Yamaha P-115B, Руководство по обслуживанию

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P-115B/P-115WH/P-45B
■
■
SYSTEM■BOOTING■FLOWCHART
P-115B/P-115WH
* 1 As for the safe check, it checks whether the mute functions correctly when the pulse from ERR-DETECT is interrupted.
* 2 “Factory Set” refers to the condition of turning on the power after executing “Factory Set” in the Test Program.
Initialize SWX port
Scanning SW
(PB0-PB3)
PA0 = L
→
H
→
L
(IC1, A20)
PA2 = L
→
H
→
L
(IC1, A19)
Port initial setting
SPOFF = H (IC1, T2)
MUTE = H (IC1, T3)
ERR-DETECT =
L (IC1,AB19)
Initialize BOOT SDRAM
0 clear, Setup of
constant
Starts accessing to IC18
PA1 = L
→
H
→
L
(IC1, B19)
Set
CPU, each registers
Pulse is output from
ERR-DETECT
(IC1, AB19)
If not, IC1 may be
defective
Starts accessing to IC8
If not, IC18 may be
defective
PA3 = L
→
H
→
L
(IC1, D18)
Installation
mode ?
YES
NO
YES
NO
OK
NO
NG
YES
Start scanning to
SW, LED and key
Safe check ?
(
*
1)
Test Mode ?
After
executing
Factory Set ?
( * 2)
MUTE = L (IC1, T3)
SPOFF = L (IC1, T2)
Main routine
Depending on whether
headphones are
inserted or not.
END
Power On
If the “Safe check” result is NG,
booting will stop. In that case,
check abnormality detection
circuit by Test Mode.
END
END
Starts installation mode
(REC LED blinks)
Starts Test Mode
(A3 sine wave is output)
PLAY and REC LEDs blink until
Factory Set completion