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Model 5065A
Circuit Diagrams, Theory, and Maintenance
AI9 A3 CLOCK DISPLAY tososi-ei is)
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39
RIO
39
R I
39
RI2
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39
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39
RI5
39
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BCD
8
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^
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DSI
SEE
NOTE 3
SEE
NOTE 3
P/O
AI9A2
P/O
AI9AI
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_ B _ X B L K _
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NOTE 3
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NOTE 3
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NOTE 3
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NOTE 3
NOTES
1 . REFERENCE DESIGNATIONS WITHIN THIS
ASSEM8LY ARE ABBREVIATED. ADD
ASSEMBLY NUMBER TO ABBREVIATION
FOR COMPLETE DESCRIPTION.
2 . UNLESS OTHERWISE INDICATED:
RESISTANCE I N OHMSi
CAPACITANCE I N MICROFARADS!
INDUCTANCE I N MICROHENRIES
3.
7-SEGMENT DISPLAY, TYPICAL DSI
THRU DS6
4 . A COUNTER PLACED AT THIS POINT
WILL
COUNT
51 PULSES/SECOND.
THIS IS DUE TO A SWITCHING TRAN
SIENT. THE TRANSIENT IS TOO NAR
ROW TO TRIGGER THE CLOCK ACCU
MULATOR (A16A2U1), THUS THE DIS
PLAY TIMING IS NOT AFFECTED.
^ n
r
^ ~ ^
_
APPROXIMATION
OF DISPLAY AND
SEGMENT SWITCHING WAVEFORM. IN
SOME CASES THE SAME SEGMENT IS
OFF
IN ALL DISPLAYS
GIVING
A
STRAIGHT LINE WAVEFORM. WAVE
FORMS WILL CHANGE EACH SECOND
WITH CLOCK RUNNING.
Figure 7-17. A19 LED Digital Clock Assembly
7-51
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