Agilent Technologies 5517B

66 Agilent 5517B/BL/C/D/DL/FL User’s Guide
7 Service
Figure 22 Board trouble isolation flowchart
STA RT
Is
laser beam
flashing?
YES
YES
NO
YES
YES
YES
NO
NO
YES
NO
Are the +15V
POWER ON
and LASER ON
LEDs lit?
Check and replace
fuse F1 on the A1
Connector Board.
NO
Check and replace
fuse F2 on the A1
Connector Board.
NO
Replace CR4 photo
diode on back of
A3 Controller Bd.
Replace
A1 Connector Board.
Replace A2 High
Voltage Power
Supply.
YES
Replace A3
Controller Bd.
(Corrupted
EPROM).
Replace A3
Controller Bd.
(Component
failure).
Check and replace
fuse F1 (left side) on
A3 Controller Bd.
YES
Replace A3
Controller Bd.
(Problem with
FPGA/EPROM).
YES
Check A3 Controller
Bd for shorts from
solder or loose
hardware.
Is red laser
beam on
continuously?
Is laser beam
flashing?
Is DS3 LED
flashing?
(Yellow LED
on center of
A3 Controller
Board)
NO
Is DS4 LED
flashing?
(Red LED on
bottom center of
A3 Controller
Board)
NO
Is DS6 LED
flashing?
(Red LED on
bottom right of
A3 Controller
Board)
Is DS6 LED
flashing after
power on?
(Red
LED on bottom
right of A3
Controller
Bd.)
NO
Is TP8 (+15V)
to TP1 (ACOM)
measuring
+15V?
NO
YES
YES
Replace Q3
(Could be over
heated from poor
heat sinking).
Replace Q3
(Could be over
heated from poor
heat sinking).
YES
Run for 24 hours
to verify operation.
YES
Is DS2 on
after 3 or 6
minutes?
(Yellow
LED on center
of A3 Contrl.
Bd.)
NO
Is DS1 on 2
minutes after
DS2 is on? (Yel.
LED on center
of A3 Contrl.
Bd.)
NO
DS1,2,3 turn
off, does DS6
stay on?
(Red
LED on bottom
right of A3
Bd.)
NO
Is there any
physical damage
to A4 Sampler
Assembly?
When
Replace A4 Sampler
Assembly.
For A3 Controller Board component
NOTE:
locations, see figures on the following page.