HP 8568B Performance Tests And Adjustments Manual page 142

1. Low-Voltage Power Supply Adjustments
3-28 Adjustments
supply, therefore, if the +5V supply is out of tolerance, a circuit
malfunction is indicated.
17. The -5V indicator A24DS6 (yellow LED) should be lit.
18. Connect the DVM to A24TP7. The DVM indication should be
-5.200 ho.050 V de. The -5V supply is referenced to the +2OV
supply, therefore, if the -5V supply is out of tolerance, a circuit
malfunction is indicated.
19. The -15V indicator A24DS3 (yellow LED) should be lit.
20. Connect the DVM to A24TP4. The DVM indication should be
-15.000 f0.050 V dc. The -15V supply is referenced to the + 20V
supply, therefore, if the -15V supply is out of tolerance, a circuit
malfunction is indicated.