Motorola R-2001A Service Manual page 68

5-112. CRT Horizontal Gain
1. Connect the Mod Out Jack to the Ext Horiz Jack on the R2001A front panel.
2. Set the R2001 A 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 offhand the 1 kHz Level up about half way.
3. Connect an oscilloscope with a calibrated vertical input-to TP1 on the Scope Amplifier Board.
(Figure 5-13).
4. 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 cm
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 R2001A front panel.
2. Set the R2001A 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 the 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 cm p-p sinewave 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 A for the Generate FM Function and the Scope DC Display. Set the Horiz Control for 1 m
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 R2001A.
5. Adjust the Input Vertical Gain Potentiometer on the Front Panel Interface Board (Figure 5-14) for a 6
cm p-p sinewave on the CRT. (Use the front panel Position Controls to center the waveform on the
CRT.)
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