5-24
Section 5 — Troubleshooting and Diagnostics
Figure 5-11. 064808—Tally Control Module (Continued)
totally broken, the diagnostics can identify a faulty part. To use the “DIAG” test point,
The µprocessor software contains some self-diagnostic routines. If the µprocessor is not
# Of
Pulses
Error
Code
Comment
Ø
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
No Error
CPU
ROM Checksum
Timer
Interrupt
External RAM
RX Buffer Full*
RX Overrun*
RX Framing*
RX Checksum
Crosspoint
Illegal Mode
Illegal Relay Number
Illegal Relay Mode
Frame Store
RX No Data
Infinite Loop
Watchdog
RX Noise*
RX Frame*
No errors found
CPU’s internal RAM has failed
ROM Checksum did not verify correctly
Internal timer is not functioning
External interrupt is not functioning
Address or Data error has occurred in RAM
Communications Receiver’s circular buffer overflowed
Communications Receiver received byte faster than it could process
Communications Receiver framing error
Incoming message packet with invalid checksum, corrupt data
Illegal Crosspoint number received, exceeds boundary (Software Error)
Illegal mode selected on DIP switches; check settings
Relay number outside memory mapping (Software Error)
Software Error
Frame Store Variable out of range (Software Error)
Lack of data from host processor causing reset error
Infinite loop detected (Software Error)
Watchdog Timer has timed out
Communications port noise error
Communications port framing error
The meaning of the error codes are given in the following table:
connect oscilloscope to TP1, “DIAG”, and view repeated 5V logic pulses.
* Check the RS-422 Data lines and the Input Buffer U32.
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 ...