In Case of Trouble
CHAPTER 4
IN CASE OF TROUBLE
No Sound | ¥Is the power switch on? If not, turn it on. |
| ¥Is the power light on? If not, confirm that the amplifier |
| is plugged into a live AC mains circuit of appropriate |
| voltage and current capacity. |
| ¥Check the circuit breaker and reset it if it is open. If the |
| breaker opens immediately, there may be a short |
| circuit across the output terminals; if not, there is a |
| possible internal fault in the amplifier which will |
| require service by a qualified technician. |
| ¥Is the amplifier input connected to a live signal source? |
| Is the loudspeaker solidly connected to the amplifier |
| output at both ends of the speaker cable? Is the |
| speaker faulty? |
| ¥Is the amplifier very hot? Is the ambient temperature |
| and/or the air flow in the rack abnormal? If so, the |
| amplifier may be in thermal protect mode; normal |
| operation will resume when its internal temperature |
| has dropped to reliable levels. |
Weak or Distorted Signal | ¥Is the signal source working correctly? |
| ¥Is the wiring to the amplifier input properly connected |
| at both ends? |
| ¥Have the gain controls of the signal source or the |
| amplifier been moved since the system was set up? |
16 | Matica 500/900 Reference Manual |