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E331.E2501.061.21.XX.02
System SIRECUST 1280/1281
Bedside Monitor - Service Manual
+15V Measuring point
(Upper pin)
Frontside
Red
68000
+5V Measuring point
Figure 7-1.
+5 V, and +15 V, Voltage Test Points on Display Processor Board
7.1.2.
+15 Voc Supply Voltage
1.
Connect
the
digital
voltmeter
(DVM) to the upper leg of C4 on
the
Display
Processor
Board.
Refer to Figure 7-1.
2.
Adjust R14 on the Power Supply
Board to +15.5 +0.1 Voc:
3.
Secure R14 with Torque-Seal® or
an
equivalent
substance
to
prevent
any
change
in
the
resistance
setting
of
the
potentiometer.
7.2.
High Voltage
WARNING:
The
high-voltage
circuitry
retains
lethal voltage
for. approximately
30 seconds
after the monitor has been
switched OFF
1.
Switch the monitor power OFF.
2.
Connect
the
ground
lead
of a
high-voltage probe to the monitor
chassis.
Table 7-2.
Display Subsection Boards
3.
Using the probe, connect the DVM
to the anode of the CRT.
4.
Verify that the connection on the
CRT anode is secure.
5.
Switch monitor power ON.
6.
After one minute, adjust R63 on
the Z-Amp
Board
to produce
a
high-voltage
reading
of
+15 KV
+100 V.
7.
Switch
monitor
power
OFF
and
disconnect
the
probe
from
the
monitor.
7.3.
Display Alignment
NOTE: SwitchmonitopowerON and
allowmonitoto remairONfor onehour
beforeperforminthisprocedure.
Specific potentiometers referenced in the
following procedures may not be used on
all monitors.
Refer
to Table
7-3 for a
cross-reference
of potentiometers
used
on particular boards.
CURVE
DEFLECTION
BOARD
BOARD
1281
A270
A310
87 91 667 E2500
87 91 873 E2500
1280
A130
A160
87 91 402 E2500
87 91 436 E2500
POWER
SUPPLY
BOARD
Z-AMP
BOARD
A261
A280
87 91 865 E2500
87 91 675 E2500
A181
A140
87 91 857 E2500
87 91 410 E2500
Page 7 - 2
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