Indicator function of the diagnostic card:
CLK: No matter ISA or PCI , as long as there is a empty board (no CPU etc.) , the light should be on when power on , otherwise , the CLK is failure
BIOS: Mothermoard running , the light will fash while there is a reading operation on the BIOS.
IRDY: The light will flash when having a IRDR , otherwise , it will not lignt on.
OSC: Empty board powered on , the light will be constant on , when there is the ISA slot have main vibration , otherwise , failure of oscillation.
FRAME: The light will flash when there is circular frame . Light will constant on in peacetime
RST: Reset
RESET: power on or press the RESET switch , the light will be on for half second and then be off. Because , if light is not off , the reset pin on motherboard connected to the acceleration switch or the reset circuit broke down.
12V: Empty board powered on , the light should be constant on , otherwise the voltage or motherboard has a short circuit.
12V: Do ditto
5V: Do ditto
5V: Do ditto (only for ISA slot).
3V3: This 3.3V voltage is unique for PCI slot. Empty board powered on , the light should be constant on. Some of PCI slot motherboard has not this voltage , the light should be off.

Specifications:
Usage: Maintenance tools for computer motherboard
Specifications: All produced by patch components , do not hurt your hands , LCD characters display
Color: Shown as the picture
Package weight: 48g

Package Include:
1 x Diagnostic Card
1 x English User Manual