FR-220
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18
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60. Install C25, .001 uf (marked .001 or 102).
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61. Install C26, .01 uf (marked .01 or 103 or 10nf).
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62. Install L4, the 455 KHz quadrature coil, soldering the two pins
and the two mounting tabs.
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63. Install U2, MC3359 IC. As in the case of the SA602 IC, you
could choose to install an 18-pin IC socket rather than soldering the
IC directly. Re-read the previous discussion of IC sockets offered for
the installation of U1. Larger IC's such as the MC3359 require
considerably more care in socket insertion. Notice that the end of the
IC marked by a band or dot and must be oriented correctly as shown
on the PC parts layout diagram. Solder each of the 18 connections
carefully. Make sure you have good lighting as well as good
technique to make sure that no solder "bridges" flow between the
connections.
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64. Install C22, 100 pf (marked 100 or 101).
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65. Install C16, .01 uf (marked .01 or 103 or 10nf).
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66. Install C17, .01 uf (marked .01 or 103 or 10nf).
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67. Install C21, .01 uf (marked .01 or 103 or 10nf).
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68. Install C18, 220 pf (marked 220 or 221).
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69. Install C19, 22 pf.
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70. Install Y1, the 10.245 MHz. crystal. No special procedure is
required. Simply press the crystal firmly into its holes as far as it will
go, and make good solder connections.
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71. Install FL2, the 455 KHz filter. Its three leads are delicate, and fit
in only one way.
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72. Install C23, .001 uf (marked .001 or 102).
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73. Install C27, 1 uf electrolytic, observe correct polarity.
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74. Install D2, the 1N914/1N4148 signal diode, observe correct
orientation of the banded cathode end. Be sure you correctly
identified D2 and did not confuse it with the varactor diode already
installed.
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75. Install R16, 100K ohms (brown-black-yellow).
Summary of Contents for FR220
Page 8: ...FR 220 8 U2 3359 FR220 BLOCK DIAGRAM U1 SA602 MIXER...
Page 9: ...FR 220 9 FR220 PARTS LAYOUT DIAGRAM...
Page 14: ...FR 220 14...
Page 15: ...FR 220 15...