2-43
2.5.3 Installation of DA20 with CP200
Refer to the CP200 wiring diagram fold-out, Figure 2.11. The lengths of cable in the
wiring harnesses furnished assume that the DA20 will be mounted directly above the
CP200 and associated MPU. It will be necessary to remove and set aside the ribbon
jumper cable that goes from CP200 JM11 to JM21. Note that removing this jumper
interrupts the signal path for all channels except the subwoofer. If the DA20 is
subsequently removed for any reason, the D-connectors at the ends of the new cables
that connect to JM11 and JM21 must be connected to each other to re-establish the
audio path.
In addition to the audio signal connections, the control logic must be connected between
the units. These connections are shown in Figure 2.11.
In order for the auto digital feature to operate, the DA20 must be equipped with a Cat.
No.611A card. The DA20 also needs the ability to assert each of the four CP200 format
selections to determine which format selector is assigned format 10 and when detected,
assert format 10 when appropriate. This is accomplished via the Cat. No. 493 Auto
Digital Adapter card which is mounted to connector BS21 on the rear panel of the CP200
Control unit. The Cat. No. 493 contains the circuitry required to allow the DA20 to assert
each of the four format selections and to feed back when format 10 is detected.
Additionally, there are four wires which must be either soldered to or attached to barrier
strips on the CP200 control unit backplane. See the information supplied with the Cat.
No. 493 card for details on attachment of these wires.
In order for the subwoofer to work with the DA20, a replacement for the Cat. No.160 is
required. This card is called the Cat. No.560 and is based on the Cat. No.441 subwoofer
and surround card used in the CP65. In addition to subwoofer processing, is offers two
channels of surround equalization.
To make full use of the available dynamic range of the Dolby Digital format, the CP200
requires an improved output fader card. The Cat. No.517 has been designed to fulfill this
requirement and its installation in any CP200 used to play Dolby Digital films is highly
recommended.
Backplane modifications for Cat. Nos.560 and 517 are shown in Figure 2.14 or 2.15.
The Cat. No. 153 Optical Format card from the CP200 control unit must be modified to
allow the DA20 to detect the assertion of the various film formats and thus assert format
10 when appropriate depending on the operating mode of the DA20. The programming
of the Optical Format card assumes that an SRA5 is installed with the CP200 for proper
reversion to the Dolby SR analog soundtrack.
Remove the Cat. No.153 Optical Format Card from the CP200 Control Unit and install the
diodes as follows:
Format Bus Lines
1,4,13,17,26,29,31
Diode Locations
98,103,112,116,125,128,292,388,484
Use a low wattage soldering iron and ensure that there are no solder bridges when
finished. Inspect the installed diodes for correct polarity. Reinstall the Cat. No.153 in the
CP200 control unit.
