Ac Power Check - Classe Audio Delta Series Service Manual

Verify the version of software loaded into the front-panel board and the control/sensor modules (see Appendix
F for latest software versions). If these are not up-to-date, you should load the latest software versions using
the MPLAB ICD 2 "hockey-puck" programmer.
Set the model number of the amplifier according to which front panel you are testing (see Appendix B).

AC power check:

Type in "sdp" (followed by the Enter key). You will get a response detailing the AC power parameters. For
example:
AC Setting = 120
Line V = 122 V
Current = 0.0 A
Line Freq. = 61 Hz
Internal Temp. = 25 C
Ground is OK.
Line Phase is OK.
OK
Verify that all the readings are correct (especially the AC line voltage and the temperature).
If your AC voltage from your variac does not agree with the setting of the Voltage Selector jumper (CON 1)
on the AUX power supply, the "bad power" LED (D404) on the AUX PS will go on. The AUX PS transformer
will NOT power up (so the front panel and RS-232 will NOT work) until this condition is cleared. You should
test this function by unplugging the system and switching the voltage select jumper (ONLY) to 240V. The "bad
power" LED will be on and the Standby LED on the Front Panel will be off (no power to the AUX PS). Switch
the voltage selector jumper back to 120V when you're done.
The acceptable voltage ranges are:
240VAC setting: accept over 185Vac an under 260Vac
230VAC setting: accept over 185Vac an under 260Vac
120VAC setting: accept over 95Vac and under 135Vac
100VAC setting: accept over 90Vac and under 110Vac
If the voltage is out of the specified range, the unit will NOT turn on.
If the voltage goes out of range while the unit is ON then:
If the voltage is OVER for more than 10 seconds the unit will shutdown, an AC fault will be recorded
in the fault log, and the Standby LED will flash fast (2 blue flashes per second).
If the voltage is UNDER the unit will remain on (keep playing) but the Standby LED will flash fast (2
blue flashes per second).
Unplug the AC and remove the Earth pin. Reconnect the AC (without the Earth pin) and repeat the "sdp"
command. You should see an error message indicating this fault.
Unplug the AC, reconnect the Earth terminal, but reverse the line and neutral terminals. Again, when you do
an "sdp" you should see an error message indicating this fault.
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