5-16 Chapter 5
Power Supply Troubleshooting
If the Green LEDs of the A8 Are Not All ON
Inspect the Motherboard
Inspect the A17 motherboard for solder bridges and shorted traces. In particular, inspect
the traces that carry the supplies whose LEDs faulted when A8TP4 (SDIS) was grounded
earlier.
Table 5-4 Recommended Order for Removal/Disconnection
Assembly to Remove Removal or Disconnection
Method
Other Assemblies that Receive Power
from the Removed Assembly
1. A3 Source Remove from Card Cage None
2. A7 Pulse Generator Remove from Card Cage None
3. A4 R Sampler Remove from Card Cage None
4. A5 A Sampler Remove from Card Cage None
5. A6 B Sampler Remove from Card Cage None
6. A9 CPU Disconnect W35 and W36 A20 Disk Drive
7. A2 Front Panel Interface Disconnect W17 A1 Front Panel Keyboard
8. A16 Rear Panel Interface Disconnect W27 A25 Test Set Interface
A24 Transfer Switch (8753ES only)
A23 LED Front Panel
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