Waters 2998, Overview And Maintenance Manual

Page: 58 / 94

December 5, 2017, 715004753 Rev. B
Page 58
4.2.4 Detector troubleshooting
Table 4–3: 2998 PDA detector troubleshooting
Symptom Possible cause Corrective action
Both LEDs unlit No electrical power 1. Inspect line cord
connections.
2. Test electrical outlet for
power.
Open (spent) or defective fuse Replace fuse (see page 51 ).
Change in reference spectrum Mobile phase contains gas or
is contaminated
Prepare fresh mobile phase,
and degas thoroughly.
Air bubbles trapped in flow cell Reseat and check alignment
of flow cell.
Flush the flow cell (see
page 47 ), or apply slight
backpressure of 207 to
345 kPa (2 to 3 bar, 30 to
50 psi) on the detector waste
outlet. For example, connect a
1- to 2-foot (30- to 60-cm)
length of 0.009-inch (0.23-mm)
ID tubing connected to the
detector waste outlet.
Continuous audible tone Detector failure Cycle power to the detector.
Detector not responding to
console Bad or disconnected cable Inspect cable connections,
tighten connectors, or replace
cable.
Configuration problem Check Ethernet configuration.
For details, see Empower
online Help.
Lamp light flashes green and
power light constant green The detector is initializing. No corrective action required.
Wait until initialization
completes (both lights
constant green).