Crown Audio IQ-USM 810 service manual Error Codes, Troubleshooting FAQs

130447-1 Rev. A IQ-USM 810 Service Manual

4.10 Error Codes

Figure 4.2 shows error codes for the IQ-USM 810.

E01	UART failed system controller power-on self test
E02	RAM failed system controller power-on self test
E03	Application code in flash failed crc test
E04	Flash verify error
E05	Unrecoverable firmware error
E10	Sharc 0 interface hardware error (timeout, etc.)
E11	Sharc 1 interface hardware error (timeout, etc.)
E12	Sharc 2 interface hardware error (timeout, etc.)
E13	Sharc 3 interface hardware error (timeout, etc.)
E14	Sharc 0 failed SRAM test
E15	Sharc 1 failed SRAM test
E16	Sharc 2 failed SRAM test
E17	Sharc 3 failed SRAM test
E18	Sharc 0 failed SDRAM test
E19	Sharc 1 failed SDRAM test
E20	Sharc 2 failed SDRAM test
E21	Sharc 3 failed SDRAM test
E22	Sharc 0 software watchdog timeout
E23	Sharc 1 software watchdog timeout
E24	Sharc 2 software watchdog timeout
E25	Sharc 3 software watchdog timeout

Figure 4.2 IQ-USM 810 Error Codes

4.11 Troubleshooting FAQs

The following FAQs are provided to answer a few ques- tions that may arise in the course of servicing the IQ- USM 810.

Q. What does the display indicate during power up?

A. When the IQ-USM 810 initially powers up, it displays the following:

dSP…810…SH0…SH1…SH2…SH3…Pxx.

This is the boot sequence for the internal processors. Initially, the System Controller processor boots, then it sequentially boots the four DSP processors (SH0-3). After the System Controller processor successfully boots all four DSP processors, audio processing is allowed to begin.

Q. When I power up the IQ-USM 810, it continues to boot. What's up?

A. If the System Controller processor encounters an error

during the boot process, it terminates the process at that point, displays an error code on the front panel, then reboots. See Section 4.10 for a list of error codes.

Q. What is the most common error?

A. Hopefully, no error is common. When “E22” is dis- played as the error code, it is most likely due to a loss of digital audio clocking from the Input board. The short 26-pin ribbon cable carries digital audio and clocking from the Input board to the SHARC board. Check for creation of Master Clock (12.288 MHz), Serial Clock (3.032 MHz), and Frame Clock (48 kHz) by the Input board.

Q. How do I reboot the IQ-USM 810?

A. There are a couple of different ways to reboot the IQ- USM 810. The most straightforward way is to remove the AC power cord from the IEC320 connector on the rear panel, then replace the cord. The loss of AC power

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