2 Instrument Configuration
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57
Problem
Description
Problem Indicators
Solution
Analogy power
input of -5V is not
loaded
The power indicator light D23 is not lit
up or looks dim, and the power chip U3
feels very hot.
This issue is mostly caused by the
fact that the analog power input of
-5V has shorted out. Another
possible reason is the breakdown
of the polar capacitors (mostly
tantalum capacitors here). Due to
the abundance of -5V networks,
users are recommended to
replace the motherboard. The
damaged components can be
located by PCB for replacement
by qualified maintenance
personnel.
Analogy power
input of +5V is not
loaded
The power indicator light D25 is not lit
up or looks dim, and the power chip U2
feels very hot.
This issue is mostly caused by the
fact that the analog power input of
+5V has shorted out. Another
possible reason is the breakdown
of the polar capacitors (mostly
tantalum capacitors here). Due to
the abundance of +5V networks,
users are recommended to
replace the motherboard. The
damaged components can be
located by PCB for replacement
by qualified maintenance
personnel.
The ARM system
on the main control
panel is not running
The powered-on device fails to do
self-test; the ARM status indicator light
D79 is not flashing and the indicator
light for ARM power management chip
D14 is lit up.
The power management chip U11
may be damaged; it is
recommended that a qualified
maintenance person replace U11
The ARM system
on the main control
panel is not running
The powered-on device fails to do
self-test; the ARM status indicator light
D79 is not flashing and the indicator
light for ARM power management chip
D14 is on.
Some circuit in the power
management chip U11 may have
shorted out. Qualified
maintenance personnel can use a
multimeter to test the power
output testing points throughout
U11 to locate the problematic
circuit. Start from the capacitor
and move along until locating the
short circuit.
