Vinotemp VT-DS300SS-2Z User manual

Service Manual for VT-DS300SS-2Z and VT-DS300SS-2Z-L
This wine cooler should be serviced by a qualified technician.
Be sure to have the unit unplugged while repairing the unit.
Tools Required:
1. Tool for Electrical Apparatus Troubles: multi-meter, split-core type meter, power meter, Philips
screwdriver, long flat nose pliers, vice, power board, control board, etc.
2. Tool for Cooling Troubles: suds, brush, R134a gas, nitrogen, oxygen/acetylene soldering set,
oxygen, acetylene, ø6X0.7copper tube, ø4X0.7copper tube, silver-copper brazing alloy, scaling
powder, etc.
Troubleshooting & Maintenance:
I. Troubleshooting for Electric Control:
1. Unworking Display. Display does not appear to be working, Display does not appear
to be working after the appliance is turned on.
(1) Please refer to the clearance procedures below:
No display in the control panel.
Check if the electricity is available in the socket. →No. →Repair the socket.
Yes. →Open the terminal box lid of the medium air duct pane.
Yes. →Check if the wires of terminals are connected rightly.
Loose →Connect the terminals rightly or change it. →Inspect it with power-on. → OK. →
Trouble clearing. → Still not normal.
OK. → Change with a normal control panel.
Inspect it with power-on →OK. →Change the control panel. → Inspect it with power-on. → OK.
→ Trouble clearing. → Still not normal.
Not normal. → Change the PC board.
Inspect it with power-on. →OK. →Change the PC board. → Inspect it with power-on. → OK.
→ Trouble clearing. → Still not normal.
Not normal. → Change the PC board and the control panel.
Inspect it with power-on. →OK. →Change the PC board and the control panel. → Inspect it
with power-on. →OK. → Trouble clearing. → Still not normal.
Not normal. → Check if each 7P terminal is short circuit or open circuit.
Repair 7P terminals.
Inspect it with power-on. → OK. → Trouble clearing. → Still not normal.

（2）Disassembly inspection for the median air duct panel
1. Remove the two shelves on top of the median air duct panel
2. Remove the connecting line box cover by removing the screw from the left side with a
Philips screwdriver. Check the connecting line box cover.
3. Check the connecting line of 7P terminal if loose or broken. Connect with the control panel.
Check the 7P terminal. Connect with PC board.
4. Check whether the control panel is faulty by replacing it with another new control panel. If
the display is working normally, then the old control panel is faulty. New control panel.

（3）Replace control panel
1. Disconnect all the line terminals inside the connecting line box of the median air duct panel.
2. Remove the underneath screws which are fixing the median air duct panel. (6 pcs screws)
3. Pull out the median air duct panel

4. Remove the screws from the bottom of the median air duct panel with a Philips screwdriver.
5. Divide the upper and lower of the median air duct panels. Be sure to observe the position of
the wires. After replacing the control panel, fix the wires by aluminum-foil paper in the original
position.
6. Remove the screws (3 pcs) which are fixing the control panel with a Philips screwdriver.

7. Loosen the control panel, remove the screws (5 pcs) with a Philips screwdriver. Keep the
small hose sideward.
After maintenance, install the median air duct component as the opposite disassembling
procedures.
(4) Replace the power board (Power board is inside of the compressor cabin)
1. Remove the fixing screws (2 pcs) of the power board with a Philips screwdriver.
2. Remove the power board box by hand.

Power board box, 7P terminal, the output of heater, the input of power, public input of power,
the fixing screws of power board, output of compressor and condensation fan.
2. Display not working or other display fault, replace the control panel as with the same
disassembling method, check if it solves the fault after assembling.
3. Unworking Compressor: if the temperature of the inside is higher than the setting
temperature 3℃ above, the compressor does not appear to be working.
(1) Please refer to the clearance procedures below:
Unworking compressor.
Check the control display if working. → No. →Inspection procedure as no display
troubleshooting.
Yes. → Check the compressor power supply. → Yes. → Check the starter protector of the
compressor if working normally and the coil winding if turned off. → Replace the damaged
starter, protector, or compressor. → Inspect it with power-on. →Normal. → Trouble clearing.
→ Still not normal.
No. → Remove the PC board box, check the output of compressor if there is voltage
outputted.

Check the PC board if there is voltage out-putter from the compressor. → Yes. → Check the
lead and terminal of the compressor if turn off. → Replace the defective lead or terminal. →
Inspect with power-on. → OK. → Trouble clearing. → Still not normal.
No. →Replace the PC board.
Inspection with power-on. → OK. → Replace the PC board. → Inspection with power-on.
→OK. → Trouble clearing. → Still not normal.
Still not normal.
Replace the control panel.
Inspection with power-on. → OK. → Replace the control panel. → Inspection with power-on.
→OK. → Trouble clearing. → Still not normal.
Still not normal
Replace the PC board and the control panel.
Inspection with power-on. → OK. → Replace the PC board and the control panel. →
Inspection with power on. →OK. → Trouble clearing. → Still not normal.
Still not normal.
(2) Disassembly of the connecting line and terminal for the compressor
1. Pry up the buckle from connecting line box of compressor with a screwdriver
2. Remove the connecting line box by hand.

3. Internal wiring diagram of connecting line box for compressor
Capacitor of compressor, terminal of capacitor, input terminal of compressor power, protector
of compressor, starter of compressor
4. Controlling temperature is faulty: If the temperature is different by 4℃ from setting the
temperature when cooling, that is out of control. It is caused by the fault from the
broken sensor, heater or the fan.
(1) Please refer to the clearance procedures below:
Displays faulty temperature (can freeze)
If the temperature of the lower compartment couldn’t be set to above 15℃?
Is the temperature of the upper compartment normal? →Yes. → Deal with the fault as per the
lower compartment couldn’t be set to above 15℃ (and the setting temperature is above 15℃).
No. → Check according to the logical table of the fan operating in the compartment.
Check if each fan runs seamlessly in the compartment. →No. → Check the terminal of the
abnormal fan.
→① Broken. → Repair the terminal. → Inspection with power-on. →OK. →Trouble clearing.
→②No damage. → Check the voltage of the fan terminal with power-on (12VDC). →Normal.
→ Change the fan. → Inspection with power-on. → OK. →Trouble clearing.
→③No. → Open the terminal box lid of the medium air duct panel to check the
corresponding terminal of the fans. → Check the voltage of the fan terminal with power-on
(12VDC). →Normal →Repair the bad contact. →Inspect with power-on. →OK. → Trouble
clearing.
→④No DC voltage output. → Change the electric control board.
→Inspect it with power-on. →OK. → Trouble clearing.
Yes.
Check if the evaporator is frozen heavily. (Frozen is normal.)
Frozen heavily
Check if there is a gap in the door seal. → Change or repair the door seal to make sure there
is no air coming through the door and it’s sealed strictly. → Inspection with power-on. →OK.

→Trouble clearing.
Check the sensor of defrosting. →OK.
Change the sensor of defrosting.
Inspection with power-on (Frozen heavily). →Frozen heavily
OK.
Trouble clearing.
(2) If the temperature of the lower chamber doesn’t reach 15℃ above (setting
temperature 15℃ above), please refer to the clearance procedures below:
Remark：(a) If the temperature of the lower chamber of the wine cooler is different by 3℃
above from the setting temperature, maintain 3 hours above (full wine loading after switch on
unit overnight ,then checking the temperature difference), that is abnormal temperature to be
inspected; (b) When the ambient temperature is very low (For example: ambient temperature
is 0℃), the temperature of the unit inside appear to be abnormal, it cannot reach 15℃ above
when the ambient temperature is very low. That is normal.
Problem with the temperature of the lower chamber is higher than 15℃.
Check if the ambient temperature is too low. →Yes. → Trouble clearing.
No. →Check if the setting temperature is higher than 15℃. →No. → Setting the temperature
to 18℃. →Check it after 3 hours with power-on. →OK. → Trouble clearing.
Yes. →Check the fans inside after 1.5 hours. →No. →Check the connecting of the abnormal
fan. →
①Abnormal →Repair it. → Inspection with power-on → OK. →Trouble clearing.
②No damage. →Check input power of the fan (12VDC) → OK. →Replace the fan. →
Inspection with power-on. → OK. →Trouble clearing.
③No. → Remove the connecting line box from the medium air duct panel, and check the
terminal of the fan. →Check input power of the fan (12VDC) → OK. →Repair the bad contact.
→ Inspection with power-on. → OK. →Trouble clearing. → Still not normal
④No DC voltage output. →Replace the control panel. →Inspection with power-on. → OK.
→Trouble clearing. → Still not normal
Check if the control board has voltage output after 1.5 hours with the power-on →No. →
Replace the PC board. → Inspection with power-on → OK.
→Trouble clearing. → Still not normal
Yes.
Check the terminal and PTC heater. → Not normal. →Repair the terminal or replace the PTC
heater. →Inspection with power-on. → OK.
→Trouble clearing. → Still not normal
Normal.
(3) Check the resistance value of the sensor

(a) Open the connecting line box of the median air duct panel, find the terminal of the
sensor component, check the resistance value of each connecting line by multi-meter.
It it’s close to the comparison table of temperature/resistance value, then it’s good. If
the appliance is turned off or has an open circuit, the sensor is broken and needs to be
replaced.
Terminal of sensor，lead (white) of defrost sensor, lead (black) of sensor in upper
chamber, lead (red) of sensor in lower chamber
(b) The comparison table of temperature/resistance value for the sensor
Temperature resistance value for the sensor
(c) Position of the sensors:：
The position of the sensor for the upper chamber