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Document revision 1.1 – Last modification : 27/05/21
EQ573-II Assembly guide – Main board
2. PCB to PCB connector J3a, J4a, J5a, J6a
Insert the male 2x10 and 2x5 connectors into the corresponding
female parts and position them on the main PCB back. The female
connectors must sit flat on the side. Solder two pins, check
position then solder the other pins.
After soldering you can remove the female part.
Warning
: These connectors are inserted at the back of the PCB
and soldered on top.
3. Resistors
The best method to select and install the resistors is the following:
1. pick a row of resistors in the resistors bag,
2. Measure one of the resistors with your DMM,
3. Look up the parts-list PDF for the closest value,
4. Check the color code and quantity for confirmation,
5. Use the search function on the Layout PDF page with the resistor value: All the corresponding
resistors are highlighted,
6. Insert and solder.
(You can use the same method later, for the capacitors)
Add all the resistors of the main PCB (black identifier in the parts list).
Control the resistor values with a digital multimeter. Bend the leads at 0.4” with a lead forming tool.
Warning
: It is very important to check the resistors value with a DMM because the color code can
sometimes be ambiguous. For example 1kΩ (brown-black-black-brown-brown) can be confused with 110Ω
(brown-brown-black-black-brown).
4. Diodes
Add D1 to D4. Use a lead forming tool to bend the leads at 0.4”.
Warning
: Make sure to respect the direction of the diodes which is marked by a ring on the component
and a double line on the PCB marking.
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