Am, Hp, Jk, Pn1, Pn2, Pedal Circuit Diagram - Yamaha P-85 Service Manual

H G

AM, HP, JK, PN1, PN2, PEDAL CIRCUIT DIAGRAM

PN1
OP AMP
AM
to DM-CN501
<Page 4 A-5>
JK
Photo Coupler
to DM-CN601
<Page 4 H-1>
28CC1-2001022994-1
F E
OP AMP
OP AMP
IN
MIDI
with a heat sink
OUT
PEDAL
D
PN2
HP
to DM-CN602
<Page 4 H-2>
POWER AMP. 6W+6W
with a heat sink
REGULATOR +5V
REGULATOR +5V
AM, HP, JK, PN1, PN2, PEDAL CIRCUIT DIAGRAM
C B
PHONE 1
PHONE 2
SPEAKER L
SPEAKER R
TO PEDAL
DC IN 12V
+ –
Note : See parts list for details of circuit board
WARNING
Components having special characteristics are marked
replaced with parts having specification equal to those originally installed.
A
P-85/P-85S
μPC2905AHF-AZ (X7252A00)
REGULATOR +5V
AM: IC401
1
1: INPUT
2: GND
1 2
3
3: OUTPUT
NJM7805FA (XJ607A00)
REGULATOR +5V
AM: IC401
1
2
3
1: INPUT
2: GND
3: OUTPUT
AN78N05 (XA507A00)
REGULATOR +5V
AM: IC402
2
1: INPUT
1
2: COMMON
2
3 3: OUTPUT
2SC1740S (IC174070)
TRANSISTOR
AM: TR402
JK: TR301, 302
2
3
1: EMITTER
1 2: COLLECTOR
2
3 3: BASE
1
2SB1342 (WD926900)
TRANSISTOR 3
AM: TR401
2
1 1: BASE
1 2: COLLECTOR
2
3
3 3: EMITTER
PEDAL
DAMPER pedal
4
SOSTENUTO pedal
SOFT pedal
28CC1-2001015873
: Ceramic Capacitor
: Mylar Capacitor
: Semiconduct Ceramic Capacitor
5
component parts.
and must be
5
6