGND 3 +15 4 +13.5 +16.0
PS1 -15 AGND 3 -15V 5 -13.5 -16.0
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 +11.8 +12.5
PS2 DGND +12V Ret 6 DGND 1 -0.05 +0.05
12.7.3. I
2
C BUS
Operation of the I
2
C bus can be verified by observing the behavior of D1 on the relay
PCA & D2 on the Valve Driver PCA. Assuming that the DC power supplies are
operating properly, the I
2
C bus is operating properly if D1 on the relay PCA and D2 of
the Valve Driver PCA are flashing
There is a problem with the I
2
C bus if both D1 on the relay PCA and D2 of the Valve
Driver PCA are ON/OFF constantly.
12.7.4. LCD/DISPLAY MODULE
TOUCHSCREEN INTERFACE
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.
12.7.5. RELAY PCA
The Relay PCA can be most easily checked by observing the condition of the status
LEDs on the Relay PCA (see Section 12.3.2), and using the
SIGNAL I/O submenu
under the DIAG menu (see Section 12.1.3) to toggle each LED ON or OFF.
If D1 on the Relay PCA is flashing and the status indicator for the output in question
(Heater power, Valve Drive, etc.) toggles properly using the Signal I/O function, then
the associated control device on the Relay PCA is bad.
Several of the control devices are in sockets and can be easily replaced. The following
table lists the control device associated with a particular function:
Table 12-8: Relay PCA Control Devices
FUNCTION CONTROL DEVICE SOCKETED
All valves U5 Yes
Reaction Cell Heater K1 Yes
NO
2
 NO Converter heater K2 Yes
Permeation Tube Heater for
Optional Internal Span Gas Generator
K4 Yes
06858E DCN7057