Symmetricom 5071A, Сборка и сервисное обслуживание

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2. Service
Assembly/Module Diagnostic Trees (Diagnostic Section 3)
102
3.5.2.1 A9J2-to-A10J5 Cable Test
1 Disconnect cable from A9J2.
2 Connect A9J2 to a scope with 50
Ω
input impedance (If a 50
Ω
input is
absent, use the high impedance input with a 50
Ω
coaxial feedthrough
terminator at the scope end of the coax).
3 Verify presence of an 80-MHz undistorted sine wave with at least
0.6 Vp-p amplitude?
QUESTION: Does the scope show an 80-MHz undistorted sine wave
with at least 0.6 Vp-p amplitude?
If Yes: Remove power, replace cable between A9J2 and A10J5,
and retest.
If No: Go to, 3.4.1.0 (A9 diagnostic tree).
3.5.3.0 A10 Module Output Port-1 Test
1 Connect port 1 on the rear panel to the 50
Ω
input of a scope using coax. (If
a 50
Ω
input is absent, use the high impedance input with a 50
Ω
coaxial
feedthrough terminator at the scope end of the coax).
2 Verify the presence of a sine wave with an amplitude of at least
2.8 Vp-p and a frequency of 5 or 10 MHz (whichever has been selected, see
Config/Output
menu).
QUESTION: Does the scope show an undistorted sine wave with
amplitude of at least 2.8 Vp-p and a frequency of
5 or 10 MHz (whichever has been selected, see
Config/Output
menu).
If Yes: Go to, 3.5.4.0
If No: Go to, 3.5.3.1.
3.5.3.1 A10 Port-1 Frequency Error (10, not 5 MHz)
QUESTION: Is the output 10 MHz when it should be 5 MHz?
If Yes: Go to, 3.5.3.1.1.
If No: Go to, 3.5.3.2.