Siemens S55 Repair Documentation page 37

Restrictions
• A battery which has completely run down can not be re-charged quickly because
the battery voltage is less than 3.0V and the logic which implements the charge
control cannot be operated at this low voltage level. In this case the battery is
recharged via trickle-charging. However, the charging symbol cannot be shown in
the display because at this time logic supply voltages are not operating. The
charging time for this trickle-charging (until the battery can be fast-charged from
then on) is in the range of 1 hour. If, within this time, the battery voltage exceeds
3.2V, then the POWER SUPPLY ASIC
continues in the Charge-Only Mode. In some circumstances it can happen that
after trickle-charging and the usually initiated switch-on procedure of the mobile,
the supply voltage collapses so much that the mobile phone switches off again. In
this case trickle charging starts again with a now raised threshold voltage of 3.75V
instead of 3.2V, at maximum for 20 minutes. The
switching on the phone up to 3 times (within 60 minutes overall).
•
Charging the battery will not be fully supported in case of using old accessory
(generation '45' or earlier). It is not recommended to use any cables that adapt
"old" to "new" Lumberg connector. Using such adapters with Marlin will have at
least the following impact:
1) half-sine wave chargers (e.g. P35 & home station) can not be used for trickle
charging
2) normal charging might be aborted before the battery is fully charged
3) EMC compliance can not be guaranteed
• A phone with a fully charged LiIon battery will not be charged immediately after
switch-on. Any input current would cause an increase of the battery voltage above
the maximum permissible value. As soon as the battery has been discharged to a
level of about 95% (due to current consumption while use), it will be re-charged in
normal charging mode.
• The phone cannot be operated without a battery.
• The phone will be destroyed if the battery is inserted with reversed polarity:
• ⇒ design-wise it is impossible to wrongly pole the phone. This is prevented by
mechanical means.
• ⇒ electrically, a correctly poled battery is presumed, i.e. correct polarity must be
guaranteed by suitable QA measures at the supplier
• The mobile phone might be destroyed by connecting an unsuitable charger:
• ⇒ a charger voltage >15V can destroy resistances or capacitors
• ⇒ a charger voltage >20V can destroy the switch transistor of the charging circuit
In case the transistor fails the ASIC will be destroyed. In the case of voltages lower
than 15V and an improper current limitation the battery might be permanently
damaged. A protection against grossly negligent use by the customer (e.g. direct
connection of the charge contact to the electricity supply in a motor car) is not
provided. Customer safety will not be affected by this restriction.
V1.00
S55/S57
switches on the mobile and charging
Page 37 of 49
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