User manual

(4.0E) 2-5
2
3
4
Level control
The detented level control adjusts the E-PAC input sensitivity and
has a 18 dB range, -12 dB to +6 dB, calibrated in 0.5 dB steps.
The level control is normally set to 0 dB.
ISP LED- Input Signal Present (green)
− Illuminates when the E-PAC input signal exceeds -36 dBu.
The ISP indication is unaffected by the setting of the level
control and the MUTE function but will not operate in
STANDBY mode.
ERR LED - Error (red)
The ERR LED is a combined display for gain reduction, overload
and error status of the E-PAC.
− Illuminates depending on the input signal (whilst the
green ISP LED (3) also illuminates): Gain Reduction. The E-
PAC limiter circuit reduces gain by more than 3 dB. This state is
not critical at all but shows the system has reached its limits.
− Illuminates depending on the input signal (whilst the
green ISP LED (3) goes off): Overload. Either the input signal
level is too high or the E-PAC is trying to deliver too high an
output current. If in doubt of the reason reduce the input gain
at the E-PAC level control. If the error display disappears the
output curent has been too high (load impedance too low from
too many speakers connected or a defective cable or
connector). If this does not affect the situation, the input signal
to the E-PAC is too high (more than +18 dBu).
− Flashes periodically: Temperature overload. E-PAC is
now electronically muted with the speaker output disconnected.
When the E-PAC has cooled to normal working temperature it
will automatically resume operation.
− Illuminates continuously whilst the Mute/Standby switch
LED (1) flashes. An external fault has been detected such as
a loudspeaker cable short or some other low impedance load
condition. In this state the E-PAC is electronically muted and the
speaker output disconnected. Once the cause of the fault has
been identified and removed, the device has to be set to
standby mode to leave the error status. A further brief press of
the Mute/Standby switch will reset the E-PAC ready to resume
normal operation.
− Illuminates continuously along with the Mute/Standby
switch LED (1). An internal fault has been detected and the
E-PAC electronically muted with the speaker output
disconnected. As the E-PAC has no internal user serviceable
parts, the unit will need the attention of an authorised d&b
service partner.