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