User guide

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system and it has been applied to the terminal when M3 Mobile adopted new Summit WLAN module. Below
table describes the key differences between the previous M3 SKY terminals and M3 SKY terminals with the
new backup battery system.
M3 SKY (Samsung)
RTC Coin Battery
M3 SKY (Summit)
Backup Battery
Main board version history
MC-71XXS
MC-
75XX/77XXS
MC-71XXS
MC-
75XX/77XXS
v1.1
v1.2
v2.1
v2.2
v2.1 v2.3
Power off using the power button
(long time)
RTC reset (v1.1)
RTC and GPS satellite data kept
for approx. 5 min (v1.2, 2.1, 2.2)
Keeps RTC and GPS satellite
information up to 50 hrs
Detaching the main battery from
power on state
RTC kept for approx. 5 min
Auto sleep mode,
force shut down phone
Hard reset / Long reset RTC reset RTC reset
Coin / Backup battery capacity 0.22 F (Capacitor) 200 mA
Charging method
v1.1, v2.1, v2.2
- Attach fully charged main battery
- Turn on the terminal
v1.2
- Attach fully charged main battery
- Attach fully charged main battery
Time taken to fully charge the
coin / backup battery with fully
charged main battery
Approx. 30 minutes Approx. 30 minutes