Removing The Mode Pcb - Philips PM3208 Service Manual

20 mhz dual channel oscilloscope
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7.2.4
7.2.5
7 CORRECTIVE
MAINTENANCE
Removing the mode PCB
~
Remove all connectors from the PCB.
Make
sure that afterwards
the connectors
will be replaced
correctly.
-
Remove the 4 screws from the plastic rim around the front (fig. 7.3) and remove the
rim.
~
Remove the knobs X POS, POS A and POS B, by pulling them firmly.
Remove the 3 position potmeters by means. of a pick-lock, size 11 mm.
~
Remove the 5 screws from the PCB (fig. 7.4).
Now, the PCB can be removed.
~
Remounting the PCB can be carried out in reversed order.
Figure
7.4 Removing
mode
pcb
Removing the CRT
~
Remove the PCB from the CRT connector.
-
Unscrew the yellow-green wire from the frame (fig. 7.3).
-
Remove the 2-pole connector of the trace rotation coil (brown and red-wires) from the
CAL and CONTROL PCB.
~
Remove the 2 screws from the clamp around the CRT (fig. 7.3).
-
Remove the 2 screws by which the CRT clamp is fixed at the frame and remove the 2
parts of the clamp (fig. 7.3).
-
Now, the CRT can be removed by gently pulling it from the front.
~
Remounting the CRT can be carried out in reversed order.
7.2 REMOVING AND REMOUNTING
THE UNITS

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