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5500A
Service Manual
1010 (DDE:FR ) A6 ACV loop fault
Assuming the dc voltage tests pass, there are a number of A6 ICs associated with ac
voltage that could be suspect. These include U5, U55, U61, U62, U13, U4, U35, U32,
U49, U25, U96, U40, U20, U39, U84 and U3.
1011 (DDE:FR ) A6 33 mV divider fault
Suspects on the A6 assembly are resistor network Z8 and relay K7.
1012 (DDE:FR ) A6 330 mV DC fault
Suspects on the A6 assembly are resistor network Z8 and relay K7.
1013 (DDE:FR ) A6 +3.3V DC fault
Suspect ICs on the A6 assembly are U21, U57, U15, U60, U87, U48, and U42. These
ICs are tested in previous test near 0 V. This test exposes failures at full scale positive.
1014 (DDE:FR ) A6 -3.3V DC fault
Suspect ICs on the A6 assembly are U21, U57, U15, U60, U87, U48 and U42. These ICs
are tested in previous test near 0 V. This test exposes failures at full scale negative.
1015 (DDE:FR ) A8 33V DC fault
Suspect components on the A8 assembly include U1, Q1 through Q4, Q6, Q16, Q17,
R10, R13, and R17 through R19.
1016 (DDE:FR ) A6 33 mV AC fault
Suspects include U41, U57, U21, and Z8 on the A6 assembly.
1017 (DDE:FR ) A6 330 mV AC fault
Suspects include U41, U57, U21, and Z8 on the A6 assembly.
1018 (DDE:FR ) A6 3.3V AC fault
Assuming the ACV LOOP test passes, suspect ICs include U41, U57, U21, and U87.
1019 (DDE:FR ) A8 33V AC fault
Suspect components on the A8 assembly include U1, Q1 through Q4, Q6, Q16, Q17,
R10, R13, and R17 through R19.
1020 (DDE:FR ) A6 vloop error amp fault
The primary suspect IC is U60. Other possible suspects include U15 and U48, all on the
A6 assembly.
1021 (DDE:FR ) A6 3.3V amp fault
The primary suspect IC is U42. Another suspect is U48, both on the A6 assembly.
1022 (DDE:FR ) A6 polarity inverter fault
The primary suspect IC is U87 on the A6 assembly.
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