HP 5501B Operating And Service Manual page 88

d. Within 10 minutes of applying power to the laser head, the rear panel LED's should
reflect the following status.
e. Disconnect power from laser head.
f. Using a pair of insulated long-nose pliers, CAREFULLY remove -15 Volt fuse from A1
board. Pull fuse straight out: DO NOT TWIST.
g. Reapply power to laser head.
h. The rear panel LED's should reflect the following status.
+15V SUPPLY UNBALANCE
-15V SUPPLY UNBALANCE
+15V FUSE
-15V FUSE
i. Disconnect power from laser head.
j. Using a pair of insulated long-nose pliers, CAREFULLY return -15V fuse to its A1 board
location. Remove +15V fuse. Pull fuse straight out: DO NOT TWIST.
k. Reapply power to laser head.
l. The rear panel LED's should reflect the following status.
+15V SUPPLY UNBALANCE
-15V SUPPLY UNBALANCE
+15V FUSE
-15V FUSE
m. Disconnect power from laser head.
n. Replace both fuses in A1 Connector board sockets.
o. Reapply ±15 Volts to rear panel POWER connector.
p. Set TEST-NORM switch (A1S2) to TEST to re-enable the High Voltage Power Supply.
q. Wait until the rear panel LED does reflect the following status.
r. Adjust +15 Volt supply to +17 Volts.
8-28
+15V SUPPLY UNBALANCE
-15V SUPPLY UNBALANCE
+15V FUSE
-15V FUSE
+15V SUPPLY UNBALANCE
-15V SUPPLY UNBALANCE
+15V FUSE
-15V FUSE
ON +15V POWER ON
ON -15V POWER ON
OFF READY
OFF LASER ON
ON +15V POWER ON
OFF -15V POWER ON
OFF READY
ON LASER ON
OFF +15V POWER ON
ON -15V POWER ON
OFF READY
ON LASER ON
OFF +15V POWER ON
OFF -15V POWER ON
OFF READY
OFF LASER ON
HP5501B
Service
ON
ON
OFF or FLASHING
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON