Table of Contents
Advertisement
TROUBLESHOOTING & REPAIR PROCEDURES
11.1.4. Internal Electronic Status LED's
Several LED's are located inside the instrument to assist in determining if the
analyzers CPU, I
11.1.4.1. CPU Status Indicator
DS5, a red LED, that is located on upper portion of the motherboard, just to the
right of the CPU board, flashes when the CPU is running the main program loop.
After power-up, approximately 30 – 60 seconds, DS5 should flash on and off. If
characters are written to the front panel display but DS5 does not flash then the
program files have become corrupted, contact customer service because it may be
possible to recover operation of the analyzer. If after 30 – 60 seconds neither DS5
is flashing and no characters have been written to the front panel display then the
CPU is bad and must be replaced.
250
2
C bus and Relay Board are functioning properly.
Mother Board
P/N 04069
Figure 11-3: CPU Status Indicator
Model 400E Ozone Analyzer
Instruction Manual
CPU Status LED
P/N 04316 Rev: B
Advertisement
Table of Contents
