Technics RS-M226 - Page 12

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CHEMATIC DIAGRAM
EQUIVALENT CIRCUIT
at, 2 Q3, 4 1c1, 2 Di—6 ps—11 1c4 Ic6 Ic3 Ics \c7 5, 6 Q7,9 ae
2SD636(R,S) 2SD636(Q,R,S) [M5219L] avp1S2473 qvp1s2473 INE654N] INE652N] INE654N] INE652N} [Ms218L] 2SD636(R,S) 2SD636(Q,R,S) 2SB6410
or 2SC2021SEM —or 2SC20210RSEM [MA161] IMA161] or 2SC2021SEM or 25C2021QRSEM or 2SA937PM
EEMAIN
SECTION
[280636}
[28D636]
[280636]
[280636]
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2SD592ANC
[LN216RP]
2SB641(Q,R,S)
2SD636(Q,R,S)
_
2SB641(Q,R,S)
[2SC1846R]
[2SA885Q}
MA1220MTA
SM1A02T
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QVD1S2473
[AN6870N}
Test
tape
as
QZZCRA
[280592] or 2SA937RM_ or 2SC2021QRSEM or 2SA937RM fe s-s [MA1220) [SM1A02]} [MA161] _ [MA1047]__ [MA161]
[28B641} [28636] [288641] J
FEIREWIND: me PLAY SWITCH CAPSTAN MOTOR (QXU0297)
NOTES:
© $1-1—S1-14...... Record/playback select switch (shown in playback ° .FL meter adjustment VR (for -20dB indication). ¢ All voltage values shown in circuitry are under no signal condition. ¢ Described in the schematic diagram are two types of numbers; the supply
position). . -FL meter adjustment VR (for 0dB indication). Unless otherwise specified, voltage measurement conditions are that tape parts number and production parts number for transistors and diodes.
© $2-1—S2-4 ...... Input select switch (shown in LINE IN position). © VRQ, 10........... Bias current adjustment VR. travels is at STOP, tape mode at NORMAL, and Dolby NR switch at OFF. One type of number is used for supply parts number and production parts
¢ $3-1—S3-3 ...... Dolby NR/MPX filter IN/OUT select switch (shown in NR IN: * Connection points (A) and (B)...For erase current adjustment. REC .. ... Voltage at record mode. number when they are idential.
MPX IN position). e Resistance are in ohms (&), 1/4 watt unless specified otherwise. PLAY . . Voltage at playback mode. eg. Q1
OSA avisceecegea ots Dolby NR (B/C) select switch (shown in Dolby B position). K = 1,000@, M = 1,000KQ. RECIPLAY ...... Voltage at record/playback mode. 2SB745(TMG, UMG)-~«— Production parts number
y ,
OSB veedideviswnr see Power ON/OFF switch. ¢ Capacity are in microfarads (uF) unless specified otherwise. Normal ......... Voltage at Normal tape mode. [2SB745T] <——————— Supply parts number
° $6-1—S6-4 ...... Tape select switch (shown in CrO, position). P = Pico-farads. CrO,.. ..Voltage at CrO, tape mode. * The supply parts number is described alone in the replacement parts list.
(®...Normal, @)...CrO,, @)...Metal). ¢ The mark (¥) shows test point. e.g. W=Test point 1. Metal -Voltage at Metal tape mode.
SS tetany ees FF/Rewind muting switch (shown in OFF position). © (MPR ) this arrow indicates the flow of the playback signal. STOP ...Voltage at STOP mode. ¢ This schematic diagram may be modified at any time
SSB acer e acces casteaes Playback switch (shown in OFF position). ° (>a ) this arrow indicates the flow of the recording signal. GIR’ i csvereweciaee Voltage at Cue/Review mode. with the development of new technology.
e VR1,2 .. Input level controls. ¢ Important safety notice B ...Voltage at Dolby-B mode.
. ..Playback gain adjustment VR. Components identified by A mark have special characteristics important Cc .. Voltage at Dolby-C mode.
e VR5,6 «2... Recording gain adjustment VR. for safety. When replacing any of these components, use only
manufacturer's specified parts.
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