HP 5501B Operating And Service Manual page 77

f. Disconnect A2 High Voltage Power Supply and A5 Laser Assembly cabling from A1
Connector Board. These wires connect to A1J3 and A1J4 respectively.
g. Remove A1 Connector Board Assembly.
h. To install the A1 Connector board Assembly, perform the reverse of the removal
procedure.
8-57. To remove the A2 High Voltage Power Supply from the HP5501B chassis, perform the following
procedure.
a. Remove ±15 Volt power from HP5501B Laser Head.
b. Remove front panel and side covers as described in paragraph 8-55. e. Remove the A5
Laser Assembly as described in paragraph 8-60.
c. Disconnect A2 High Voltage Power Supply cable connector A2P1 from connector A1J3.
d. Remove two Pozidriv screws (H9) that fasten the A2 assembly to the laser base (MP2).
e. Remove A2 High Voltage Power Supply from laser head chassis.
f. To install the laser assembly, perform the reverse of the removal procedure.
8-58. To remove the A3 Reference/Controller Board Assembly from the HP5501B chassis, perform the
following procedure.
a. Remove ±15 Volts from HP5501B Laser Head.
b. Remove front panel and side covers as described in paragraph 8-55.
c. Remove Pozidriv screw (H5) and flat washer (H14) that secures voltage regulator A3U7to
the shield.
d. Remove four Pozidriv screws (H5) with flat washers (H14) that secures A3 assembly to
the shield.
e. Gently extend front-panel end of A3 away from shield in order to disengage A3J2 from
A4P1 and also for A3 to clear the A4 Sampler Board tab. Disengage A3J1 from A1J1 and
remove A3 from HP5501B chassis.
f. To install the laser assembly, perform the reverse of the removal procedure.
8-59. To remove the A4 Sampler Board and/or the A6 Sampler Assembly from the HP5501B chassis,
perform the following procedure.
a. Remove ±15 Volt power from HP5501B Laser Head.
b. Remove front panel and side covers as described in paragraph 8-55.
c. Remove A3 Reference/Controller Board Assembly as described in paragraph 8-58.
d. Remove two Pozidriv screws (H2), lock washers (H12), and flat washers (H14) that
fasten the A4 Sampler board and Sampler Assembly to the sampler mount (MP1).
e. Gently remove the A4 Sampler board and sampler assembly.
f. To install the A4 Sampler board and/or the sampler assembly, perform the reverse of the
removal procedure.
HP5501B
Service
8-17