Electro-Voice CPS 3, Руководство по обслуживанию

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3
MEASURED SPECIFICATIONS: CPS4 entire unit
Measurement conditions, unless differently specified:
• tolerance of measured values:
∆
X = ±1.5 dB
• measuring frequency: f = 1 kHz
• stated levels refer to: U = 775 mV (0 dBu)
• level controls set to their clockwise limits
• pin assignment of the XLR-type connectors: PIN 1: GROUND
PIN 2: + INPUT
PIN 3: - INPUT
• source resistance for the induction via the XLR-type connector: R(Q) = 50
Ω
• MAIN-PCB numbers relate to the models as follows:
MAIN - PCB
CPS4 / 120 V 86211
CPS4 / 230V 86207
• MAIN-PCB and POWER-AMP-PCB are provided with service connectors.
The Pin-assignment of these service connectors is as follows:
84157 86207
86211 86207
86211
CNSERV Assignment CNASERV Assignment CNBSERV Assignment
1 Kodierung 1
Limiter A
&
B OFF
1 n.c.
2 BIAS Hot - Side + 2 Service Limiter A 2 Service Limiter B
3 BIAS Hot - Side - 3 -15V 3 - 15 V
4 Hot - Out 4 GND 4 Fan voltage
5 BIAS Cold - Side + 5 + 15 V 5 Service Fan
Switch
6 BIAS Cold - Side - 6 heat sink temperature
A
&
B
6 Service Fan
Switch
7 GND 7 + U1 front-end A 7 + U1
front-end B
8 floating v 8 - U1 front-end A 8 - U1
front-end B
9 floating voltage - 9 coding 9 coding
1. Operating voltage: U(B) = 120V/ 230V/ 240V
depending on the model: 50Hz ... 60Hz
2. Deviation limit of the operation voltage: ±10%
3. Power consumption (both channels driven):
3.1. at idling condition P(B) = 180 - 260 W
3.2. at standard operation (120W/4
Ω
) P(B) = 1500 W
3.3. at nominal condition (1200W/4
Ω
) P(B) = 4100 W
3.4. at 1/8 of the nominal power (150W/4
Ω
) P(B) = 1650 W
4. Settings / Adjustments
4.1. IDLING CURRENT ADJUSTMENT
Connect the DC-volt meter at the BIAS measuring points (refer to table) and adjust the idling current via the trim
potentiometer (on the printed board assembly 84157). Adjust both channels of the power amplifier A&B.
Setting Measuring point 1 Measuring point 2 U (DC) BIAS trimmer
BIAS HOT A CNSERV 2 CNSERV 3 15 mV VR1
BIAS COLD A CNSERV 5 CNSERV 6 15 mV VR2
BIAS HOT B CNSERV 2 CNSERV 3 15 mV VR1
BIAS COLD B CNSERV 5 CNSERV 6 15 mV VR2
Adjusting the idling current has to be performed at normal room temperature. In case the power amplifier had
previously been operated, it has to be given several hours to cool off.