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Model 5501A
Maintenance
SECTION I V
MAINTENANCE
4-2.
This section provides information to facilitate 5501A laser head maintenance at the replaceable
module kvel. Included are performance checks, instrument access procedures, a troubleshooting flow
chart, troubleshooting diagrams, and adjustment procedures. When a faulty module i s isolated, the trouble
may be further isolated to the component level by using the functional theory provided in Section Ill of this
manual.
4-3.
PERFORMANCE CHECK
4-4.
When a new 5501A is received, or normal operation is in doubt, this test may be performed to
determine if the unit is operating properly. The + I 5 Vdc and -15 Vdc are derived from external power
supplies. If necessary, adjust these power supplies to conform to parameters in Tables 4-1 and 4-2. The
following test equipment is recommended:
HP 1707 Oscilloscope or equivalent ( 2 MHz measurements)
4-5.
Check the 5501A voltages in the following manner:
a. Disconnect the POWER cable.
b. Measure the voltages at the disconnected cable plug as outlined in Table 4-1.
Table 4-1. Input Voltage
I
plug pin
I
Voltage
I
c.
Connect the plug to the 5501A POWER connector. Disconnect the DIAGNOSTIC plug and perform
the voltage measurements according to Table 4-2.
Table
4-2.
Voltages at Diagnostic Connector
I
Voltage
Connector Pin
I
D'ACNOST'C
I
*Voltage provided by 5501A circuits.
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