1998-08-0320 MAC 500
4.6 G
OBOS
4.6.1 F
IXED
-
GOBO
WHEEL
STARTS
ROTATING
SPONTANEOUSLY
• Improper adjustment: This can occur when the fixture reaches operating temperature if there is too much distance between
the wheel’s magnet and the sensor IC. When the wheel is properly aligned and in the open position, the sensor must be paral-
lel to the magnet and directly over it at a distance of no more than 1.5 mm. Make sure the wheel is properly aligned before
attempting to adjust the sensor position. Refer to procedure 3.3.
4.6.2 G
OBO
WHEEL
TIME
OUT
(
FgER
,
RgER
)
• Improper optical alignment: The sensor may not be able to detect the indexing magnet if the wheel is out of alignment.
Refer to the gobo wheel adjustment procedures.
• Improper sensor alignment: If the fixed-gobo wheel fails to reset when properly aligned, or if the rotating-gobo indexing
fails, the sensor IC may be too far from the indexing magnet. The maximum distance between the sensor and the magnet is
1.5 mm.
4.6.3
ROUGH
OR
NOISY
GOBO
SELECTION
• Belt too tight: Adjust tension by removing the rotating-gobo wheel from the shaft adaptor (see Figure 2-2) and adjusting the
4 motor-mounting screws to tilt the motor shaft closer to, or further away from, the silicone drive gear.
• Loose wheel: A noisy wheel probably indicates that the rivets or screws connecting the wheel to the shaft adaptor are loose.
On the fixed-gobo wheel, replace the rivets (3.2 x 8 mm, P/N 376478). For extra strength, the wheel may be glued to the shaft
adaptor with red, high-temperature silicone adhesive.
4.6.4 R
OUGH
GOBO
ROTATION
• Gobo bearings not seated correctly: If the bearing is not pressed all the way into its holder (the black plastic part that
screws to the wheel), the gobo holder rubs against the bearing holder, increasing friction and making noise or causing jerky
rotation. The problem is fixed by pressing on the gobo holder from the lamp side until the bearing snaps into the proper posi-
tion. The proper clearance between the gobo holder and the bearing holder is approximately 0.5 mm.
• Worn, dirty, or dry bearing: Clean and lubricate the bearing with silicone lubricant. See procedure 2.5.8. Replace the bear-
ing if necessary.
4.6.5 G
OBOS
SLIP
IN
HOLDER
• Gobo and/or retaining spring not seated correctly: The gobo and spring must be squarely seated flush against the gobo
holder. Use a small flat-tip screwdriver to position the gobo and spring. For extra security, the gobo may be glued in place
with 3 drops of red, high-temperature silicone adhesive.
4.7 I
RIS
,
FOCUS
,
AND
PRISM
4.7.1 N
OISY
IRIS
• Iris noise at fast speed is can be caused by vibrations from the drive motor. Operating the iris at slower speeds reduces the
noise. Replacing the iris is the only other solution. We are investigating ways to reduce iris noise.
4.7.2 V
ISIBLE
IRIS
GRAPHITE
• Excess graphite powder can accumulate at the edge of the iris blades and become visible in the projected image. This excess
may be removed by blowing it away. Be careful though not to get the powder on lenses and other optical parts.
4.7.3 R
OUGH
FOCUS
• Improper belt tension. If the focus drive belt is too tight or too loose, focus action will be choppy or difficult. Refer to
“Install focus module” on page 9.
• Focus slides need lubrication. Refer to section 2.8.2.
4.8 S
HUTTER
/
DIMMER
4.8.1 R
ANDOM
SHUTTER
ACTION
• A bug in versions 1.3 and before causes the DMX signal on a random channel to be misinterpreted for a fraction of a second,
after which normal control returns. This is only seen with certain controllers, for example the Strand 520, and can affect any
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