Teledyne AX300-I manual Other Problems with the Instrument

Service Manual			AX300-I
6 (5)	6	A stuck key has been detected. The second
	(There is no	digit example (5) on the display shows
		which key is stuck:
	indication of
	which key is
	stuck)	1	- Batt
		2	- Cal
		5	- Silence
		8	- Key Lock
7(2)	7	A failure has occurred during the automatic
	(There is no	calibration of the digital to analog converter
		(DAC) circuit. The second digit example (2)
	indication of
		shows the type of digital to analog failure.
	the type of
		0 - Measurement
	DAC failure)
		1	- High Test
		2	- Low Test
		3	- Offset Cal
		4	- Gain Cal

3.9Other Problems with the Instrument

Most other problems arise from either mechanical damage from the instrument falling from a bench or table, or electronic component failure. In these units, repair or troubleshooting the PCB or individual component on the board is not feasible. It requires specialized test equipment and probes not generally available to the public. Under most circumstances a replacement of the entire PC Board is recommended. The instrument must be returned to the factory for PCB installation.

Occasionally, depending on the environment of use, keys can become stuck or function erratically due to contamination. Use a mild non-abrasive cleaner solution to periodically clean the keypad and screen. An aerosol jet spray of the type commonly used to clean computer keyboards can be used to dislodge dirt and accumulations from the keypad.

The Error Code Table (Table 3-3) includes a description of certain fault codes, which are diagnostic of some common (usually electronic) problem with the instrument. Some of these codes refer to specific components on the PCB that are problematic or have failed. These codes are useful in reporting

Teledyne Analytical Instruments 40