Philips PM3208 - 7.2 Removing and Remounting the Units

7 CORRECTIVE MAINTENANCE
7.2 REMOVING AND REMOUNTING THE UNITS
7.2.1
7.2.2
Removing the vertical PCB
~ Remove all connectors from the PCB.
Make sure that afterwards the connectors will be replaced correctly.
- Desolder the white twin-lead cable at the component side of the PCB.
- .Desolder the 2 brown wires and the 4 uninsulated wires to the input coupling switches
(fig..7.1).
~ Unscrew the 6 yellow-green wires at the soldering side of the PCB (fig. 7.1).
~. Unscrew the 2. knobs from the AMPL/DIV variable controls and those from the
AMPL/DIV switches by means of a hex screwdriver, size 1,5 mm, and remove them.
- Unscrew the 2 AMPL/DIV switches by means of a pick-lock, size 11 mm.
~ Unscrew the copper plate which is fixed at the frame (fig. 7.1).
- Loosen the 4 plastic supports (fig. 7.1) by means of a PCB snapper.
~ Now, the PCB can be removed.
- .Remounting the PCB can be carried out in reversed order.
Figure 7.1 Removing. vertical pcb
Removing the horizontal PCB
~ Remove all connectors from the PCB.
Make sure that afterwards the connectors will be replaced correctly.
~ Unscrew the yellow-green wire which is fixed at the frame (fig. 7.1).
~. Unsolder the brown wire from EXT-BNC connector to PCB.
~ Unsolder the red and brown wires from CRT socket to PCB.
~- Remove the 2 knobs from trigger coupling and trigger source by pulling them.
- Unscrew the knob from the MTB switch by means of a hex screwdriver, size 1,5 mm,
and remove it.
~ Unscrew the TIME/DIV switch by means of a pick-iock, size 11 mm:
- Remove tne screw which fixes the high voltage protection cover at the frame (fig. 7.1).
- .Remove the 4:screws which fix the PCB (fig. 7.2).
~ Now, the PCB can be removed.
~ Remounting the PCB can be carried out in reversed order.
7,2 REMOVING AND REMOUNTING THE UNITS