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Chapter 5---Troubleshooting
5-5 Model 330, 340SC, and 370SC Service Manual
5.3 Break Points
Break Points (or Trap Processing) handle internal interrupts generated by the
processor, such as: bus errors, illegal instruction, and divide by zero commands.
Perform the following steps to setup for break codes (trap processing):
1. Access MAIN MENU and select #4 (DIAGNOSTICS MENU).
2. Select #7—this is an invisible menu item.
3. Press ENTER to clear the displayed break (trap) data.
When a break (trap) occurs, the CPU stops normal operation and outputs a code to
the LED located at the rear of the projector. The code consists of the character “e”
followed by a “2” through “C.” The error code displays in a continuous loop.
Error codes and explanations are provided in Table 5-3.
Table 5-3
Break Point (Trap Processing) Error Codes
Code Meaning Description
2
Bus error. Probably electrical noise.
3
Address error. Noise or program bug.
4
Illegal instruction. Noise or program bug.
5
Zero divide. Program bug.
6
CHK instruction. Unlikely—may be a bug.
7
TRAPV instruction. Unlikely—may be a bug.
8
Privilege violation. Bug.
9
Trace. Noise.
A
Line 1010 emulator. Noise.
B
Line 1111 emulator. Noise.
C
Spurious interrupt. Hardware.