Siemens Servo Screen 390 Service Manual page 22

3. Disassembly and assembly
2 3 4
3
N18
N15
N16
The two different versions of the
computer board are interchangable.
Refer to further information in the Spare
Parts List when replacing a PC 1662 with
a PC 1835.
22
N0
Siemens-Elema AB
Disassembling the
computer section
Computer board PC 1662/PC 1835 and
Adapter board PC 1663
The PC boards are connected to each other
in such a way that its not possible to remove
just one of them from the computer section.
Both PC boards must be removed at the
same time.
• Remove the software memory card.
• Separate the display section from the
computer section as previously described.
• Remove the eight spacer screws (1)
holding the connection ports to the rear
cover. Do not remove the screws holding
the power port (PWR).
• Disconnect the internal power cable
connector N18 from P18 on PC 1663.
• Disconnect the battery connector N0 from
P13/P14 on PC 1662/PC 1835.
Note – Computer setup information stored
in the CMOS-RAM, and for PC 1662 also
information stored in the SRAM, will be
erased when the battery is disconnected.
Factory default settings will be used next
time the Servo Screen 390 is turned on.
• Remove the two nuts (2) and washers (3).
• Remove the two screws (4) holding
PC 1662/PC 1835.
• Carefully lift the PC boards from the
computer section as much as needed to
make the ON/OFF switch connector N15
at P15 and the fan connector N16 at P16
1
on PC 1663 accessible.
• Disconnect the connectors mentioned
above.
• Lift off the PC boards.
• Carefully separate the computer board
from the adapter board.
Servo Screen 390
E382 E394E 061 01 02 02