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6.3 Conformal Coating
The areas around the crystal oscillator and the battery backup circuit on the CPU Card
have had the Dow Corning silicone-based 1-2620 conformal coating applied. The confor-
mally coated areas are shown in Figure 22. The conformal coating protects these high-
impedance circuits from the effects of moisture and contaminants over time.
J3
C19
C23
C24
C25
U10 C27
C28
U6
C26
J6
J7
Conformally
coated area
R5
C4
C7
Y1
R11
R12
C11
R17
C18
J4
J4
C35
C46
C49
C1
C2
R2
C15
RP4
U8
C53
U14
U1
C21
U9
C31
C36
C41
J8
Y3
RT1
R4
C3
R1
R3
U3
C16
J5
J5
C32
C33
D3
D5
D1
D2
Y2
C10
R13
C13
R21
R23
Q1
R26
Q3
BT1
R42
Battery
Figure 22. CPU Card Areas Receiving Conformal Coating
Any components in the conformally coated area may be replaced using standard soldering
procedures for surface-mounted components. A new conformal coating should then be
applied to offer continuing protection against the effects of moisture and contaminants.
NOTE: For more information on conformal coatings, refer to Rabbit Technical Note
TN303, Conformal Coatings .
66
Smart Star (SR9000)
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