5.22
If the +5V is low and no current is being drawn, check the voltage regulator.
If either of the +8v or -8V supplies are low then replace the pcb 01100919. See Section 5.3.6.1.
5.2.2.1 Transformer Test
Note: Disconnect electrical supply to PSU when making connections/disconnections in
the following test.
1. Remove PSU from analyser, See Section 2.6.1, paragraphs 1 to 3.
2. Remove connector from TB-B.
3. Remove brown wire from Pin 1 adjacent to D2 on pcb 01100919.
4. Measure voltage between brown wire and Pin 6. It should be 10.2V ac ±0.3V.
5. Remove brown wire from Pin 2 on pcb 01100919.
6. Measure voltage between brown wire and Pin 6. Should be 10.2V ac ±0.3V.
7. Measure voltage between the two brown wires. Should be 20.4V ac ±0.5V.
8. If these voltages are not correct the transformer may be faulty and should be replaced.
9. If these voltages are satisfactory then reconnect the brown wires to Pins 1 and 2.
5.2.2.2 Heater Supplies and Control Circuits.
Lack of power to the heater may be due to one of the following causes:
1. Heater fuse (F2) failure (See Table 5.2).
2. Faulty heater element (See Section 5.2.3).
3. Faulty heater control circuits.
4. Faulty transformer.
5. Faulty microprocessor board 01100918C or 01100918D.
6. Failure of thermal fuse in 1131 Transducer unit due to overheating.
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