Ramsey Electronics MX10 - Manual (Page 14)

MX10 Page 14
❒ 59. Install R89, a 68K ohm resistor (blue-gray-orange).
❒ 60. Install R43, a 100K ohm resistor (brown-black-yellow).
❒ 61. Install R67, a 180 ohm resistor (brown-gray-brown).
❒ 62. Install R76, a 10K ohm resistor (brown-black-orange).
❒ 63. Install R77, another 10K ohm resistor (brown-black-orange).
❒ 64. Install R51, a 10K ohm resistor (brown-black-orange).
❒ 65. Install R49, a 10K ohm resistor (brown-black-orange).
❒ 66. Install R68, a 2.0 ohm resistor (red-black-gold).
❒ 67. Install R61, a 10K ohm resistor (brown-black-orange).
❒ 68. Install R63, a 10K ohm resistor (brown-black-orange).
❒ 69. Install R69, a 2.0 ohm resistor (red-black-gold).
❒ 70. Install R93, a 1K ohm resistor (brown-black-red).
❒ 71. Install U3, one of the LM386 audio amplifier ICs. This IC and U2 are
responsible for amplifying the line level of the audio in this circuit to a low
impedance so that it can drive a pair of earphones. Make sure the notched
end is oriented properly, then solder all 8 pins.
❒ 72. Install U2, the other LM386 audio amplifier IC. Again make sure the
notch is installed in the correct orientation. Solder all 8 pins.
❒ 73. Install R35, a 1K ohm resistor (brown-black-red).
❒ 74. Install R41, a 1K ohm resistor (brown-black-red).
❒ 75. Install R59, a 1K ohm resistor (brown-black-red).
❒ 76. Install R47, a 1K ohm resistor (brown-black-red).
❒ 77. Install D29, a 1N4002 type rectifier diode. (black body with white
stripe). This diode combined with D35, 34, and 31 form a bridge rectifier
which converts AC to DC to form our power supply. Be sure to install the
end with the line in the same orientation as shown.
❒ 78. Install D35, a 1N4002 type rectifier diode. (black body with white
stripe). Again note orientation.
❒ 79. Install D34, another 1N4002 type rectifier diode. (black body with white
stripe).
❒ 80. Install D31, the last of the 1N4002 bridge rectifier diodes. Again check
its orientation before installing. (Black body with white stripe).
Now we will move on to the higher profile components such as capacitors,
switches and jacks. Before continuing we want to check all of our solder joints
for possible solder bridges and cold solder joints. Now for ease of locating