Specifications

52 Chapter 3
Troubleshooting
Self-Test Diagnostics (Step 1)
If the Test Set Fails to Power-up
1. Is the Test Set plugged in? Listen for fan operation. If you don’t hear
it, check the line fuse (Figure 3-3) and the GFI reset button, see
“Reset and GFI-Test Buttons (older units with GFI circuit)” on page
98.
Figure 3-3 Fuse
2. If there is no image on the display, remove the Test Set’s covers and
check the power supply LEDs: +5V,
−12V, +12V (see Figure 3-4). If
one is out, the power supply or regulator board is faulty. If no LEDs
are lit, confirm that the Test Set is connected to the main power
source. (Also, see step 5.)
Spare Fuse
(A3F1)
Line Fuse
(A3F1)
fuse1.eps