MAIN CIRCUIT BOARDS
There are three circuit boards in the base of the
cabinet. One is the Microprocessor Board that
has the microprocessor, RAM, and other
digital integrated circuits. The other two
boards are mounted together as a unit. These
boards are the Power Board and the Printer
Interface Board.
Microprocessor board
This circuit board is held in place on four hex
standoffs with four 6-32 x 1/4" screws. When
replacing this circuit board, do be careful of
the wires that are run underneath the circuit
board. No not pinch these wires when putting
the new Microprocessor Board in place. The
four mounting screws should be tightened so
they are very snug, but do not overtighten.
Power Board/Printer Board Assembly
The Power Board is held in place to the
bottom of the cabinet via 6 screws into
standoffs in the base of the cabinet. Two of
these are at either end of the metal heatsink.
One of these screws (in the front right corner)
is threaded into a nylon hex spacer. Be very
careful not to overtighten the screw into this
nylon spacer.
The aluminum heatsink of the Power Board is
attached to the side of the machine via two
6/32 hex nuts.
The Printer Interface Board is held in place by
four 6-32 nuts. The board fits very snugly on
these special hex standoffs and care should be
taken when removing and installing the circuit
board. When tightening the four small nuts, be
careful not to damage nearby connectors or
foils of the circuit board.
CIRCUIT BOARDS BELOW PANEL
Under the transport panel, there are 2 circuit
boards: the Erase Board and the Sensor Board
Erase Board
The Erase Board has one RCA phono type
connector and two Amp connectors. This
board is held in place to two 10/32 screws
coming through the transport panel. These two
10/32 screws, like most screws in the pro-line
machine require a hex allen wrench.
Sensor board
The leader sensor circuits plus wiring for other
sensors/microswitches are located on this
board. The black sensor board is mounted to
the reinforcing rib underneath the transport
panel of the machine. All of the connectors
are keyed in some way and only fit based on
connector or wire length in one location. This
is true except for two small 4-pin red
connectors that go to the spindle motor tachs.
Note which connector is plugged into which
socket before unplugging these wires. Then
replace the connectors in the new circuit
boards as they were in the old one. Once
again, do not overtighten the 4 screws that
mount this board to the hex metal standoffs.
CIRCUIT BOARDS ABOVE PANEL
There are more circuit boards located on top of
the transport panel.
Tach wheel circuit board
The Tach Wheel circuit Board is mounted with
three screws to the top of the transport panel
(on later units). One of these screws is also
used to adjust the tilt of the tach wheel in order
to align it with the video tape path. Before
removing this board, notice that there are fixed
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