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98770 Diagrams
9-9
Power Supply Assemblies
The power supply assembly (98770-67980) is an exchange item; however, here is a list of the power
supply PC assemblies and the circuits found on each assemblv.
98770-66507 (A7) Primary Assembly
Degauss
Energy Storage Circuit (less 2 big capacitors)
Switching transformers
Switching regulator filter inductors
Surge limit relay
98770-66508 (A8) Filter Capacitor Assembly
Filter capacitors for the output voltages of the switching regulators. Voltages enter the 98770
motherboard via this assembly.
98770-66509 (A9) Control Assembly
Filament supply rectifiers and filter
Regulators for filament, ± 15 INT and
+
12 supplies
Pulse width modulators
Frequency response shaping
HSYNC synchronizer (phase-locked loop)
Voltage/ current sense
LED indicator drivers
98770-66515 Switching Assembly
Current sense transformers
Switching transistors for the switching regulators
98770-66516 Rectifier Assembly
Rectifiers for the switching regulators
I
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