Shimadzu RF-20A - Base ASSY, XS (including Peltier Unit) Replacement Procedure; 16.1 Checkpoint of a Base ASSY,XS

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(4) Adjust the "-HV SENS2 xxx" voltage value according to the "-HV SENS2 xxx" value in
the FACTORY mode, so that signal value on the WS matches the F value recorded before
replacing the photomultiplier (50, for example).
15.6.3 Adjusting [Sens1]
(1) Set [GAIN] to 1 (x1) and [SENS] to 1 (high).
(2) Set [EX] to 350 nm and [EM] to 450 nm, then adjust the zero position.
(3) Adjust the EM wavelength(397nm, for example) to the peak value of the Raman
spectrum of water and output the F value on the WS.
(4) Adjust the "-HV SENS1 xxx" value according to the "-HV SENS1 xxx" value in the
FACTORY mode, so that signal value on the WS is 400, 8 times the F value (50).
15.6.4 Adjusting [Sens3]
(1) Set [GAIN] to 3 (x16) and [SENS] to 3 (low).
(2) Set [EX] to 350 nm and [EM] to 450 nm, then adjust the zero position.
(3) Adjust the EM wavelength(397nm, for example) to the peak value of the Raman
spectrum of water and output the F value on the WS.
(4) Adjust the "-HV SENS3 xxx" value according to the "-HV SENS3 xxx" value in the
FACTORY mode, so that signal value on the WS is 6.25, 1/8 of the F value (50).
(5) [Z WAVE] is changed into 0 and carried out as before.
Chapter 16 is an additional page.
16 Base ASSY, XS (including Peltier Unit)
Replacement Procedure
16.1 Checkpoint of a Base ASSY,XS
The Base ASSY, XS (P/N: 228-45892-91) and the Peltier ASSY (P/N: 228-51008-41) is a set
unit. The Peltier ASSY cannot be purchased as a single piece of a maintenance part.
Accordingly, regardless of the Peltier ASSY replacement, the both ASSYs have to be replaced
together.
No.
Component name
Measured positions
Resistance value
1
Peltier
Red – black cable
1.256～1.536Ω(25degC)
2
Thermistor
Black - black cable
About 12.5 kΩ(20 degC)、10.2 kΩ(25
degC)、8.3 kΩ(30 degC)
3
Overheat breaker
(thermostat)
Brown - red cable
Normal closing 60±5 degC
4
Circuit Diagram of
Heater ASSY
(Transistor)
(Transistor)