A2 High Voltage Power Supply Circuit Theory - Agilent Technologies 5517B Operation And Service Manual

WHERE MAINTENANCE CAN BE PERFORMED WITHOUT POWER
APPLIED, THE POWER TO THE EQUIPMENT SHOULD BE REMOVED.
WARNING
FROM 1.2 KILOVOLTS TO 12 KILOVOLTS DC IS PRESENT ON THE
ANODE OF THE LASER TUBE IN THE HP 5517B. EXERCISE EXTREME
CAUTION WHEN WORKING INSIDE THE INSTRUMENT. THE HIGH
VOLTAGE
CONTACTED. THE INSTRUMENT SERVICE SHOULD BE PERFORMED
BY SERVICE-TRAINED PERSONNEL ONLY.
8-85. The following procedure can be used as an operational check of the rear panel LEDs. Perform only if a problem
is suspected.
a. With power disconnected from laser head, remove HP 5517B instrument covers as described in
paragraph 8-57,
b. Apply power to laser head as per Figure 4-1. (Use HP 6255A Dual DC Power Supply or its
equivalent or reconnect the laser head to the HP 5501A or HP 5527A system electronics.)
c. Within 10 minutes of applying power to the laser head, the rear panel LEDs should reflect the following
status.
+15V POWER ON ...................................................................... ON
-15V POWER ON ....................................................................... ON
READY ....................................................................................... FLASHING
LASER ON ................................................................................. OFF
d. Disconnect power from laser head.
e. CAREFULLY remove -15 Volt fuse (A1F2) from its A1 board location.
f. Re-apply power to laser head.
g. The rear panel LEDs should reflect the following status.
+15V POWER ON ...................................................................... ON
-15V POWER ON ....................................................................... OFF
READY ....................................................................................... FLASHING
LASER ON ................................................................................. OFF
h. Disconnect power from laser head.
i. CAREFULLY return -15 Volt fuse (Al F2) to its A1 board location.
j. CAREFULLY remove +15 Volt fuse (A1F1) from its Al board location.
k. Re-apply power to laser head.
l. The rear panel LEDs should reflect the following status.
+15V POWER ON ................................................................... OFF
-15V POWER ON .................................................................... ON
READY ..................................................................................... OFF
LASER ON ............................................................................... OFF
m. Disconnect power from laser head.
n. Carefully return +15 Volt fuse (A1F1) to its Al board location.
o. Re-apply ±15 Volts to rear panel connector.
p. Wait until the rear panel LEDs reflect the following status.
+15V POWER ON ................................................................... ON
-15V POWER ON .................................................................... ON
READY ..................................................................................... ON
LASER ON .............................................................................. ON
q. Disconnect power from laser head.
r. Re-install front panel and side covers of laser head.

8-86. A2 HIGH VOLTAGE POWER SUPPLY CIRCUIT THEORY

COULD CAUSE SERIOUS PERSONAL INJURY IF