GAI-Tronics PA250-001 Podręcznik - Strona 11

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GAI-Tronics PA250-001 Podręcznik
Model PA250-001 250 Watt Central Amplifier
Problem:
Possible Cause:
Low audio output
VOLUME setting
Signal in level
Input or output
impedance not
matched
Possible low
resistance or shorted
wiring across the
audio in and/or across
the speaker OUT
Excessive audio
Above normal audio
output distortion
input drive level
plus output PEAK
LED is ON
Excessive static/
Input and/or output
electromagnetic
signal cables may be
interference
routed too close to
high voltage/high
electromagnetic
sources

Specifications

Electrical:
Input voltage:....................................................................... 114–126 V ac, 60 Hz only, 120 V ac nominal
Input power consumed (@ nominal V in) (Idle/Full out w/1K tone): ...... 10.9 W, 19.2 VA/514 W, 648 VA
Output power: (with adequate ventilation).................................................250 W
..................with 1 kHz sine in @ 100% duty cycle, derate to ~63 W
Audio output connections: .......................................................... Direct 8-ohm, Line out 25 V and 70.7 V
Frequency response: (@ rated output)
8-ohm output:................................................................ ~20 Hz - 20 kHz (+0/-3 dB) ref. to 1 kHz
25 V or 70 V line output:............................................... ~35 Hz - 12 kHz (+0/-1 dB) ref. to 1 kHz
Total harmonic distortion @ rated output, 1 kHz in, nominal V in:............................................... =/<0.3%
Hum/noise below rated output power: ..................................................... –75 dB minimum (un-weighted)
Input sensitivity for rated output: (with front and rear controls CW):
600-ohm (BAL) input:............................................................................... 500 mV
Hi-Z input: ................................................................................................ 500 mV
Tel-Page (BAL) input:.................................................................................. 50 mV
f:\standard ioms - current release\42004 instr. manuals\42004-340e.doc
06/02
Possible Solution:
•
Check VOLUME control setting on front panel.
•
Check 600 ohm/Tel-Page gain level setting (rear), if
applicable.
Check that adequate input signal level is strong enough.
Check that the proper input/output line impedance
matches the selected input/output connections used.
Check/correct system wiring.
Reduce input drive signal accordingly.
•
Reroute cables away from high voltage/high
electromagnetic sources.
•
Use shielded cables
@ Ta = +50 °C @ nominal V ac in
RMS
~25 Hz - 20 kHz (+0/-3 dB) ref. to 1 kHz
Pub. 42004-340E
Page: 11 of 12
Cont. @ Ta = +24° C
RMS
(maximum)
RMS
(maximum)
RMS
(minimum)
RMS