5-99. Alignment Procedure; Introduction; 5-102. Test Equipment Required; Preparation For Alignment - Motorola R-20018 Manual

A 12 FRNT PNL A3 SCOPE/ DVM CONTROL
INTERFACE
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8521-38
Figure 5-12. Sinad Meter Block Diagram
5-99. ALIGNMENT PROCEDURE
5-100. Introduction
5-101. This section provides a basic (para 5-105) and an extended (para 5-118) alignment procedure.
The basic procedure requires only the use of a calibrated oscilloscope. It is expected that the basic alignment
be performed whenever service work is performed. The extended alignment procedure requires module
extenders and a calibrated digital voltmeter in addition to the oscilloscope. The extended procedure should be
performed as required alter servicing the system. All adjustments not covered in this procedure are to be
performed on suitable module test fixtures only.
5-102. Test Equipment Required
5-103. The test equipment or its equivalent listed in table 5-3 is required for the basic procedure. The
additional equipment required for the extended procedure is listed in table 5-4.
Table 5-3. Basic Test Equipment Required
Description
Model
·Oscilloscope
Motorola R1004A
Test Point Shorting Jumper
Nonmetallic Alignment Tool
·An R2001 is a suitable subsitute
5-24
Table 5-4. Extended Test Equipment Required
Description Model
• Oscilloscope
Motorola R1004A
·Digital Voltmeter Motorola R1001A
• RF Signal Generator Motorola R1201A
·Modulation Meter Boonton 82AD
Receiver Test Cover
Motorola 15-P01324V001
Extender Card Set
Motorola 67-P01322V001
·An R2001 is a suitable for use in place of these separate equipments.
5-104. Preparation for Alignment
1. All alignments to be performed at normal ambient temperature.
2. Remove the top cover of the unit to be aligned.
3. Apply power to the unit to be aligned and allow a warmup time of 15 minutes prior to alignment.
5-105. Basic Alignment Procedure
5-106. CRT Astigmatism and Geometry
1. Select the Monitor Function and the Gen/Mon Mtr Display on the R2001 B. Set the Intensity Control for
a medium intense display.
2. While using the Focus Control to maintain a focused display at the center of the CRT, adjust the
Astigmatism and Geometry potentiometers (Figure 5-13) for the best focus at the outer edges of the
CRT while minimizing the pincushion and barrel distortion of the display. The two adjustments are
interactive so that repeated small adjustments alternated between the two potentiometers will be
required to obtain the best display.
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GAIN
5-25