Serinus 51 User manual 1.0
Troubleshooting
65
7
Troubleshooting
Table 3 Troubleshoot list
Problem
A/D conversion
error
Temp/press error Replace main PCB
Input pot limited to
0 or 255
Damaged Lamp Check that lamp current is between 21
& 35mA. If not replace Lamp driver
board. If pot still 255, replace UV lamp
Zero Flow Multiple Troubleshoot 7.1
Reset Detection Upgrade firmware
Electronic zero
adjust
Faulty zero air or
pneumatics
Troubleshoot 7.2
12 Voltage supply
failure
Power supply has
failed
Replace power supply
Cell temperature
failure
Troubleshoot 7.3
No display
AC power 1. Verify that the line cord is connected.
2. Check that the power supply fuse is
not open. The fuse should be 5A (115
V) or 3A (230 V).
3. Verify that the voltage switch is in the
proper position.
Contrast
misadjusted
Set or adjust the display contrast by
simultaneously pressing two keys on the
front panel as follows:
- Contrast: Press Up arrow () for
darker contrast, Down arrow () and
<Select> for lighter contrast.
DC power Verify that the power supply is
providing ± 12V + 5V DC
Display Check the interface cable between the
display and the microprocessor board.
Bad display or
Microprocessor
PCA
1. Replace the front panel display.
2. Replace the microprocessor board.
3. A bad cable is unlikely, but if you
suspect it, perform a pin-for-pin
continuity test using an ohmmeter.
Noisy or unstable
readings
Leaks A leak dilutes the sample stream and
causes low span readings and noise.
Lamp not correctly
positioned
Adjust the UV lamp. If you are unable
to obtain an acceptable reading, replace
the lamp.
TE cooler or
Reaction cell heater
A failed temperature control allows the
instrument zero to drift with ambient
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