BS-1
•
16
installed by reheating each solder pad while holding the cartridge in place.
Once installed, you may want to touch-up each joint with a bit more solder
to ensure a solid connection.
59. Check once again to be sure that the two leads do not touch the outer
chrome case of the MIC1 and also that the case does not contact the circuit
board. A short in this area will prevent the Microphone input from working.
60. Install R12, 10K ohm potentiometer (marked 10K). Solder all five points.
If everything looks good, it’s time to install the three remaining parts.
61. Carefully insert the voice recorder IC U2 into the socket, taking care
that ALL 28 pins get into their proper holes. The orientation of the notched
end, as shown on the Parts Layout Diagram is
critically
important.
62. Install the microprocessor U4 into the socket. This is the 16 pin IC with
the sticker. Once again, check for proper orientation of the notched end.
Double check all pins to make sure none are bent under. A little time spent
here can save a lot of grief later!
63. You should still have one 10K ohm
resistor left. This is to be soldered on the
bottom side of the PC board, from pin 23 of
U2 to the positive side of C2. Follow the
diagram for correct placement.
That’s it! All components should be installed.
Before applying power it would be a good idea
for one last glance over the entire pc board.
Check for:
•
Missed solder joints.
•
Solder shorts between components. Check your schematic and parts layout
diagrams if you suspect a fault.
•
Proper orientation of diodes, capacitors, and ICs.
•
Ensure proper power supply polarity and voltage. (12 volts DC, center tip
positive)
INITIAL TESTING AND OPERATION
Power Supply Considerations
The BS1 is designed to run off an external source of 9 to 15 VDC. Batteries,
power supplies, or AC adapters may be connected to the unit through the
power jack, J5. Care should be taken to ensure that the center tip is positive.
Before applying power, make sure the three pushbutton switches are in the
“out” position and the volume control is turned down.
10K
