b. Interconnect the test equipment as shown in
column of table 8-8. Typical voltage readings are shown
on the power supply schematic diagram, figure FO-18.
Use these voltages as a troubleshooting aid for isolating
the ac power source as yet.
a suspected faulty circuit and/or component.
c. On the test fixture check for or perform the
To gain access to the power supply for taking
voltage measurements or removing a component, the
(1) POWER LINE CIRCUIT BKR, is in the
power supply must be disassembled. The disassembly
OFF (down) position.
(2) ALL LOAD switches are in the F. L.
(3) The four wire jumpers are inserted in each
pair of CURRENT T. P. test points for each of the four
Alarm Monitor Power Supply Disassembly
(4) The CURRENT LIMITING + 24 V ADJ.
and + 15 V ADJ. controls are in the fully CCW position.
If desired, support fixtures may be fabricated to properly
(5) The CURRENT LIMITING + 24 V and +
support the various printed circuit boards after the power
15 V switches are in the OFF position.
supply is disassembled. See figure 8-8 for fabrication
details for support fixtures. Refer to figure 8-9 when
d. General reference may be made to the test
performing the disassembly procedure below. After
fixture and power supply schematic diagrams figures
disassembly, refer to figure 8-10 for typical use of the
support fixtures. Proceed as follows to disassemble the
e. When a circuit or component is suspected of
being faulty, perform the checks listed in the Remarks