Technics RS-M226 - Block Diagram; Dolby System Block Diagram (L-CH ONLY)

BLOCK DIAGRAM
Recording System(L-CH ONLY)
RS-M226
INPUT SELECT SWITCH =_>— > ~
LINE LINE <—»® MIC
$2-4 $2.2
LEVEL
CONTROL
a oT> | ©
pr sts] Ly
Pp VR5 RECORDING
FOAM GAIN ADJUSTMENT VR
MICROPHONE AMP
RECORD/PLAY
BACK HEAD
= §
VR10 BIAS
Y- CURRENT @) )
ADJUSTMENT VR Metal
> e (6) J x $6-3
Cro,
[-—} O ©
TAPE SELECT
is Se oe Ee 5 0 fo SWITCH
Normal
07 RECORD
INDICATOR
a
ERASE HEAD |
Metal
-O 6-1
cro,
O
|
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|
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Le
BIAS OSC
Playback System (L-CH ONLY)
RECORD/PLAYBACK
HEAD
1C1 PLAYBACK EQ AMP
PLAYBACK
GAIN
ADJUSTMENT
a
MUTING FF/REWIND
CONTROL |
MUTE
i
r
FF/REWIND
CR
NETWORK
MUTING SWITCH (70ys) |
|
|
L
Cro,
Normal ©
O Metal
O
S6-2 i
TAPE SELECT SWITCH
Power Supply System
1C7 a
METER &
HEADPHONES
AMP
Th
VOLTAGE
REGULATOR
DOLBY NR
SECTION
103-6
FL METER
SECTION
IC8
Q15
VOLTAGE
REGULATOR
NOTE:
* Dolby NR...... OFF
° (mmm ) this arrow indicates the flow of
the recording signal.
¢ (<>) ) this arrow indicates the flow of
the playback signal.
MUTING
CONTROL
Q11—13
FL METER
FILAMENT
(\
D13—16 |
RECTIFIER
CAPSTAN
MOTOR
T HEADPHONES (2)
~~ V
METER & HEADPHONES
RS-M226
DOLBY SYSTEM (L-CH ONLY)
LINE
OUT
Dolby-B
Encode
MIC.
MIC IN AME Ic3 section to check the frequency Mien tiie
iit NE6S4N response of the Dolby circuit in the O
HEADPHONES AMP A +
vRi Ics illustration.
NE652N
LINE IN 5 () q
O oO C RECORD
AMP
MPX FILTER (2)
HEADPHONES
JACK
METER
HEADPHONES
LINE OUT
Q8, 9
PEAK HOLD O
SET/RESET
UI
+4
H.F—O—O—0O
>
IS YMd
A0/0/8
O—D—_5—O—©
3
HIGH PASS FILTER
im
N
Dr
[2
ae
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(©)
Le
>
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DOLBY NR CIRCUIT
FREQUENCY RESPONSE
HEADPHONES Pee 1kHz: +6dB+2.5dB
JACK
Ty 5kHz: + 8dB+2.5dB
Dolby-B Decode
VR5
Q8, 9
PEAKHOLD
SET/RESET
METER
HEADPHONES
LINE OUT
ddNS YMd
AsO/0/8
x
POWER
ON/OFF
SWITCH
~~ &£ HIGH PASS FILTER
PB EQ AMP
Refer to Item © “Dolby NR circuit” of
the measurement and adjustment
Dolby-C Enca
LINE IN
(G O
E MPX|
METER
HEADPHONES.
LINE OUT
(G
Spectra
skewing
networ!
LS
Low level stage
integrating
filter
Anti-satur:
Low level stage
high pass filter
REC EQ AMP
Dolby-C Deca
METER
HEADPHONES
LINE OUT
Spectral
skewing
network
Low level stage
integrating filter
PB EQ
Low level stage
high pass filter
Anti-Saturation filta