A.5 conformal coating, Conformally coated area – Digi RCM4000 User Manual
Page 94
88
RabbitCore RCM4000
A.5 Conformal Coating
The areas around the 32 kHz real-time clock crystal oscillator have had the Dow Corning
silicone-based 1-2620 conformal coating applied. The conformally coated area is shown
in Figure A-5. The conformal coating protects these high-impedance circuits from the
effects of moisture and contaminants over time.
Figure A-5. RCM4000 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 Technical Note 303, Con-
formal Coatings.
Conformally coated
area
R34
C8
C7
C9
C12
C14
L6
L7
C15
C1
1
L5
L4
R20
J2
C41
R35
DS1
DS2
R37
R36
ACT
LINK
C72
Y3
C71
U17
C66
R46
U18
R47
C53
C54
C52
C51
C50 C49
C47
C48
U7
C42
C43
U6
C34
C35
Y1
U5
R25
C33
R24
C20
Q1
T1
C18
L3
R7
R6
L2
C16
C13
L9
L8
R5
R4
R3
R1
R2
R8
R51
C10
U1
R9
R10
JP1
JP3
JP2
U3
C22
C23
RP2
R43
D1
R27
R28
JP4
R33 R32
R31
Y2
R48 C55
C56 C46 C45C44
U9
R30
C38
U8
C36
R26
C32
C30
C31
R29
C29
C28
C26
C27
C24
C25
J1