Troubleshooting 47
Table 3-4. Front Panel SA Test
Description: These signatures check microprocessor A3U3 on the front panel board.
Valid A3U4 ROM Firmware Revision: A.01.07
Test Setup: See Figure 3-4 Sheet 2 (for 200 Watt) or Sheet 3 (for 500 Watt) supplies.
1. Turn off the power supply and remove the top cover.
2. To gain access to A3 Front Panel Board, perform steps (a) and (b) of the disassembly procedure for Front Panel
Assembly (See “Disassembly Procedures” later in this chapter).
3. Connect SA jumper between pins 1 and 2 of connector J3 on A3 Front Panel board. Remember the original jumper
position as you will need to restore the jumper to its original position after this test.
4. Connect signature analyzer CLOCK, START, STOP, and GROUND inputs. Be sure to unplug the cable from J2 in
order to access the connector pins.
Signature Analyzer Edge A3 Front Panel Board
Input Setting Connection
5. Turn on the power supply and use the signature analyzer probe to take the following signatures:
Power: 5 V = 3395
Microprocessor: A3U3-15 = 0000 A3U3-29 = l029
A3U3-19 = 552U A3U3-30 = 0295
A3U3-20= 954C A3U3-31 = 0000
A3U3-21 = A552 A3U3-32 = 3395
A3U3-22= 2954 A3U3-33= 0008
A3U3-23 = 0A55 A3U3-34 = 040A
A3U3-24 = 3395 A3U3-35 = 0l02
A3U3-25 = 3395 A3U3-38 = 0002
A3U3-26= 0000 A3U3-39= 0020
A3U3-27= 0000 A3U3-42= 0000
A3U3-28 = 40A5
6. After completing the test, be sure to return the J3 jumper to its original position.
J2-8
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