18
Subject to change without notice
6 Locate TB board, press connectors “A” and “B” and pull the
ribbon cables (out).
7 Unsolder the resistors at the BNC sockets “A”, “B” and “C”
and bend their leads away from the sockets.
8 Unsolder the 3 steel plate angles marked “D”, “E” and “F”
where soldered on the YP board.
9 Remove the nuts “A” and “B”.
10 Remove the screws “C” and “D”.
Attention!
Do not unscrew the 2 screws marked “X” in fi g. 4!
– Lift the YP board at the rear so that the screws (where the
nuts “A” and “B” were mounted before) do not obstruct the
YP board removal.
– Replace the YP board and follow the previous instructions
in reverse order.
– Connect power cable to the oscilloscope and switch it on.
– Please follow the instructions of the Adjustment Procedure
HM303-6 and make a complete adjustment from item 1 to
item 42.
XY Board
1 Before removing the XY board, check that the power cable
is not connected to the oscilloscope.
2 Remove the power rod from the power switch.
3 Locate and identify TB board, press connectors “A” and pull
the ribbon cables (out).
4 Press connectors “A” and pull the ribbon cables (out).
3
4
B o a r d R e p l a c e m e n t
1
2
3
