Troubleshooting
2-15
2.10 Documentation
The following information is provided to support the
troubleshooting tests and procedures previously cov-
ered in this section of the manual. Figure 2-1 provides
an overall block diagram of the Model 2001 showing
the major circuit groups. Most circuits in the Model
2001 are tested and/or exercised by Built-in Test. A
short description for each of these tests explains how
Table 2-9
Power supply checks
Step Item/component Required condition Remarks
1 F100 line fuse Check continuity Remove to check
2 Line power Plugged into live receptacle,
power on
Check for correct power up
sequence
3 U108, pin 3 +5V, ±5% Reference to Common 3
4 U107, pin 3 +15V, ±0.75V Reference to COM
5 U102, pin 3 -15V, ±0.75V Reference to COM
6 CR109, +BS +34V to +38V Reference to Common 3
7 CR110, -BS -34V to -38V Reference to Common 3
8 U103, pin 3 ~+18V Reference to Isolated Common
9 U103, pin 2 +8V Reference to Isolated Common
10 U619, +5VC +5V, ±5% Reference to Digital Common
11 U629, pin 3` +5V, ±5% Reference to Digital Common
that particular circuit operates. The display board and
the power supply are not tested by Built-in Test. Thus,
some basic theory is provided for these circuits in para-
graphs 2.10.1 and 2.10.2.
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