MTR221/A - MTR221/A DHHS
MANUALE ISTRUZIONI / INSTRUCTION MANUAL
Modello/Model R221/A - R221/A DHHS
A
DJUSTMENTS
33
R22
1/A
- R221
/A DHHS -
Ad
justment
s
Ralco
srl
• Before replacing the knobs, close both shutters and mount/fix the knobs so that the field
index is set at “0” (completely closed), see paragraph
Shutter Dial Adjustment
in this
Chapter.
M
ECHANICAL
M
OTION
S
TOP
A
DJUSTMENT
The purpose of these stops is to prevent stressing the control shafts of the shutters at the two
limits of travel. This is done by limiting rotation of the control shafts.
• Adjustment of these stops will not be required unless:
• The shutters can not be completely closed or opened to the largest size.
• Torsion is felt at one or both ends of the travel.
• The shutters themselves appear to limit the motion rather than the stops.
Adjustment of Stops
CLOSED Stop Long and Cross
Shutters
The stop is effected by a cam
• Loosen the Allen screw placed on
the side of the stop. See
Fig.
Closed Stop
• Use the knob to close the shutters.
Take care not to apply excessive
force to check that the shutters
touch.
• Use the field light to check that
shutters are closed.
• Rotate the cam stop to a stand still.
• Tighten the Allen screw.
• Open and close the shutters sev-
eral times to check that they close/
open fully and that, when they close, the cam touches the stop.
OPEN Stop - Long Shutters
• Remove the collimator covers, see Chapter -
C
OVER
R
EMOVAL
.
• Remove the two lateral, leaded panels.
• Loosen the two screws on the right side of the collimator, see
Fig. Long Shutters
.
• Activate the light field and open the shutters to 43 cm (17”) projection at 100 cm.
• Tighten the two screws until they touch the shutter support levers.
• Open and close the shutters several times and make sure that both levers touch the
screws.
• Tighten the fixing nut on the screw.
OPEN Stop - Cross Shutters
• Remove the collimator covers, see Chapter -
C
OVER
R
EMOVAL
.
• Remove the two lateral, leaded panels.
• Tighten the screw on the left side of the collimator, see
Fig.
Cross Shutters
.
• Activate the light field and open the shutters to 43 cm (17”)projection at 100 cm.
• Loosen the screw until the head touches the shutter support lever.
• Open and close the shutters several times and make sure that both levers touch the
screws.
• Tighten the fixing nut on the screw.
Fig. Closed Stop
Summary of Contents for MTR 221/A
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