Phenomenon:
- Sub-band reception is deteriorate or receiving audio is intermittent distortion.
- Transimission monitorring audio is distorted.
If you find the malfunction at stated above, take the following procedure.
Cause:
Cold solder joint od resistor block; CP1-CP4 in the PLL unit (X50-3170-00). In the manufactoring process, the temperature in the reflow soldering furnace was lower than specified and the connection was insufficient.
- Temporary: Add more solder to the resistor block; CP1-Cp4 (at all pins) in meassure the PLL unit (X50-3170-00).
- Permanent: review the whole temperature control system of the reflow furnace to manufacture the Printed Circuit Board at more adequate temperature.
PC Board (Component side view).
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