Sony ECM-999 - Schematic Diagram

SCHEMATIC DIAGRAM
(UNIT BOARD ] {CONTROL BOARD ]
Qi~3
Low
cur
04
2SK377
OFF
->M
ev
2S8C2785
\MPEADANCE CONVERTER if meters BUFFER AMP
| eR al ak
12 Ro
cl c2 aes A9.2V
Ql
A9.2V
4.7/\0V
oO)
ee
4.7/10V
AG
ogee
o1og6e
(vr
~~ D HE F R ) cs
[wc 6 LEAs mu > Ove] 12/1Y 2 ‘
S) 3H 4S RI ON alg 3av¥t *"@ :
22k RB \ R4 RG =
82: R7
33k \ kK Fa70K S57, ®@
\
an
7
ay 1OV )
|
Ro -
22k 0) TI ® | Q5
QNIES | Si-2 28C2785
| Low CUT BUFFER AMP
@ OFF eM Vv
| ac | RII
cé @ | it 7 o 4) 9 clo a1 |A9.2V
4.7/\0V @! + 0.022 00068
+ N B cll
ON aFrov ; aS Feet
R8 3.8ev7] +
22k RIO O Py
82k ee
® !
= Q9 Q8 Q7 Q6
Si-3
2SC2785
2502785
2801020
2S8C2785
_—
02 POWER DC-DC CONVERTER DC-DC CONVERTER LIPPLE FILTER
SLPI41B OFF MeV
T 7 1.5V
| : v4 DI 9.2V
L ra ras rs t_ A J TW al
RIB Be @ © 1.5V
16 : ae
| L5V da i Ok ) i |
6
Sie Ak 1oG/i0V E 2 4 ) ow i ) E 4.7/38V iriev
IC @®) i \h ® @ANS C13
a
0.03Vg7
47/35V
1000p
DI 1S1555
Note on Printed Wiring Board: Note on Schematic Diagram:
@ oO——: parts extracted from the component side. e@ All capacitors are in ~F unless otherwise noted. pF: uuF.
e ———: parts extracted from the conductor side. 50WV or less are not indicated except for electrolytics. and
° @ : Through hole. tantalums.
° : Pattern on the side which is seen. e All resistors are in ohms, 1/4W unless otherwise noted.
° : Pattern of the rear side. kQ: 10000, MQ: 1000kqQ.
o Voltages are de with respect to ground unless otherwise noted.
e Semiconductor Lead Layouts
2SK377-K 2SC1020H 181555 SLP141B
2S8C2785
| : letter side cathode (Ss
4 a
anode || © cathode
D anode
S
ece