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E331.E2501.061.21.02.02
System SIRECUST 1280/1281
Bedside Monitor - Service Manual
* Yes:
* No:
Check
Continue.
Curve/Deflection
Boards harness for continuity
between X8 on Curve Board
and X1/X2 on Z-Amp Board.
Refer to Appendix B, Figure
B-1.1
or
B-1.2,
(monitor
wiring
diagrams).
Replace
harness if bad.
If unable to correct problem,
replace Curve Board.
Proceed
to
Functional
Verification, Chapter 5.
20.
Turn
power
OFF,
and
disconnect
21.
X3 from Power Supply Board.
Turn
power
ON
and
measure
supply
voltages
at
X3-3,
X3-7,
X3-8, and X3-9. Refer to Table 6-3.
Are supply voltages okay?
Yes:
Continue.
No:
Replace
the
Power
Supply
Board
and
proceed
to
Functional
Verification,
Chapter 5.
Turn
power
OFF,
and
check
Power Supply cable assembly for
continuity between
X3 at Power
Supply
Board
and X4 at Z-Amp
Board.
Check
Curve/Deflection
Boards
harness for continuity between X8
on
Curve
Board
and
X1/X2
on
Z-Amp Board, and between X7 on
Curve Board and X2 on Deflection
Board.
Refer
to
Appendix
B,
Figure
B-1.1
or
B-1.2,
(monitor
wiring diagrams).
Are
cable
harnesses
assemblies
okay?
6.7B.
6.7C.
* Yes:
Replace Z-Amp
Board.
If.
problem
is not corrected,
replace CRT.
Proceed
to
Functional
Verification, Chapter 5.
No:
Replace
bad
harness
and
proceed
to
Functional
Verification, Chapter 5.
Monitor Powers Up Properly
Sometimes and Sometimes
Does Not
Turn power OFF. Disconnect X1,
X2, and X3 loads from the Power
Supply Board.
Adjust
R3
(+5V
adjustment
potentiometer) for 5.20 + 0.01V at
X1-2 (chassis = GND).
Adjust
R14
(+15V
adjustment
potentiometer) for 15.80 + 0.03V
at X2-4.
Turn
power
OFF.
Reconnect
X1,
X2, and X3. Turn power ON and
OFF several times. Wait for piezo
sound to stop each time power is
turned OFF.
Does
monitor
power
up
each
time?
Yes:
Adjust
+5V
and
+15V
supplies.
See
Chapter
7,
Section 7.1., and proceed
to
Functional
Verification,
Chapter 5.
* No:
Replace
Power
Supply
Board and go to Function-
al Verification, Chapter 5.
Monitor Omits Start-Up Self
Tests
Adjust
+5V and
+15V
supplies.
Refer to Chapter 7, Section 7.1.
Page 6 - 12
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