Flat
blade screwdriver, 1/4" blade
Flat
blade screwdriver, 1/8" blade
Wire
Cutters
Long
nose pliers
Soldering iron and
solder
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IMPORTANT NOTICE
|
| This procedure
requires removing the headbar gearbox from the deck chassis.
In doing so, the tape head adjustments will be compromised.
Upon re-installation of the gearbox, the proper steps must
be taken to ensure correct head alignment. |
|
On
the resistor, cut both leads to about 1/4 inch. On the diode,
cut the cathode lead (identified by the white stripe on
the black body of the diode) to about 3/4 inch. Cut the
anode lead to about 1/4 inch.
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|
|
Using the long
nose pliers, place a hook on the end of the cathode lead
of the diode. Do the same with either end of the resistor.
Hook the two ends of the diode and resistor together, and
clamp the two hooks closed. Then solder the leads together.
|
|
Removing
the old motor. Locate the gearbox on the underside of the
Phi deck. With a 1/4" flat blade screwdriver, remove three
screws on the side of the deck chassis which fasten the gearbox
in the chassis. The gearbox will slide out the bottom of the deck
chassis.
With wire
cutters, cut the green and black wires from the existing motor
terminals. Cut as closely to the terminal as possible, to ensure
that there will be enough remaining wire to make the connection
to the new motor.
Orient
the gearbox so that the starwheel is up. Looking down into the
gearbox where the motor is attached, you will se two small holes
for access to the motor mount screws. Using a 1/8" flat blade
screwdriver through the holes in the gearbox, remove the two screws
which fasten the motor to the gearbox. The motor will slip off
the gearbox.
Using
a screwdriver, gently pry the small gear from the shaft of the
old motor. Discard the old motor. Reinstall the gear onto the
shaft of the new motor with the gear teeth closet to the motor
body.
| Strip
1/4" insulation from both wires and tin them with solder.
Using the long-nose pliers, place a hook in the tinned end
of each wire. Hook the tinned portion of the green wire around
the junction of the resistor and the diode. Clamp the wire
down with the pliers and solder the wire to the resistor and
diode leads. |
|
| Slide
the plastic tubing over the circuit from the anode end of
the diode. Position the wire so that the tubing can slide
over both the wire and the resistor, with the wire protruding
from the tubing at the same end at the resistor lead. Slide
the tubing far enough over the components to ensure that both
the resistor and diode bodies are completely covered. NOTE:
If the tubing is of the kind that shrinks when heat applied,
shrink the tubing over the components, ensuring that the tubing
completely covers both components. |
|
| Identifying
the connections on the 4700-039 (new) motor. The polarity
of the connections for the new motor is identified by viewing
the motor from the back side (terminal side). Locate the ink
dot on the chassis and position the motor so that the ink
dot is below the center hub. The terminal on the left is positive
(+) and the terminal on the right is negative (-) (see illustration). |
|
|
Attaching the
protection circuit. Connect the free resistor lead to the
positive (+) terminal of the motor, positioning the resistor
so that it extends upward from the motor. Wrap the end of
the resistor lead around the terminal and solder it to the
terminal..(NOTE: The motor terminals have holes for connection,
but the resistor and diode leads are too large to fit in
the holes.)
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 |
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Bend the free
end (anode) of the diode down and attach it to the negative
(-) terminal of the motor (see illustration at right). Clamp
and solder the connection as before. At this same connection
point, clamp the tinned portion of the black lead to the
terminal, and solder it.
The new motor
is now prepared for installation into the deck.
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| Installing
the new motor. Insert the shaft of the new motor into
the gearbox. Orient the motor so that the resistor/diode network
is nearest the top left corner of the gearbox (see illustration
at right). Attach the new motor to the gearbox using the same
screws that held the old motor. DO NOT TIGHTEN the screws
yet. |
|
Looking
through the side of the gearbox, ensure that the teeth on the
motor gear are aligned exactly with the teeth of the first gear.
Use a screwdriver to gently move the motor gear up or down the
shaft to align with the first gear.
As you
tighten the screws on the motor, ensure that the gears mesh well
without binding. This can be tested by rotating the starwheel
in both directions to see if the gears move smoothly. NOTE: With
the protection circuit installed, the starwheel will rotate freely
in one direction, but will be more difficult in the opposite direction.
Reinstalling
the gearbox. Carefully reinstall the gearbox in the chassis in
a manner reversing the removal, using three screws to attach the
gearbox to the chassis.
Perform
the headbar adjustments in accordance with head alignment procedures.
The installation
is now complete.
Also see
LMS
102A Online Troubleshooting Guide
Reel
Motor Replacement
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