Ramsey Electronics FZ-146 Specifications download pdf (Page 107)

FX-146 • 107

finish or review your work.

 G1a. Insert the 28-pin DIP socket for U6 into its PC board position and

slightly bend the 4 outermost pins to hold it in place.

 G1b. Examine the solder side and verify that ALL 28 pins are extended

into their respective holes.

 G1c. Press the socket squarely onto the board, solder the 4 corner pins,

check for proper seating, then solder remaining pins.

 G2. Install U6, MC145152, checking that all pins are fully seated.

 G3. Install oscillator crystal Y2, 10.240 MHz. Be sure it is firmly seated

on the board, then solder.

 G4. Install C87, 39 pf.

 G5. Install C80, 39 pf.

 G6. Install R38, 10K (brown-black-orange).

 G7. Identify C81, a 35 pf. trimmer capacitor. (Trimmer caps have 2

prongs; trimmer pots have 3.) Press it in place flat on the PC board.

 G8. Solder C81's two connections.

 G9. Identify and install U5, the LM358 dual op amp IC. Be certain to

orient the notched end as pictured on the PC board.

OBSERVE CORRECT POLARITY FOR THESE CAPACITORS:

Due to size constraints, the silkscreened "+" markings for these electrolytic

capacitors may not be apparent on the circuit board. Be sure to check the

parts diagram for proper orientation in placement.

 G10. Install C70, 2.2 uf. electrolytic.

 G11. Install C67, 2.2 uf. electrolytic.

 G12. Install C96, 4.7 or 10 uf. electrolytic.

 G13. Install C90, 2.2 uf. electrolytic.

 G14. Install C92, 2.2 uf. electrolytic.

 G15a. Insert U7, type 74HC283 IC with its notched end correctly

oriented. Solder the 4 outermost pins.

 G16a. Insert and solder U8 as in step G15a.

 G17a. Insert and solder U9 as in step G15a.

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Ramsey Electronics FZ-146 Specifications Page 107