Teledyne M5000B operating instructions Equipment Required

Part II: Maintenance/Analysis Unit Maintenance 5

5.5Service Procedures and Adjustments

5.5.1 Electronics

TAI aligns the system’s electronics. However, you may need to touch up the circuitry, using the following procedure.

Equipment Required:

Oscilloscope (dual trace is preferred, but not required) To observe oscilloscope test points switch the vertical input selector of the scope to DC.

Switch to AC to observe the demodulator switch signals.

DVM (Digital Voltmeter)

PC Board Extender

Use the PC board extender whenever you need to adjust trimpot. Because all PC board connectors are keyed to avoid wrong positioning in the connectors, you must remove the key and after testing you need to replace the key with long-nosed pliers. Turn off the power during this operation. Never disconnectorconnectthePCboardswiththepoweron,becauseyoumaydamage the PC board C-MOS devices.

5.5.2 Power Supply Test Points

Measure+15volt±1voltDCand-15volt±1voltDConthedifferentialpower supplyPCboardinthecontrolunit. Refertothepowersupplyschematicintheback of the manual to identify the power supply test points.

5.5.3Setup of the Signal Processing Front-End Amplifiers

Fill the sample cell with air or a stable fluid, such that the photo energy that strikes the detector is constant. A stable fluid is distilled or tap water. This step may be omitted when the system is stable in its present state.

Teledyne Analytical Instruments

Part II: 5-3