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4.
Loosen the clamp at the base of the vidicon.
Pull the socket off the base of the vidicon.
5.
Push the vidicon out through the front of the
camera.
6.
Inspect the replacement vidicon for scratches
on the faceplate.
Clean the faceplate care-
fully with lens tissue or a clean lint-free cloth.
7.
Insert the replacement vidicon into the front of
the camera.
Slide it back as far as it will go.
8.
Rotate the vidicon until the base index (the
short pin between pins 1 and 8 is at the 3
o'clock position is viewed from the rear.
9.
Tighten the clamp on the neck of the vidicon.
10.
Replace the lens mounting ring and the lens.
11.
Proceed to 3-4.
VIDICON ADJUSTMENTS.
3-4.
VIDICON ADJUSTMENTS
Steps 1 and 4 should be checked whenever a new
vidicon has been installed.
In addition, the tar-
get-voltage
adjustment should be performed when
installing a new vidicon or whenever camera per-
formance is tested.
See Section 3-6.
VIDEO
ADJUSTMENTS.
1.
Heater Voltage.
Disregard this step if the
replacement Vidicon is of the same type as
the original.
If the new vidicon has a differ-
ent type number,
a wiring change in the heater
will be required.
Two vidicon types may be
used.
The following table lists the vidicons
and the heater requirements.
Type
Heater Voltage
Heater Leads
M3016
12.0V
Blu - Brn
7262A
6.3V
Gry - Blu
GRAY
WHT-BLUE
(TO"D' BOARD)
TO 9~PIN
(TO'P'BOARD)
CONNECTOR
WHT
- GRN (TO BEAM CONTROL )
HEATER LEADS ARE BLUE AND
BROWN FOR M3Z0OI6 VIDICONS
Fig. 3-2.
VIDICON SOCKET
CONNECTIONS.
2.
Socket Connections.
Check the wiring at the
vidicon socket.
For 6.3 volts the wires at
pins ] and 8 should be gray and blue.
For 12. 0 volts, the leads at pins 1 and
3-2
8 should be blue and brown.
These leads
originate at the power transformer.
3.
Deflection Checks.
This step may be dis-
regarded if the deflection circuits of the
camera
are known to be operating properly.
If the condition of the deflection circuits is
unknown,
check the deflection waveforms,
as shown in Fig. 3-3 before the vidicon
socket is pushed onto the base of the vidi-~
con.
If normal waveforms
are observed,
turn off the camera and push the socket
onto the base of the vidicon.
VERTICAL
OUTPUT,
3v(p-p)
7262A
HORIZONTAL
OUTPUT, 35v(p-p),
15,750 Hz
Fig. 3-3.
DEFLECTION
CHECKS.
4.
Beam Centering.
The vidicon employs a PM
beam-centering magnet mounted forward of
the vidicon clamp.
This magnet functions in
the same
way as the PM centering devices
used in most black-and-white TV receivers.
To check beam centering,
rotate electrical
focus and watch the monitor.
The picture
should appear to rotate about the center of
the screen.
If the picture center shifts to
the side or up or down,
as focus is turned,
the beam-centering magnets should be ad-
justed.
Spread the tabs and rotate the en-
tire assembly until the point around -which
it appears to rotate remains
in center
screen.
3-5.
OPTICAL FOCUS
a.
Turn on the camera
and point it at a distant
object (farther than 50 ft. away).
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