Ren-W Troubleshooting

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The Ren-W circuit board is a very simple design but good soldering technique is still extremely important.

Voltage Measurements: three test points are just below pin 16 of the MAX232 chip/socket:

  • Some components have specific mounting requirements:
  • The notch on the MAX232 chip faces to the right, toward the U1 voltage regulator.
  • The zener diode (D1) has the black stripe on the TOP, next to the JP6 header pins.
  • The 3.3 voltage regulator (U1) has the metal tab facing up, toward the JP2 header pins.
  • The electrolytic capacitor (C3) has the - strip facing DOWN toward the LED, which means the + side is up toward the J2 jack.
  • The LED (D2) while not shown in this photo, has the cathode (flat side) facing the mounting hole to its right.
  • Resistor R1 (33 ohms) is immediately below the MAX232 chip. The resistor has no polarity concerns.
  • Resistor R2 (1k ohms) is immediately to the left of the LED. The resistor has no polarity concerns.
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