CITY THEATRICAL 1502 Follow Spot Yoke User Manual

CITY THEATRICAL 1502 Follow Spot Yoke

Getting Started with the City Theatrical Follow Spot Yoke for Source Four LED
Congratulations on the purchase of your City Theatrical Follow Spot Yoke for Source Four LED. The City Theatrical Follow Spot Yoke is a professional quality device that can provide smooth pan and tilt operation to your Source Four LED. A heavy steel yoke gives mass and prevents vibration, and ball bearings on the pan and tilt create extremely smooth movement, even on very long throws. The 1502 City Theatrical Follow Spot Yoke can be configured for use with the Source Four™ Series 1 and Series 2 LED fixtures as well as the ETC ColorSource Spot. All lenses from 5º to 50º can be used. A track allows the lighting fixture and any accessories to be perfectly balanced for ease of operation.

Mounting your Follow Spot Yoke Source Four LED
The City Theatrical Follow Spot for Source Four LED can be mounted in a variety of ways. The bottom of the pan bearing has female 1 ½” NPT pipe threads, and any length of 1 ½” pipe can be threaded into it. Using a 36” piece of 1 ½” pipe threaded into a 50 lb. boom base is a typical method.

The Follow Spot Yoke can be mounted in a variety of positions, such as:

• On a stand of 1 ½” pipe with a boom base
• Underhung from a pipe
• Overhung on a handrail

These diagrams illustrate three possible hanging methods:

Preparing Your Lighting Fixture

If you are planning to use a 14º-50º or a 10º Source Four, you will need to remove the shutters from the lighting fixture. This is not necessary, but may be desirable for a 5º Source Four to prevent the shutter blades from accidentally being moved during operation. Remove the shutters by removing the four machine screws which hold the two halves of the Source Four barrel together and exposing the shutter, pressure plate, and shutter spring parts. Remove the shutter blades, but reinstall the pressure plates and springs. Do not reinstall the existing four machine screws into the barrel. Go on the next step: Two Angle Brackets allow your Source Four to be installed in the Follow Spot Yoke Source Four LED. Replace the four ETC machine screws with the enclosed #8-32 x 1 ½” pan head Philips machine screws into the Source Four’s existing #8-32 hex nuts.
Next, install the two Tee Slot Extrusions using the enclosed #8-32 x 3/8” flat head Philips machine screws (three screws per extrusion) as shown in the illustration below.

Note: If you experience difficulty installing new #8-32 x 1 ½” screws it may be due to incompletely threaded holes on the Source Four barrel. Threads can be formed completely with the following steps:

1. Remove the bottom half of the barrel, and locate the threaded holes in the barrel.
2. With the top half of the barrel removed Screw the original ETC machine screws into the hole completely then remove. This will form the remaining threads.
3. Reassemble barrel and insert longer 1-1/2” machine screws into completely formed threaded holes.

Installing the Source Four into the Follow Spot Yoke
Note the two Tee Blocks that slide into the Tee Slot Extrusion. Using a 3/16” Allen key, slightly loosen the two 3/8” x ½” socket head shoulder screws to free the Tee Blocks. Carefully insert the Tee Slot Extrusions onto the Tee Blocks. Tighten the tilt handwheel. Temporarily tighten the shoulder screws

Install four 4-40 x 3/16” pan head machine screws, one in each end of each Tee Slot Extrusion. These screws serve as safety devices to prevent the Tee Blocks from accidentally slipping out of the Tee Slot Extrusion track.

Install the Lens Tube into the Source Four
Install the Lens Tube into the Source Four and install the two #10-32 screws (one plastic thumbscrew and one Philips machine screw) that hold the Lens Tube to the lighting fixture. Plug in the lighting fixture into a switch or dimmer and dress the cable to insure that it does not restrict the yoke’s movement or its balance. Turn on the lighting fixture and adjust the sharpness of the beam to the degree that you think is appropriate.
Balance the Lighting Fixture in the Yoke
The lighting fixture can be adjusted forward or backward in the Tee Slot Extrusion to establish a perfect balance point. To test the balance, carefully loosen the tilt locking knob and feel if the fixture is front heavy or back heavy. To adjust the balance, loosen the two shoulder screws and evenly push the fixture forward or backward in the Tee Slot Extrusion until it balances exactly. Lock the shoulder screws again. Test and repeat if necessary.

Using Other City Theatrical Accessories with Your Follow Spot Yoke
City Theatrical has created a range of accessories to make your Follow Spot more versatile and easier to operate.

handgrip.
1522| Follow Spot Handle for ETC Series 1 or 2 LED Ellipsoidal| Insert into rear of Source Four LED Series 1 or 2 to provide a handgrip.

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