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Check Procedure References
Refer to the corresponding check procedure. Each check procedure is numbered the same as in
Figure 4-10 for quick reference.
Check 1, DC-DC Converter Output Voltage
1. Remove the cover referring to \Cover Removal" in Chapter 3.
2. Turn on the 4263B.
3. Using a multimeter, check to see if the voltages between the test pads and the ground
(TP500) on A1 Main Board Assembly shown in Figure 4-11 are in the ranges shown in
Table 4-1.
4. If passed, proceed to \Check 2, LCD Displays Anything?", otherwise proceed to \Check 9,
Fuse and Line Switch".
\+5 V"
500
\+12 V"
500
\ 12 V"
500
6
5.1
0.2 V
6
12
0.6 V
6
12
0.6 V
T roubleshooting
4-13
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