Hardware Troubleshooting
TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual
4–31
Figure 4–19 is a troubleshooting chart that may help you locate faults within the
chassis.
No
Begin
Front panel
LED on?
Remove all modules
except the controller.
Turn on the mainframe
power switch.
No
Yes
Blower
operates?
Yes
Blower
operates?
Supply
voltages OK?
(Fig. 4–18)
No
Yes
No
Yes
Yes
Check for failure at blower
(Fan) control board,
blower cable, or blower
No
No
Yes
Power off mainframe.
Mainframe OK.
Check for failure at
power supply,
backplane board
(blown fuse or bad board)
No
Yes
Power cord
connected to
mainframe and
power source?
Rear-panel
fuse closed?
Yes
No
Replace
rear-panel
fuse.
Plug in cord at
both ends
Check for failure at
power supply
Check for failure at
front-panel LED,
LED cable from LED to J22 on
backplane board, or
series resistor (R60) on enhanced
monitor board (49.9
Ω)
+5VM
voltage OK?
(Fig. 4–18)
Supply
voltages OK?
(Fig. 4–18)
Figure 4–19: Primary troubleshooting procedure
Troubleshooting and Fault
Isolation Procedure
Summary of Contents for TLA 720
Page 13: ...Table of Contents viii TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 22: ...Specifications...
Page 23: ......
Page 38: ...Operating Information...
Page 39: ......
Page 105: ...Command Groups 2 66 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 111: ...TEST Subsystem 2 72 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 124: ...Theory of Operation...
Page 125: ......
Page 128: ...Maintenance...
Page 129: ......
Page 155: ...Jumper Settings 4 26 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 178: ...Options...
Page 179: ......
Page 182: ...Diagrams...
Page 183: ......
Page 186: ...Replaceable Mechanical Parts...
Page 187: ......
Page 198: ...Replaceable Parts TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual 7 11...
Page 203: ...Replaceable Parts 7 16 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 204: ...Index...
Page 205: ......
Page 211: ...Index Index 6 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 212: ......
Page 213: ......