ENGINE AR-PRIMARY 4155551 - Caterpillar

This Special Instruction gives troubleshooting and repair information for the 5P2160 Engine Horsepower Meter Arrangement. The major topics are: I. General Troubleshooting and Repair of The Engine Horsepower Meter and AccessoriesII. Electronic Troubleshooting and Repair of The Engine Horsepower MeterFor information on how to use the Engine Horsepower Meter, see Special Instruction Form GEG02402, "Using The 5P2160 Engine Horsepower Meter Arrangement". For information on correction factors and reference material to be used with the Engine Horsepower Meter, see Special Instruction Form SEHS6947, "Reference Material and Correction Factors For Use With The 5P2160 Engine Horsepower Meter Arrangement".General Troubleshooting And Repair Of The Engine Horsepower Meter And Accessories
General Troubleshooting Procedure
The following section gives a general procedure for isolating a faulty portion of the entire Engine Horsepower Meter Arrangement. It is written to enable a person with reasonable knowledge of electricity and a multimeter to find simple faults which are field repairable, without taking the unit to an electronics repair facility or returning it to the manufacturer.If the following procedure does not isolate the problem, U.S. dealers should return the unit (Horsepower Meter or flowmeter only) to the appropriate address shown on page 49. Dealers outside the U.S. may wish to have the unit further inspected and repaired locally by a qualified electronics shop which is familiar with digital circuitry.The material on pages 20-23 and pages 26-48 is intended only for those situations where it is not practical to return the unit to the U.S. for repair. U.S. dealers are urged to send their units to Fluidyne Instrumentation where repairs and calibration can be performed more precisely and efficiently. Be sure to check out the components by using the following procedure in the order indicated. Do not omit any tests unless the unit is known to operate correctly in that specific mode.
Do not use a continuity light to trace circuits on either printed circuit board. Some semiconductor components can be damaged if 3 volts is connected across them.
1. Turn the POWER switch to ON (Be sure the knob has not slipped on the shaft).2. Do any of the display lights light? a) YES - Go to Step 3.b) NO - Open the Horsepower Meter and perform the steps shown on page 6. If the problem cannot be identified as a blown fuse, bad switch contact, broken wire, loose battery connection, dead batteries, etc., return the unit to Fluidyne Instrumentation (see page 49). If the problem is known to be in the power board, return only the power board to Fluidyne.3. Are the display lights dim? a) NO - Go to Step 4.b) YES - Check for a voltage at the batteries of greater than 5.2 volts. If the voltage is less, recharge the batteries to over 6 volts and recheck. (If the batteries won't charge, go to Step 15.) Check for voltage losses between the batteries and wiring point 16 and the displays. The voltage should be greater than 5 volts at wiring point 16.4. Do any of the lights have