Classe Audio CP-65, Руководство по обслуживанию

Страница: 29 / 36

Classé CP-65 Software Upgrade
This document details the steps to upgrade your CP-65 Preamplifier from
software revision 65-102A47 to CS103B02.
This new release solves the random problem of the unit becoming unstable when
using the unity gain option.
Warning !
Before starting this procedure make sure the unit is shut off and unplugged from
the main A.C. line.
Section 1.0 Removing Main Unit Cover
To remove the cover of the CP-65 main unit simply remove the 8 medium sized
Philips screws and lift off the top cover.
Section 2.0 Replacing the Firmware IC
We have supplied 2 schematic diagrams, Figures 1 and 2, to help you locate the
integrated circuit (IC) that needs to be replaced. Figure 1 shows you the
complete layout of the main unit and a highlighted area in which the firmware
IC (U503) is located.
U503 is located in the center of figure 2 and above C340 and C317 when looking
at the unit with the front panel facing you. The IC is a dual inline package with 28
pins and is placed on the main board with the notch towards the rear panel.
Remove U503 with the supplied chip puller and replace it with the new IC
labeled CS103B02. Make sure you place the new IC with its’ notch facing the
rear of the unit.
Incorrect placement will of U503 will cause your CP-65 not to turn on.
Once you have replaced the IC you should power up the unit to ensure proper
placement and seating. When you have verified proper power up of the unit
you can then shut down the unit and replace the top cover. We have supplied
you with 8 new top cover screws to replace any damaged or marked during this
procedure.