Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 224)

Troubleshooting & Repair Model 9110EH Instruction Manual
11.5.4. AC Power Configuration
The M9110EH can be easily configured for two main power regimes, 100-120 V and 220-240 V
at either 50 or 60 Hz. The analyzer is correctly configured for the AC power voltage in use if
the voltage selector plug is configured properly. See Figure 3-1 and Figure 11-4 for the
location of this plug. The plug for 100-120 V should have white jumper wires, the plug for
220-240 V should have blue jumper wires. Note, that an analyzer configured for 230 V will
still turn on at 115 V (and vice versa), but the heaters may burn out or not heat up fast
enough. Internally, several LEDs should turn on as soon as the power is supplied. If an
incorrect power configuration is suspected, check for the correct voltage and frequency at
the line input on the rear panel.
Note that the analyzer will be severely damaged if 220-240 V is supplied to it when
configured for 100-120 V. Never bypass the power switch or circuit breaker.
11.5.5. DC Power Supply
If you have determined that the analyzer’s AC main power is working, but the unit is still
not operating properly, there may be a problem with one of the instrument’s switching
power supplies, which convert AC power to 5 and ±15 V (PS1) as well as +12 V DC power
(PS2). The supplies can either have no DC output at all or a noisy output (fluctuating).
To assist tracing DC Power Supply problems, the wiring used to connect the various printed
circuit assemblies and DC powered components and the associated test points on the relay
board follow a standard color-coding scheme as defined in Table 11-3.
Table 11-3: DC Power Test Point and Wiring Color Code
Name Test Point# Color Definition
DGND 1 Black Digital ground
+5V 2 Red
AGND 3 Green Analog ground
+15V 4 Blue
-15V 5 Yellow
+12R 6 Purple 12 V return (ground) line
+12V 7 Orange
A voltmeter should be used to verify that the DC voltages are correct as listed in
Table 11-5. An oscilloscope, in AC mode and with band limiting turned on, can be used to
evaluate if the supplies are excessively noisy (>100 mV peak-to-peak).
210 M9110EH Rev 0