2-14
Cat. No. 242 Pin 19 to Cat. No. 441 Pin 10
Cat. No. 242 Pin 17 to Cat. No. 441 Pin 11
Cat. No. 242 Pin 16 to Cat. No. 441 Pin 12
Cat. No. 242 Pin 9 to Cat. No. 441 Pin 3
Cat. No. 441 Pin T to S
Cat. No. 441 Pin K (gnd) to S
Cat. No. 441 Pin 7 to TB3 Pin 1 (Rs Out)
Referring to the fold-out on page 2-17:
DA20 cable light blue wire to Cat. No. 441 Pin M (Rs Input)
DA20 cable white wire to Cat. No. 441 Pin R (digital SW Input)
In addition, ground TB3 pin 2 to the circuit ground at TB3 pin 4. This arrangement
provides muting of the Rs output when in bypass and is necessary to prevent loud
thumps when power to the CP55 is turned on.
The Rs output is now conveniently available at TB3 pin 1. NOTE: the output labeled “S”
on the CP55 is now the Ls output.
When any format but Dolby Digital is selected, the
mono surround signal feeds both surround outputs.
The two inputs from the DA20 (Rs and SW) will have to be soldered directly to the
indicated backplane pins of the Cat. No.441. As the cable plugs in to the DA20 end of
things, it will still be possible to disconnect the units from each other without soldering.
The subwoofer output on the CP55 is called B/E (bass extension) and is found at TB3
pin 12.
It will now automatically select either the optical input or the Dolby Digital input
according to the format selected by the front panel switches or remote control inputs.
In order to get the correct input level from the Cat. No.85C pink noise generator, two
more modifications are needed. First, cut the trace that leads from the Cat. No.441 socket
pin D toward your right. Solder a wire from the side of the cut trace away from the Cat.
No.441 to Cat. No.441 pin A. Next, connect a 105K resistor (furnished) between Cat.
No.441 connector pins A to D.
Warning: The subwoofer pink noise level in a CP55 so modified but with a Cat. No.241
plugged in will now be 20 dB too low, although the Cat. No.241 will otherwise do just
what it used to do.
