5.4 TROUBLESHOOTING
The troubleshooting information, along with appropriate schematics and parts lists, are
included to serve as a guide to enable equipment repair. The schematics and parts
lists may vary slightly from actual production units and are to be used as a guide only.
Likewise, the troubleshooting section is a guide only and cannot cover all possible con-
tingencies that may occur.
Each Model 865 and 866 is covered by a 12-month warranty as described on the
inside front cover of this manual. Warranty will be void if the unit shows evidence of
having been tampered with.
1. Set up the equipment as shown in Figure 5-1.
2. Turn on the instrument.
3. Perform calibration. refer to Table 5-2 or Table 5-3, as applicable.
4. Verify correct calibration. Refer to paragraph 5.1, performance
accuracy check.
5. Reinstall the bottom cover.
Step
Range
Input
Adjustment Reading
A
200°F
19220 ohms
R111
00.0
6
0 counts
B
200°F
220.8 ohms
R110
190.0
6
¹
/
₂
0
counts
C
300°F
43 ohms
R112
300
6
0 counts
D
R110 and R112 are interactive. Repeat steps B and C until the results are
repeatable.
11
TABLE 5-2
MODEL 865 CALIBRATION
Step
Range
Input
Adjustment Reading
A
150°C
7355 ohms
R111
00.0
6
0 counts
B
150°C
152.8 ohms
R110
100.0
6
¹
/
₂
0
counts
C
150°C
41.9 ohms
R112
150
6
0 counts
D
R110 and R112 are interactive. Repeat steps B and C until the results are
repeatable.
TABLE 5-3
MODEL 866 CALIBRATION
Summary of Contents for 865
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