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UNDERSTANDING THE INDICATORS ON THE A 51
a AC Present Indication
When the A 51 is plugged into a live AC outlet, a soft blue halo glows behind its On-Off
button and its red “P” Badge glows faintly. These indicate that the unit is plugged into a live
AC outlet, even when it is turned off.
b
On, Off and Fault/Protection Status Indicators
Whenever the A 51 is turned on, the soft blue glow behind its On-Off button will change
to red for about five seconds as its internal circuits stabilize. Then the red glow is replaced
by a brighter blue glow to indicate normal operation. If the glow remains red after turn on
or while the amp is playing, it indicates activation of the A 51’s protection circuits and no
sound will be heard from the speaker.
The A 51 protects itself from external conditions such as excessive heat, load impedance
that is too low, or a short-circuited speaker connection or wire. After you correct the fault,
the A 51 will resume operation. If the A 51 remains “in protection” after it has cooled down
and you’ve confirmed there are no external faults, it could indicate an internal problem.
Please contact Parasound’s Technical Service Department.
c
– g Channel Status Indicators
These are the five small round indicators in the center of the recess in the front panel.
The indicator on the left displays the status of channel one and the subsequent indicators
display the status of channels two through five.
c
– g All Indicators Illuminated
When all five channels are operating normally, these will all glow blue.
c
– g No Illumination:
When the A 51 is turned off, these indicators are off. An indicator that does not glow when
the A 51 is turned on represents a fault in that channel.
h
High-Temp Indicator
This indicator is near the right side of the panel recess. It will glow red if any channel over-
heats. The On-Off button will also glow red if the A 51 overheats. Refer to the
Troubleshooting Guide on page 11.
8
L U C A S F I LMLM
On-Off Hi Temp
Amplifier A 51