Siemens SIRECUST 1280 Service Manual page 116

E331.E2501.061.21.02.02
System SIRECUST 1280/1281 Bedside Monitor - Service Manual
Table 6-3. Signal Summary (Continued)
A
SIGNAL TEST POINT BOARD OF ORIGIN
+15V EXTA X16 pin 21 (ref. to pin 24): rear panel Front End
+15V EXTB X17 pin 21 (ref. to pin 24): rear panel Front End
25K1 X16 pin 17 (ref. to pin 18): rear panel Front End
25K2 X17 pin 17 (ref. to pin 18): rear panel Front End
DCS A12 X3 pin 9 (ref. to pín 10): Front End board SIREM
DCS B12 X3 pin 11 (ref. to pin 12): Front End board SIREM
DCS C12 X4 pin 9 (ref. to pin 10): Front End board SIREM
DCS D12 X4 pin 11 (ref. to pin 12): Front End board SIREM
In addition, also consider the following
information in Sections 6.4.1 and 6.4.2:
6.4.1. Display Subsection Boards
If the troubleshooting procedures of
Section 6.7 indicate a faulty Deflection
Board, Z-Amp Board, or Power Supply
Board, always verify that the Curve Board
output signals are functioning properly
(see Section 6.8) before connecting the
Curve Board to a new replacement
board(s). A defective Curve Board can
damage other display subsection boards.
6.4.2. Signal Processing and Control
Boards
If the troubleshooting procedures of
Section 6.7 indicate a faulty signal
processing and control board, check the
VME connectors on the board for bent
pins and proper configuration of jumpers,
prior to PC board replacement. Refer to
Appendix C for jumper configurations.
6.5. Signal Summary
Table 6-3 lists the test points and signals
used for troubleshooting a 1280 or 1281.
This signal summary is intended for quick
reference purposes only. The trouble-
shooting procedures described in Section
6.7 should be used as the primary source
of information for troubleshooting a
problem within a 1280 or 1281.
WARNING: | Hazardous voltages are
present while probing signals listed in
Table 6-3. Always turn power OFF
whenever connecting/disconnecting PC
boards and cables, checking and
replacing fuses, or connecting and dis-
connecting equipment probes to or from
test points.
The high-voltage circuitry retains lethal voltage
for approximately 30 seconds after the monitor
has been switched OFF
6.6. Troubleshooting Flowchart
The troubleshooting flow chart in Figure
6-1 on pages 7a thru 7e, illustrates a
process for isolating defective PC boards
or subassemblies. The chart is intended
as a quick reference only.
The troubleshooting procedures outlined
in Section 6.7 should be used as the
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