All Blog Entries

.. continuation of Radio Head Unit - Repair II

CD port not working
Observed on: 1 EUDM Radio
Fixed by: PCB repair, replacement of OP amp
State: Fully understood

Acid damage to the traces around the CD port OP amplifier can cause the connection to the CD changer to fail.

severe trace damage around the CD port OP amp mounting point

The CD port should be removed and cleaned. In addition to repairing ...

.. continuation of Radio - Repair

Too little Volume and Distortions increasing with Volume
Observed on: 1 EUDM Radio
Fixed by: OP amp replacement
State: Fully understood

The audio signal path on these radios is fully analogue with several operational amplifiers at various stages. One of them is IC303, a 20 V, 10 MHz quad operational amplifier from JRC/NJM: NJM2060M.

IC303 at the rear end of the lower PCB

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Introduction
Issues with the radio head unit is a common fault, affecting nearly all NSX depending on age and climate zone. Capacitor replacement should be the first step to perform, followed by further analysis and repair.

Diagnostic
The following error cases and ways of repairing have been identified so far. Almost all of them are caused by capacitor leakage but not exclusively since the radios suffer from normal wear and tear similar to other consumer audio electronics. ...

Introduction
Failure of the Climate Control Unit (CCU) is a common fault, affecting nearly any NSX. In almost any case, capacitor replacement and track repair will fix all issues. Depending on the state of the PCB, further damage to other components can happen, though.

Diagnostic - Transistor Issues
The following error cases and ways of repairing have been identified so far. These faults can be caused by major acid leakage affecting nearby transistors.

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Introduction
The NSX Gauge Cluster provides a large number of functions and displays, resulting in roughly 60 pins across two green connectors. Testing all of them manually is a error-prone task, requires special equipment and takes a lot of time. To speed things up, it helps to have a tester that provides all of these functions in a compact way and utilizing the original connectors.

Requirements
A simple user interface. Usage of the original connectors. Adaptable for multiple ...