Classe Audio CAP-101 Wartungshandbuch PDF herunterladen (Seite 5)

PRO-SVR_LEGACY Page 5 of 14

Start Up Procedure

When receiving a unit, an assiduous visual inspection must be performed. Do not connect the unit without

analysing the symptoms reported by the customer and the results of the inspection.

Using the troubleshooting guide, find the problem and proceed to the repair. Once this step is done, follow

these steps, known as the start-up procedure, to ensure that everything in the unit is in working condition.

1. Proceed with a post repair visual inspection. Take the time to check if every wire is reconnected

properly, every screw is bolted on, no soldering and/or metal residues lying in the unit, every fuse has

been replaced, etc.

2. Turn the bias trimpots, counter clockwise until a click is heard.

3. Since there is no soft-start sequence of the CAP-80 / CAP-101, it is impossible to use a bypass to

perform a slow start up.

4. Connect Main supply, and turn on the unit.

5. If one or more supply are not within specifications, return to the troubleshooting guide.

6. If every supply is within specifications, report to calibration and adjusments to adjust bias and DC

offset. Note that bias can be adjusted to 14mV, and the following tests can be performed before the

unit is send to the burn-in bench for a 24 hours warm-up.

7. Connect the unit to a load, and to a source using single ended inputs.

8. Perform a test with a 200Hz, a 2kHz and a 20kHz tone, both sinus wave and square wave. Check the

output with a oscilloscope, on 4 ohms and 8 ohms loads. Take special cares about oscillation and phase

correlation between channels.

9. Connect the unit to a small speaker, and short the input. Check for any noise.

10. Put the unit on a burn-in bench, and let it sit for 24 hours, then readjust bias. Let the unit on the burn-

in bench for another 72 hours.

11. Redo steps 7 to 11 before shipping to the customer.

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Classe Audio CAP-101 Wartungshandbuch Seite 5