Service manual

Overview
A6188 is a microprocessor controlled, full duplex, synthesized FM radiotelephone using
digital modulation techniques, for use in compatible 900MHz/1800MHz cellular
radiotelephone systems. When operated properly, the equipment will provide the
user with land-linked telephone service through individual cell site base stations,
all linked to a central control office.
Physical Packing
It introduces Five major new IC’s known as
WHITECAP,MAGTC,GCAP? ,MCIC, TX-VCO IC and Dragonball.All IC’s are
BGA parts(Ball Grid Array) except TX-VCO module.The antennas style is
Telescopic direct connect.Vibrator is at the bottom of the back housing and not in
the flip.There is no auxiliary battery. The type of the battery is CD928, and the
charge/discharge parameters are readjusted. The battery selecting circuit is
eliminated.
There are six cans covering the PC board, it uses a mini SIM Card holder and
connector is protected by the battery as in d560 and Modulus? .
The RF power levels of A6188 are the same as for all previous GSM products.
The accessory connector, situated at the top of the A6188 on the main board,
allows connections to the circuity and antenna for accessory applications such as
a mobile adaptor. When the accessory RF connector is used, the RF to the
antenna is disconnected. Grounding shields,(with removable covers) on the main
board provide electrical isolation and protection to the RF circuits.
3. 2 Features/Feature List
Features
Dual Band Capability: The phone can automatically change the phone operation from
GSM band to DCS 1800 band and vice verse.This provides advantages for two
different types of Network Operators:
*A DCS1800 Operator may allow users to roam onto GSM nerworks.
Thus,the DCS1800 user potentially has the same geographical coverage as
a GSM user, often wider than he would with a pure DCS1800 phone.
*A Network Opeator with both GSM and DCS1800 systems may allow users
to use either system.Thus, if the DCS1800 system is busy or there is no
system coverage, the phone can attempt a call on the GSM band and vice
verse.
Taichi Feature List: