Detecto 954F Instruction Manual download pdf (Page 14)

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TROUBLESHOOTING GUIDE

The values given below are approximate.

POWER SUPPLY

1. Measure the voltage at IC3. Pin 3 = 9V, Pin 1 = 4.75 - 5.25V

A. Check soldering around IC3 and C6.

B. Check for short to GND from pins 2 and 3.

C. If no shorts are present, IC3 may be defective.

INFRARED DETECTOR

2. Measure the voltages at points: A = 5V

B = 4.25V

C = .700V

A. Voltage at point A incorrect:

1. Check R1.

2. Check for a short between point A and GND.

B. Voltage at point B incorrect:

1. Check R1, C1 for correct value.

2. Check for a short between point B and GND.

C. Voltage at point C incorrect:

1. Check R2, C2 for correct value.

2. Check for a short between point B and GND.

B A

OPERATIONAL AMPLIFIERS

3. Measure the voltages at IC1 while the unit is at standby.

Pin Voltage Pin Voltage

1 3.80V 8 ---

2 --- 9 1.62V

3 1.40V 10 1.60V

4 5.00V 11 ---

5 1.40V 12 1.52V

6 1.60V 13 1.55V

7 --- 14 1.50 - 1.60V

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 20

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Detecto 954F Instruction Manual Page 14