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Important Note!
U13 is
very
static sensitive! Handle with care! It should be
installed last
as
Again, U13 is installed last in this
listed in the order of installation below.
section!
Double check parts orientation with the picture below! Install in the following order:
R72 - 1K
R71 R86 - 10K
R82 - 47K
C119 - 47 pf
C105 C108 C115 C116 C120 - 0.1uF
D10 - MVAM109
– Make sure the flat side of the diode matches that shown in the picture below!
U13 Mounted Last:
U13 - MAX7427CPA – The orientation of this part is shown as mounted below.
Double check the IC
orientation. Do not install it backwards!
Figure 37. U13 and D10 mounted. IC notch and D10 flat side in the vertical direction.
SCAF and Additional Audio Section Tests
Apply the 9v battery voltage. Check voltage across C105 to makes sure it has 2.9v.
Check the voltage across C108 for ~ 1.4v. This should be biased to roughly half of the 2.9v supply
voltage.
Norcal NC2030 v5
12-18-05
Page 40 of 128
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