Dolby Laboratories 737 - Manual (Page 20)

Model 737 Soundtrack Loudness Meter - Leq(m) Cat. No. 448B Input Adapter Board
3-2
3.3 Component and Connector Layout
Figure 3-1 Cat. No. 448B Interface Adapter
3.4 Preview Theatre
3.4.1 Concept
The DA10 or DA20 feeds six Dolby Digital channels; the Cat. No. 150 supplies two.
Since the DA10/20 output is unbalanced, the positive tags should be used and the negative
tags grounded. To ensure that the auxiliary two-track input is used in matrix mode, the
MAT and OPT logic lines should be paralleled together and fed from the CP65 logic.
Additionally, the SR logic line should be permanently grounded to disable the 3 dB
attenuation on L, R of the six-track input to ensure sufficient gain.
3.4.2 Installation
Figure 3-2 Installation of Cat. No. 448B
1. Before mounting the Cat. No. 448B, ensure the jumpers LK1-4 are in the upper
(1&3) position.
2. Connect the Cat. No. 448B with the cinema processor using Table 3-2 and
adhere to the pin conventions in Table 3-3 and Table 3-4.
Lt Rt
GND
Lt Rt OPT MAT SR +15 -15 0V
CAT150 TO DS4E
L+ L- C+ C- R+ R- Ls+ Ls- Rs+ Rs- Sw+ Sw-
FROM DA20 / MON BUSS
C+ L+ L-
TO MODEL 737
Ls+ R+ C- R- Rs+ Ls- Rs- Sw+ Sw-
R1 R2 R4 R5
R6 R7 R9
R1
0 R1
1 R1
2 R1
3 R1
4
R3
R8
FROM SIG
SW
2
J3
J2 J1
R22
SW
1
SW
4
SW
3
IC1
R26
R20
R27
R25
R19
R24
R15
R17
R16
R18
R21
IC2
R23
D1
C3
C2 C5
C4 C1 RV2
RV1
LEFT
RIGHT
LK
1 LK
2 LK
3 LK
4
Lt, Rt
2 & 3
Lt, Rt
1 & 3
(LK1-4)
(LK1-4)
CAT. NO. 448B
R28
R29
INTERFACE ADAPTOR FOR MODEL 737
A2A7463 REV A
D A 1 0 /2 0
C a t. N o. 4 4 8 B
C P 6 5
x2 (L t/R t - o pt)
x6 (u nbalanced)
M od e l 7 3 7
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