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Summary of Contents for FLY DS105
- Page 1 FLY DS105 Service Menu Version number:V1.0 2010-07-01 SAGETEL MOBILES (NINGBO) CO.，LTD...
- Page 2 1. The Working Principle of MTK Platform Mobile Phone This MTK platform mobile consists of the baseband part (MT6223D) and RF part (transceiver MT6139N and power amplifier SKY77542). 1.1 The Diagram of Mainboard Circuit (Integrated), Memory, CPU, Keyboard, LCD module, Audio circuit, RF circuit and etc.
- Page 3 The RF part of the MTK mobile phone consists of MT6139N, Power Amplifier and Front-end Switch filter module. The RF circuit has two major functions: First, it receives the selected RF signal from the antenna, demodulates the baseband signal and then transmits this lower frequency signal to CPU. Second, it modulates the baseband I, Q signals into the designated RF frequency and amplifies the power to radiate the signals from the antenna.
- Page 4 1.5 Clock Circuit 26MHz Clock Circuit: With the function of the VCXOEN, the generated 26MHZ clock signal, which is basic frequency, is transmitted into 21 pin of MA301. One of the signals as the system clock is transmitted into CPU. 32.768KHZ Clock Circuit: 32.768KHZ Clock which mainly composed of the external crystal Y100, as a real-time clock signal, is transmitted to CPU for the calculation of real-time...
- Page 5 Figure 4 As indicated in Figure 3 is the SIM card interface circuit; Figure 4 is the dual SIM card dual standby circuit. If the problem is “SIM card is not inserted”, you can check: 1. the SIM card is damaged; 2.
- Page 6 Figure 5 Receiver： Figure 6 Speaker： Figure 7 It’s easy to find such problems as the receiver, speaker is silent or Mic mute. It’s usual to dial No *#15963# for us to test whether the phone Receiver is silent or MIC mute. After entering the test engineering type, there is a function of “loopback”...
- Page 7 the loopback test, it needs to determine the problem between receiver and the MIC. This can be solved by dialing 112 to judge whether the MIC circuit works well. If not, it’s the receiver circuit or both have the problem. receiver circuit Firstly, you should check whether the receiver circuit is good or not.
- Page 8 Figure 8 firstly, it needs to inspect whether the mobile’s metal demo pastes well or not; the keypad is dirty or not; However, if there still has the problem, you should check CPU chip 2.4 LCD Interface Circuit Showing abnormalities usually presents as follows: no display, the un-shining of the backlight LED, Screen fuzzy or color disorders.
- Page 9 board is good. Then we need check whether the diode(CR502) polarity is correct and the diode is damaged or not. At last, we adjust the digital power to 2 V, plus the two control points on the vibrator. If the vibrator do not vibrates, it illustrates that the vibrator is broken, and replace a new one.
- Page 10 Figure 11 2.7 Do not power on the mobile There are four conditions that cell phone can be boot-strapped and work normally: i. the properly working of power IC ii. the correct clock signal iii. the properly working of logic circuits iv.
- Page 11 voltage to the logical circuits, including CPU, FLASH and clock circuits. b. correct reset signal. While the CPU power-on, it can’t work correctly because the register is random at that time. So CPU must be reset by the reset signal which is usually logic low.
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