Panasonic EB-X70 Service Manual

Also see for EBX70 - CELL PHONE: Operating instructions Operating instructions Technical information Service manual

TECHNICAL DESCRIPTIONPMCD030901C8 Section 4 Issue 1Service Manual – 9 – Revision 04 TECHNICAL DESCRIPTION4.1. RF Overview4.1.1 General SpecificationsThe telephone is a triple band product incorporating three switchable transceivers, EGSM 900 band,GSM 1800 (DCS 1800)band and GSM 1900 band. The transmit and receive bands are given in the table below:Other notable technical features are as follows:4.1.2 Description of PCBsThe handset is of clam-shell design and uses two printed circuit boards (PCBs).The Main PCB is constructed of eight-layer FR4 material. All RF components are located on one side of the top half area ofthe Main PCB, with the baseband components (Logic circuits) occupying the lower half of the Main PCB. The RF circuit areais shielded by two metal screens. The Logic and Bluetooth circuits are shielded by one screen each.The keypad is mounted on the reverse side of the Main PCB.The second PCB is of flexible printed circuit type. All components and the connectors for the Sub LCD module, camera,receiver, main display (x2) are located on one side of this assembly.Tx RxEGSM 900 880-915 MHz 925-960 MHzGSM 1800 1710-1785 MHz 1805-1880 MHzGSM 1900 1850-1910MHz 1910-1990MHzEGSM 900 GSM 1800 GSM 1900Rx Bandwidth 35 MHz 75 MHz 60MHzTx Bandwidth 35 MHz 75 MHz 60MHzDuplex Spacing 45 MHz 95 MHz 80MHzNumber of Channels 174 374 299ARFCN (Channel Numbers) 975 - 1023 512 - 885 512 - 8100 - 1241st Tx Channel 880.2 MHz 1710.2 MHz 1850.2MHz(Ch 975) (Ch 512) (Ch 512)Last Tx Channel 914.8 MHz 1784.8 MHz 1909.8MHz(Ch 124) (Ch 885) (Ch 885)1st Rx Channel 925.2 MHz 1805.2 MHz 1930.2MHz(Ch 975) (Ch 512) (Ch 512)Last Rx Channel 959.8 MHz 1879.8 MHz 1989.8MHz(Ch 124) (Ch 885) (Ch 885)Maximum Tx Power 33.0 dBm 30.0 dBm 30.0 dBm(Class 4) (PL5) (Class 1) (PL0) (Class 1)Minimum Tx Power 5.0 dBm 0.0 dBm 0.0 dBm(PL19) (PL15) (PL15)