Classe Audio CP-65, Service Manual

Page: 34 / 36

CP-65 Final Testing
1. Visual Inspection
- check the silkscreen of the chassis
- check scratches
-
check for all screws, washers, nuts, Pemnuts. Screws must be tight
-
check balance lock if working smoothly
- check input/output PCB’s. Left is for Left, right is for Right.
Left PCB- R6, R7 – 33 Right PCB- R1, R2- 33
2. Electrical Test
1) check the polarities of the dc cable
2) plug-in the unit. Test and measure voltages both main and
phono Dc supply of the power supply.
3) Refer to Cp-65 Mother PCB Part 2 Electrical Test Procedure
how to measure the supply voltage of the mother PCB.
4) Readjust the bias. Offset and 200 mv on the plug-in board.
Refer to Part 2 of CP-65 Plug In Board Procedure
3. Display Test and Functions
- refer to Cp-65 Panel and Display Procedure
4. Signal Test
1) Feed input signal 1 KHZ sinewave into input 1. Connect output
to the oscilloscope. Turn the volume up and down. Should see
both outputs. Check for noise and distortion
2) Check the unity gain of Line 1
3) Check the IR in and IR out
4) Check the 12v. trigger
5) Check balance left and right
6) Check mute on and off
7) Reset unit
8) Check back the Line 1 output. Should see output on output 1
and 2, output 1, output 2, both on balance and single ended
outputs but using the remote control
9) Check the phase
10) Repeat steps 1,2,8,9, for inputs 2,3, Tape 1, Tape 2, single
ended and balance inputs
11) Check bal. Outputs: the inverted signal should be the same
level with non-inverted signal, and should be 180 out of phase
with non inverted signal
12) Test output signals at 20 Hz, 100 Hz, 1KHz, 10 KHz, 20 KHZ
and 30 KHz square-wave. Look for noise and distortion