P-35B
Meaning of marks
128pin
heartbeat
165pin
DAC Reset
128pin
heartbeat
Power On
Test Program ?
Normal operation
SW/LED initialization
drive signal output
Checks abnormality
detection circuit
If it boots but does not run up to here,
the PROGRAM ROM (IC105) usually
is not the problem.
SWL01U (IC100) is defective.
Interrupt vector setup
Interrupt priority,
edge/level setup
Serial driver
initialization
Timer driver
initialization
ADSP initialization
Cancels MUT (AMP)
Timer interrupt setup
Starts OS
Starts initialization
task
Cancels MUTE (DAC)
Boot
Cancels interrupt
Test program routine
500
μ
sec
20
μ
sec
5
μ
sec
a few nsec
Indication
Normal Process
RAM Process
Description of
operation
Description of
NG judgment
Others
Judgment
NO
YES
IC100 164pin PF3 L
→
H
500
μ
sec cycle interrupt timing
after canceling interrupt.
Test output only once
before cancelling MUTE
After this, the status will be kept until cancelling MUTE.
After this, the status will be kept until cancelling interrupt.
Test output only once
before cancelling interrupt
The signal continuously changes
Backup RAM
initialization
Various task
initialization
Sets to default value
Backup parameter
setup
Non-backup parameter
setup
Enabling MIDI (Serial)
IC100 165pin PJ5 L
→
H
IC100
165pin PJ5 L
→
H
→
L
128pin PG1 L
→
H
→
L
*
1
IC100 128pin PG1 L
→
HLHL ...
Completes initialization task
Sound can be played by PAD/MIDI
Judges test program after waiting for
100 ms
The keyboard is defective if it is
impossible to enter the test
LED doesn't light even after
turning on the power.
Check the power supply.
If no abnormality is found
in the power supply, replace
the DM circuit board.
*
2
*
2
*
1
P-105B/P-105WH/P-35B/L-85WH/LP-5AWH
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