Keyboard, Circuit Description
Keyboard consists of three functional blocks: CRT Controls, Keyboard Switches, and
Status Indicators.
CRT Controls (A)
The CRT Controls include the following front-panel potentiometers:
n
INTENSITY control
Sets the level of the input to
Axis Amplifier.
n
ALIGN screwdriver adjustment
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
or less,
adjusts the frequency of the 18.4 MHz oscillator
Step Gain) to precisely align the IF
to 21.400 MHz.
The front-panel STANDBY indicator, LED DS16, which is driven by the PWR DWN signal
from
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,
through DS15, DS17, and DS18, show the states of the
various keyboard functions. Al5 Controller loads the latches and U2 via the Instrument
Bus
The latch address is decoded in
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
and remove knobs. See Figure 1.
1
Содержание 85662A
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Страница 594: ...HEWLETT PACKARD HP Part No 85662 90085 Printed in USA ...