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©2000 Crown International, Inc.
Maintenance 4-7
130447-1 Rev. A
IQ-USM 810 Service Manual
4.6.20 CHASSIS GROUND
Spec: 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.
4.4.21 HI-POT
Spec: Power Supply withstands Hi-Pot spikes.
Procedure: 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.
4.7 Typical Measurements
Output Noise 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 Hex/ASN1 Description / Command string format
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
4.8 Test/Debug Objects