9-4

Troubleshooting Charts: Power-Up Failure

 

 

 

Power-Up Failure—Page 2

1

Probe

16.8MHz

Signal at R615

Signal may appear for a very short period of time (50ms). Use an oscilloscope with trigger to capture signal.

Note: All components noted on this chart are VOCON components.

Signal

greater than

600mV?

Yes

Check

16.8MHz Signal at

C607

Signal

greater than

600mV?

Yes

Refer Board to

Service Depot for Reflash, Patriot, SRAM, and FLASH Analysis

Investigate

No 16.8 MHz

Reference

Oscillator

Investigate

No Clock Buffer

Components and

Isolate Problem

2

Components No

OK?

Yes

Replace

Y301

This signal may contain harmonics and, therefore, may not appear as a perfect sinewave.

Replace

 

 

 

Yes

 

Problem

 

Fixed?

End

 

 

Component

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

Fixed?

No

Replace

 

U301

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

November 11, 2004

6881094C12-A

Page 108
Image 108
Motorola SSETM 5000 service manual Ok?