Tektronix Grass Valley 4000, Installation And Service, Page: 239 / 286

5-5
Troubleshooting
Individual Module Troubleshooting
As mentioned earlier, the service philosophy for the Model 4000 is to troubleshoot
switcher problems down to the module or assembly level and replace that module
or assembly with a spare or a board exchange from the nearest GVP Customer
Service facility. Given below is a procedure for determining the defective module
or assembly. The switcher problem is isolated according to an operational
function, identified as a subpanel name on the main control panel or a menu in the
softpanel. The problem is then traced to a module or assembly using a
troubleshooting tree which describes a board swap method.
Follow the steps below to determine which module or assembly may be at fault:
1. First, consult the cross reference tables of Subpanels ( Table 5-1 ), and Menus
(Table 5-2) given on the following pages to isolate the problem to a specific
subpanel or to define a function on the main control panel. For example, you
might be having a problem setting the CLIP and GAIN in the Keyer subpanel
of M/E 1 Key 1. Refer to the Keyers Subpanel heading in
Table 5-1 .
2. For each subpanel or function a list of modules is then given which are most
likely associated with that switcher function. The first module in the list is the
most likely to be at fault, then in descending order, the other modules are
given which might be suspect.
Figure 5-1 and Figure 5-2 show the module locations in the A, B, C and D bays
of the Signal Processor Frame. The slot number of each module is also given in
the tables.
In the example above, the first module to try swapping will be the 064804
Keyer Carrier Module in Slot A6 (ME1K1).
3. Now, go to the 064804 Keyer Carrier Troubleshooting Tree in Figure 5-7 .
Follow the instructions given in the tree for swapping the modules.
4. If swapping the 064804 Keyer Carrier and associated mezzanines did not fix
the problem, you would move to the next module in the list, the 064813 Mixer
Module. Go to the troubleshooting tree for this module and follow the
instructions.
5. Continue on through the module list under the Keyers Subpanel attempting to
find the faulty module. If a faulty module is found you will need to have it
replaced by GVP Customer Service.
6. If you cannot locate a faulty module using this method, more detailed
troubleshooting involving GVP Customer Service may be needed to solve the
problem.
Table 5-1 and Table 5-2 give the subpanel or menu name and/or function where
the problem may exist. Follow the recommended order of each module when
using the procedure. Refer to each individual module procedure for swapping
instructions.
Figure 5-3 gives some common video and timing problems you may
encounter with the system.