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Figure 30. Installed parts for this section of LDO regulators. Note the black band orientation on the electrolytic caps.
Install U11 part number LP2985-2.9
(marked
LAXB), the top most voltage regulator, which is a 2.9v
low dropout (LDO) voltage regulator. ICs can be difficult to tell if all the pins are properly soldered
down. Refer to the earlier hints on installing ICs.
Install U1 and U10, part number LP2985-5
(marked
LOUB), which are 5v low dropout (LDO) voltage
regulators. These two regulators are the middle and bottom set of regulators. ICs can be difficult to tell
if all the pins are properly soldered down. Refer to the earlier hints on installing ICs.
Install C7, C99 and C101, 0.01uf capacitors.
Install C8, C100 and C102, 2.2uF X7R capacitors.
Install C96 and C97, 22uF
16V
polarized capacitors. There are both 16v and 25v 22uf caps.
Make sure
to use the 16v
parts. These are polarized capacitors,
so make sure they are installed with the correct
polarization. The black stripe on the top of the cap matches with the stripe on the outline on the board.
Electrolytic caps can be a bit difficult to install. Pre-tin both pads. Then place the cap on the pads and
heat the cap leads until the solder melts. When both pins are soldered,
gently
rock the cap to make sure
it is completely soldered down.
Install C1, a 22uF
25V
polarized capacitors. This 25v cap is physically large compared to the smaller
caps used above at C96 and C97. Make sure you use the right
25v
cap. These are polarized capacitors,
so make sure they are installed with the correct
polarization.
Norcal NC2030 v5
12-18-05
Page 34 of 128
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