POLAR M21 - Manual (Page 51)

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... HEART RATE READING BECOMES ERRATIC OR
EXTREMELY HIGH?
You may have come within range of strong
electromagnetic signals which cause erratic readings on the
wrist receiver display. Check your surroundings and move
further away from the source of disturbance.
Precautions
... THERE ARE NO REACTIONS TO ANY BUTTONS?
Reset the Polar Heart Rate Monitor. Resetting clears watch
settings which will return to the default settings. User
information and measurement options settings will be
saved.
1. Press the RESET button with a pen tip.
Display becomes full of digits.
2. Press any of the four button once.
The Polar Heart Rate Monitor enters the Time
of Day display.
If you don't press any button after reset within one
minute the wrist receiver goes to the battery saving
mode.
... THE DISPLAY IS BLANK OR FADING?
The Polar Heart Rate Monitor is in battery saving mode
when it leaves the factory. Wake up by pressing the START/
STOP/OK button twice.
The Polar Heart Rate Monitor enters the Time
of Day display.
Usually the first sign of a discharged battery is fading of
the digits when using the backlight. Have the batteries
checked. Customer Care Charter
... THE BATTERY OF THE WRIST RECEIVER MUST BE
REPLACED?
We recommend having all service done by an authorized
Polar Service Center. This is especially necessary to ensure
the warranty remains valid and is not affected by incorrect
repair procedures done by an unauthorized agent. Polar
Service will test your wrist receiver for water resistance
after battery replacement and make a full periodic check of
the complete Polar Heart Rate Monitor. Care and
maintenance/Batteries and Customer Care Charter
M52 man USA GBR A 2001 10/12/01, 12:46 52