5-29
Troubleshooting
Figure 5-16. 064819—Analog Output Module (Continued)
064819 - Analog Output Module
(Continued)
Power
Supply
Clock
Digital
Video
Inputs
Sync, Setup
& Clamp Pulse
J1 Pin 35 = -5.2V
J1 Pin 36 = -5V
J1 Pins 21 & 22 = +5V
J2 Pins 5 & 6 = +5V
J2 Pins 11 & 12 = -5V
Remove mezzanine
and verify operation of
regulators and filters
Works
properly
Suspect a short
on the mezzanine
Verify polarity of
tantalum decoupling
capacitors.
Feel for hot spots
in carrier section.
27 MHz at DAC
mezzanine input
J1 Pin 2
Not
Present
Trace clock signal
back through the
clock driver circuit
Send a ramp signal to
output in question.
Examine digital inputs
on mezzanine:
Y = J1 Pins 3-14
R-Y = J1 Pins 23-34
B-Y = J1 Pins 39-50
Each succeeding least
significant bit (LSB)
should appear to
change at double the
rate of the previous LSB.
Externally trigger
Oscilloscope on color
black or similar video
reference signal.
or
J1 Pin 18 = 60 MHz Standard
Verify a positive 5V sync
signal is present and
synchronized to
existing reference
Probe
J1 Pin 1 = 50 MHz Standard
Probe J1 Pin 16
Check for Setup.
Works
properly
Probe J1 Pin 15
Clamp Control
(Asserts positive edge
of sync for 2 µSec
duration on every
horizontal line
(except Vertical Sync)
If DAC mezzanine is receiving all required signals
and is not producing an output, contact customer
service for instructions.
Summary of Contents for Grass Valley 4000
Page 3: ...iii Tektronix Grass Valley Products P O Box 1114 Grass Valley CA 95945 916 478 3800 ...
Page 4: ...iv Tektronix Grass Valley Products P O Box 1114 Grass Valley CA 95945 916 478 3800 ...
Page 34: ...1 20 Section 1 System Overview ...
Page 138: ...2 104 Section 2 Installation ...
Page 196: ...3 58 Section 3 Functional Description ...
Page 286: ...Index 6 Index ...