Troubleshooting Electronic Problems
Contents
1. TELEDYNE ANALYTICAL INSTRUMENTS www teledyne ai com Models 402 402R 402REU Troubleshooting Electronic Problems 1 Remove the AC power and disconnect the red coaxial signal cable from the electrometer PC board 2 Set the zero pot mid range at 500 and the span pot at 300 3 Set the range switch to the low range position 4 Turn on the power to check the output of the amplifier circuit 5 Connect a DC voltmeter with the negative lead to span pot CCW common 6 Connect the voltmeter positive lead to the red wire on the range switch SW2 terminal H 7 Verify zero volts 20 millivolts If not adjust potentiometer P1 on the electrometer board Check linearity 1 Move positive lead to Test point TP1 on the motherboard to check 0 1 VDC full scale 2 Adjust Zero pot from 500 up until the meter reads 1 volt DC at TP1 3 The analyzer digital display meter should read full scale of low range 2 0 PPM If not adjust the pot behind the display meter 4 Switch to the middle range verify TP1 100 millivolts and display 2 0 PPM 5 Switch to the high range verify TP1 10 millivolts and display 2 0 PPM
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