Technics SL-P222A - Page 19

Hi SCHEMATIC DIAGRAM
(Parts list on pages 41 ~ 46.)
(This schematic diagram may be modified at any time
with development of new technology.)
A
Notes:
$1 : Power switch in “‘on” position.
$601 : Disc holder open/close (4 open/close) switch.
* $602,603 =: Skip (Kd skip/skip PPI) switches.
$602: Kd (R), S603: PPI (F)
$604 : Stop (ff stop) switch.
¢ $605 : Pause (f pause) switch.
° $606 : Play (pb play) switch.
¢ $607 ~618 : Numeric (+10, 0, 1 ~ 10) switches.
$607: +10, S608: 0, S609: 1,S610: 2, B
$611: 3,S612: 4,S613: 5,S614: 6,
$615: 7,S616: 8,S617: 9,S618: 10
° $619 : Edit tape length (tape length) switch.
¢ $620 : Tape-side (side A/B) switch.
¢ $621 : Disc link (disc link) switch.
° $622 : Time mode select (time mode) switch.
° $623 : Programmed-play (program) switch.
° $624 : Clear (clear) switch.
¢ $625 : Recall (recall) switch.
* $626 : Repeat (repeat) switch.
¢ $627 : Auto cue ( ) switch. Cc
° $628 : Random play (random) switch.
¢ $629 : Music scan (music scan) switch.
° $630,631 =: Search (@q search BP) switches.
$630: (R), S631: PP(F)
¢$1001 : Tray (open/close) switch.
¢ The voltage value and waveforms are the reference voltage of
this unit measured by DC electronic voltmeter (high impedance)
and oscilloscope on the basis of chassis.
Accordingly, there may arise some error in voltage values and D
waveforms depending upon the internal impedance of the tester
or the measuring unit.
*The parenthesized are the values of voltage generated during
playing (Test disc 1kHz, L+R, OdB), others are voltage values
in stop mode.
¢ Important safety notice:
Components identified by A mark have special characteristics
important for safety. When replacing any of these components,
use only manufacturer’s specified parts.
.—< > /-< >---: Positive voltage lines and negative
voltage lines. E
: Audio signal lines.
Caution!
IC and LSI are sensitive to static electricity.
Secondary trouble can be prevented by taking care during repair.
¢ Cover the parts boxes made of plastics with aluminum foil.
¢ Ground the soldering iron.
* Put a conductive mat on the work table.
* Do not touch the pins of IC or LSI with fingers directly.
—-21-G
SL-P222A
1 2
e Remote control transmitter
ox
nN
SL-P222A
3 4
push inhibit
11-bit latch
shift resistor
i
Key input control circuit
Ql
2SC3265
Pulse LE
generation PaBRIVE
circuit
ICI
MN60!14HS
CONTROLLER
Timing generation circuit
e Key number description and data code
Custom code
(5 bit)
Data code
(6 bit)
0000000
Head pulse
—~a
oo 1 1
8T
Inverse data code
(6 bit)
—
001 1 ol 1 1 1
Inverse custom code
(5 bit)
————
galled
6T
150T
90T
*1T=0.454ms~0.460ms
Po [Perey | _oo1010 | 17 [search | o0o10r_|
[Jake [coor [e200
a CO
3 fe _| owns [2000000
FC TC
[sume mode | r0100r | 22 [repeat
[6 [music scan | oor | 29 [level a | 100100
[2
=<
6] J
[random [ors _|
[stop | ooo [| +
>xCustom code: 01100
a DD eS
6 7 8
FY oPerRaTion ciRcuIT
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un
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1
SYSTEM CONTROL
'& FL DRIVE
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x
2 6\R607 IM
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9.3V
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1C601
MN15283 PEY-1
SYSTEM CONTROL
& FL DRIVE
a
a
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ay REMOTE
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38 38 38
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$624 $604 $605 $606 $623 $625 R602
CLEAR) (STOP ( PAUSE I i PLAY DB?! (PROGRAM) RECALL! 4.7K
=: -L 1 1
+ b
$622 S619 $631 $626 S60 S627 $629 R603
(TIME MODE) (EO'T TAPE |(F SEARCH! | (REPEAT) | (SKIP wm) |(auTO CUE (M.SC AN) 47K
LENGTH) : L : i
+ c
$620 $621 30 $602 $60! S628 REO?
(SiDE A/B) |(O'SC LINK) |(R SEARCH) (SKIP H@! LOPEN/CLOSE 4) (RANDOM)
1 n n
een Be toe Ca peed ad
a d
s6l4 S615 S616 S6I7 S618 $607 R605
(6) 7 (8) 19) 10) (t10) 47K
n n oy 1 ! 1
+o - +0 ra) +5 |
i ae ie TE Ca a am I | A
S613 S612 0 S610 $609 $608 R606
1h (4) 133 (2) cit 10) 4.7K
1 4 i 1 1 1
t mo) i eo c nel eo eo eo
—+ f
KEY MATRIX