HP 8114A - Output Board; Onboard Regulators; Fixed Supply; Floating Supplies

HP 8114A Service Guide
Output Board
Note I
!I
Warning
9
Onboard Regulators
Some parts of this board consist of data-controlled devices and
troubleshooting is reduced to replacing suspect devices. Other parts of
the board use SMT. However, basic checks can be performed on some
parts of the circuitry:
To make measurements on the output board the hybrid module
guiding shield has to be removed.
Floating voltages up to + 145 V are present. This can be
dangerous to life. Care should therefore be taken during the
measurements.
Check the power supplies re-generated on the output board.
F’ixed Supply
At TP109 there should be + 5 VANA measured against AGND at Cl 19
Floating Supplies
Measure the floating voltages against floating ground (FLGND). FLGND
can be accessed at TP106.
5-16 Troubleshooting