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A30 Front Panel board
A60 DC DC board
Power Supply
A5 DISPLAY board
Fan
WFM 1125 Option 0A/0B/0C/0D Service Manual
The A30 Front Panel board drives the buttons, knobs and LEDs. User selections
from the front panel are sent to the A20 Main board, and the commands from the
A20 Main board control the LEDs on the front panel.
The A60 DC-DC board generates the -2, -5, +1.2, +3.3, and +12.5 V power
supply voltages from the +5 V power supplied from Power Supply, and sends
them to the other boards.
The Power Supply generates the +5 V power supply voltage from the AC line,
and sends it to the A60 DC-DC board and A20 Main board.
The principal Power switch, located on the rear panel, controls all power to the
waveform monitor including the Power Supply.
The A5 DISPLAY board is a VGA driver that drives the VGA monitor. The
VGA signal is supplied through the A20 MAIN board's J390 connector.
The fan provides forced air cooling for the waveform monitor. It connects to
+12.5 V from the A60 DC-DC board.
Theory of Operation
3-5
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