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©2000 Crown International, Inc.
IQ-USM 810 Service Manual
4-6 Maintenance
130447-1 Rev. A
Procedure:
Set the clock to the current time with the clock write
command.
Send: DA DT CT 80 03 09 CK4 CK3 CK2 CK1 CS; Set
real time clock
Where CK1, CK2, CK3, and CK4 are the four bytes of
the time code.
5.16.2. Allow the IQ-USM810 to operate for > 100 sec-
onds.
Note: other tests may be performed during this time.
Remove TP7-TP8 jumper if in use.
Perform a power cycle on the IQ-USM810.
Note; this may be the same power cycle used for the IQ Bus
Dropout Relay Operation test.
Read the clock and compare its time with the current
time.
Send: DA DT CT 80 03 0A CS
Return String: DA DT AK CT 80 03 0C CK4 CK3 CK2
CK1 CS
Where CK1, CK2, CK3, and CK4 are the four bytes of
the time code.
The two times must be within one second.
4.6.16 IQ BUS MASTER CONTROL
Spec: Hardware can force the IQ Bus high. (Open the
loop)
For this test, perform IQ communication via the Crown
bus.
Procedure:
Send the Master IQ Bus command:
Send: DA DT CT C0 05 09 01 CS; Master IQ bus (Open
loop)
Verify no echo responses on subsequent IQ commands:
Suggested test string: 01 02 03 04 FE FF
Send the normal IQ Bus command…
Send: DA DT CT C0 05 09 00 CS; Unmaster IQ bus
(Close loop)
Verify echo responses on subsequent IQ commands:
Suggested test string: 01 02 03 04 FE FF
Return string: 01 02 03 04
4.6.17 IQ BUS DROPOUT RELAY OPERATION
Spec: IQ Bus remains connected when power is re-
moved.
For this test, perform IQ communication via the Crown
bus.
Procedure:
Power down IQ-USM 810.
Verify IQ messages pass through the unit under test:
Suggested test string: 01 02 03 04 FE FF
Return string: 01 02 03 04
Reapply power to IQ-USM 810.
4.6.18 IQ BUS HUB / DAISY CONNECTIONS
Spec: Both types on IQ Bus connections are functional.
Note: This product has two types of IQ bus connections. The
Daisy type connects the input in one port of the dual RJ-45
and the output in the other. The Hub type connects both input
and output to one RJ-45 port.
For this test, perform IQ communication via the Crown
bus.
Procedure:
For each type of bus connection (Daisy, Hub), perform
at least one of the above tests that require a test on the
IQ response.
4.6.19 SHIPPING STATE RESTORATION
Spec: The IQ-USM 810 is returned to the factory de-
faults.
Note: This section may be skipped when testing a service unit
if it is known that the customer wishes to retain the mixers
settings and presets.
Note: The following steps must be performed as part of the
final power down sequences to ensure the IQ-USM 810 has
been returned to factory defaults and presets. If the IQ-USM
810 is re-powered before packing, the following procedure
should be repeated.
Procedure:
Send the select preset 0 command:
Send: DA DT CT B2 7F 09 00 CS; Select preset 0
Send the load preset command:
Send: DA DT CT B4 7F 09 01 CS; Load preset
Note: The load preset command must be sent within approxi-
mately 2 seconds of the select preset command.
Send the select preset 32 command:
Send: DA DT CT B2 7F 09 20 CS; Select preset 32
Send the load preset command:
Send: DA DT CT B4 7F 09 01 CS; Load preset
Note: The load preset command must be sent within approxi-
mately 2 seconds of the select preset command.
Note: Preset 0 and 32 may also be selected using the front
panel controls.
1) Use the “∧” and “∨” keys to select preset 0. (Display
shows P00.)
2) Press “SEL” switch.
3) Use the “∧” and “∨” keys to select preset 32. (Dis-
play shows P32.)
4) Press “SEL” switch.