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Status Indicators.
CRT Controls (A)
The CRT Controls include the following front-panel potentiometers:
INTENSITY control Rl. Sets the level of the input to AlA 2 Axis Amplifier.
n
ALIGN screwdriver adjustment R8. Sets the CRT trace to horizontal.
n
FOCUS screwdriver adjustment R2. Focuses the CRT trace.
n
FREQ ZERO screwdriver adjustment R3. For resolution bandwidths of 1 kHz or less,
n
adjusts the frequency of the 18.4 MHz oscillator (A4A5 Step Gain) to precisely align the IF
The front-panel STANDBY indicator, LED DS16, which is driven by the PWR DWN signal
from AlA f15 V Regulator, is activated when line power is applied while the power supply
regulators are off.
Keyboard Switches (B)
The Keyboard Switches are a matrix of rows and columns connected to the RF Section
keyboard by the 50-wire Instrument Bus W8. When a keyboard switch is activated, Al5
Controller recognizes the switch and performs the indicated operation.
Status Indicators (C)
The 17 Status Indicators, LEDs DSl through DS15, DS17, and DS18, show the states of the
various keyboard functions. Al5 Controller loads the latches Ul and U2 via the Instrument
Bus W8. The latch address is decoded in A3Al Trigger, which generates the ICLK strobe
signal.
Front-Panel LED Replacement
1. Set instrument LINE switch to STANDBY.
2. Loosen set screws in INTENSITY control and Video Trigger LEVEL control knobs @ and
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