Yamaha CP2000 Panduan Servis - Halaman 17

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Halaman Cetak

INSPECTIONS

Inspection during stereo mode and parallel mode

1.1

Preparations

Input attenuator

Input terminal

Mode SW

Yamaha speaker processing

Output terminal

Others

1.2

Inspection and adjustment

1.2.1 Fan and temperature indicator

The fan shall operate when the two jumper wires inside the frame marked

FAN-C inside sheet IN are shorted. Next, the temperature indicator shall

come on when the two jumper wires inside the frame marked TM-C are

shorted. (Refer to the figure to the right for FAN-C, TM-C.)

1.2.2 Power on muting time

At t=2.5

1 seconds after the power switch is turned on, the muting shall be cancelled and the protection indicator shall go off.

1.2.3 Idling current

Ground the input terminal and adjust VR101 (L ch) and VR102 (R ch) so that the CN108 (L ch) and CN107 (R ch) No. 1 and 2

terminals show DC voltage of Vb=0.5

Once all inspections have been completed, re-inspect Vb and adjust so that it is Vb=0.5

1.2.4 Output terminal DC voltage

Ground the input terminal and measure the Vdc (direct current voltage) of the output terminal. It shall be Vdc=0

1.2.5 Gain

An output voltage of +24.0

This inspection shall also be performed in the PARALLEL mode.

1.2.6 Frequency characteristics

* YAMAHA SPEAKER PROCESSING OFF:

Using 1 kHz as a standard for the output voltage, the output voltage shall be within -0.5

20 kHz, -10 B dBu sine waves are input to the input terminal.

* YAMAHA SPEAKER PROCESSING ON:

Using 1 kHz as a standard for the output voltage, with the Yamaha speaker processing off, the output voltage shall be within +

6.5

1.5 dB when a 70 Hz, -10 dBu sine wave is input to the input terminal.

1.2.7 Total harmonic distortion ratio characteristics

The total harmonic distortion ration shall be THD=1 % or less when a 1 kHz high definition sine wave is input to the input terminal

and the rated output of 650 w + 650 w / 4 ohm (36.4 dBu/ch) has been attained. This inspection shall be completed within 30 seconds.

1.2.8 Channel separation load resistance 8

When the input terminal for one of the channels has attained a 1kHz, -5dBu sine wave has and that input terminal is grounded by

the introduction of 600

with (0 dB) as the reference level.

1.2.9 Output noise level

Measure the noise level at the output terminal when the input attenuator has been set to MAX and a input terminal has been grounded

by the introduction of a 600

-70 dBu or less.

MAX

Cannon connector No. 2 hot; No. 1, 3 ground

Stereo

Off

Resistance load 4 , Non inductance resistor, input capacitance 500 W or more.

Unless otherwise specified, drive both channels unless otherwise specified.

0.1 mV.

0.5 dBu shall be attained when 1 kHz, -10.0 dBu sine wave is input to the input terminal.

resistance, the measured output voltage of the other channel shall by -70 dB or less, using a output voltage

resistance. It shall be -67 dBu or less. Next, set the input attenuator to MIN and measure. It shall be

3/6

2/6

0.1 mV.

0.5 dB at 20 kHz when 20 Hz, 1 kHz,

CP2000

TM-C

FAN-C

75 mV.