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Remove, align and carefully reinstall
the fi rmware chip. Test system, if still
not operable, replace Power Center
PCB and fi rmware chip.
If fuse blows
again: PCB is
damaged. If
fuse doesn't
blow, driver
chips are bad.
Replace appro-
priate compo-
nent.
Check voltage
on red terminal
bar between the
outside two ter-
minals (red and
green wires).
Is voltage 8 to
10VDC?
No LEDs
are on at the
All Button
Control-
ler or the
OneTouch
display is
blank.
At Power
Center,
move over-
ride switch
from Auto
to Ser-
vice. Do
override
switches
operate?
No
Yes
7.2 Controller Inoperable, Display Blank
Yes
No
Go to the Control-
ler and measure
the voltage be-
tween the same
two terminals. Is
the voltage 8 to 10
VDC?
The power supply is damaged and
the PCB at the Power Center will
need to be replaced.
Yes
No
Controller PCB
will need to be
replaced.
Wires are broken
or in the wrong
place.
Check voltage
across second-
ary of trans-
former (two
yellow wires
of orange 3-pin
connector).
Is voltage 24
VAC?
Yes
No
Yes
No
Turn off power
and remove
3.15 amp fuse.
Check for con-
tinuity. Is there
continuity?
Yes
No
Unplug all
JVAs and re-
place fuse, and
turn on power.
Does fuse fail
again?
Remove
both relay
driver chips
and replace
the fuse.
Check voltage to primary of
transformer. Is primary 110
VAC?
Yes
No
Replace transformer.
Check circuit
breaker and system
power wires.
Check JVAs for
spliced wires, water
damage or incorrect
voltage. Plug JVAs
in one at a time, if
fuse blows again
replace that JVA.
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