Troubleshooting – JBL MPA275 User Manual
Page 21
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20
Troubleshooting
Overheating:
A.
If ventilation is blocked, or if the amplifier is overdriven into low impedance
loads, it can overheat. The thermal protection system’s normal response to
rising temperatures is as follows:
25–50° C:
Fan runs on low speed.
50–60° C:
Fan Speed rises gradually from slow to full.
75° C:
PROTECT LED starts flashing.
85° C:
PROTECT flash rate increases, and CLIP starts to glow steadily. The
limiter will begin to reduce amplifier gain, up to 15 dB.
90° C:
Full muting occurs, as indicated by bright CLIP display and bright
PROTECT display (with rapid flashing superimposed). Full muting
should occur only if the load is shorted, ventilation is completely
blocked, or the fan fails.
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