Crown Audio IQ-USM 810 Manual De Usuario

©2000 Crown International, Inc.

 Maintenance 4-7

 Ground conductor of the power inlet is connected

to chassis ground.

Note: This test to be completed after the complete product
assembly.

Procedure:
Verify power inlet less than 1 W between connector
ground and chassis.
Recommended chassis test points:
RS232 Connector shell or screw locks, Multi-Function
Control Port shell of screw locks or Crown bus connec-
tor shield.

 Power Supply withstands Hi-Pot spikes.

Verify unit allows no breakdown leakage

current with a 1-second, 1.2-kV Hi-Pot from AC mains
(Hot and Neutral) to earth ground.

 20 Hz to 20 KHz bandwidth, line mode:

–77 dBu
Frequency Response

 20 Hz to 20 KHz, referenced to

1 KHz, line mode: –0.27 dB.
Harmonic Distortion

 THD+N, at 1 KHz, 20 Hz to 20

KHz bandwidth, line mode, 0 dBu input: 0.013 %.
Common Mode Rejection

 at 60 Hz, line mode: –66.5

dB.
Head Room / Input Clip Level

 highest input level be-

fore 1 % TDH+N, Line mode: –.131 % TDH+N @ +20
dBu.
Input Potentiometer

 at 1 KHz, 0 dBu input:

Potentiometer
      at –12 setting: –12.85 dB
      at +20 setting: +20.43 dB
Phantom Supply

 between each signal pin (“+ and “–”)

and ground of each input: 25.77 VDC
Control Port Output Voltage Pins
      5 volt supply (between pins 9 and 10): 4.92 VDC
      10 volt supply (between pins 29 and 28): 10.26 VDC

  Object Number
Dec

Bus Master: Allows manual control of the bus master function. (Normally an internal func-
tion of the Ucode protocol). With this object set, no IQ bus, communication passes through
the IQ-USM 810 Crown bus port.

Send: DA DT CT C0 05 09 01 CS; to master the IQ Bus, open the loop
Response: None
Send: DA DT CT C0 05 00 CS; to unmaster the IQ Bus, close the loop
Response: DA DT AK CT 00 CS; standard ACK

704

$2C0
$C0 $05

768

$300
$80 $06

Display Test Mode: Cycles each section of the display through a known sequence allowing
the operator to verify that all segments and indicators are functional. See Section 4.7 for
known sequence.

Send: DA DT CT 80 06 09 01 CS; To force the preset LED on
Response: DA DT AK CT 00 CS; standard ACK
Send: DA DT CT 80 06 09 00 CS; To set the preset LED in normal mode
Response: DA DT AK CT 00 CS; standard ACK

705

$2C1
$C1 $05

Pushbutton Test: Reads a single byte that is bit mapped to indicate a pushbutton depres-
sion (bit 0 = “SEL” depressed, bit 1 =”

∧

” depressed, bit 2 = “

∨

” depressed):

Send: DA DT CT C1 05 0A CS, To get data
Response: DA DT AK CT C1 05 0C BTN CS