GAI-Tronics 12250-001 VLC Kit - Manual (Page 5)

Pub. 42003-109E
M ODEL 12250-001 V OLUME L EVEL C ONTROL R ECEIVER A SSEMBLY R EPLACEMENT K IT Page: 5 of 7
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9. Orient the PCBA with the connector at the top.
Note: Step 10 is applicable for models that have R14 installed in the off-hook detection circuitry. See
applicable models and associated boards in Figures 4A, 4B, and 4C for listing.
10. Replace R14 by de-soldering and removing the old resistor (10,000 ohm, ¼ watt, 5%
[brown-black-orange-gold]). Insert the 4,700 ohm, ¼ watt, 5% (yellow-violet-red-gold] resistor
provided in this kit into the PCBA, and re-solder it. Trim the resistor leads to avoid possible shorts
after re-assembly. See Figure 4.
11. De-solder and remove the W-3 jumper (0-ohm resistor) between E25 and E26. See applicable model in
Figure 4.
12. Remove solder from the following pads with a solder remover tool. If a solder remover tool is not
available, use a solder wick to remove the solder: E23, E24, E25, E26, E28, and E31.
Note: P1 connections do not require removing the solder. Heat the pin with the soldering iron, and
push the wire in.
Re-assembly
13. Wire connections from the VLC are to be soldered to the PCBA. See applicable model and PC board
in Figure 4.
Note: “E” locations may vary slightly from what is shown in Figure 2; however, the connections
remain the same.
Black E28
Red E31
Brown E24
White E26
Green E23
Yellow E25
Red/Blue P1 (L1) Refer to applicable model and PC board in Figure 4.
Blue/Red P1 (L2) Refer to applicable model and PC board in Figure 4.
14. Replace the PCBA by inserting the amphenol connector in the chassis opening and pressing it into
place. Push the standoffs through the chassis, and retighten the 2 screws holding the amphenol
connector to the chassis. Reinstall the Model 69072-001 PCBA, if applicable.
15. Connect the purple wire from the front panel to E7 on the PCBA, if applicable. On PCBA assemblies
69701-008, 69701-014, and 69701-015, connect one of the magnetic reed hookswitch wires from the
front panel to E7 on the PCBA. Connect the other wire to E5 on the PCBA. On PCBA assemblies,
(new Model 69701-007, 69701-008, 69701-009, 69701-011, 69701-014, and 69701-015) ensure that
the clip is bent inward to the board to prevent shorting any adjacent component.
16. Place the VLC mounting flange between the chassis and the PCBA, and align it with the holes. Insert
two 6-32 x ¼-inch screws, and tighten them. Recheck the purple wire at E7 of the PCBA for clearance
from adjacent components, if applicable.