Sony BVU-950 Training Manual

DEFECT ANALISIS IN MICROCOMPUTERSKY Microcomputer- Hardware Check ModeBy shorting TP4 on the KY-101 board with ground,the KY microcomputer enters the hardware checkmode in which the following operations are performed.This mode makes it possible to confirm that all thedata sent from the KY microcomputer to the 7-segment LED are correct,While the KY microcomputer is operating, thehardware check mode is entered when PO-1 (TP4) isset to a low logic level.(1) “8” lights for each of the digits of the 7-segmentLED (for 2 sec.).(2) “8” lights for the lowest order 7-segment LEDdigit, and at 0.5 second intervals the digits lightin high-order sequence (this is conducted twicefor the 8 digits).(3) All digits from “0” to “°F” for the 7-segmentLED light at 1 second intervals.(4) All 35 key lamps tight (for 4 seconds).(5) Upon completion of steps (1) through (4), theoperation of the switches is checked. Whiledepressed, the switch matrix number is indicatedon the 7-segment LED. When a multiple numberof switches are set ON, display priority is givento the lowest matrix number. When a switch isnot pressed, appears.(6) During PO-1 is low, the status in (5) is maintained:when it is high. the normal operation mode isentered.Key Switch MatrixKEY SWITCH MATRIXDisplay(1) 88:88:88:88(2)(3)FE:EE:EF:FF -FP FP:(4) All key LEDs(5) .iFme ° ae * we °c wow° e eBienenin gn intnin tngn entnentnennnananRBSRRREKRKKRRFKRKKRKKRKKKKKKBlseclsecLight up for 4sec.KEY SW CHECK MODE1 | 6as 2 1VIDEO | ASSEMBLE | PREVIEW AUTOAUDIO || sotCH-1REVIEW CUTREW EJECT SEARCH EDIT REC em STANDBY | AUDIOCH-2RECORDER | PLAYER | PB i STOP |__ PLAY| DATAa:||1TRIMG)| TRIM(-) | ENTRYLED DISPLAYGD ()co|%x3-2