Protection
and Indicators Modes
The front LED shows the status of the amplifier. When starting up normally, the CAM350 will show a FLASHING RED LED for about 15 seconds and if all is normal, the LED will go SOLID RED. If there is a fault, the LED will go to a FLASHING GREEN LED. The CAM350 is equipped with four Mosfet protection fuses. In the event that one or more of these fuses would blow, first need to identify and cure the cause of failure. When the cause has been identified, disconnect the unit from the system including the AC power. Remove the top cover and look for damaged or burned components. If no other components than the fuses appear to be damaged, then replace the broken fuses with the same value and rating. The Mosfet fuses are located on the control board. When replacing fuses, make sure that the fuse holder are holding the fuses very tightly. A loose fuse holder can translate into distortion on top of the signal.
The front LED shows the status of the amplifier. When starting up normally, the CAM350 will show a FLASHING RED LED for about 15 seconds and if all is normal, the LED will go SOLID RED. If there is a fault, the LED will go to a FLASHING GREEN LED. The CAM350 is equipped with four Mosfet protection fuses. In the event that one or more of these fuses would blow, first need to identify and cure the cause of failure. When the cause has been identified, disconnect the unit from the system including the AC power. Remove the top cover and look for damaged or burned components. If no other components than the fuses appear to be damaged, then replace the broken fuses with the same value and rating. The Mosfet fuses are located on the control board. When replacing fuses, make sure that the fuse holder are holding the fuses very tightly. A loose fuse holder can translate into distortion on top of the signal.
Calibrations
and Adjustments
Bias adjustment:
Note: Bias adjustment should be made without any load connected to the amplifier’s output, and no signal connected to the amplifier’s input.
1. On positive rail, connect a multimeter to R111 leads and set the multimeter to mV scale.
2. Turn trimpot R104 counterclockwise until it reaches 0 Ohm. A click should be heard.
3. Turn on amplifier, and let it warm up for 15 minutes on idle.
4. Adjust trimpot R104 to get a 10mV reading.
5. Repeat procedure with negative rail.
6. Let the amplifier warm up for a 24 hours period with signal and load.
7. Remove signal and load, and reconnect the multimeter, setted to mV scale, to R112 leads.
8. Readjust R104 to get a 12mV reading.
Bias adjustment:
Note: Bias adjustment should be made without any load connected to the amplifier’s output, and no signal connected to the amplifier’s input.
1. On positive rail, connect a multimeter to R111 leads and set the multimeter to mV scale.
2. Turn trimpot R104 counterclockwise until it reaches 0 Ohm. A click should be heard.
3. Turn on amplifier, and let it warm up for 15 minutes on idle.
4. Adjust trimpot R104 to get a 10mV reading.
5. Repeat procedure with negative rail.
6. Let the amplifier warm up for a 24 hours period with signal and load.
7. Remove signal and load, and reconnect the multimeter, setted to mV scale, to R112 leads.
8. Readjust R104 to get a 12mV reading.
DC
offset:
Note: DC offset adjustment should be made without any load connected to the
amplifier’s output, and no signal connected to the amplifier’s
input.
On these units, DC offset can’t be adjusted. Measure DC offset using a voltmeter connected to the output posts, scale stetted to mV. DC offset should be less than 10mV.
On these units, DC offset can’t be adjusted. Measure DC offset using a voltmeter connected to the output posts, scale stetted to mV. DC offset should be less than 10mV.
