19
Subject to change without notice
5 After unscrewing the nuts “D”, accessible on the rear side
of the rear chassis, carefully remove the plastic screws “B”
and remove the white ceramic spacer discs (isolation and
heat sink).
6 Unsolder the 2 wires marked “A” on the bottom of the XY
board.
7 Replace the XY board and follow the previous instructions
in reverse order.
8 Connect power cable to the oscilloscope and switch it on.
9 Please follow the instructions of the Adjustment Procedure
HM303-6 in the following order (item):
1) RV1001: Adjustment of +146 Volt supply
2) +175 Volt check
3) RV1003: Adjustment of +12 Volt supply
4) -6 Volt accuracy check
10) P2007: YGain CH I at 5 mV/div
11) P2002: YGain CH II at 5 mV/div
25) P2012: ADDition balance
32) CV9001/9002, RV9006/9005: Y-Final Amplifi er
38) Y-Amplifi er Bandwidth Check
39) RV9001: Component-Tester Y-Offset
and
26) RV4005: Sawtooth start position
27) RV9004: X-Magnifi cation x1
31) RV9003: X-Magnifi cation x10
32) C9026, C9027: X-Magnifi cation x10 linearity
33) RV9002: X-Gain Adjustment in XY-Mode
TB Board
1 Before removing the TB board, check that the power cable
is not connected to the oscilloscope.
2 Remove the power rod from the power switch.
3 Press connectors marked “A” and pull the ribbon cables
(out).
4 Pull connector “B” (out).
5 Remove the 4 screws marked “C”.
6 Replace the TB board and follow the previous instructions
in reverse order.
7 Connect power cable to the oscilloscope and switch it on.
B o a r d R e p l a c e m e n t
4
5
1
2
