Dolby Laboratories 737 - Manual (Page 21)

Model 737 Soundtrack Loudness Meter - Leq(m) Cat. No. 448B Input Adapter Board
3-3
Table 3-2 Connecting the Cat. No. 448B to the CP65 and CP55
Table 3-3 Pin convention
Table 3-4 Pin convention (continued)
3. Mount the Cat. No. 448-B to the CP65 back plane using the spacers provided.
4. Use Table 2-5 to connect the DA10/20 to the positive tags on the Cat. No. 448B
and ground all the negative tags to a 0 V tag on the Cat. No. 448B.
5. Connect the Cat. No. 448B output to the Model 737.
3.4.3 Alignment
1. Thread up and play a length of Cat. No. 69T (US) or Cat. No. 1012 with the
cinema processor placed in Format 10 - Dolby Digital. Connect each channel
to the Model 737 in turn and align the Model 737 in calibration mode for a null-
point at 85 dB (L,C,R, Sw) and 82 dB (Ls, Rs) for each channel.
2. Thread up and play a length of Cat. No. 69T with the cinema processor in
Format 01 - Mono and check that the calibration of the optical pre-amp card
is normal.
3. Select Format 04 - Dolby Stereo. Connect each channel to the Model 737 in
turn (L, R) and adjust RV1 (L) and RV2 (R) trim pots of the Cat. No. 448B to
obtain a null-point at 85 dB for each channel.
4. Check that the Model 737 reads 3 dB higher when in Format 05 than in Format 04
for each channel.
Cat. No. 448B CP65 CP55
From Cat. No. 150 Lt J7 pin L J12 pin 10
From Cat. No. 150 Rt J7 pin J J12 pin 7
MAT & OPT logic lines J13 pin W J6 pin W
SR logic line 0 V (on 448B) 0 V (on 448B)
+15 V J2 pin 5 J15 pin 5
-15 V J2 pin 13 J15 pin 13
0 V J2 pin 9 J15 pin 9
A B C D E F H J K L M N P R S T U V W X Y Z
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
AA BB CC DD EE FF
23 24 25 26 27 28
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