Figure 21 Laser Head-Primary Troubleshooting Flowchart - Agilent Technologies 5517B User Manual

START
Is red
laser beam
NO
visible (either
continous or
flashing?
YES
Is
YES
laser beam
flashing?
NO
After warmup
NO
the laser head
READY LED
remains on
YES
Is laser
NO
power output
low?
YES
Replace laser tube and
high voltage power
supply.
Figure 21 Laser Head—primary troubleshooting flowchart
Agilent 5517B/BL/C/D/DL/FL User's Guide
Check input power
Is at the laser head
NO
cable connector.
LASER ON
Pins G, H, S = GND
LED lit?
Pins K, M, T = +15V
YES
Is
front turret NO
in the correct
posiition?
YES
Indicates a problem
with the internal circuitry
of the laser head.
See the board trouble
isolation flowchart on the
next page.
Is Ref Signal
NO
present at
measurement
electronics?
YES
NO YES
Is Split Freq
within range?
Voltages OK?
±0.3V
(See note )
Reposition
turret
Note
Also check pin L for
LASER ON LED.
The 15V specifications apply when the cable is loaded with the
nominal operating current.
This adjustment assumes that all the receivers are also
connected.
Check Ref/laser
head cable
continuity.
Indicates a problem
with the internal circuitry
of the laser head.
System problem exists
See the board trouble
elsewhere.
isolation flowchart on the
next page.
Service
NO
Problem is not in the laser
head.
YES
Check the following:
1. Laser head cable
2. Laser head power supply
(10884 or other)
3. Measurement electronics
power supply (5507 only)
-15V ±0.3V (although it does not affect
Replace Ref/
NO
Is it OK? laser
head cable.
YES
7
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