Weller WQB2000 - Manual (Page 4)

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6. Turn on the WQB-P power supply. Check the WQB-C Timer to verify that the LED’s are lighted. If not, turn off WQB-P power supply and
check connectors for correct insertion into receptacles. See MACHINE SET-UP; section 4, 5 and 6. CAUTION: ALWAYS TURN WQB-P
POWER SUPPLY ON BEFORE TURNING ON THE WQB-A POWER SUPPLY. CONVERSELY, TURN OFF THE WQB-A POWER SUPPLY
BEFORE TURNING OFF THE WQB-P POWER SUPPLY. The hot air power is controlled by the WQB-P power supply. If the
WQB-A is “ON” and the WQB-P is “OFF” the hot air heater will be “ON” and could overheat and possibly burn out if left on
for an extended period.
Place the Read-Set slide switch to Set. Turn the temperature adjustment knob to the minimum setting, the temperature display should be
on and the set temperature value should change as you turn the knob. Place the Set-Read slide switch to the Read position, if the
display reads “EEE” the heater plug may not be connected correctly, check polarity and re-seat, if the display still reads “EEE”, the i
nternal heater sensor is open and the heater will need to be replaced.
7. Turn on the WQB-A power supply. The green heater on indictor LED may flash and then should stay off. Set the temperature control to
the minimum setting and set the air flow control to 5.
8. Press the PROGRAM button on the WQB-C timer once, the display will flash, then use the up or down arrow buttons to change the
program to P03. Allow the display to stop flashing. Press the PARAMETER SELECT button to cycle through the parameter settings
stored in memory for this program, note that the green LED lights will indicate which parameter is being viewed. Each press of the
PARAMETER SELECT button will advance the timer program to the next parameter. Select the parameter (1) WHP 300 (WQB-P)
TEMPERATURE, set the value with up or down button to 100°F. Set remaining parameters as follows:
(2) WQB-A TEMPERATURE to 100°F.
(3) WQB-A AIR FLOW to 5
(4) Time 1 PREHEAT 1 to 15
(5) Time 2 PREHEAT 2 to 10
(6) Time 3 REFLOW to 5
Press and hold down the PROGRAM button until the display stops flashing, this stores the parameters into memory. If the parameters are not
stored in memory the settings will be lost if another program is selected or the timer is powered off.
Press the DESOLDERING button once. The red LED above the DESOLDERING button should light and the component lift stem in the nozzle should
extend. Press the DESOLDERING button again and the stem should retract. Press the DESOLDERING button again to extend the component lift
stem and remove the nozzle. Press the VAC button once, the red LED above the VAC button should light and vacuum should be present at the
vacuum cup, test by placing finger over opening in cup. If no vacuum is present, check connections and be sure WQB-A is turned on.
Replace nozzle, be sure that vacuum cup extends past nozzle air deflection plate. Press the VAC button once, vacuum should no longer be
present and the VAC LED should be off. Press the DESOLDERING button once, the stem should retract and the red LED above the DESOLDERING
button should be off. Check to see that the vacuum cup is up against the nozzle air deflection plate and not jammed in the plate hole.
Press the COOLING button once, cooling air should start to flow through the nozzle and the red LED above the COOLING button should be on.
Press the COOLING button again and the air flow should stop.
TESTING THE SYSTEM - SOLDERING
Press the start button once, the Time 1 green LED should light, the heater plate should start to warm, and the hot air flow should become warm.
The display will indicate the time remaining for this segment of the cycle and will count down to zero. An audible beep will be heard and air flow
will stop to indicate that the nozzle should be lowered to the circuit board (not necessary for this test).
After a slight delay to allow for nozzle lowering, the second preheat cycle will begin and air flow will resume but at a lower flow rate(not
adjustable), also indicated by the Time 2 green LED coming on. The timer will count down to zero; the Time 2 Green LED light will turn off.
The finial re-flow heating stage will start immediately indicated by the Time 3 green LED and a higher air flow rate. The display will indicate the time
remaining for this segment of the cycle and will count down to zero, at zero time the Time 3 green LED will turn off.
The cooling cycle will start at the end of the re-flow segment, the red cooling LED will light and the cooling air flow will start indicated by a higher
air flow rate. The cooling time is preprogrammed at 60 seconds; it can be changed but not stored in memory. It can be adjusted up or down by
holding the COOLING button down while pressing the up or down buttons. Any change in cooling time will revert to 60 seconds when the power
is removed from the WQB-P. We recommend a full 60-second cooling cycle. At the end of the cooling cycle another audible beep will be heard
indicating that the soldering cycle is complete, at this point the nozzle would be raised and the circuit board removed from the machine platform.
TESTING THE SYSTEM - DESOLDERING
Press the desoldering button once to start the desoldering cycle. The component vacuum lift stem will extend and the red LED above the
DESOLDERING button will turn on. The desoldering cycle will exactly follow the same cycle sequence as during soldering until the finish of the
reflow segment.
After the reflow segment is complete the WQB-C delays the cooling segment start until the component vacuum is activated, (indicated by the red
VAC light turning on) and then the removal of the component by the vacuum cup and lift stem (the red DESOLDERING LED light turns off). The
cooling segment starts, indicated by the red COOLING LED turning on. Cooling will continue until the timer reaches zero, the cooling air will stop
and an audible beep will be heard indicating that the desoldering cycle is complete, at this point the nozzle would be raised and the circuit board
removed from the machine platform.
The desoldered component will be held in the nozzle until the VAC button is pressed. To retrieve the component from the nozzle without damaging
fine leads on QFP’s, place a paper tablet against the under side of the nozzle and then press the VAC button. This removes the vacuum from the
vacuum cup and the component will drop onto the paper tablet without damage.