Dc Power Supply; Table 11-4: Dc Power Test Point And Wiring Color Codes; Table 11-5: Dc Power Supply Acceptable Levels - Teledyne 300E Instruction Manual

Model 300E Carbon Monoxide Analyzer
Instruction Manual
If the unit is set for 230 VAC and is plugged into 115VAC, or 100VAC the
§
sample pump will not start, and the heaters will not come up to temperature.
If the unit is set for 115 or 100 VAC and is plugged into a 230 VAC circuit,
§
the circuit breaker built into the ON/OFF Switch on the Front Panel will trip to
the OFF position immediately after power is switched on.

11.5.2. DC Power Supply

If you have determined that the analyzer's AC mains 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. The supplies can have two faults, namely no DC output,
and noisy output.
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 (03134) follow a standard color-coding scheme as
defined in Table 11-4.

Table 11-4: DC Power Test Point and Wiring Color Codes

A Voltmeter should be used to verify that the DC voltages are correct per the values
in Table 11-5 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).
Power
Supply
Assy
PS1
PS1
PS1
PS1
PS1
PS2
PS2
P/N 04288 REV: A
Name Test Point#
Dgnd
+5V
Agnd
+15V
-15V
+12V
+12R

Table 11-5: DC Power Supply Acceptable Levels

Check Relay Board Test Points
Voltage
From Test Point
Name
+5 Dgnd
+15 Agnd
-15 Agnd
Agnd Agnd
Chassis Dgnd
+12 +12V Ret
Dgnd +12V Ret
TROUBLESHOOTING & REPAIR PROCEDURES
TP and Wire Color
1 Black
2 Red
3 Green
4 Blue
5 Yellow
6 Purple
7 Orange
To Test Point
# Name
1 +5
3 +15
3 -15V
3 Dgnd
1 Chassis N/A
6 +12V
6 Dgnd
Min V Max V
#
2 4.8 5.25
4 13.5 16V
5 -14V -16V
1 -0.05 0.05
-0.05 0.05
7 11.75 12.5
1 -0.05 0.05
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