Freedom Enterprise MisMatcher01 Rev.D Manuale - Pagina 11

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1. User Interface

VIII. TROUBLESHOOTING

The LED doesn't turn on.

1. Using a multi-meter, check

for 5V on the oscilloscope probing

points. If 5V are present, confirm

the LED is in the correct orientation.

2. If 5V are not present, use

a different Micro USB cable and

charger and check the polarity of

the diode in the PSU section.

No video output from one of

the stages.

1. Ensure the capacitors and

transistors are in the right orientation.

2. Check the voltages in

these locations.

Test condition: power on, all

DIP switch positions off, gain at full

CCW position, all 75

jumpers on,

no inputs connected.

All measures in V

Q1:

C:4.220 B:2.786 E:2.136

Q2:

C:3.374 B:4.220 E:4.880

Q4:

C:1.576 B:4.570 E:5.000

Q5:

C:5.090 B:5.060 E:4.390

Q6:

C:4.580 B:1.579 E:1.037

If your measured values are

more than 10% off, ensure you

have installed the correct resistor

values in each section.