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Telonics TCA-500C Combo Amp
38
PB-009289 Rev E
TCA-500C
T
HERMAL
M
ANAGEMENT
S
YSTEM
(
CONTINUED
)
F
AN
-W
EAR
B
ALANCING
In order to further minimize the noise produced by the fans, and to prolong the life of the fans,
the fans are controlled individually. Whenever the temperature of the amplifier is below the Low
temperature threshold, one of the fans is turned off, and one fan continues to run at the minimum
speed. In most environments, when the amplifier is idle or played at lower levels, a single fan is
adequate to maintain a desirable temperature within the amplifier. Whenever the amplifier
temperature rises above the Low threshold, the second fan is turned on in addition to the first
one; therefore, both fans will be running, initially at the minimum speed. Should the temperature
of the amplifier continue to rise, the speed of both fans will be increased accordingly; if the
temperature of the amplifier drops, the speed of both fans is reduced accordingly. If the
temperature of the amplifier again drops below the Low threshold, then the second fan is turned
back off. The fan which will ‘always be On’ is alternated every time that the AC mains power is
cycled. Thus, in the long run, the wear on the fans will be balanced.
S
TUDIO
(N
O
F
ANS
)
M
ODE
:
T
EMPERATURE
I
NDICATION
To enable the studio mode, turn the Power Amp On/Off switch to the “Off” position. The Power
Amp switch is located on the rear panel, just above the AC (Mains) power cord socket.
In the Studio mode, the power amplifier is switched off and the fans are not turned on. In this
mode, the LEDs blink a special pattern to alert the user to the fact that the unit is in this mode,
the power amplifier is off, and to indicate the temperature of the amplifier. The blink pattern is
three (3) short blinks (winks) followed by a short pause, and then repeat. For added visual
emphasis, in later model amplifiers, this pattern is supplemented by all three LEDs blinking three
(3) times; alternating with the temperature display indication.
The amplifier’s temperature is indicated on the front panel via the status LEDs:
Green winking
Temperature is below the Medium temperature
threshold
Green and Yellow winking
Temperature is above the Medium temperature
threshold
Green, Yellow, and Red winking
Temperature is above the High temperature
threshold
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