MOD 7a STEREO PROCESSOR
6
CONFIGURATION
The MOD 7a has a number of configuration options which are detailed in the following sections. Most of the configuration
options are selected throught the use of shunts (or jumpers) placed on header pins. Some of the options (such as those on
the matrix board) are selected through the use of DIP switches. If you need to move any shunts from the default factory
locations, it is probably easiest to do so before you have installed the MOD 7a. The main board must be removed to get to the
configuration shunts.
Preamp Jumper Settings
Rear Left Corner of Main Board
I
nstall both shunts for film projector.
(Factory setting)
Remove shunts for audio from video
source (DVD, LaserDisc, VCR).
I
nstall shunts on pins marked
PROJ 2
for film projector.
(Factory setting)
I
nstall shunts on pins marked
VIDEO
for audio from video source (DVD,
LaserDisc, VCR).
I
nstall shunts on pins marked
SOLAR
CELL
for film projector with standard
exciter lamp/solar cell soundhead.
I
nstall shunts on pins marked
REV
SCAN
for film projector with reverse
scan soundhead.
(Factory setting)
Install shunts on pins marked
REV
SCAN
(
PROJ 2
) for audio from video
source (DVD, LaserDisc, VCR).
(Factory setting)
Preamp Configuration
The MOD 7a preamps can be configured through the use of shunts placed on header pins. The drawing below shows the
shunt locations and the purpose of each shunt. The PROJECTOR 2 input can be configured for use with a film projector or
for use as an audio input from a video source such as a DVD, LaserDisk, or VCR. When used as an audio for video input,
the left and right channels are processed through the Circle Surround matrix for multi-channel sound. The shunts for
SOLAR CELL and REVERSE SCAN apply to Projector 1 and Projector 2 individually. Each projector input can be config-
ured differently.
Main Board Removal
To remove the main board, make sure that all connections are unplugged from the back. Then, using a small blade screw-
driver, gently remove the main board retainers at each end of the chassis, These retainers are just inside the front of the
chassis on each end.
Carefully
unplug the ribbon cables from the front panel circuit board. The main board can now be
removed by pulling it forward. It must be flexed upward slightly as it comes forward to clear the front panel board.
Reverse the procedure to re-install the main board. Be especially careful when re-plugging the ribbon cable to make sure
that the connectors are properly lined up with the header pins. It is easy to mis-align these connectors.
