Replacing important components
6 - 7
Siemens AG
SPR8-125.061.02
Page 7 of 8
POLYMOBIL Plus
Medical Engineering
Rev. 01
01.00
TD SD 24
•
Switch the unit off; disconnect the line voltage plug;
•
Remove the 2 cover screws on each side (1/Fig.10) and remove the cover(with cassette
drawer).
•
Measure the actual voltage present in the capacitor bank with the DVM at test point -
VCC and +VCC on the inverter board D960 or (more accessible) on the capacitor board
D970 at the + connecting point of the C3 capacitor and on the right-hand side of fuse F3
(see Fig. 11).
•
Remove one cover screw on each side (2/Fig.10).
•
Unscrew the three Allen screws (2/Fig.11).
•
Pull out the connectors X3 and X9 (3/Fig.11) on the charging board D950.
•
Remove flat ribbon cable X20 (4/Fig.11) from the inverter board D960 and from the
charging board D950.
•
Disconnect and remove the cables of oscillating circuit capacitor C1 and oscillating
circuit coil L1 to inverter board D960.
•
Pull the entire capacitor unit out towards the front.
Continue work only if the capacitor unit is discharged (U
<
10 V)
If a fuse on D970 is defective, high voltage may still be present at
the affected capacitor.
In this case, discharge the affected capacitor with the discharging
resistor R5 (5/Fig. 11) .
VCC
+ -
R5
C1
R3
R4
1
1
2
2
Fig. 10
Fig. 11
WARNING
WARNING