Installation manual

DTS-6 Installation Manual Section 6: Troubleshooting
6-1
VI TROUBLESHOOTING
INSIDE THE DTS-6. See Figure 6
•
••
• D-426 TRANSFORMER BOARD
See drawing D426. Located on this board is the 50-pin output connection,
transformers, relays, and split/mono surround switches. Output of all channels leave
from this card. Subwoofer is also carried on the “stereo” cable.
The newest boards have three dip switches, all grouped together and located towards
the top and rear of the board. These dip switches are either all up for stereo or all down
for mono surrounds.
Older boards had three shunts to change to split or mono surround. All three shunts P1,
P2, and P3 are clearly marked split or mono. The shunts are not grouped together, P1
and P2 shunts are located near the top rear of the board. The P3 shunt is located at the
front of the board just next to the first transformer towards the top. It is not necessary
to remove the board to change shunt positions, but using needle nose pliers will make
it easier to grab them securely.
•
••
• D-421 MEZZANINE BOARD
The D-420 and D-421 come as a set. The D-420 board is the larger of the two and as a
set, both boards provide audio for all channels. Located on this board are the stereo
pots, S1 dip switch, fuse, and stereo output connection. The stereo pots on the front of
the card are no longer used, with the exception of the very bottom one marked 6-track
subwoofer.
There is a dip switch marked S1, which is located on top of the board about 3” back
from the front. This switch controls both the subwoofer-out relay and (stereo) DTS-in
relay. Since the stereo format is no longer used, the proper setting of this switch is #1
off and #2 on. If the dip switch is not marked, on is away from the circuit board and off
is towards the circuit board. The fuse is for the 5V output on the stereo cable.
•
••
• D-420 PLAYBACK BOARD
See drawing D420. The D-421 and D-420 come as a set. The D-421 is the smaller of
the two and contains the logic control. Located on this board are the 6-track channel
SPL adjustment pots.