At present, the vast majority of the domestic fixed CDMA cell phone production enterprises have chosen to use SKD (sack knock down) bulk assembly to produce cell phones, this is because with OEM (orignal equipment manufacture) labeling or CKD (completed knock down) approach Compared with OEM (orignal equipment manufacture) brand or CKD (completed knock down) way, the SKD way has the advantages of less investment, quick results, low technical risk, fast project start, easy to organize large-scale production, can reduce the cost to a certain extent, and rapid time-to-market. Under the condition of SKD production mode, how to carry out the test and performance evaluation of CDMA cell phone to ensure product quality and test speed, which is a technical problem faced by many domestic CDMA cell phone production enterprises. How to solve the problem for manufacturers has important engineering significance and practical significance. The author now put some experience and ideas with peers for an exchange.
1 SKD test program guiding ideology
(1) to meet the relevant technical specifications and test standards
Mobile phone test
(2) with sufficient test speed and accuracy
(3) to meet the production line under the premise of production capacity requirements, the equipment input to the economy, which includes the purchase of CDMA cell phone integrated tester, transmission band equipment, test fixtures, other equipment, and other equipment. equipment, test fixtures, other testing equipment, production line statistics management equipment, etc.
(4) The technical indexes, models, specifications, data and other requirements of the test instruments to be purchased should not only be able to meet the comprehensive requirements at the present stage, but also take into account the future expandability, upgradability and maintainability.
(5) Minimize the use of the company's various resources, including manpower, material and financial resources, production sites, air conditioning, electricity, compressed air and so on.
(6) Make full use of the existing GSM cell phone production line conditions (if any) to improve, adjust and optimize the production line, in order to further reduce the cost of producing cell phones.
2 CDMA cell phone function test item classification, test scale and related standards
(1) RF transceiver index test (test transmit power, transmit spectrum, receive sensitivity, etc.): test standards for the Chinese people **** and the national communications industry standard YD/T1050-2000; the U.S. TIAIS-98 minimum performance standards for dual-mode mobile station. 800MHz CDMA digital cellular phone production line conditions (if any) to improve and optimize the production line to further production costs; 800MHz CDMA digital cellular mobile communication network air interface technical requirements.
(2) Audio index test: check or test the sending audio sensitivity, ringing loudness, receiver loudness, distortion, side tone, hands-free function and so on.
(3) LCD and menu function check: to see if it is consistent with what is described in the manual.
(4) Check of each button's tactility and strength.
(5) Inspection of battery quality: check whether the quality of the electrical connection between the battery and the motherboard is reliable, and measure the battery capacity, output voltage, short-circuit protection and other indicators.
(6) Charger quality check: check whether the quality of electrical connection between the charger and the motherboard is reliable, test the input characteristics, output characteristics, charging characteristics, charging incoming power, charging de-energized, leakage current to ground and other indicators.
(7) Reliability test: By applying certain external environmental stress (high temperature, low temperature, vibration) to the cell phone to check the reliability index of the product. This is very important, it can find a lot of product quality problems. Test standards for GB/T2423.8-1995: electrical and electronic products environmental testing.
(8) in the actual CDMA communication network in the field test: the test needs to be at different times, different locations / landscapes, and different networks in the interconnection of users to interoperate with the environmental conditions for testing and inspection. Test standards for CDMA (IS-95A) digital mobile phones into the network test implementation rules in May 2001, the Ministry of Information Industry.
(9) cell phone shell quality inspection
(10) software, MMI operation reliability and stability check.
(11) DC power consumption index: test of shutdown current, standby current, talk current, standby time.
Most of the content in the above SKD production test program for CDMA cell phones can also be used in the SKD production of GSM cell phones.