UC Sports Instrument Cluster

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Page created by T Nov 11th 2008:

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UC Sports Instrument Cluster. Click to Enlargen. Photo by T.

UC Sports Instrument Cluster:

UC Sports Instrument Cluster Rear View. Click to Enlargen. Photo by T.

Thermal Gauges:

The 2 upper Gauges are the Thermal type. A Heater Element wired to a Bi-metal Strip causes each Needle to deflect. They are subject to drift with Temperature i.e they overread whenever the Dash Bulbs are illuminated.  
UC Sports Instrument Cluster Gauges. The Top 2 Gauges are the Thermal type and slow to react to environmental changes. Photo by T.

Magnetic Gauges:

The 2 lower Gauges are the Magnetic Type. Current flowing through each Gauge induces a Magnetic Field which causes the Gauge's Needle to deflect.
UC Sports Instrument Cluster Gauges. The bottom 2 Gauges are Magnetic and respond instantly to environmental changes. Click to Enlargen. Photo by T.

Voltage Regulator:

The Cluster uses the TCA700Y-ITT Voltage Regulator IC. Websites show this as being a 10 volt device. Even though the number is the same, those used on Holdens are 8 Volt 220 milliamp devices. This Regulator is used on VB, WB, VC, VH, and UC at least. Previous models used mechanical thermal voltage stabilisers rather than this semiconductor device.The Voltage Regulator is mounted on the alloy frame of the Thermal Gauges as an attempt to provide thermal compensation. 
TCA700Y-ITT Regulator as used on Holdens from UC onwards.. Click to Enlargen. Image by T.
UC Sports Instrument Cluster Printed Circuit Board. The Voltage Regulator is centre right. The Resistor is soldered to the Common Terminal (Ground Leg) of the Regulator at one and and Chassis Ground at the other. Click to Enlargen. Photo by T.
The Voltage Regulator common terminal is screwed to the Alloy Frame of the 2 Thermal Gauges. The Resistor is soldered to the Ground Leg. Click to Enlargen. Photo by T.

Resistor:

The ground Resistor is 10 Ohm 1/4 Watt 5% Tolerance.
UC Sports Instrument Cluster Gauges. Top 2 are Thermal and slow, bottom 2 are Magnetic and instant. Click to Enlargen. Photo by T.
UC Sports Instrument Cluster showing the Thermal Elements of the Fuel and Temperature Gauges. Click to Enlargen. Photo by T.
UC Sports Instrument Cluster showing the Magnetic Elements of the Oil Pressure Gauge and Voltmeter. Click to Enlargen. Photo by T.
UC Sports Instrument Cluster Diagram. Click to Enlargen. Image by T.

Rear Connector:

UC Sports Instrument Cluster Dash Connection Pin Out. Click to Enlargen. Image by T.

Regulator Circuit:

The Regulator has its input connected to the Pink Wire +12 volts direct from the Alternator/Battery. It's output terminal supplies power to both the Thermal Gauges. 
UC Sports Instrument Regulator Circuit. Click to Enlargen. Image by T.

Fuel Gauge Circuit:

The Fuel Gauge gets its supply Voltage from the Regulator. 9 volts when measured to Chassis Ground. 
UC Sports Instrument Fuel Gauge Circuit. Click to Enlargen. Image by T.

Temperature Gauge Circuit:

The Temperature Gauge gets its supply Voltage from the Regulator. 9 volts when measured to Chassis Ground. 
UC Sports Instrument Temperature Gauge Circuit. Click to Enlargen. Image by T.

Oil Pressure Gauge Circuit:

The Oil Pressure Gauge uses unregulated +12 volts direct from the Alternator/Battery via the Pink Wire. 

UC Sports Instrument Oil Pressure Gauge Circuit. Click to Enlargen. Image by T.

Voltmeter:

The Voltmeter uses unregulated +12 volts direct from the Alternator/Battery via the Pink Wire.
UC Sports Instrument Voltmeter Circuit. Click to Enlargen. Image by T.
 
The failed Regulator went short circuit between the Input and Common Legs. As a result the Resistor burnt out. Click to Enlargen. Image by T.

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