Technics SL-PC25

SL-PC25 .
INTERNAL CONNECTION OF FL
e Grid connection diagram
3G
e Anode connection table
| Pin No. |1/2/3/4/5[6]7[8[9 |to[11/12/13/14/15/16[17|18|19}20]21/22[23[24|25|26|27/28]29]30131]32/33/34/35|36/37/38/39/40]41/42
F|F|NIN|N N|N|N([N NiN/1/2/3/415/6|7/8 [9 NIN|F|F
powwecmon) t/t] [> P(e P(e P(e [>| P| le |e \o (a) [6 (elelalelel [+ )5]e|*] |é|e] |e plelal2
3.)1G~9G------ Grid
— 28 —
Hi SCHEMATIC DIAGRAM
(Parts list on pages 42, 43, 49 and 50)
(This schematic diagram may be modified at any time with
development of new technology.)
°$1 : Power switch in “‘on”’ position. A
°S2 : Voltage selector switch. (For [GC, PX] areas.)
°sw4i : SW block (S410-S418).
*sw42 : SW block (S401-S409).
$401 : Play (play) switch.
$402 : Pause (pause) switch.
¢ $403 : Stop (stop) switch.
¢$404, 405 : Skip (skip) switch.
[S404: F. SKIP, S405: B. SKIP]
° $406 : Program/continue (program/continue) switch.
*$407 ~ 411: Disc (disc 1 ~ 5) switches. B
leer 5, S408: 4, S409: >
$410: 2, S411: 1
°$412, 413 : Search (search) switches.
[S412: F. SEARCH, S413: B. SEARCH]
$414 : Auto link (auto link) switch.
$415 : Edit tape length (tape length) switch.
$416 : Time mode (time mode) switch.
$417 : Repeat (repeat) switch.
S418 : Random (random) switch.
$419 : Disc skip (disc skip) switch.
°$451 : Clamp switch.
Cc
¢ 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
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, 0dB), 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, D
use only manufacturer’s specified parts.
° [men : Positive voltage lines and negative
voltage lines.
E * t 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. E
FY servo CIRCUIT
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OPTICAL PICKUP
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C108
63V47
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AN8377N
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Play Q102
lozve-r
REGULATOR
2SB1240QRTV6
FOCUS/TRACKING
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CAT jOZO08:
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A H
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25va7
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AN8374S
SERVO PROCESSOR
Play
0.5ps. O1IV/DIVSS
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2.2K 16V47
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VR
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103
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1k
(4.9. 10 Veg) LOON
Rit4 68K
RII9 22K
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Play
O5Sys 2v/O1Vv.
re
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C125 0.22
1
R124 10K
Ploy
Pla
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y
2msO2v/Olv —
2ms O1V/DIV——
Nw |
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p-p
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ON, - OV
2ps 2V/D1V O2us 2V/ Div