This document covers the conversion of a Sentinel
Enlarger for operation on a different mains AC voltage.
Conversion from 110 volts to 220 volts, and from 220
volts to 110 volts, are very similar operations, and
both are covered here.
For such a voltage conversion, the following things
need to be changed. They are:
Sentinel AF Computer Box Power Transformer
Starlite Cooling Fan
Starlite Software EPROM
Position of Voltage Select Switch on Starlite
Motherboard
Lamps used in Starlite
This kit should include the parts listed below that
are checked off ( ):
AF Box Power Transformer (or) Sentinel AF Box Cover/Power Supply Starlite Cooling Fan (or) Starlite Filter Transport Starlite
Software EPROM Chip
Some instruction steps in the following sections are
preceded with a check box ()
to indicate the steps required for the particular configuration
of Conversion Kit that you have. Please follow the steps
that have a check mark in this box, and skip those that
do not.
SENTINEL AF COMPUTER BOX POWER TRANSFORMER
If you are only converting a Starlite Colorhead for
operation on a different mains voltage, please skip
this section and proceed to section #2, Starlite Cooling
Fan. That section and the ones that follow, all deal
with the Starlite Colorhead.
The Sentinel Autofocus Computer is housed in the black
box that rests directly behind the Starlite Colorhead.
The power supply for the computer is built onto the
interrior of the AF Box cover.
Remove the AF Computer Box from the Sentinel Chassis.
Unplug the main power cord to the Sentinel.
Unplug the AF Box power cord from the rear of the
Starlite Colorhead.
Unplug the short, flat interface cable from the left-hand
side of the AF Box.
Remove all four screws at the base of the AF Box.
Raise the Sentinel Neg stage as far as it will go.
Lift the AF Box from it's mount enough to gain access
to the connector cluster beneath it.
Remove the connector cluster plate from the bottom
of the AF Box.
Remove the AF Box from the Machine.
Remove the AF Box cover.
Remove all 7 of the small screws that hold the cover
onto the box enclosure. They are located around the
edge of the AF Box.
Carefully lift the cover from the Box Enclosure.
Unplug all cabling connecting the AF Box Cover to
the components in the Box enclosure.
The cover of the AF Box will now be free from the
Box enclosure.
If your kit includes a replacement
AF Box Power Transformer, perform the following
step. If your kit includes a new AF Box Cover, skip
this step, and proceed to #4, using the new cover.
A. Identify the type of Transformer that
your cover has on it. The transformer is the large
heavy component with Black and White, Orange and
Blue wires soldered to it. The drawings below show
the two types of AF Box Power transformers used
in Sentinel Enlargers.
If your transformer matches the drawing
on the left, above, then it can be re-wired for operation
on either 110 volts or 220 volts. If it matches the
one on the right, above, it will need to be replaced.
If there is a transformer in your kit, it will match
the one on the left.
Un-solder or cut the connections to the old transformer
primaries. These are the Black and White wires closest
to the bottom of the transformer.
Remove the three secondary wires from the terminal strip
on the Power Supply Circuit board. These are the orange
and blue wires soldered to the uppermost terminals of
the transformer, and which are fastened to the green
terminal strip on the Power Supply Circuit Board. Leave
these wires connected to the Transformer.
If your transformer needs replacement, as determined
above, unscrew it from the AF Box Cover. It is held
in by two screws and nuts. Install the new one in it's
place, in the same orientation.
B. Refer to the drawing below for the correct
wiring on the transformer primary contacts. The wiring
you use will depend on the mains voltage with which
you wish to use the Sentinel.
Extra wire and heat-shrink tubing are
provided for use in the re-wiring of the transformer.
When finished, double-check that the wiring is
correct and secure. Be sure to connect the transformer
secondary wires. These are the two orange, and one blue,
wires at the top of the transformer.
Install the new or modified AF Box cover.
On the new cover, locate the four cables to be plugged
in within the AF Box enclosure.
>The AF CPU Power Cable is the 6-Pin White connector
that plugs into the AF Computer circuit board.
>The Keypad Power Cord is the 3-Pin White connector
that plugs into the AF Box Junction Board at the bottom
of the AF Box.
>The Sentinel Network Cable (if installed) is the
smaller of the two flat cables on the AF Box Cover.
It plugs into the "SERIAL#2" connector on
the AF Box Junction Board.
>The Sentinel Ticket Printer Cable is the larger
of the two cables on the AF Box Lid. It plugs onto
the "PRINTER" connector on the AF Computer
Board.
Install these cables making sure that the connectors
are properly seated. Pay close attention to the flat,
grey cables, since it is very easy to get the connectors
one pin off-position.
Before re-installing the AF Box onto the Sentinel,
test it as follows:
Take the Sentinel Junction box connector, which is
plugged in at the rear, left corner of the Sentinel's
Negative Stage, and plug it into the mating connector
at the bottom of the AF Box. It will only fit into
one of these connectors. Make sure that the keypad
is still plugged into the junction box. This will
allow the AF Box to be operated without the Sentinel
Enlarger chassis.
Plug the AF Box into Mains voltage. This may require
modification of the power plug, which will have to
be done before operation.
When the AF Box is plugged in, the keypad should "beep,"
followed by a message with "ZBE Sentinel Enlarger."
If this does not happen, re-open the box and check
your connections.
Once the AF Box is checked out and functioning,
re-install it onto the Sentinel Chassis.
STARLITE COOLING FAN
If your conversion kit includes an entire new Filter
Transport for the Starlite 55 Colorhead, merely remove
the old one, and replace it with the one included in
the kit. In this case, skip this section, and proceed
to section #3, "Starlite Software EPROM."
If a new Cooling Fan is supplied, and the kit includes
no new transport assembly, the fan on your existing
Filter Transport will need to be replaced. Please follow
the procedure below for the replacement of this fan.
The Starlite utilizes a single fan for the purpose
off cooling it's lamps. This fan is either a 110 volt
or 220 volt part. The fan must be replaced with one
of the correct voltage. The replacement of the Starlite
cooling fan requires disassembly of the Filter Transport
module, also referred to as the Starlite's "Light
Engine."
Remove the Filter Transport from the Starlite Colorhead.
Remove the lamp compartment cover by loosening and
removing the three brass thumbscrews that hold it
on.
Disconnect the Filter Motor Assembly plug from the
Filter Transport Junction Board. The Drawing below
shows the location of this plug.
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