一款STB电路讲解pdf

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AC/DCAtAALDCo12V¡5V¡3.3V¡2.5V¡1.2V¡-6.2V DCwC爲 爲

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DC:-6.2V

DC:1.2V

DC:5V

DC:3.3V

1.P21Ade

24VdA

DC:2.5V

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12VwC

SCAsAHAAC10V

0201¡GRS-232 failed a.µL5V¡GLP008¡IP003¡IP001 b.µL1.2V¡GLP007¡IP004¡IP001 c.µL2.5V¡B3.3V¡GIP005¡IP006 0226¡GRCA Audio failedd.µL- 6.2V¡GDP006¡IP003 2.-WvPH

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0226¡GRCA Audio failed

0227”: L Audio 50 Hz Tone Test failed 0229¡G L Audio 18 KHz Tone Test failed 0228¡G L Audio 1 KHz Tone Test failed 022A¡GR Audio 50 Hz Tone Test failed 022B¡GR Audio 1 KHz Tone Test failed 022C¡GR Audio 18 KHz Tone Test failed 022D¡GL+R Audio 1KHz Tone Test Failed nLGIA001 +5VP-6.2V¬OIA001PPIC001

0240¡GAudio failed SPDIFLGBA002PPIC001 3.27MHZPRS232

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27MHZ

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0201¡GRS-232 failed “0214”: 27 MHz range failed

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25MHZ

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0202”: Telnet with UUT Fail 0215”: 25 MHz range failed a.ºsWGreen»PellowLEDOG(§S)

b.ºs 25MHZOB500¡I100SOGIM300PC

(AN91C113-NC)¡IC100

4.CPU

133MHZ

SCLVG爲2.5VSDAVG爲2.5V1. ¦DnFlash ROMLHADDR_CLK127MHZ¸133MHZ¡C WEPROM: ÀsD CPU: Central Processin Unit CPUMsCMAHsAoHsCPULsMCPUAAMPEG-2WAPLC DRAM: Dynami Random Acess MemoryYAsMAHACPUHtaDRAM¤ssMAPCARAAUAsHCeDRAM爲

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0201¡GRS-232 failed a.IM104(Flash ROM)¸SN b.IM300(Weeprom)¸O c.IM200(DRAM)»PP d.IC001(CPU)¥ SOGIVM001SCLPSDAHP0201¡AVG爲2.5VC 5.SMART CARD

0241¡GSmart Card detect failed 0242”: Smart Card test data failed IS002PIS002PIC001 SOGIM300iPSMART CARD Test Fail. 6.µWBz

SCLSDAVG爲2.5V

1.CPULHWH2.DnHpURVM0AMLSMART VC

0260¡GTV SCART failed 0261¡GVCR SCART failed “0262”¡GSCART loop through failed 0263¡: TV SCART RGB failed “0264”¡GTV SCART CVBS Fail 0265¡: TV SCART CVBS Video Level “0266”: TV SCART CVBS Sync Level 0267¡GTV SCART CVBS VFR H “0268”¡GTV SCART CVBS VFR L 026A¡GTV SCART RGB G Level “026B”¡GTV SCART RGB B Level IVM001PPIC001 SOGIVM001SCLPSDAHAVG爲2.5VC

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