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Teledyne ML - T101 Operation Manual
Troubleshooting & Service
227
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.
If the unit is set for 220-240 V and is plugged into 100-120 V, the analyzer will not start.
If the unit is set for 100-120 V and is plugged into 220-240 V, 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. 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.
9.5.4.
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 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 11-4.
Table 9-4. 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
+12V
6
Purple
+12R
7
Orange
12 V return (ground) line
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).
Table 9-5. 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
+4.80
+5.25
PS1
+15
AGND
3
+15
4
+13.5
+16.0
PS1
-15
AGND
3
-15V
5
-14.0
-16.0
PS1
AGND
AGND
3
DGND
1
-0.05
+0.05
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