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5-118.
Extended Alignment Procedure
5-119.
DVM
1.
2.
3.
4.
Remove the top and bottom covers of the R2001 B.
Connect the R2001 B to a primary power source and turn it on. Allow approximatly 15 minutes warm u
before proceeding with the alignment procedure.
P
Short the center conductor of the DVM Input Jack on the front panel to ground. Connect an external
DVM with a floating input between pin 1 and pin 6 of J3 on the bottom side of the motherboard.
Adjust the Coarse and Fine DVM Zero potentiometers on the Front Panel Interface board (Figure 5-17)
for a reading of 0 ±0.5 mV on the external DVM.
hmTI'"~~~--OVM
ZERO (FINE)
OVM ZERO (COARSE)
K6
K7
KB
Figure 5-17.
DVM Input Buffer Alignment Points
5.
Remove the ground from the DVM Input and connect the DVM Input to TP 12 of the Scope/DVM
Control Board. (Figure 5-18)
Figure 5-18.
Scope/DVM Control Test Point Numbering
6.
Disconnect the external DVM from pins 1 and 6of J3 and connect it to TP 12 of theScope/DVM Control
Board and chassis ground. Note the DVM reading for TP 12.
7.
Reconnect the external DVM between pin 1 and pin 6 of J3. The external DVM should show a reading
equal to one-tenth the voltage at TP 12 noted in paragraph 5-119.6 plus or minus 10 mV. If the reading
falls outside this range it will be necessary to physically disconnect the front panel from the chassis in
order to adjust the DVM Input Gain Potentiometer on the Front Panel Interface Card (Figure 5-17).
Adjust the DVM Input gain for a reading on the external DVM equal to one-tenth the voltage noted for
paragraph 5-119.6. Reconnect the front panel to the chassis.
5-30
5-112.
CRT Horizontal Gain
1.
2.
3.
4.
Connect the Mod Out Jack to the Ext Horiz Jack on the R2001 B front panel.
Set the R2001B for the Generate FM Function and the Scope DC Display. Set the Horiz Control for Ext
Horiz input. Turn the Code Synthesizer off, the Ext Level off, and the 1 kHz Level up about half way.
Connect an oscilloscope with a calibrated vertical input to TP1 on the Scope Amplifier Board.
(Figure 5-13).
Using the front panel Horizontal Vernier Control adjust for a 3 V p-p amplitude on the sinewave at TP1.
5.
With 3V p-p at TP1 adjust the Horizontal Gain Potentiometer (Figure 5-13) for a horizontal trace 6 em
long on the CRT. (Use the front panel controls to position the trace at a convenient place near the
center of the CRT).
5-113.
CRT Vertical Gain
1.
Connect the Mod Out Jack to the Vert Input Jack on the R2001B front panel.
2.
Set the R2001B for the Generate FM Function and the Scope DC Display. Set the Horiz Control for
1 mSec/Div sweep rate and the Horizontal Vernier to the Cal position. Set the Vert Control for 1 V/Div
input sensitivity and tt)e Vertical Vernier to the Cal position.
3.
Turn the Code Synthesizer off, the Ext Level off and the 1 kHz Level up about half way.
4.
Connect an oscilloscope with a calibrated vertical input to TP4 on the Scope Amplifier Board. (Figure
5-13).
5.
Using the front panel 1 kHz Level Control adjust for a 3V p-p amplitude on the sinewave at TP4.
6.
With 3V p-p at TP4 adjust the Vertical Gain Potentiometer (Figure 5-13) for a 6 em p-psinewave on the
CRT. (use the front panel Position Controls to center the waveform on the CRT).
5-114.
Vertical Input Gain
1.
Set the R2001 B for the Generate FM Function and the Scope DC Display. Set the Horiz Control for 1 rn
Sec/Div sweep rate and the Horizontal Vernier to the Cal position. Set the Vert Control for 1 V /Div input
sensitivity and the Vertical Vernier to the Cal position.
2.
Connect an oscilloscope with a calibrated vertical input to the Mod Out Jack on the front panel.
3.
Turn the Code Synthesizer off, the Ext Level off and adjust the 1 kHz Level Control for
a
6 V p-p
sinewave on the attached oscilloscope.
4.
Disconnect the oscilloscope from the Mod Out Jack and connect the Mod Out Jack to the Vert Input
Jack on the R2001 B.
5.
Adjust the Input Vertical Gain Potentiometer on the Front Panel Interface Board (Figure 5-14) for a 6
ern p-p sinewave on the CRT. (Use the front panel Position Controls to center the waveform on the
CRT.)
5-27
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