Brother BAS-304A - Page 8

Connector No. and location
Main PCB
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· I Programmer ~
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IIP31 P7 II
86
I Floppy disk I
Main PCB
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ome position Y ome positiOn
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Drive signals and source
+SV
Speed control signal
Key and switch signals
Indicator control sig~ls
Read and write signals
from/to floppy disks
X
andY home position
signals
EM switch signal
LED signal
Drive signal
Presser plate lifting signal
Symptoms resulting
from wrong connection
• The POWER lamp does not come on.
• Although the speed <ontrol dial is turned,
the machine does riot change the rotation
speed and keeps it at 2000 spm.
• Malfunction of programming device
• The floppy disk data cannot be read.
(Error No.4)
• The machine cannot detect home position.
• The emergency stop function cannot be
activated.
• The EMERGENCY stop lamp lights and its
function cannot be canceled.
• The machine neither starts operation nor
lifts the presser plate If the corresponding
foot switch is depressed.
From the library of: Superior Sewing Machine & Supply LLC