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No
Yes
No
applied to Q41 base?
Yes
No
applied to Q42 base?
Yes
Defective Q42
l
Poor R44 soldering
l
ALL KEYS FAIL TO
TRANSMIT INPUT
No
No
Defective Dl, D2
l
Defective Q40'
l
Poor soldering of R42,
l
R45, R46 and R48
Defective 041
l
Poor soldering of R43
l
and R47
Yes
Defective
Connector (H)
l
l
stop switch
l
1
No
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Table of Contents
Troubleshooting
