aoyue INT 738H Instruction Manual page 19

Multi-function re-working system
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BASIC TROUBLESHOOTING GUIDE
PROBLEM 7: AIR PRESSURE LEVEL IS SIGNIFICANTLY LOW NO
MATTER HOW HIGH THE AIRFLOW LEVEL IS CALIBRATED
Case 1: Check the mains voltage (AC power source). If the voltage level falls
significantly low, about 15-20% lower than the standard, there will also be a
noticeable drop in the air pressure level.
SOLUTION: Please refer to your local power service provider.
Case 2: The microcontroller might have detected the operating frequency
incorrectly. The user will notice that airflow level is weaker with reference to the
airflow gauge compared with the displayed value.
SOLUTION: Turn off the unit and on again to let the device re-detect the
proper operating frequency.
Case 3: The Suction Vacuum cap is connected to the Smoke Absorber
Terminal or Vacuum cap instead of the Wire mesh cap.
SOLUTION: Change the cap to the Wire mesh cap. This allows more air to
pass through the system. Make sure as well that the vacuum tube of the
soldering iron or desoldering gun is not connected.
Case 4: The Wire mesh cap is connected but airflow level is still low.
SOLUTION: Check the filter pad inside for dirt that can block the air passage.
Clean or replace if necessary.
ADDITIONAL SOLUTION:
PROBLEM 8: UNIT SHOWS UNCONVENTIONAL BEHAVIOR
Description: Unit operates erratically.
SOLUTION1: Try to switch OFF the device and switch ON again. Unplug the
system from the main power source and plug in again when necessary
SOLUTION2: Restore unit to default factory setting. switch OFF/ON the unit
while holding the hot-air temperature down button until the banner finishes
scrolling, the unit would revert to its default factory setting.
OTHER PROBLEMS NOT MENTIONED:
Contact the vendor.
Check for any tangles in the tube of the hot air
gun that can cause the air blockage.
19

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