Moog Components Group
Mini4, Rev C
February 23, 2009
(201580-xxx And 201590-xxx)
Page 16 of 19
1.3.6
Power Section Testing
NOTE: There are connectors on the bottom of the Video Input and Output boards have pins that are
connected to +5VDC and ground. If these pins are inadvertently shorted together or to a common
chassis ground, the board fuse (F3 on Input/F4 on Output) will blow.
If the +5V Power LED, +3.3V Power LED and +2.5V Power LED are out:
Check for continuity of fuse F3/41 with an ohmmeter.
Replace fuse if damaged.
If only the +3.3V Power LED is out:
5VDC across C42 (replace board if +5VDC is not available)
3.3VDC across C40 on top of board
If +3.3V is not available replace the board with a spare.
If +3.3V is available check the display LED (D7).
If only the +2.5V Power LED is out:
5VDC across C35 (replace board if +5VDC is not available)
2.5VDC across C47 on back of board
If +2.5V is not available replace the board with a spare.
If +2.5V is available check the display LED (D6).
If D1 is not on and Daughterboarrd operation is required:
Verify that either F6 (for +3.3VDC to D/B) or F5 (for +5VDC to D/B) is placed and is not blown
Replace fuse if damaged (it is a surface mount)
Verify proper voltage at connector J1
If Voltage is available check the display LED (D1).
1.3.7
Optical Section Testing
If the FIBER LED, RMT LINK LED and/or LOC LINK LED are off or flickering, one or more of the
following conditions is likely:
The fiber is broken or damaged.
The optical transceiver module is defective.
Excessive light loss (low received optical power) is being experienced.
The Mini4 board (not the optical transceiver module) is malfunctioning.
There is not enough attenuation in the optical link and the receiver is saturating.
If excessive optical loss is being experienced, the following conditions may be present:
May have horizontal lines or random white dots on video monitors.
Check the optical level with an optical power meter and inspect all fiber optic connections
including WDM/CWDMs and slip rings.
