HP 8753E - Page 11

Step 3. HP-IB Systems Check
.................. 4-6
If Using a Plotter or Printer
................. 4-7
IfUsinganExternaiDiskDrive.
............... 4-7
Troubleshooting Systems with Multiple Peripherals
.......
48
Troubleshooting Systems with Controllers
...........
4-8
Step 4. Faulty Group Isolation
................. 4-9
Power Supply
.........................
4-10
Check the Rear Panel LEDs
..................
4-10
Check the A8 Post Regulator LEDs
.............. 4-10
Digital Control
.........................
4-11
Observe the Power Up Sequence
...............
4-11
Verify IntemaI Tests Passed
..................
4-12
Source
............................
4-13
Phase Lock Error Messages
..................
413
Check Source Output Power
.................
4-13
No Oscilloscope or Power Meter? Try the ABUS
........ 4-15
Receiver
...........................
4-16
ObservetheAandBInputTraces
..............
4-16
Receiver Error Messages
...................
4-17
Faulty Data
.........................
4-17
Accessories
..........................
4-18
Accessories Error Messages
..................
4-18
5. Power Supply Troubleshooting
Assembly Replacement Sequence
................
5-2
Simplified Block Diagram
....................
5-3
StartHere.
..........................
54
Check the Green LED and Red LED on Al5 ..........
54
Check the Green LEDs on A8
................. 5-5
Measure the Post Regulator Voltages .............
5-5
If the Green LED of the Al5 Is not ON Steadily .........
5-7
Check the Line Voltage, Selector Switch, and Fuse ....... 5-7
IftheRedLEDoftheA15IsON
................
5-8
Check the A8 Post Regulator
................. 5-8
Verify the Al5 Preregulator
.................
5-9
Check for a Faulty Assembly
.................
5-11
Check the Operating Temperature
..............
5-13
Inspect the Motherboard
...................
5-13
IftheGreenLEDsoftheABarenotalION ........... 5-14
Remove AS, Maintain A15Wl Cable Connection ........
5-14
Check the A8 Fuses and Voltages
...............
5-14
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