Nokia RH-128 Service Manual
Also see for 1506: User guideService manualUser guide
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Contents
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RH-128Baseband Description and Troubleshooting Keypad Faults• First check if the keypad is well located: If not, locate it again or do the replacement.• Find out if there are faulty keys. Illustrated by the interface circuit of the Keypad, except thePHONE-ON Key which is connected to the PMU Chip separately, all the keys work in groups(R0 to R5 and C0 to C3) and each group uses one CPU’s GPIO. Thus the faulty running GPIOcan be located by confirming the faulty keys. Further, short circuited signal or cold welding ofthe CPU should be modified or replaced.Keypad Faults TroubleshootingCOMPANY CONFIDENTIALCopyright © 2009 Nokia. All rights reserved.Issue 1Page 5-20 |
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