YL9170 RI Detector
1) Use a multimeter to check the lamp voltage at the test point on the circuit board. The lamp
voltage should be set 3.3 ± 0.3V.
2) If the sum voltage is only a few millivolt the light bulb does not work. Chekc the power cables of
the light source to make sure that they are connected properly.
3) The sum voltage should be in the region of 5000 ± 500mV. If this is not the case adjust the lamp
voltage by turning the potentiometer R19 until the sum voltage is in the region of 5000 ± 500mV.
4) Due to the adjustment of the light intensity it is necessary to check the lamp voltage again.
4-4. Check and replacement of the valve
If the valve which is used to switch the path of the mobile phase in the normal mode and purge mode
needs to be replaces follow the following steps:
- Swtich off the YL9170 and unplug the main cable.
- Remove the stainless steel capillaries from the valve body.
NOTE
Remind the position of the capillaries for proper reconnection.
1) Loosen the control cable of the valve at the main circuit board.
2) Loosen the two screws holding the valve body.
3) Remove the valve body and replace with the new one.
4) Tighten the holding screws and reconnect the capillaries in the correct positions.
5) Connect the signal cable to the contact labelled Valve on the main board.
6) Start the pump to flush mobile phase
L9170
7) Check the capillary connections for any leakage.
8) Close the instrumet’s housing.
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