Agilent Technologies E3620A Manual De Funcionamiento Y Servicio página 85

Table A-8. V2 Preregulator/Control Circuit Troubleshooting (Cont'd)
6 Measure the voltage for pin 14 of U6.
7 Measure the voltage for pin 14 of U7.
8 Measure the voltage from pin 8 to pin 9 of
U7.
a. Low voltage(-12 V).
b. High voltage(+12 V).
a. High voltage(+12 V).
b. Low voltage(-12 V).
a. Measured voltage is positive.
b. Measured voltage is negative.
A-10
a. U4 defective.
b. Proceed to step 7.
a. U6 defective.
b. Proceed to step 8.
a. U7 defective.
b. U5 defective.