General Service Information; Troubleshooting Procedure - HP 8447D Operation And Service Manual

Model 8447D/E/F
Page 27
65. TEST EQUIPMENT AND ACCESSORIES
REQUIRED FOR TROUBLESHOOTING
66. Test Equipment and accessories required to
troubleshoot the amplifier are shown in Table 2.
Test instruments other than those listed may be
used provided their specifications meet or exceed
those listed in Table 2.
67. GENERAL SERVICE INFORMATION
68. The part reference designator is the assembly
designator plus the part designator. (Ex¬
ample: A1R9 is R9 on the A1 Power Supply
Assembly.) Refer to the parts list on Table 4, 5 or
6 for specific component description for ordering
parts.
69. TROUBLESHOOTING PROCEDURE
70. First check the input and output cables.
Isolate trouble to the amplifier(s) or power supply
by checking the +20 volts at XA1—14 after
removing the red wire from C2. If the voltage is
present, replace the amplifier (re-attach the red
wire to C2). If voltage is not present or incorrect,
check the power supply. The voltages shown are
typical with the amplifier(s) disconnected from the
power supply.
Equipment:
Digital Voltmeter .... HP 3440A/344A
Cable Assembly (w/test clips) . HP 10501A
Adapter .HP 10111A
Figure 14. A1 Power Supply Component Locations