General Technologies TA300 SmarTach D : Digital Diesel Engine Tachometer - Manual (Page 6)

4.2.3 Weak signal due to the characteristics fuel line or fuel injection pump
There are many factors that may contribute to the piezoelectric sensor in not being able
to generate a signal (pulse) strong enough for the TA300 to detect. These situations may
cause low, slow or inconsistent built up of fuel pressure in the fuel line. Some common
causes are listed below:
• Leaky, dirty or damaged fuel injectors.
• Damaged fuel pump.
• Very low cylinder pressure.
• Presence of air in the fuel line.
Possible solutions:
• Change the position of the piezoelectric sensor in the fuel line.
• Place of the piezoelectric sensor to a different fuel line.
• Change the signal sensitivity of the TA300 using the Sensitivity Adjust function (refer
to section ‘3.5.2 Sensitivity Adjust function’ for detailed instructions) until a reading is
obtained. If the RPM readings are erroneous or unstable proceed to adjust the trigger
level (refer to section ‘3.5.3 Trigger Level Adjust function’ for detailed instructions)
until a stable RPM is obtained..
5. MAINTENANCE
5.1 Battery replacement
5.2 Cleaning
Keep the instrument in its carrying case when not in use and do not subject it to dampness
or severe heat or cold. Do not use the instrument in the rain, if it should accidentally get
wet, dry it off with a clean paper towel before storing it away.
Protect the unit from contact with any solvents. Never clean with a solvent or petroleum
based medium such as gasoline, as these chemicals may attack the plastic parts and
cause permanent damage. Never use an abrasive cleaner. Cleaning should be limited to
wiping with a clean damp paper towel and a small amount of soap if required. Dry the unit
thoroughly after any cleaning.
The unit is a sealed instrument and contains no user serviceable parts other than the bat-
tery, which can be replaced by opening the drawer on the back of the unit. Opening other
parts of the unit will void the warranty.
6. WARRANTY
With the exception of the battery, this instrument is warranted against defects of material or
workmanship which develop within a period of one (1) year following the date of purchase
by the original owner. For details see Standard Warranty Information on our web page at
www.gtc.ca or you may request a printed copy.
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Fig 5 - Battery replacement
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1- Release the rubber holster from plastic enclosure by pulling from the bottom of the
holster as shown in the illustration (Fig. 5)
2- Push the rubber holster forward until the battery compartment cover is exposed
3- Slide open battery cover located at the back of the unit.
4- Connect the new battery observing the polarity of the battery connectors.
5- Replace battery cover and rubber holster.
4- Press the Power On/Off / Reset button on the TA300 until the display turns on. If the
display does not turn on, check the battery polarity and reinstall if necessary.
5-To turn the unit off, press and hold the Power On/Off / Reset button again the
displays turn off.