Testing Capacitor Board (B3F3Xr00) - Classe Audio Delta Series Service Manual

Before regulator Q301 (left side of diode D301) about 20Vdc
After regulator Q301 (right side of diode D301) 12Vdc.
Before regulator Q302 (right side of diode D302) about -20Vdc
After regulator Q302 (left side of diode D302) -12Vdc.
Before regulator Q401 (pin 1) 12Vdc
After regulator Q401 (pin 3) 5Vdc.

Testing Capacitor Board (B3F3XR00)

For the following tests use a "bypassed" power-supply jig powered from a variac.
Connect the secondary of transformer to AC2 and AC4 and Center Tap at AC6.
Bring up the AC gradually (in 15V steps) while measuring the main DC rails at +V201 and –V201 relative to ground
at GND201. Keep a close eye on the circuits, listen for frying or popping noises, and feel the variac for vibration
caused by excess current. If you hear a capacitor pop, mark the board and replace it. Raise the variac voltage until
you measure +/-66Vdc on the DC voltage rails (about 70Vac on the variac, depending on the transformer on the
jig).
Now do the same thing to other side of the board.
Connect the secondary of transformer to AC1 and AC3 and Center Tap at AC5.
Bring up the AC gradually (in 15V steps) while measuring the main DC rails at +V101 and –V101 relative to ground
at GND101. Keep a close eye on the circuits, listen for frying or popping noises, and feel the variac for vibration
caused by excess current. If you hear a capacitor pop, mark the board and replace it. Raise the variac voltage until
you measure +/-66Vdc on the DC voltage rails (about 70Vac on the variac, depending on the transformer on the
jig).
Disconnect the capacitor board and discharge the capacitors.
CA(P)2100 AMP Service Manual v1.4 inc voltage change info .doc Page 11 of 50