Lexicon
5-27
To access the menu, the EDIT button must be pressed and the 7-segment display will now read 0 and no
headroom LEDs will be lit.
This selection (0) is the Display Read Scope Loop. When the STORE button is pressed, the scope loop
starts running infinitely.
There are 3 selections 0, 1 and 2. The ENCODER is used to make the selections.
When 1 (Display Write Scope Loop) is selected the right 7-segment display will read 1 and both -24
Headroom LEDs will be lit.
When the STORE button is pressed, the scope loop starts running infinitely.
When 2 (Initialize Operating System) is selected the right 7-segment display will read 2 and both -18
Headroom LEDs will be lit. When the STORE button is pressed, the Operating System reinitializes and
enters normal operating mode.
The following information aids the testing of a non-functioning unit (no display, pegged level and clip LEDs,
load noises, popping, crashes, and or no output). The following test procedures are provided for checking
power supplies, system clocks, and battery voltages.
W
W
A
A
R
R
N
N
I
I
N
N
G
G
C
C
A
A
U
U
T
T
I
I
O
O
N
N
As the following procedures require removal of the MPX G2
cover, it is imperative that these tests be performed with regard
to all safety and ESD precautions.
Removing the Top Cover:
Remove the eight-(8) screws, which attach the MPX-G2 top cover to the chassis.
WARNING
THE POWER SUPPLY IN THIS UNIT HAS A LIVE HEAT SINK.
DO NOT TOUCH WHILE THE UNIT IS PLUGGED IN AND POWERED ON.
Power Supply:
1. Plug in the MPX-G2 and set the Variac for nominal line voltage.
2. Set the DMM to measure VDC and check the following regulated voltages for proper levels using the
chassis as ground.
Supplies Location Range
+15VA Test point marked +15VA +14.25 to + 15.75
just above C153 left of P/S
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