Figure 22 Board Trouble Isolation Flowchart - Agilent Technologies 5517B User Manual

7
Service
START
Are the +15V
NO
POWER ON
and LASER ON
LEDs lit?
YES
Is
NO
laser beam
flashing?
YES
Is red laser
NO
beam on
continuously?
YES
Is DS3 LED
flashing?
NO
(Yellow LED
on center of
A3 Controller
Board)
YES
Is DS6 LED
flashing after
NO
power on?
(Red
LED on bottom
right of A3
Controller
Bd.)
YES
Is DS2 on
after 3 or 6
YES
minutes?
(Yellow
LED on center
of A3 Contrl.
Bd.)
Replace Q3
NO
(Could be over
heated from poor
heat sinking).

Figure 22 Board trouble isolation flowchart

66
Check and replace
fuse F1 on the A1
Connector Board.
Check and replace
fuse F2 on the A1
Connector Board.
Is laser beam
NO
flashing?
Replace A2 High
YES
Voltage Power
Supply.
Is DS4 LED
flashing?
NO
(Red LED on
bottom center of
A3 Controller
Board)
Replace A3
YES
Controller Bd.
(Corrupted
EPROM).
Replace CR4 photo
diode on back of
A3 Controller Bd.
Is DS1 on 2
minutes after
YES
DS2 is on? (Yel.
LED on center
of A3 Contrl.
Bd.)
Replace Q3
NO
(Could be over
heated from poor
heat sinking).
For A3 Controller Board component
locations, see figures on the following page.
Replace
A1 Connector Board.
Is DS6 LED
Is TP8 (+15V)
flashing?
NO
to TP1 (ACOM)
(Red LED on
measuring
bottom right of
+15V?
A3 Controller
Board)
Replace A3
YES
YES
Controller Bd.
(Problem with
FPGA/EPROM).
When
DS1,2,3 turn
Is there any
off, does DS6
NO
physical damage
stay on?
(Red
to A4 Sampler
LED on bottom
Assembly?
right of A3
Bd.)
YES
Run for 24 hours
YES
to verify operation.
Agilent 5517B/BL/C/D/DL/FL User's Guide
NOTE:
Check and replace
NO
fuse F1 (left side) on
A3 Controller Bd.
Check A3 Controller
Bd for shorts from
solder or loose
hardware.
Replace A3
Controller Bd.
NO
(Component
failure).
Replace A4 Sampler
Assembly.