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Operation Manual
MA-5002VZ  Power Amplifier
page 12
4.2  Front Panel Controls  
and Indicators
A. Dust Filter
Removes large particles from the air at the 
air intake. The filter elements can be easily 
removed for cleaning by gently pulling 
them away from the front panel. Filters can 
be cleaned by soaking in a mild detergent 
and water.
 B. Level Control
Rotary detented level control, one per 
channel.
C. ILoad/ILimit Indicator
Dual-color LED, one per channel. Indicator 
is off when there is no significant load cur-
rent (extremely low or no input signal, or 
no load connected to the channel's out-
put); illuminates green to indicate that load 
current is flowing; and illuminates red if 
the amplifier has reached its maximum 
output current capacity. See Section 5.2.3 
for more  about ILoad/ILimit.
D. Signal/IOC Indicator
Green LED, one per channel. Dual-pur-
pose indicator illuminates to indicate the 
presence of input signals;  flashes brightly 
with a 0.1-second hold delay to indicate a 
difference (distortion) between the input 
and output signal of 0.05% or greater; and 
flashes brightly with a 0.5-second hold 
delay to indicate input clipping distortion. 
See Section 5.1.2 for more about IOC. 
E. ODEP Indicator
Amber LED, one per channel, illuminates 
brightly to indicate presence of thermody-
namic energy. They dim proportionally as 
energy reserves decrease. In the event that 
energy reserves are depleted, the indica-
tors turn off and ODEP limiting occurs. 
See Section 5.1.1 for more about ODEP.
F. Enable Indicator
Green LED indicates amplifier has been 
turned on and AC power is available.
G. Enable Switch
Amplifier is on when the switch is in the IN 
position.
H. VZ Mode Switch
Four-position switch, one Per Channel. 
Allows selection of “VZ-ODEP,” “Lock 
Low,” and “VZ” power supply modes, from 
left to right (right-most two positions both 
select VZ mode). See Section 5.2.2 for 
more about VZ and the VZ Mode Switch.
Figure 4.1 Front Panel 
Controls and Indicators 
(shown with top filter grille 
removed for clarity)
4 Operation 
(continued)