Heathkit SB-104 - Counter C~Rcuit Board

A
Counter Circuit Board
TROUBLESHOOTING CHART
SYMPTOM
Readout of preset frequencies
incorrect
(6606.4.6603.6.6604.3)
One digit incorrect.
Will not count (preset
frequency display OK).
POSSIBLE
CAUSE
1. Time base not running.
2. IC-112 thru IC-119.
3. 5V missing.
1. Associated counter IC.
2. Associated memory IC.
3. Display board connections.
~ ~
4. Chassis wiring.
1. Premix signal missing or
low in voltage.
2. Q101.
3. IC101.