Dräger Narkomed 2C - Troubleshooting; Power Supply and Voltage Distribution

NM2C TROUBLESHOOTING GUIDE
3.0 TROUBLESHOOTING
This section contains information to assist the North American Dräger qualified
Technical Service Representative (TSR) in locating electrical faults affecting the
NARKOMED 2C monitoring and display devices. Since most troubleshooting efforts
begin with verifying power supply voltages, the following paragraph outlines the
voltage distribution scheme within the machine along with test points for each of the
voltages.
3.1 Power Supply and Voltage Distribution
In the NARKOMED 2C, +5VDC, +12VDC and -12VDC are supplied to J15 on
the processor board; +8VDC is supplied to J4 on the alarm channel and is also
distributed to the ventilator controller via J3 on the alarm channel. These
voltages can be measured at the connectors shown in Figure 3-1. Table 3-1 lists
the acceptable range for each voltage under normal load conditions. Figure 3-2
shows a block diagram of the NARKOMED 2C, including the primary and
secondary voltage distribution scheme.
TABLE 3-1: TEST POINTS AND ALLOWABLE RANGES
PROCESSOR VOLTAGE ACCEPTABLE RANGE
J15-14 (Pur) + 5 VDC 4.85 to 5.15 VDC
J15-4 (Yel) +12VDC 11.76 to 12.24 VDC
J15-13 (Orn) -12VDC -11.64 to -12.36 VDC
J15-15 (Blk) Common
ALARM CHANNEL VOLTAGE ACCEPTABLE RANGE
J3-9 (Wht) + 8 VDC 7.76 to 8.24
J3-3 (Orn) Common
SV50556
987
654
321
123
456
13 14 15
987
121110
PROCESSOR BOARD
CONNECTOR J15
(TOP VIEW OF CONNECTOR
AS SEEN FROM FRONT
OF MACHINE)
ALARM
CHANNEL
CONNECTOR J3
Figure 3-1: POWER SUPPLY TEST POINTS (REAR VIEW OF CONNECTORS)
Rev. U
3-1
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