48 Troubleshooting
Table 3-5. Secondary Interface SA Test
Description: These signatures check the secondary microprocessor AlU504.
Valid AlU504 ROM Firmware Revision: A.01.03
Test Setup: See Figure 3-4 either Sheet 2 or Sheet 3 as applicable to your model.
1. Turn off the power supply and remove the top cover.
2. Connect signature analyzer CLOCK, START, STOP, and GROUND inputs and setup as follows:
Signature Analyzer Edge A1 Board Connection
Input Setting
3. To place the secondary interface in the SA mode, turn on the power supply while momentarily (for 2 seconds) shorting
A1U504-1 to A1U504-20 (common).
4. Use the signature analyzer probe to take the following signatures:
Power: 5 V = 1C4C
Microprocessor: AlU504-1 = F77H AlU504-21 = 5PC7
AlU504-2 = C98P AlU504-22 = 5PC7
AlU504-3 = 1573AlU504-23 = 5PC7
AlU504-4 = P42A AlU504-24 = 6CAP
AlU504-5 = UHF8 AlU504-25 = A319
AlU504-6 = F5UC AlU504-26 = A319
AlU504-7 = UH8C AlU504-27 = A319
AlU504-8 = 23UC AlU504-28 = 5PC7
AlU504-9 = 0000AlU504-29 = 1C4C
AlU504-10= 1C4C AlU504-30= 0000
AlU504-11 = 1C4C AlU504-31 = 1C4C
AlU504-12 = C76F AlU504-32 = 0000
AlU504-13= U042 AlU504-33 = 0000
AlU504-14 = 2189 AlU504-34 = 0000
AlU504-15 = 1C4C AlU504-35 = 0004
AlU504-16 = 1C45 AlU504-36 = 0UP7
AlU504-17 = 0010 AlU504-37 = UF7P
AlU504-18 = 0000 AlU504-38 = CP47
AlU504-19 = 1C4C AlU504-39 = CP47
AlU504-20 = 0000 AlU504-40 = 1C4C
5. After completing the tests, be sure to return the J3 jumper to its original position.
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