Weller MT1500L User Manual
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TIP CALIBRATION
The MT1500LL is calibrated at the factory using the MT320 Calibration Tip. To calibrate a specific tip for a certain temperature, insert the desired
temperature Key into the panel socket and then measure the actual tip temperature. Adjust R57 (see below for location) to raise or lower the tip
temperature to match the temperature printed on the key.
STATION CALIBRATION
WARNING:
HIGH VOLTAGES ARE LOCATED INSIDE THIS UNIT. SERVICE SHOULD BE PERFORMED BY QUALIFIED TECHNICIANS ONLY.
The MT1500LL is calibrated at the factory using the MT320 Calibration Tip. The following procedure will allow full calibration of the MT1500LL unit
for different series tips.
Tools needed: WA2000 Soldering Iron Analyzer (Recommended) to read tip temperature from the calibration tip, Digital Voltmeter (DVM), Phillips
screwdriver, small 1/16" wide blade screwdriver to adjust trimmer pots.
1.
Remove power cord from rear receptacle. Remove six (6) screws holding cover on station. Remove cover. Use drawing at right to
locate adjustment pots. used for the procedure. Plug power cord back in.
2.
Temperature measurements are done using a calibration tip from the same tip series as the tips you are using. If you are usin g the
MT200 Series Microtips use the MT220 calibration tip. For any of the MT300 Series Minitips use the MT320 calibration tip. For any of the
MT600 Series Macrotips use the MT620 calibration tip.
3.
Set the front switch to Continuous Mode and remove any temperature key for minimum temperature setting. Turn station on.
4.
Adjust trim pot R57 slowly until the tip temperature is steady at 400°F ± 2° (204°C ± 1°). R57 is located on the lower left side of the
angled front panel and is accessed through a small hole.
5.
Insert the 800°F temperature key and adjust trim pot R56 until tip temperature is steady at 800°F ± 2° (427°C ± 1°).
6.
MT200 Series tip operation is sensitive to the power line frequency. To calibrate station for 50 Hz or 60 Hz operation, replace
MT320calibration tip with a MT200 series tip. Set DVM to read DC volts. Connect DVM test leads to + or - test holes on the back of the
circuit board. (See drawing at right for location). For operation at 60 Hz, adjust trim pot R55 so that the voltage across the two test
points is 7.10 volts DC. For operation at 50 Hz set voltage to 6.70 volts DC.
7.
MT200 series ungrounded tips. Set DVM to measure AC volts. Connect negative lead to DVM to measure AC volts. Connect negative lead
of DVM to green lead at ring terminal (case ground) and the other lead with an alligator clip to the tip. Insert 800°F temperature key.
Adjust trim pot. R32 for minimum voltage (less than 50mVAC).
8.
Turn station Off. Unplug power cord. Place cover back on base. Line up front holes with screw threads and install front two
(2)screws. Push cover toward back of unit to line up rear two holes. Install remaining four (4) screws. Plug power cord back in .
TRIP POT. LOCATIONS AND TEST POINT HOLES ON CIRCUIT BOARD AS VIEWED FROM BACK OF CASE