FX 146
•
90
STAGE DR ASSEMBLY:
Be very attentive to capacitor values (in picofarads) and to coil descriptions
throughout this section.
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DR1. Correctly identify and install PIN diode D6. It is the only BA479
used in the circuit, and its number is stamped plainly on the diode body.
Be sure to orient the cathode end correctly!
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DR2. Install L17, 2.2 uH in upright position with the inductor's body in the
designated hole. This is a molded inductor, resembling a resistor but is
larger. Look for 2 red bands on its body.
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DR3. Because it must dissipate slightly more power, resistor R54 is
larger than most of the resistors used in this circuit. Its value may be 200
or 220 ohms (red-black-brown, or red-red-brown). Install R54 in upright
style.
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DR4. Install C47, 100 pf (marked 100 or 101).
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DR5. Install R28, 470 ohms (yellow-violet-brown).
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DR6. Install C25, 100 pf (marked 100 or 101).
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DR7. Install C27, 8.2 pf disc (marked 8.2).
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DR8. Install D4, type 1N914 or 1N4148. Orient the cathode band
correctly.
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DR9. Install C53, .01 uf disc capacitor (marked .01 or 103).
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DR10. If you think that transistor Q3, type NE021,
is tiny, wait until you install C75, the SMT
(Surface Mount Technology) or "chip" capacitor
at Q8, the Transmit Final Amp! Study the drawing
and Q3 itself before removing the device from its
protective paper.
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DR11. The longest of the three leads is the
collector, which points to R12, as pictured.
Remove Q3 from its adhesive paper, bend all three leads down 90
degrees, and insert as illustrated.
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DR12. After making sure that the body of Q3 is snugly against the PC
board and correctly oriented as shown above, solder and trim all three
wires. That's all there is to it!
FX-146
•
57
[ ] [ ] R16
47K
DR13
[ ] [ ] R17
470 ohm
DR14
[ ] [ ] R18
270 ohm
E7
[ ] [ ] R19
10K
E13b
[ ] [ ] R20
270
F5
[ ] [ ] R21
470
M33
[ ] [ ] R22
10K
E6
[ ] [ ] R23
100 ohm
F6
[ ] [ ] R24
10K
CR5
[ ] [ ] R25
47K
E18
[ ] [ ] R26
51 ohm
F3
[ ] [ ] R27
47K
F4
[ ] [ ] R28
470 ohm
DR5
[ ] [ ] R29
100 ohm
TX6
[ ] [ ] R30
51 ohm
E5
[ ] [ ] R31
47K
M39
[ ] [ ] R32
82 (1/2W)
TX48
[ ] [ ] R33
47K
M40
[ ] [ ] R34
270 ohm
TX13
[ ] [ ] R35
100K
E20
[ ] [ ] R36
10K
TX11
[ ] [ ] R37
100K
M13
[ ] [ ] R38
10K
G6
[ ] [ ] R39
47K
M30
[ ] [ ] R40
100K
M26
[ ] [ ] R41
not used
[ ] [ ] R42
2.2K
A20