Maintenance
Npaq® Hardware Manual
4.4. MXR Board Assembly
highlights the important components located on the MXR board assembly.
D A N G E R : Always disconnect the Mains power connection before opening the Npaq
chassis.
Figure 4-4:
MXR Board Assembly
Table 4-10:
MXR Board Jumper Selections
Jumper
Setting
Description
JP1
1-2
-5V power from external -12 V at J4-5
2-3
-5V power from external -5 V at J4-1
Table 4-11:
MXR Board Test Points (where “x” represents the channel number)
TP
Description
TP
Description
x00
2.5 V Reference Sine
5
Internal Use Only
x01
Sine after level shift
6
Internal Use Only
x02
2.5 V Reference Cosine
7
Internal Use Only
x03
Cosine
8
Internal Use Only
x04
A/D Select Sine
9
Internal Use Only
x05
A/D Clock Sine
10
Flash 1 Write Enable-N
X06
A/D Data Sine
11
Flash 1 Output Enable-N
x07
A/D Select Cosine
12
Flash 1 Chip Enable-N
x08
A/D Clock Cosine
13
Flash 2 Write Enable-N
x09
A/D Data Cosine
14
Flash 2 Output Enable-N
4
Digital Common
15
Flash 2 Chip Enable-N
4A
Analog Common
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Chapter 4
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