Sony CNU-500 Installation And Maintenance Manual

Also see for CNU-500: Maintenance manual

2-7 (E)CNU-500AT-100 Com. check mode. (AUTO)MSUCCU1CCU2CCU3CCU4CCU5CCU6RCP1RCP2RCP3RCP4RCP5RCP6VCSOKNGNGNGNGNGNGPush [SET] key !!AT-100 Main check mode. (AUTO)EPROM CheckOPTION FLASH CheckOKRAM CheckOPTION EEPROM CheckSWITCH CheckOKWRITEERASEREADS2S3S4S5Check end Push [SET]keyOKOKOKOKOKNGFDOWNCANCELN / P CHANGE CheckNTSCPALTrouble 8 : An NG message is displayed at the pointwhere a CCA-5 cable is connected.Remedy : The MSU ↔ RCP1 display is NG.→ Confirm if IC902 and its peripheralblock, and IC305 and its peripheralblock are not defective.The CCU1 ↔ RCP2 display is NG.→ Confirm if IC304 and its peripheralblock, and IC405 and its peripheralblock are not defective.The CCU2 ↔ RCP3 display is NG.→ Confirm if IC404 and its peripheralblock, and IC505 and its peripheralblock are not defective.The CCU3 ↔ RCP4 display is NG.→ Confirm if IC504 and its peripheralblock, and IC605 and its peripheralblock are not defective.The CCU4 ↔ RCP5 display is NG.→ Confirm if IC604 and its peripheralblock, and IC705 and its peripheralblock are not defective.The CCU5 ↔ RCP6 display is NG.→ Confirm if IC704 and its peripheralblock, and IC805 and its peripheralblock are not defective.The CCU6 ↔ VCS display is NG.→ Confirm if IC804 and its peripheralblock, and IC903 and its peripheralblock are not defective.2-6. Self-DiagnosisFig. 7Trouble 7 : The signal input to the REFERENCEconnector appears as an NG display orthe NG display stops halfway.Remedy : Confirm that IC42 or its peripheral block(area enclosed with A-13, I-15, G-13, andG-15 on AT-100 printed circuit board),and CN1 harness are not defective.d) Command Block Check1. Confirm that the display shown in Fig. 7 appears andset S5 switch (on the AT-100 board panel) to the SETposition. Release S5 switch (on the AT-100 boardpanel) just when the display shown in Fig. 8 appears.Confirm that an OK message is displayed at the pointwhere a CCA-5 cable is connected and that an NGmessage is displayed at the point where it is notconnected.Fig. 8

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