HT-R640
OPERATION CHECK-4(2/2)
This debug mode will help in digital audio no sound trouble.
Check information on FL display and the related devices or circuits.
Trouble Cause Analysis by Debug Mode
Symptom on display
Cause
Check
"E" is displayed
No input signal to DIR
Related devices from digital input to Q301
Displayed freq. is different
from input
No input signal to DIR
Related devices from digital input to Q301
Displayed format is different
from input
No input signal to DIR
Related devices from digital input to Q301
"04" or "11" do not change
to "FF"
ROM or RAM error
Q281, Q282 & related devices
Displayed format is different
from input
Input signal to DSP is no good
Related devices from Q301 to Q201
"x" is displayed
Interface between DSP and
Micro processor is no good
Related devices from Q701 to Q201
This identifies IC which
outputs error
IC outputs error to main
micro processor
Q5501, Q201, Q301 & related devices
Digit no.
on FL
10
9
11
8
6
4
1
DSP DEBUG MODE
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QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
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6
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3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
