YIHUA 948DII User manual

Thank you for choosing this Intelligent rework station, this product is specially designed
for lead-free soldering station, please read the instructions carefully before use, after
reading please keep for future reference.
INSTRUCTION MANUAL
Statement: The company reserves the right to improve and upgrade products,
product specifications and design are subject to change without notice.
English
948DII
3 in 1 Anti-static
Desoldering Station

1
I. Features
1. Adopts PID programmable temperature control technology with an implant able
highest-precision PID program for high-speed tracking and detection of actual
desoldering gun and soldering iron temperatures with real-time temperature
correction. Miraculous temperature compensation speeds allow for minimal
temperature error for temperature stability and compensation speeds.
2. Featuring desoldering station and high-frequency soldering station functions,
the machine intelligently identifies and switches between the two functions.
When ready to use the high-frequency soldering station, unplug the desoldering
station handle and connect the high-frequency station handle. The machine will
intelligently identify the function and read out the high-frequency soldering
station’s previous temperature parameters. If you need to change back to the
desoldering station, unplug the high-frequency soldering station handle and
connect the desoldering station handle. The machine will automatically identify
the desoldering station temperature parameters.
3. Provided with soldering iron for wider range desoldering and it can work with
desoldering station at the same time.
4. Anti-static design, preventing components from damage due to static and
leakage.
5. Adopts an isolation transformer for power supply to heating elements and
automatic shutoff functionality when the high-frequency soldering iron handle
or desoldering gun handle is removed for safety and reliability.
6. Portable built-in vacuum with strong suction does away with external vacuum
systems.
7. This device has the following user-friendly design features.
A. Celsius/Fahrenheit Temperature Display
Designed to meet the market needs of different regions, the temperature
display function can be set to display either Celsius or Fahrenheit, depending
on local practices.
B. Sleep Function
Soldering iron automatic detection of their work status are not in use in a
quiescent state, arriving to set the sleep time, the temperature of the iron
automatically lower the temperature to 200 ° C enter into sleep state, can
effectively prevent the oxidation of iron head and prolong the iron tip service
life, energy saving and environmental protection. The sleep time can be set
range: 1 to 99 minutes in 1 minute steps, users can be set based on usage, if
you do not need a soldering iron sleep ,the sleep time is set to---.
Wake/Sleep Mode:
a. Shake soldering handle up and down several times or flick the red switch on
the suction gun once.
b. Press any one button.
c. Turn off the power switch then turn on the power switch.
C. Automatic Shutdown Function
After machine enter into sleep state, start the timer program, set the shutdown
time did not wake up from sleep, automatic shutdown, energy saving and
environmental protection. Auto power off time setting range: 1 to 99 minutes in
1 minute steps, if you do not need a auto shutdown function ,the power off time
is set to---.
D. Password Feature
A password must be given to enter the function parameter settings. Function
parameters can only be changed after the correct password has been entered,
thus preventing operator changes and any impact on operational efficiency.
2
1. If the power cable is damaged, it must be replaced by the manufacturer or by a
maintenance department professional in order to avoid danger.
2. This tool must be placed in its stand when not in use.
3. Be careful when using this device in the vicinity of flammable materials; Never
use this device for extended periods in the same location.
4. Be aware that heat may be transferred to distant flammable materials;
Someone must be present at all times while the device is connected.
5. This device is not intended to by operated by individuals with diminished
physical, sensory, or mental capacities or by those who lack experience (such
as children), except in the presence of individuals qualified to provide
necessary supervision and guidance; Ensure that children do not play with this
device.
WARNING
To use this product, the following basic measures should be strictly followed to
avoid hazards of electric shock, bodily injury, fire and other phenomenon.
1. In order to ensure safety, please turn off the power switch when not in use.
When not in use for an extended period, please unplug the power cord!!!
2. Serious consequences may result if non-original or non-approved parts are
used.
3. In the event of product failure, repairs must be carried out by professionals or
manufacturer-designated personnel.
4. This product uses three-wire grounded plug must be inserted into three-hole
grounded outlet, do not change the plug or use an ungrounded three-headed
adapter leaving poor grounding.
5. After the desoldering station is switched on, its temperature can exceed 400
degrees centigrade. Do not use near flammable or explosive objects. To avoid
burns, do not touch the metal part of the soldering iron.
6. Do not leave the work area when the soldering station is switched on.
7. The power cord must be unplugged and the iron must be allowed to cool before
installing or replacing soldering iron parts.
8. After used, remember that cooling the unit before installation.
9. The desoldering station should only be used for soldering. Do not hit the
desoldering gun station against the work surface to remove flux residues, as
doing so may seriously damage the soldering iron.
10. Soldering produces fumes, ensure there is adequate ventilation.
Safety Guidelines

E. Digital Temperature Correction Feature
Suitable for temperature deviations between actual temperatures and
displayed temperatures due to environmental conditions or the replacement of
heating cores, iron tips, or other parts which can be corrected with this feature.
8. With a unique tin suction nozzle and heating pipe design, solder can be inhaled
through filters in a molten state without the need for regular maintenance,
thereby delivering greater efficiency.
9. Adopts silicone heat-resistant tubing to prevent heat generation and contact
damage.
10. The double-sided internal SMT manufacturing process boasts clean
craftsmanship. The signal flow is clear, and the machine is both stable and
safe, further improving its performance and adaptability to various harsh
environments.
3 4
III. Panel, Desoldering Station Handle Sketch Map
ON
OFF
POWER
VACUUM
1
2
3
+
*
-
1
2
3
+
*
-
1 2 3
1 2 3
948D
SUC TION TI N GUN SOL DERIN G STATION
SOL DERIN G STATIONSUC TION TI N GUN POWER
HIGH FREQUENCY SUCTION TIN GUN&SOLDERING STATION
123456
7
8
9
10
11
12
13 14
15
16
17
18
1. 3 Storage of soldering station
2. Display for soldering Iron temperature
3. Display for desoldering/ high frequency soldering station temperature
4. 3 Storage function indication light of desoldering station/high frequency
soldering station
5. Model
6. Desoldering/ high frequency soldering 3 stage storage function
7. Desoldering/ high frequency soldering station increase function
8. Desoldering/ high frequency soldering station function button
9. Desoldering/ high frequency soldering station decrease button
10. 3 Storage indication light of soldering iron
11. Interface for desoldering station/high frequency handle(7 Core Socket)
12. Air pipe interface
13. Switch for desoldering station/ high frequency soldering station
14. Soldering iron switch
15. Interface for soldering iron handle (6 core socket)
16. Soldering Iron decrease button
17. Soldering iron function key
18. Soldering iron increase button
190W
130W
90W
60W
200 ~480°C °C
LED digital tube
±1°C (static state)
AC 36V ±10% f= 380KHz
AC 26V ±10%
12W
350 ~480°C °C
0.05MPa
<2Ω
L250xW186xH134mm ±5mm
Power
Desoldering station Power
High Frequency Soldering Station Power
Soldering Iron Power
High Frequency Soldering Station/
soldering iron temperature Range
Soldering Iron Temperature Range
Display Mode
Temperature Stability
Voltage of High Frequency Heating Wire
Voltage of Soldering Iron Heating Element
Desoldering Pump Power
Vacuum Pressure
Tip of Ground Impedance
Packaging Detail
II. Specifications
Weight
Handle Length
Operating Temperature
Storage Temperature
Storage Humidity
6.1kg
≥120cm
0 40 F°C~ °C/32° ~104°F
-20°C~80°C/-4° °FF~176
35%~45%
Power supply voltage AC 110V ±10%60Hz/
AC 220V~240V 50Hz

1234
5
6
7
8
9
10
11
1. Suction tips, wearing parts
2. Steel tube
3. Nut
4. Filter and built-in spring filter tube are
wearing parts
5. Back holder assembly
6. Release button
7. Indicator
8. Housing cover
9. Air pipe
10. Desoldering gun handle cord
11. Desoldering station switch
IV. Operation Instruction
1. Attach the High frequency iron handle, desoldering gun or soldering iron handle.
2. Connect to the power supply.
3. Turn on the main power switch. The desoldering station or soldering iron will
begin heating.
4. Press the plus and minus keys to set the desired temperature. Once the High
frequency station and soldering iron reaches a constant temperature, work
may begin. The desoldering gun can only begin desoldering three minutes after
the power switch has been turned: use the desoldering gun nozzle at the foot of
the element. Completely melt solder on the element foot. Press the red switch
on the desoldering gun to remove solder.
5. When finished, return the soldering iron handle or desoldering gun handle to the
holder and turn off the power.
Caution:
1. Desoldering gun and High frequency soldering iron handles share the same
interface. When using the desoldering station, the desoldering station handle
connect to 7-core aviation plug, and connect the air pipe to the suction pen
interface. When using the High frequency soldering iron, disconnect the
desoldering gun and connect the High frequency soldering iron handle.
2. When using the desoldering station, please pay attention to the following points:
A. The red switch on the desoldering gun may only be flicked after solder has
completely melted.
56
B. If there is residual solder within printed circuit board apertures, the circuit
board must be soldered and de-soldered anew.
C. If the element foot rests on the printed circuit board aperture such that
solder cannot be suctioned cleanly, first re-weld and then use the suction
nozzle for melted solder. Then, slowly move the suction nozzle, moving the
element foot so that the element foot is not in contact with the aperture. Then
press the red switch on the desoldering gun to clean the solder.
D. When the desoldering nozzle is not blocked, press the red switch on the
suction gun and observe the indicator color. If the color is red or at least 50%
red, the suction nozzle and filter pipe need cleaning. If the color is blue or light
red, no cleaning is necessary.
E. The nozzle has different sizes: φ0.8MM,φ1.0MM, φ1.2MM, φ1.6MM,
φ1.8MM, φ2.0MM, the big nozzle suitable for soldering large component foot ,
the small nozzle suitable for soldering small components foot, please select
the suitable nozzle to work.
V. Function Parameter Settings
Press the key to toggle the function setting
Digital Temperature Calibration
Sleep Setting
Auto Shutdown Function
Celsius/Fahrenheit Conversion
Change Password
The method for setting soldering iron parameters is the same as the method for
setting desoldering station / high frequency soldering station parameters. For
details, see setting desoldering station / high frequency setting parameters.
Desoldring station handle sketch map

VI. Parameter Settings
A. Digital Temperature Calibration
1. Turn on the power switch, press the button for 1 time, the display shows “
PASS ----”, the first “ - ”flash. Shown as Figure 1.
2. Press the desoldering station increase and decrease button to input the first
password then press the button for transposing, and repeat the process
above until finishing 4 password then press the * button and display shows
CAL-, “ - '' flashing. Shown as Figure 2.
3. Press the desoldering station increase and decrease button display screen
shows”XXX”and “XXX” is the 3 bit value changing from bigger to smaller, is
showed. The display shows “---C ” and the hundreds digit“ - ” flashes when 000
is indicated. Shown as Figure 3.
SUC TION TI N GUN SOL DERIN G STATION SUC TION TI N GUN SOL DERIN G STATION S UCTIO N TIN GUN SOL DERIN G STATION
Figure 1 Figure 2 Figure 3
4. Test the desoldering nozzle temperature with 191 or other similar thermoscope,
press the up and down button to input the testing temperature and then press
the button for automatic correction of temperature. 3 minutes later, testing
the desoldering nozzle temperature is exist deviation or not, if the measured
temperature is exist deviation, repeat the process until measured temperature
is 300°C and then press the button to confirm and exit temperature calibration,
the display shows CAL-.
5. Press button to select and set up other functions if you need. If not, stopping
operation for 6 seconds, program automatic save, confirm and exit function
setting interface. Digital temperature calibration is finished.
Caution for Testing Desoldering Nozzle Temperature:
1. Please do not use circular sensor probe to test the desoldering nozzle
temperature because the round probe fails to fully to contact the
desoldering nozzle and the measured temperature is not correct.
2. The non-stick oxide desoldering nozzle cannot perform digital
temperature correction.
3. Please test the temperature in the environment with less air flow.
4. Please solder the desoldering nozzle first for more accurate measured
temperature when testing the temperature with the thermoscope.
5. Please set the sleeping time to 20 minutes or more to prevent the
machine enter dormancy for the temperature calibration success.
6. Please measure temperature 3 to 5 minutes later after setting a new
temperature to ensure the accuracy of testing temperature.
78
SUC TION TI N GUN SOL DERIN G STATION
B. Sleeping Time Settings
1. Turn on the power and press the button for 1 time and then press the button
for 2 times after inputting password. The display shows “ L-- '' and the “ -- ”
flashes. Shown as Figure 4.
2. Press button to select and set up other functions if you need. If not, sleeping
time settings is finished after stopping operation for 6 seconds.
SUC TION TI N GUN SOL DERIN G STATION
Figure 4
C. Auto Shutdown Time Settings
1. Turn on the power and press the button for 1 time and then press the button
for 3 times after inputting password. The display shows “ P01 ” and the “ 01 ”
flashes. Shown as Figure 5.
2. Press the desoldering station increase and decrease button to set the shutdown
time you need, click for 1 minute change , long press for quick settings
3. Press button to select and set up other functions if you need. If not, auto
shutdown time settings is finished after stopping operation for 6 seconds.
D. Celsius/Fahrenheit Temperature Display Settings
1. Turn on the power and press the button for 1 time and then press the button
for 4 times after inputting password. The display shows “ C ” and the “ C ”
flashes. Shown as Figure 6.
2. Press the desoldering station increase and decrease button to set Celsius/
Fahrenheit temperature display mode.
3. Press button to select and set up other functions if you need. If not, Celsius/
Fahrenheit temperature display mode settings is finished after stopping
operation for 6 seconds.
Figure 5
SUC TION TI N GUN SOL DERIN G STATION
Figure 6

E. Password Change Settings
1. Turn on the power and press the button for 1 time and then press the button
for 5 times after inputting password. The display shows “ PRE- ” and the “ - ”
flashes. Shown as Figure 7.
2. Press the desoldering station increase and decrease button to input the first
password then press the button for transposing, and repeat the process
above until finishing 4 password for the first time. Shown as Figure 8. Press the
button to repeat the process and input the password as the first time. If the
password input is not the same, please refresh the password and input the new
password and then select the same password for the last two times.
3. Press button for 2 times to select and set up other functions if you need. If not,
password change settings is finished after stopping operation for 6 seconds.
4. As for soldering iron parameter settings, please take desoldering station /high-
frequency soldering station parameter settings for reference.
SUC TION TI N GUN SOL DERIN G STATION
SUC TION TI N GUN SOL DERIN G STATION
Figure 7
Figure 7
910
VII. Soldering Tip Maintenance and Use
Soldering Tip Temperature
If the soldering temperature is too high, it will diminish the functionality of the
soldering tip. Therefore, choose the lowest possible temperature. This soldering
tip features outstanding temperature resilience with the capacity for rechargeable
solder at lower temperatures to protect temperature sensitive components.
Cleaning
The soldering tip should be regularly cleaned with a cleaning sponge. After
soldering, carbon compounds and oxides derived from the soldering tip's residual
solder will damage the soldering tip, causing soldering errors or a drop in
soldering tip thermal conductivity. When the soldering iron is used continuously
for long periods of time, the soldering tip should be dismantled once a week to
remove oxides. To prevent soldering tip damage, reduce the temperature.
When Not in Use
When the soldering iron is not in use, the soldering iron cannot remain in a high-
temperature state for long periods of time; otherwise, solder on the soldering tip
will convert to oxide, greatly diminishing the thermal conductivity of the soldering
tip.
After Use
Following use of the soldering iron, the soldering tip should be wiped clean and
coated with a new layer of tin to prevent soldering tip oxidation.
1. When the soldering iron is initially used, pay attention and check for
temperature rises on the soldering iron tip. Wait until the temperature is just hot
enough to melt the solder tip, coat the soldering iron tip with a layer of tin and
then increase the temperature to the desired temperature. Remember when
working that the soldering iron tip should have been coated with a layer of tin for
a long period of time to protect the soldering iron tip and thus be able to achieve
optimal soldering functionality.
2. If a layer of oxide appears on the surface of the soldering iron, thus making it
seem like the soldering tip is at such a low temperature that it cannot melt tin or
be coated with tin, both the heating core and the soldering iron will in fact be
extremely hot at this time. When this happens, do not blindly raise the
temperature. Instead, use a cleaning sponge to wipe away the oxide. If the
oxide does not come off, wait until the soldering iron temperature falls back
down to room temperature, then use sandpaper to carefully remove the oxide.
Afterwards, follow the initial steps in point 1 above for the use of the soldering
iron.
3. Note that after the soldering iron is used for high temperature work, when it is
returned inactive to the iron holder, the temperature knob should be turned to
250°C or below. When inactive for over 20 minutes, please turn off the power.
Otherwise, if the soldering iron rests at a high temperature for a long period of
time, accumulative heat will be generated between the soldering iron and its
holder, thus accelerating the ageing process of the heating core. In this state,
the soldering nozzle will derive oxide, directly diminishing soldering

functionality. When severe, it may even melt the connecting coupling nut or
short-circuit the heating core.
4. Do not cull oxide from the soldering tip with a file. If the soldering tip is
deformed or rusts, it must be replaced.
5. When soldering, do not apply excessive pressure to the soldering tip. While
excessive pressure will not change its thermal conductivity, it will damage the
soldering tip.
VIII. Desoldering Station Maintenance
and Component Replacement
1. Cleaning and maintenance are the same for both the high-frequency soldering
station soldering tip and the desoldering gun nozzle. Sucker, Heating Element
and Filter Tube Cleaning.
2. Nozzle, Heating Element, and Filter Pipe Cleaning.
A. Nozzle cleaning
* Insert the plug into the power outlet. Turn on the power switch to heat the nozzle.
* Select an appropriate nozzle cleaning needle to clean the nozzle hole.
B. Heating element cleaning
* Unscrew the nut after the heating element has cooled. Remove the steel pipe
and nozzle.
* Turn on the power switch to heat the heating element. Use an appropriate
cleaning needle to clean the heating element holes.
* The power must be turned off after cleaning.
Caution:
Solder in the heating element holes can only be cleaned after it is melted. If the
cleaning needle cannot penetrate the heating element holes, replace the heating
element. When assembling, the nut must be screwed on tightly. Otherwise, the
nozzle temperatures will be low.
Heating element Nozzle Heat Generator
Steel Pipe Nut Heating element
11 12
C. Filter Tube Cleaning
1) Turn off the power. Wait until the filter has cooled. Remove the filter according
to the picture below.
2) Remove the filter and put out the spring filter tube to clean the solder in the
spring filter as shown below.
Caution: Be careful as the filter tube is very hot.
A. Pull down
B. Pops out on its own
C. Replace filter pipe
Front cover Spring filter tube Ceramic fiber filters
Components in the filter need to be replaced when the following phenomenon
happens.
* Replace the spring filter tube when soldering tin can not be removed or stored 2/3
solder in the spring filter tube.
* Replace the asbestos filter when it gets stiff, silting up too much solder and flux.
3. Heating Component Replacement
① Unplug the power cord and cool down the heating component.
② Screw out the nut and remove the steel tube and sucker.
③ Remove the fixed screw in the heating component.
④ Take out the filter.
⑤ Screw out protective screw and open the cabin.
⑥ Unplug the heating element connection and remove the heating component
⑦ Install a new heating component.
⑧ Connect the connection as follow as the original wiring method
⑨ Assemble the desoldering gun in reverse order and re adjust the temperature.

13 14
Release fixing screws of the
heating components
Release nuts, remove the
pipe and the suction nozzle
Nuts
Heater pipe
Nozzle
Heating element
Remove the filter
Guard cabin
Release cabin retaining screws,
open cabin guard
Heating element
Unplug the heating element connection,
remove the heating element
1
3
5
6
7
2
4
1. Machine case
2. Bottom case
3. Front panel
4. PCB board
5. Transformer
6. Pump
7. Power socket