C
HAPTER
3. M
AINTENANCE
P
ROCEDURES
3-131
02.9631.0010
CONFIDENTIAL
15 Jan 98
Step 11.
Attach oscilloscope ground probe to upper enclosure. Make
sure that clip is attached to unpainted surface to ensure good
ground connection. Zinc screws and most unpainted surfaces
are good places to make ground connections.
CAUTION:
To prevent electrical shock, be careful to not touch
transformer capacitors when probing servo driver amplifiers.
Step 12.
Locate tilt transistor on top of low voltage supply (Figure 3-
48) and tilt trimpot on control interface board (Figure 3-49).
PAN TRANSISTOR
TILT TRANSISTOR
LOW VOLTAGE SUPPLY
Figure 3-48. Location of Tilt and Pan Transistor
PAN TILT
OLDER VERSIONS OF CONTROL
INTERFACE BOARD MAY HAVE
PAN/TILT ADJUSTMENTS HERE
PAN
TILT
Figure 3-49. Location of Pan and Tilt Trimpots
Notes:
•
When adjusting trimpots, do not allow head or yoke to drift into stops.
•
Some early versions of control interface boards have one-turn pan and tilt
trimpots located on daughterboard. These trimpots have less resolution
than 10-turn trimpots used on newer version of board. Adjusting these
trimpots requires more time and patience.