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Thank you for selecting the Oregon ScientificTM Jumbo RF Clock with Indoor Thermometer as your product of choice. This device is designed to give you many years of reliable service, including the following conveniences:
*Automatically synchronizes the current time and date when it is brought within range of the radio signal MSF60 generated from Rugby, England (model JM889U) or DCF77 generated from Frankfurt, Germany for Central Europe (model JM889).
In addition to providing step-by-step instructions for this product, this manual contains important safety and care information. Read the manual thoroughly, and keep it in a safe place in case you need to refer to it.
Icon | Description | Explanation |
![]() | Radio Reception Signal | Indicates the condition of radio reception. |
![]() | Low Battery | Appears when power is low. |
![]() | Alarm-on | Appears when alarm is activated. |
![]() | Alarm Time Indicator | Appears when alarm time is displayed. |
Please observe the following safety precautions when setting up and using this product.
To ensure you receive the maximum benefit from using this product, please observe the following guidelines.
When you unpack your clock, make sure to keep all the packing materials in a safe place, in case you need to later transport or return it for servicing.
In the box, you will find:
Clock unit | Batteries | User manual |
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NOTE When using the product for the first time, please note that the batteries have already been installed in the unit. To operate, locate the clear plastic battery tab inside the battery compartment and remove it.
To load the batteries:
Diagram | Instructions |
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Reversing the polarity may damage the product. |
NOTE Replace the batteries whenever the weak battery mark () is shown, the display is dim, or the display does not illuminate when the power is on. Replace all the batteries at the same time - it is dangerous to mix old and new batteries.
Contact your local waste disposal authority for instructions on how to dispose of used batteries. Used batteries can be harmful to the environment, and should not be thrown out with household trash.
You can either mount the main unit on a wall or make it stand on a flat surface.
Method | Instruction | Diagram |
Table Stand | The unit is already equipped with a Table Stand. Simply pull out the Table Stand and rest the main unit on a flat surface. | ![]() |
Wall Mount | The main unit can be mounted onto a wall using a No. 6 screw (3.0mm).
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Soon after the clear plastic battery tab has been removed, the unit immediately reads and displays the surrounding indoor temperature.
To toggle between displaying seconds or day-of-week on the LCD screen, press the CLOCK button.
This product is designed to synchronize its calendar clock automatically once it is brought within range of the radio signal. When the unit is receiving the signal, the Radio Reception symbol with start to blink. Generally, complete reception takes around 2 to 10 minutes, depending on the strength of the signal.
Radio Reception | Description |
![]() | Strong reception of radio clock signal. |
![]() | Weak reception of radio clock signal. |
![]() | No reception of the radio clock signal. |
![]() | Receiving the radio clock signal. |
Radio Reception is disabled. |
NOTE Reception can be affected by a number of factors. For best reception, place the device away from metal objects and electrical appliances. Other causes for signal interference include electrical transmission tower, steel reinforced construction, and metal siding. Reception is ideal when placed near a window.
Even though there are areas that may have more difficulty in receiving a signal, the Atomic Clock contains accurate quartz movement and will retain precise timing if the signal is missed on a rare occasion.
To manually disable the reception of the RF signal, press and hold the [UP
] and [DOWN
] buttons simultaneously for 2 seconds until the Radio Reception symbol completely disappears.
To enable the reception again, press and hold [UP] and [DOWN
] buttons simultaneously for 2 seconds. The Radio Reception symbol will blink and the unit will search for the RF signal automatically.
NOTE To adjust the clock settings manually without automatic RF synchronization, remember to disable the Radio Reception first. Press once or press and hold the [UP] or [DOWN
] buttons to adjust the value of each setting.
Diagram | Instructions |
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The main unit can display the weekday in five different selectable languages.
Symbol | Language |
![]() | English |
![]() | German |
![]() | French |
![]() | Italian |
![]() | Spanish |
Your product can also be used as an alarm clock.
By default, the unit's LCD screen displays the current date and month. To display the alarm time instead:
Diagram | Instructions |
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To adjust the Alarm Time, make sure that the Alarm Time is currently displayed on the LCD screen.
Diagram | Instructions |
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Diagram | Instructions |
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If the clock behaves strangely or stops responding, insert and press a blunt stylus into the clock's Reset Hole. The clock will then be reset to its original factory setting.
This section includes a list of frequently asked questions for problems you may encounter. If your device is not operating as you think it should, check here before arranging for servicing.
Problem | Symptom | Check This | Remedy |
Radio antenna not displayed on LCD screen. | The RF signal cannot be received. | Obstacles (either electromagnetic interference or objects) are barring the signal from reaching the main unit. | Move the unit away from any sources of interference, including other electronic devices. |
![]() | Batteries of the unit are low. | Check LCD Display of the unit. | Install new batteries into the unit. |
Clock time is not correctly set. | No radio signal reception. | Electromagnetic interference or objects are barring reception. Orientation or placement of main unit is not optimum for receiving the RF signal. | Place the main unit far away from PCs, phones, and other electronic equipment. |
No Alarm | Alarm does not sound. | Alarm is disabled. | Turn on the alarm setting. |
Operation Not Normal | Certain functions do not perform. | Device requires reset. | Reset the unit with a blunt stylus pressed against the RESET Hole. |
Dimensions: Width x Height x Depth Weight | 234mm x 220mm x 23mm 426g (without batteries) |
Radio frequency: System | DCF77 (JM889) or MSF60 (JM889U) |
Display: Time format | 24 Hour (JM889) or 12-Hour AM/PM (JM889U) |
Date format | DD-MM |
Day-of-week display | In English, French, German, Spanish, and Italian |
Clock accuracy | +/-0.5 second per day (when RF is disabled) |
Alarm: Alarm Duration | 1 minute |
Power: Power supply | 2 x UM-3 / AA 1.5V batteries |
Operating environment: Operation temperature | -5.0°C to +50.0°C |
Temperature resolution | 0.1°C |
Default temperature unit | °C |
To ensure you use your product correctly and safely, read these Warnings and the entire user manual before using the product. The warnings given here provide important safety information and should be observed at all times.
Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.
Download Oregon Scientific JM889, JM889U - JUMBO RF Clock with Indoor Thermometer Manual
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