Kurzweil CUP2 - Audio PCB

Audio PCB
The Audio PCB contains the system power supply, audio power ampliers, and crossover
lters for the CUP2's four speakers.
This is a generic board used in a number of products. However, a substantial number of
components are customized for the CUP2 to match the characteristics of its unique speaker
system. Table 2-1 is a list of these components and their values for the CUP2 Rev C Audio PCB.
Earlier units were manufactured with a Rev B Audio PCB. There are a few instances where the
values differ between Rev B to Rev C. Values listed in parentheses reect the different
component values for Rev B Audio Boards. Table 2-2 is a list of the DNS components
(components not included in either Rev B or Rev C) for the CUP2 version of the Audio PCB.
Ref. Des. Value (Rev B)
C36 .0056uF
C37 .0056uF
C38 .0056uF
C39 .01uF
C40 .0047uF
C41 .22uF
C42 .22uF
C45 .0056uF
C46 .0056uF
C47 .0056uF
C50 .01uF
C51 .0047uF
C52 .22uF
C53 .22uF
C57 1.0uF
C58 47uF
C63 1.0uF
C64 47uF
R103 523
Ohms
R104 523
Ohms
R115 SHORT
R116 SHORT
R14 2.43K
R15 64.9K
(
196K
)
R19 2.43K
R20 64.9K
(
196K
)
R24 255K
R25 255K
R26 300K
R27 300K
R28 300K
R29 300K
Ref. Des. Value (Rev B)
R34 523 Ohms
R35 523
Ohms
R38 470
Ohms
(
1.37K
)
R39 DNS
(
681 Ohms
)
R40 470 Ohms
(
1.37K
)
R41 DNS
(
681 Ohms
)
R42 4.02K
R43 2.43K
R44 48.7k
R45 12.1K
R46 12.1K
R47 11.0K
R48 44.2K
R49 4.02K
R50 2.43K
R51 48.7k
R52 12.1K
R53 12.1K
R54 11.0K
R55 44.2K
R56 750
Ohms
R57 1.50K
R58 45.3K
R60 6.34K
R61 1.58K
(
9.31K
)
R65 750 Ohms
R66 1.50K
R67 45.3K
R69 6.34K
R70 1.58K
(
9.31K
)
U8 NJM4580
DNS 22uF
25V
(
DNS
)
Table 2-1 CUP2 component values
Printed Circuit Boards
Audio PCB
2-9