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Warning
Because of the high voltage present in this assembly, servicing should be
performed only by qualified personnel.
unregulated power for the IF-Display Section. External power is supplied to the instrument
through Line Module FL1 and Power Transformer AlTl.
Full-wave rectifier CR7 and CR8 provides an unregulated +9 V to AlA +lOO V, +5.2 V
Regulator. LED DSl is lit whenever there is power to the transformer.
Test points TPl and TP2, when jumpered together, cause HPON to go high, turning on the
IF-Display Section in the absence of a signal from the RF Section when power is required for
troubleshooting.
The LINE TRIGGER voltage is selected as required by A3Al Trigger.
The AlA Rectifier board assembly has three versions; HP Part Numbers 85662-60133,
85662-60204, and 85662-60234. Each version changed this circuit.
85662-60133 (Serial Number Prefixes: 2403A-2813A)
Bridge rectifier, Ul, provides an unregulated +118 V to AlA +lOO V, +5.2 V Regulator.
85662-60204 (Serial Number Prefixes: 2816A-3001A)
This bridge rectifier is made of discreet diodes CR13, CR14, CR15, and CR16. This bridge
rectifier provides an unregulated +118 V to AlA +lOO V, +5.2 V Regulator.
85662-60234 (Serial Number Prefixes: 3004A and Above)
This bridge rectifier, made of discreet diodes CR13, CR14, CR15, and CR16, is stacked on the
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