Benefon TGP-65-EU iO, Руководство по обслуживанию

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15.1.1999
3GP_60GB 2
Product: TGP-60-EU (Vega) / Local Service Mode
4.1.3 Power source
The service adapter has an external power supply input. This is connected to the V-
CHG pin on phone’s base connector. There is no current regulation or charge control
circuitry between external power supply and phone battery (except a fuse inside the
service adapter). Use the power supply with a 1 A current limit to protect the fuse
and battery. You can still overcharge your battery if you leave the phone with battery
connected to service adapter for a long period.
The service adapter takes its own operating power from the V-BAT pin on the base
connector. You can use the service adapter without an external power supply if
desired. However, you cannot perform A/D converter battery measurement refer-
ence value.tuning (you must be able to set the battery voltage very precisely).
The transmitter on a GSM phone takes very short, high-current pulses. You must
have a battery pack or large capacitor (for example, 4700 microfarads/10 V) con-
nected to battery pins if you are going to perform RF tuning and/or measurement.
You can do logic board tests and update software without the battery or capacitor.