Technics RS-M226 User manual

ORDER NO. ARD82060161C8-11
Service
Manual
Cassette Deck
Soft-Touch
Cassette
RS-M226
Deck
with
Dolby
B-C
NR
(ee
Sied
Silver
Face
This is the Service Manual for the }
| following areas.
a) oe For all European areas
| except United Kingdom.
|B) eee For United Kingdom. |
DC [porev 8-c nm
Please use this service manual for the RS-M226. (Discard the
service manual prepared for the order No. ARD82050142C8-11.)
RS-M24 MECHANISM SERIES
Specifications
Track system: 4-track 2-channel stereo recording and playback Inputs: MIC; sensitivity 0.25 mV, applicable microphone
r. a ety impedance 4002—10kQ—
gee SReees Ones LINE; sensitivity 60 mV, input impedance more
Wow and flutter: 0.048% (WRMS), +0.14% (DIN) er . ce ae eee
: ut lev m impedan
Frequency response: Metal tape; 20—18,000Hz ae less ia 23 ko Dia ee aos
30— 17,000 Hz (DIN) HEADPHONES; output level 80mV (82)
CrOz tape; 20—18,000Hz applicable headphone impedance 8 2—600 Q
30— 16,000 Hz (DIN) Bias frequency : 80 kHz
Normal tape; 20 17,000Hz Motor: Electrical DC governor motor
30 — 15,000Hz (DIN) Heads: 2-head system
1 MX head for rec/playback
Signal-to-noise ratio: Dolby C NR in; 75dB (CCIR) 1 double-gap ferrite head for erasure
Dolby B NR in; 67 dB (CCIR) Power requirements: [DB] --- AC 220 V, 50-60 Hz
NR out: 57dB (for all European areas except United Kingdom.)
(signal level=max. input level A weighted, CrO eee
gnal level =max. input level A weighted, CrO2 ;
(only for United Kingdom.)
type tape) Power consumption: 12W
Fast forward and Dimensions: 43.0 cm(W) x 10.9cm(H) X 23.3 cm(D)
rewind time: Approx. 90 seconds with C-60 cassette tape Weight: 4 Okg
Specifications are subject to change without notice.
* ‘Dolby’ and the double-D symbol are trademarks of Dolby Laboratories.
Technics
Matsushita
Electric
Trading
Co.,
Ltd.
P.O.
Box
288,
Central
Osaka
Japan

RS-M226
CONTENTS
ITEM PAGE ITEM PAGE
LOCATION OF CONTROLS BLOCK DIAGRAM cercccrcereecerceeetecereeeeeeneaeeetenans 9
AND
COMPONENTS
-oeeccccceeeeteeteeteseeeeseeeeeees
2
SCHEMATIC
DIAGRAM
-rcccceeeereeccectcececeeeeeeeess
13
DISASSEMBLY INSTRUCTIONS 3 -+-trr-srsrse sere 2 CIRCUIT BOARDS AND
MEASURMENT AND WIRING CONNECTION DIAGRAM -+++++ee-++0+ 15
ADJUSTMENT
METHODS
---eeccceerreeeteteet
teres
3
MECHANICAL
PARTS
LOCATION
-orrrereeeceertee:
18
ELECTRICAL
PARTS
LOCATION
crveersrcteeeteete
8
CABINET
PARTS
LOCATION
-orerreecccterrreeteenteees
22
LOCATION OF CONTROLS AND COMPONENTS
7 Headphones Jack (phones) Tape Counter (tape counter)
Power Switch [power (push on)] Recording Indicator (rec)
Eject Button (eject) Input Select Button
{input select (Mlinee = mic)|
Cassette Holder FL (fluorescent level) Meter
|
XX ___| @
Input Level Controis
[input level(L -> R)]
Gar Selector
{tape select (NormaleCrOzeMetal)|
Fast Forward/Cue Button
(ff/cue (PP )])
Dolby Noise Reduction Select
Counter
Reset
Button
Switch
[Dolby
NR
(2
Be
=
@)]
{counter reset)
Rewind/
Review Button
[rew/rev
(
44
)]
Microphone
Jacks
[mic (lefteright)]
Dolby Noise Reduction Switch
(Dolby NR (2 oute™ in)}
en ene enn & 7— AC Power Voitage
Select Switch
= ae SE 5
|
Play
Button
Record
Button
—
fl
|
(play- 2(>)] iree-& (O)] (cae “P|
——- { eo 4-4
|
i
Stop Button Pause Button
[stop (m)] (pause (11)] L
Line Output Jacks [LINE OUT (LeR)]
—— Line Input Jacks [LINE IN (L@R)]
DISASSEMBLY INSTRUCTIONS
* The head azimuth
can be adjusted by removing
the cassette lid.
| Fig. 1
Power
supply
(D) circuit Flat
Record/
playback
connection
wire
iRecord/playback =p
‘connection ss \
iwire A
circuit (F
board
Fig. 5
—2—

RS-M226
Procedure To remove —— . ; Shown in fig. —— .
1 Case cover * 2 screws 1
+ 3 screws
(Slide in direction of arrow)
Bottom cover
+ Pull out the flat cable from
connector
Power supply circuit * 2 Screws
board * Cord clamper
+ Pull out the switch rod-C
+ 2 red screws
Front panel
FPR] WM] WWWWWw
FL.
meter
unit
+
Meter
cover
and
meter
filter
+
Pull
out
the
FL
meter
unit
+ 3 red screws
* Pull out the switch rod-E
+ Pull out the flat cable from
connector [4]
* Pull out the socket
+ As shown in fig. 3, push the claw in
the direction of arrow (®, {lift the
main circuit board in the direction
of arrow @.
+ Remove the record/playback
connection wire in the direction of
arrow @) while lifting the main circuit
board in the direction of arrow @ as
shown in fig. 3.
17 2-4>5->6 Main circuit board
+ Cassette lid
1324-57 Mechanism unit * 4 red screws
»* Pull out the counter reset lever
17 2-45-78 Cassette holder
Se gee” OSA A ATPRILOHY: So ° «ie
(TPO (TPO | geelrpatecny TRB /TP7\
\ a A \ !
IU J dein 14° | VRS vR6e * ay. veay:
a APIN J pea
N, ‘ * ye
swe ~
XN
Tape speed
adjustment VR \
/ TP6 \
K P
Fig. 1
NOTES: Keep good condition, set switches and controls in the following positions, unless otherwise specified
@ Make sure heads are clean e Tape selector. Normal position
@ Make sure capstan and pressure roller are clean @ Input selector: Line in
© Judgeable room temperature: 20 +5°C (68 + 9°F ) ®@ Input level controls: Maximum
® Dolby NR switch: OUT

RS-M226
ITEM MEASUREMENT & ADJUSTMENT
@
Head
position
(The
head
adjusting
plate
is
provided
to
adjust
the
tape
Screw
(A)
adjustment
touch
of
the
head
in
cue
or
review
mode)
Capstan
Condition 1 Press the playback button and pause button
* Playback and pause mode 2. Measure the space between the pressure roiler and the (B)
capstan
Head Adjusting Plate
Pressure Roller
Standard value: 0.5+0.3mm
Space (adjustabte)
If the measured value is not within the standard value, -” }
untighten screw (A), and slide the head adjusting plate ;
in the direction of arrow (B) for adjustment Fig. 2
@ Head azimuth L-ch/R-ch output balance adjustment LINE QUT
adjustment 1. Make connections as shown in fig. 3. merpeu/ paynael
Condition
+ Playback mode : _ os sill
: Playback the 8kHz signal from the test tape (QZZCFM) Playback mode VIVM Oscilloscope
Equipment
:
abe
;
;
i
Ve
2
Oaslotone
ene
(B)
in
fig.
4
for
maximum
output
L-ch
and
Fig.
3
* Test
tape
(azimuth)
When
the
output
levels
of
L-ch
and
R-ch
are
not
at
c
pees
Mint
~
Q2ZCFM
maximum
at
the
same
time,
readjust
as
follows
Turn
the
screw
shown
in
fig.
4
to
find
angles
A
and
C
(points
where
peak
output
levels
for
left
and
right
channels
are
obtained).
Then,
locate
the
angle
B
between
angles
A
Screw
(B)
Fig.
4
and
C,
i.e.,
a
point
where
L-ch
and
R-ch
output
levels
come
together
at
maximum.
(Refer
to
figs.
4
and
5.)
ee
Roh
peak
level
L-ch/R-ch phase adjustment
4 Make connections as shown in fig. 6.
5. Playback the 8kHz signal from the test tape (QZZCFM)
Adjust screw (B) shown in fig. 4 so that pointers of the two
VTVMs swing to maximum and a waveform as illustrated in
fig. 7 is obtained on the oscilloscope
Oscill
VIVM| illoscope
Playback {ine :
mode Qyt Vertical Horizontal Fig. 6
@
Tape
speed
Tape
speed
accuracy
Record/playback
head
Condition
1
Test
equipment
connection
1s
shown
in
fig.
8.
eae
*
Playback
mode
2.
Playback
test
tape
(QZZCWAT
3,000Hz2)
at
middle
section
eo]
and
supply
playback
signal
to
frequency
counter.
Test
tape
Payback
mode
Digital
electronic
counter
3
Measure
this
frequency
Fig.
8
4.
On
the
basis
of
3.000Hz.
determine
value
by
following
formula
LINE OUT
Equipment
* Digital electronic counter or
frequency counter
* Test tape --- QZZCWAT t -- 3.000
Tape speed accuracy = 3000 x 100(%) where. f -. measured value
f
| Standard value: +1.5%
Adjustment method
1 Playback the test tape (middle)
2 Adjust so that frequency becomes 3.000 Hz
3 Tape speed adjustment VR shown in fig. 1.
Tape speed fluctuation
Make measurements in same manner as above (beginning, middle and end of tape), and determine the
difference between maximum and minimum values and calculate as follows
: f:—fe
Tape speed fluctuation = 3 00. 100 (%) f: = maximum value, f» = minimum value
Standard value: Less than 1%
Note:
Please use non metal type screwdriver when you adjust tape speed accuracy on this unit.

® Playback frequency
response
Condition
+ Playback mode
* Tape selector
-- Normal position
Equipment
*VTVM
+ Test tape---
* Oscilloscope
QZZCFM
ony
fig. 3.
Test equipment connection is shown in
ITEM MEASUREMENT & ADJUSTMENT
Playback frequency response chart
RS-M226
@ Playback gain
Condition
* Playback mode
* Tape selector
-»Normal position
Equipment
*VTVM
* Test tape--:
* Oscilloscope
QZZCFM
@ Erase current
Condition
* Record mode
* Tape selector
-- Metal position
Equipment
«VTVM
* Oscilloscope
2.
Place
UNIT
into
playback
mode
aig
100
hee
7
+6d8
3. Playback the frequency response test rade Se - ee are $hc8
tape
(QZZCFM)
sae
m@annuiaeal
4
Measure
output
level
at
315Hz,125kHz
|
#8
:
2H
haa
8kHz, 4kHz,
1kHz,
250Hz,
125Hz
and
=
|7
288
ial
248
63Hz. and
compare
each
output
level
4
erie
q
foe
“To
408
with
the
standard
frequency
315
Hz.
at
eG
oon
|
eas
r
ai
This
*
rivets
LINE
OUT
200Hz
500
Hz
GkHz
10kHz
5. Make measurement for both channels ,
6 Make sure that the measured value is Fig. 9
within the range specified in the frequency response chart (shown in fig. 9).
1 Test equipment connection is shown in fig. 3.
2. Playback standard recording level portion on test tape (QZZCFM 315Hz), and using VTVM measure
the output level at LINE OUT
3. Make measurement for both channels
Standard value: 455mV+1dB [around 280 mV: at test points TP3 (L-CH) and
TP4 (R-CH)]
Adjustment
RQ
tf measured value is not within standard, adjust VR3 (L-CH), VR4 (R-CH) (See fig. 1 on page 3).
After adjustment. check “Playback frequency response’ again
Test equipment connection 1s shown in fig. 10.
Press the record and pause buttons
1
2
3. Set the tape selector to metal position
4
Read voltage on VT VM and calculate erase current by
following formula
Erase current (A) =
Voltage across both ends of R124
1 (Q)
Standard value: 155+15mA (Metal position)
5. If measured value is not within standard, adjust as follows
Adjustment
1. Open the point (A) and short the point (B) on the main circuit board in the wiring connection diagram
(See page 15).
2. Make measurement for erase current
3. Make sure that the measured value is within the erase current of 140 mA to 170mA
4. If it is beyond the value, carry out the following adjustments
* If the erase current is less than 140 mA, short the point (A)
* {f the erase current is more than 170 mA, open the points (A) and (B)
© Overall frequency
response
Condition
* Record/playback mode
* Tape selector
-- Normal position
--CrOQ. position
--Metal position
* Input level controls --- MAX
Equipment
*VTVM * AF oscillator
* ATT * Oscilloscope
* Resistor (60002)
* Test tape
(reference blank tape)
---QZZCRA for Normal
“+ QZZCRX for CrOz
*-QZZCRZ for Metal
Note :
Before measuring and adjusting, make sure of
the playback frequency response (For the
method of measurement. please refer to the
playback frequency response}
Overall frequency response adjustment by recording bias current
Note 1:
On RS-M226. overall frequency response
1S adjusted with tape selector set at Normal
Note 2:
Recording equalizer is fixed
1. Make connections as shown in fig. 12.
- 24 dB signal through
LINE IN. Place the set in record
2. Input a 1 kHz.
mode
Erase head
Record mode
=! vM Oscilloscope
Fig. 10
Overall frequency response chart (Norma!)
50Hz 100Hz 200Hz
300 Hz
500Hz LkHz 2kHz 4kHz 8kKHZ10kHz
Record/playback !
head
TP] (L-CH)
TP2 (R-CH)
R1 (t-CH)
R2(R-CH)
Ground
3. Fine adjust the attenuator to obtain
0.4V LINE OUT output.
+ Make sure that the input signal level
is 24+4dB with 0.45V output voltage
Fig. 11
VRQ (L-CH)
VR10 (R-CH)
LINE
VIVM
——
For overall frequency
response measurement
oscilloscope
VTVM FVM oscscoe
arse ears bias current measurement.
Fig. 12

RS-M226
ITEM MEASUREMENT & ADJUSTMENT
Set the tape selector to Normal, and load the test tape (QZZCRA)
Adjust the attenuator to reduce the input signal level by 20dB
Adjust the AF oscillator to generate 50Hz, 100 Hz, 200Hz, 500Hz, 1 kHz, 4kHz, 8kHz and 10 kHz
(ooo
signals, and record these signals on the test tape
Playback the signals recorded in step 6, and check if the frequency response curve is within the limits
shown in the overall frequency response chart for normal tapes (fig. 11).
(If the curve is within the charted specifications, proceed to steps 8, 9 and 10.)
If the curve is not within the charted specifications, adjust as follows,
Adjustment (A):
When the curve exceeds the overall frequency
response chart specifications (fig. 11) as shown
in fig 13.
fe ee +6dB
+
one = t ct —4dB
—t—4—f ett 608
rae
1 — gap
VkH2 2kHz 4kHz 8kHz1OkHz
Fig. 13
1) Increase bias current by turning VR9
(L-CH) and VR10 (R-CH).
(See fig. 1 on page 3.)
Repeat steps 6 and 7 to confirm
NO
(Proceed to steps 8. 9 and 10 if the curve
1S now within the charted specifications in
fig. 11.)
3) If the curve still exceeds the specifications
(tig. 11), increase bias current further and
repeat steps 6 and 7
8. Switch the tape selector to CrO:.
change test tape to QZZCRX, and
record 50Hz. 100Hz. 200 Hz,
500Hz, 1 kHz, 4kHz, 8kHz, 10kHz
and 12.5 kHz signals
the signals and check if the curve is
within the limits shown in the overall
frequency response chart for CrO»
tapes (fig. 15).
9. Switch the tape selector to Metal.
change test tape to QZZCRZ, and
Then, playback
Adjustment ‘B):
When the curve falls below the overall frequency
response chart specifications (fig 11) as shown
in fig. 14,
4 Ti+ 408
re) ttt + 208
> HOB
3 —150B
Toy ~ 208
i = H 4dB
Pree teed +t tt eae
roy | 8 dB
LkH2 2kHz 4kHz 8kHz10kHz
as, |
oe i +4 54B
Fig. 14
1) Reduce bias current by turning VR9 (L-CH)
and VR10 (R-CH).
2) Repeat steps 6 and 7 to contirm
(Proceed to steps 8. 9 and 10 if the curve is
now within the charted specifications in fig
11)
3) If the curve still falls below the charted
specifications (tig. 11), reduce bias current
further and repeat steps 6 and 7
50Hz 100Hz 200Hz
Overall frequency response chart (CrO2, Metal)
PTT
1kHz 2kHZ 4kHz uly
\12.5 KHz
kHz
0
Fig. 15
record 50Hz. 100Hz, 200Hz, 500Hz. 1 kHz, 4kHz, 8kHz, 1OKHz and 12.5 kHz signals
playback the signals and check if the curve 1s within the limits shown in the overall frequency response
chart for metal tapes (tig. 15).
positions.
* Read voltage on VTVM and caiculate bias current by following formula:
Bias current (A) =
Value read on VTVM (V)
10 (Q)
Then,
10. Confirm that bias currents are approximately as follows when the tape selector is set at different
around 350A (Normal position)
around 450zA (Cr02 position)
around 700A (Metal position)
\ measured at TP1 (L-CH) and TP2 (R-CH)
@® Overall gain
Condition :
+ Record/playback mode
* Tape selector
seanee Normal position
* Input level controls --- MAX
* Standard input level;
MIC «+--+ —72+4dB
LINE IN--- —-24+4dB
Vv
position.
ATT to LINE IN.
A
0.45V.
Using test tape, make recording.
P
OUT on VTVM becomes 0.45V.
Test equipment connection is shown in fig. 16.
ace UNIT into record mode, and tape selector to normal
Supply 1 kHz signal (—24 dB) from AF oscillator, through
djust ATT until monitor level at LINE OUT becomes
layback recorded tape, and make sure the value at LINE
AF oscillator
LINE IN
Record/playback
head
Test tape
Fig. 16
Record mode
Test tape
Playback
mode
ytym
Oscilloscope

RS-M226
ITEM MEASUREMENT & ADJUSTMENT
Equipment : 7. if measured value is not 0.45V, adjust VR5 (L-CH), VR6
+*VTVM _ + AF oscillator (R-CH) (See fig. 1 on).
*ATT * Oscilloscope 8. Repeat from step (2)
+ Resistor (600 2)
» Test tape
(reference blank tape)
-+-QZZCRA. for Normal
@ Fluorescent meter . Test equipment connection is shown in fig. 16.
Condition:
.
As
shown
in
fig.
17,
connect
the
collector
of
Q8 and peak reset terminal.
* Tape selector . Supply 1kHz signal (—24 dB) to the LINE IN
Normal position jack, then press the record button.
+ Input level controls --» MAX _ Adjust the ATT so that the output level at LINE
OUT jack becomes 0.45 V (The input level at
Equipment: ; this condition is termed the standard input Connection
+ VTVM * AF oscillator level) uN cord
* ATT . Adjustment at "—20dB"
A. Adjust the ATT so that input level is —20dB
below standard recording level
B. Adjust VR7 so that the —20dB segment >
lights up in the —20 + 1dB range (L-CH Ly
ONLY) (See fig. 18) SUTETTTTTTETT TTT ET HTT
5.
Adjustment
at
“OdB":
20
(Fak)
6
©
4+
20+
2
00-68:
A. Adjust the ATT so that the output level at Fig. 18
LINE QUT jack becomes 0.45V. MMS
(The input level at this condition is termed vesveseeaserisesisaasssersaseesecsese FOB)
the standard input level.) t SHMUOOUUQUAOUUATOL AUT A UAV ALT AT LAUUHT TUT
. Adjust VR8 so that the +1dB segment 20 (ER) pee nae -2+*0+2 00-628
lights up in the 00.2 dB range of the Fig. 19
* Record mode
Fig. 17
standard input level (See fig. 19). CC
Repeat twice between steps 5 and 6 above. i
. Adjust ATT and check that all segments light SS ITTULTUUEUUMTUUATUUUTOULCUUUU TDCI
vt Pus vrs
PIVTINERYELULASEAS EASE SOEEEEY ET
up when an input signal level is increased to 20 bah airs shee eat
10 dB higher than the standard input level (See ee Fig 20. sc a
fig. 20).
© Dolby NR circuit Dolby circuit frequency response check
Condition: @ Check of the Dolby-B type encoder characteristics
* Record mode . Make connections as shown in fig. 21.
* Dolby NR switch -+- IN/OUT . Set the unit to the record mode. (NR select switch is OUT.)
* Dolby NR select switch . Apply a 1 kHz signal to LINE IN.
++B/C . Adjust the ATT so that the output level at TP3 (L-CH) and TP4 (R-CH) is 12.3 mV.
* Input level controls MAX . The output level at pin 14 should be 0dB.
Equipment: . Set the NR select switch to B, and make sure that the output signal level at pin 14 of IC3 (L-CH) and
*VTVM — * AF oscillator IC4 (R-CH) is +6dB+2.5dB.
* ATT * Oscilloscope . Set the NR select switch to OUT, and adjust the frequency to 5kHz. The output signal level at pin
* Resistor (600 Q) 14 should be OdB. ;
. Set the NR select switch to B and make sure
that the output signal level at pin 14 of IC3 TP3 (L-CH)
(L-CH) and IC4 (R-CH) is 8dB+2.5¢B. re
© Check of Dolby-C type encoder characteristics
9. Repeat steps 1-5 above.
10. Set the NR select switch to C and make sure
that the output signal level at pin 14 of IC3 ;
(L-CH) and IC4 (R-CH) is 11.5dB+2.5dB. fate {ite (L-CH) 2
11. Set the NR select switch to OUT and adjust Ica (R-CH) EN ere
the frequency to 5kHz. The output signal at Fig. 21
pin 14 should be OdB. 9-
. Set the NR select switch to C and make sure
that the output signal level at pin 14 of IC3
(L-CH) and IC4 (R-CH) is 8.5dB+2.5dB.

RS-M226
ELECTRICAL PARTS LOCATION
Q14, 15
5-Core flat cable
White line
aa = Connector [4]
ree (Flat Cable
connecter)
Open the lid of connector G]
in the direction of the arrow
as shown above, and extract
the 5-Core flat cable to
disconnect.
REPLACEMENT PARTS LIST
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.
Ref No. Part No. | Part Name & Description Ref No. Part No. Part Name & Description
ELECTRICAL PARTS E7 QuS1961S Flat Cable Connector
E8 QJUT1090 Pin Terminal-A
E1 QWY4122Z Record/Playback Head (Test Point)
E2 QWY2138Z Erase Head EQ SJT777 Pin Terminal-B
E3 (AC Power Cord)
[D] A RJA23ZC AC Power Cord E10 NO39 Heat Sink
[For all European areas except United Kingdom.}
([B)A QFC1205M AC Power Cord E11 QJS1923TN 9 Pin Socket
{For United Kingdom.] E12 QJT1054 Contact
4 QSiFLOO6F FL Meter E13 QJS1921TN 3 Pin Socket
5 QJP1921TN 3 Pin Post E14 A QTF1054 Fuse Holder
6 QJP1923TN 9 Pin Post

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
|
!
|
|
|
|
|
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
O)—©)
S)—®)
(©)
Le
>
©
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

RS-M226
LINE OUT
METER &
HEADPHONES AMP
HEADPHONES
JACK
~~
Q8, 9
PEAK HOLD
SET/RESET
FL METER DRIVE
FL METER
YN)
—~___ $4
an | !
|
|
|
Ste)
LINE OUT
©
&
HEADPHONES
HEADPHONES
AMP
JACK
—vV,
Q8, 9
PEAKHOLD
SET/RESET
POWER
ONIOFF
~1. SWITCH
C200
RS-M226
DOLBY SYSTEM (L-CH ONLY)
Dolby-B
Encode
Refer
to
Item
©
“Dolby
NR
circuit”
of
the measurement and adjustment
AMP section to check the frequency
MIC IN Ic3 babahietes
NE654N response of the Dolby circuit in the
vRi Ics illustration.
NE652N
LINE IN (1) q
O O e RECORD
g
; MPX FILTER a i
NeTER SS
es l @
HEADPHONES (4) + > <2)
LINE OUT ar<d G)
N
ee
cE
all
@
Yl
BUFFER AMP <6 |
i (4)
3
G)
(6)
HIGH PASS FILTER
DOLBY NR CIRCUIT
FREQUENCY RESPONSE
Sy
ddNS YMd
©
Low level stage
integrating filter
Low level stage
high pass filter
TT)
i
>=
o—o—o-4
1kHz: +6dB+2.5dB
VR5
REC
EQ
AMP
5kHz:
+
8dB+2.5dB
=
Dolby-B Decode
IC3 1c5
NE654N
NE652N
METER
HEADPHONES
LINE OUT
IddNS YMd
Z|
~~ & HIGH PASS FILTER Low level stage
integrating filter
PB EQ AMP
Low level stage
high pass filter
rd
Refer to Item © “Dolby NR circuit” of
the measurement and adjustment
section to check the frequency
response of the Dolby circuit in the
illustration.
Dolby-C Encode
MIC IN MIC AMP.
IC3
NE654N
VR1
1c5
</
£
LINE
IN
0
NE652N
HIGH
LEVEL
STAGE
: -
MPX
FILTER
High
level
stage
ae
high
pass
filter
METER
HEADPHONES High level stage
integrating filter
LINE OUT High level stage
main chan signal
C—O 0
“Kr I<]
©) o—é @)
High level stage
side chain net work
Spectral
skewing
network
Low level stage
side chain net work
Low level stage
Low level stage
main chain signal
integrating filter
Anti-saturation filter
os Bs oe
ie
=
a
=o) ile
)——-©)-—®
Low level stage
i
high pass filter
Ma ta pe ig we ee le 4
LOW LEVEL stage”
DOLBY NR CIRCUIT FREQUENCY RESPONSE
kHz: +11.5dB+2.5dB $ # —
Dolby-C Decode
Ic3 1c5
HIGH LEVEL
NE654N NE652N STAGE
High level stage signal
High level stage
high pass filter
METER
High
level
stage
’
integrating
filer
HEADPHONE:
LINE
OUT
High level stage main
chain signal
TddNS YMd
XK
4sd0/0/8
High level stage
side chain network
Spectral
skewing
network
Low level stage side
chain network
Low level stage
integrating filter
Low level stage
high pass filter
Anti-Saturation filter
LOW LEVEL STAGE

RS-M226 R B
NOTES: RESISTORS CAPACITORS 1 2 3 4 5 6
ERD ECBA .Ceramic ECED ......Electrolytic
ERG ie EcGOo .Ceramic ECEON ...Non polar electrolytic SC H EMATIC DIAG RAM
ERS ..Metal-oxide ECKO .Ceramic ECQS ...... Polystyrene Bes
r ; 1, Q3,4 1C1, 2 = — Ic. fe
ERO .-Metal-film Ecco .Ceramic ECSD...... Tantalum 2SD636(R,S) 2SD636(Q,R,S) [M5219L] ovbisza73 avr 2473 INESS4N] INESS2N) INESsaN) fieeeanl faszienl 2spesein,S) 2spes6G,F.S) poncaid
ERX Metal-film ECFO...... Ceramic OCS. sss: Tantalum Main sectio OF ZSC202 (SEM, ar 262021GBSEM IMA161] {MA161] or 2SC2021SEM or 2SC20210RSEM or 2SA937PM
;
;
N
[2sD636]
[280636]
[280636]
[280636]
[286641]
ERQ ne Fuse type metallic ECQM...... Polyester film [ _ ‘tnt : —- RCT 1a 5 . 7 — ee
ERC
......
Solid
ECQE
......Polyester
film
LINE
IN
(Ly
: : :
=
(OLBY
WR
(METER
&
HEADPHONE
AMP.)
ERF ...... Cement ECOF ...... Polypropylene A t ee s2-t 52-2 B+ (bias) 7V
Ja DOE csl ay
692¥ sot ov lV
REPLACEMENT PARTS LIST MIC (L) I Ber | 1000 ; rVy — = = — @ =
Important safety notice a an tae 8 Serpe 01 , va re: i 4m bi 9s ; J LINE ov:
Components
identified
by
A
mark
have
special
ie)
WO
Faraad?
501
ik
§
oy
R161
ai
F
2060,
1c
5
Tes
lou
R95
15K
i
characteristics
important
for
safety.
Po]
os
Ff
|
AB
Ht
O_-
al
AG
rol
LA
ou
Airs
cow.
|
|
TO
a8
‘i
When replacing any of these components, use Th LC a? 483 ie | opeut. | doe o iti v- ee ae 220 ; A
only manufacturer's specified parts. are t = = Of yy Or bw <Q — 2 7 Ott ith ct Lp R
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R34 ERD25FJ101 R 136 ERD25FJ102 91,92 ECQM1H333Uz EXRP220K124T x ra Ze Y sak “oat ey £7 cn | ov a ay oor
R56 ERD25TJ104. «=—«| R137 ERD25FJ152 | C 93 (22PF) refer to Z3 B] | ws ol ene came ; ey Pal Soe ye é sl w
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refer
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TRANSISTORS
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R9,10
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R11,
12
ERD25TJ184
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140
ERD25TJ473
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98
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1,
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R13.14 ERD25Fu682 R141 ERD25FJ390 C 99, 100, 101, 102 2SD636 oak wy (Gare | cag asioT a t ae Pee] Aa ya S OF th vet |
R15,16 ERD25FJ103 ECEA5OZ1 QB 2SB641 bh gRi9 | Sai ave ao) cos] we ae of |_| n93 tao |
R 17,18 ERD25FJ680 R 142,143 ERD25TJ473 C 103 ECEA1HS100 ag 2SD636 ot | dey AY [Css ov] te 0% cgay a Laing] “7 7--=4 7 we opr | ;
R19,20 ERD25Fy392 R144 ERD25FJ222 C 104 ECFDD473MXY | Q 10 2SD592 as us zoe ae tL tet FOOD | | #68, ie oF B- (bias) -7V | f voy] L088 BP aaa
R 145 ERD25FJ103 C 105, 106 ECCD1H101K aii 2SB641 oy OFE 4 aus | es es Foiee yrles 23 10
R 21, 22 ERD25FJ182 R 146 ERD25TJ333 Cc 107 ECQP1183JZ Q 12 2SD636 : ar AG Ov] Qt | 2OKF Joy | 3 . A
R 23, 24 ERD25FJ101 R 147 ERD25FJ561 C 108 ECQM1H153JZ Q 13 2SB641 et Sa, een :
R 25,26 ERD25FJ102 R 148 ERD25TJ153 C 109 ECQM1H822JZ | Q 14 2SC1846R : sn Seay
R 27, 28, 29, 30 R 149 ERD25TJ473 C 110 ECEA50Z2R2 Q15 2SA885Q LINE IN | Y Tom —
ERD25TJ273 R150, 151 ERD25FJ681 C111 ECEA25Z4R7 J ag 2K s2c3 $21 bbb % a 14 ih a :
R31,32 ERD25FJ102 R 152 ERD25FJ103 C112 ECEA1CS221 DIODES & RECTIFIERS Js qi <i ee ia = i i
R 33 (120KQ) refer to Z 1 R 153, 154 ERD25TJ334 C 113,114 ECEA1CS331 MIC ®) aoe wlasgie® only ny at $ Lem ol fas PPS, ge ov | nso ; ;
R
34
(120KQ)
refer
to
Z
2
56
ERD25TJ683
C115,
116
D1,
2, 3,
4,5,
6
J2
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16
2
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R162
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ERD25FJ102
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ECEA1CS102
MA161
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7
ov
|
en
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ov
|
c7
css
R 37,38 ERD25TJ224 R 159, 160 ERD25TJ823 C17 ECEA1AS221 |07 LN216RP c el Ev ae Lf “om 3 A} ae ~d a i Ee is
R
161,
162, 163,
164
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R 39, 40 ERD25FJ561 , , CAGOR RIDA ‘ D 8, 9, 10, 11 Age-c91.| | caabap 22 it Roe cag, LORY J (ema Ae ~ 4 Ie aE
C 118 ECKD2H472PE MA161 | apo Fe Qu ; Re Wr: aT Rie 0033
R 41,42 ERD25Fu392 R 166 ERD25TJ683 C 122 ECEA1ES101 D 12 MA1220M C : sel sig —4 1 si) a a ST Ae ae iioegel = ¥ oe Bat :
R
43,44
ERD25FJ150
C
124,125
ECKD1H103ZF
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14,
15,
16
¢
:
ago
aony
BurER
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POR
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R 45,46 ERD25FJ562 VARIABLE RESISTORS | C 127,128 ECEA25Z4R7 A SM112 DOO ¢ vasdod | it : it Oe * seg] : ken r I Aa
R 47,48 ERD25TJ224 C200 A ECQU2A103MF }D 17,18 MA161 A 900 $+ Fay a } sg | ~~~. ; ee my a Wee) 68" Lawl fetiay
AF22A54 we 560 i Ree a ‘ H ao or “OWER c: 576Y -
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=
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ERD25FJ102
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———— ae 7 v C02, Metal + v ae v R90;
R 63, 64 ERD25FJ512 Baa eecoeaaee EXRP220K124T | IC 8 AN6870N ae ® a ee San 68K 22K aq Lc f I 27K: |
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Ref
No.
|
Part
No.
[
Part
Name
&
Description
x
rg
O
vat
lof
as
_lfdoe
[ax
waar]
ov
bee
R71,72
ERD25TI123
C9,
10
ECEA25Z4R7
ERASE
HEAD
ibe
vy
SSnav®)
20
Rg
ps
=
Be
sbi
Cl
OS
yaaa
Sid
ne
R
73,74
ERD25TJ473
C
11,12
=
ECKD1H102KB
COILS
fowye1382)
tH
C
t
uy
a7itw:
“Tovez0
1B:
(bias)
-10V
|
ov
owearoy
ous
R75,76
ERD25TJ753
—«|
C
13
(22PF)
refer
to
Z
1
So
D
:
a
a
i
R 77, 78, 79, 80 C 14 (22PF) refer to Z 2 QLQX2721D _—_— Peaking Coil ving Jv t 4 EA !
ERD25TJ394 C 15,16 ECKD1H681KB QLM9Z9K MPX Coil es Ma ac Connection point (a Sa? Salt
R 81, 82 ERD25TJ334 C 17,18 ECQM1H183JZ ELM7Q306A = Combination Coil 7 ~ radd 4 (REGULATED
R 83,84 ERD25FU821 C 19,20 ECEA1AS101 QLOQX0343KWA Bias Trap Coil POWER SUPPLY ee,
Cc
22
ECKD2H121KB
BIAS
OSC.)
"oo
am
arr
;
me
[
8+
tas
tov
|
pie
R 85,86 ERG1ANJ470 21, TRANSFORMERS cos C06 ane | Ai via | amuTING CONTROD
R87,88 ERD25TJ333 C 23,24 = ECQM1H273UZ o— eyinn : eee swt 8D a ee = .
R
89,90
ERD25TJ273
ees
SA
QLB0198
Bias
Oscillation
Coil
Pee
Malic
=
:
i
eran
|
Oe
ag
Beer
Sana
BG
Pee
vers
AC
IN
R91,92 ERD25FJ332 27,2 | -sa3tte | Re i Bey i250 ye +4 “ets A “CE
R93 (120KQ) refertoz3 | C 29,30 ECFDD223KXxY [DJA QLPD68EKC AC Power Transformer —@ g/B 94 REPS PTY BR ,, Comection ont enti AR) Inge aay wus FMB sheus | |]! deus bea | | rn
R94 (120KQ) refer to Z 4 C 31,32 ECEA50ZR47 [For all European areas except United Kingdom.] Ror 238V ‘ MURS 020" STOP ow ~Yreve20 a ou A
R95,96 ERD25FJ152 C 33,34 ECEASOZ1 [B] A QLPA65EKC AC Power Transformer ee | gnu a [ons typ rh) AS age > av ‘bona Act
R97,98
ERD25TJ224
C
35,36
ECEA25Z4R7
(For
United
Kingdom]
pt
Lio
tT
ted
$52"
$au0
i
i
asus
|
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sion)
4
|
Looe?
ae
ee
R99,100 ERD25FU151 C 37,38 ECKD1H103ZF ‘ he Ae el << nS Lenn ay ‘beni mat “uae nisi) Sh [POWER SUPPLY SECTION
R101 ERD25Fu332 C 39, 40 ECQM1H123JZ FUSES ie vio} BELED|SECTION °° § Fs0vz2 STOP OGM | Na? 680 !
-1031V MD:
R 102 ERD25TJ104 C 41,42 ECEASOZ1 F1,2A XBAQ0007 Fuse (T 400mA) E crea OY |
R 103,104 ERD25TJ683 C 45, 46 ECFDD392KVY : : . . - DE : . : -——_——_600--
j . a = 1
R 105, 106 ERD25TJ473 C 49,50 ECEA25Z4R7 SWITCHES 2SDS02ANC [LNZIGRP] 2SB641IO.R.S) 2SDEI6I0,R,S) 2SB64110,R,S) tescreser) izsageso) MatDoMTA SMIAGeT QVDIS2479. MAIOA7TA QVD1S2479 anicarom)
R 107, 108 ERD25TJ105 C $1, 52 ECEA5S0Z1 aes a , [280592] or 2SA937RM or 28c20z1GRSEM or 2SA937RM pew 5-8 [MA1220] [SM1A02] [MA161]___ [MA1047}_— [MA161]
R109, 110 ERD25FJI02 | 653,54 ECAMTHT03Nz $1 QSSE203 Record/Playback Select renee oe eoeeell wept = aon auied fucka tenes
Ri ERD25TJ153 C 55,56 ECQM1H822JZ Switch . MUTING SWITCH
R112 ERD25F.J103 C 57,58 ECEA25Z4R7 S$ 2,3and4 NOTES: ;
R113 ERD25TJ683 Cc 59, 60 ECKD1H102KB QSWX312 Combination Switch e¢ $1-1—S$1-14...... Record/playback select switch (shown in playback @ VR7 oo. FL meter adjustment VR (for —-20dB indication). ¢ All voltage values shown in circuitry are under
R114 ERD25FU222 C61 ECEA502Z1 (Input Select/Dolby position). ° FL meter adjustment VR (for 0dB indication). Unless otherwise specified, voltage measurem
R115 ERD25TJ684 C 62 ECEA1HS100 SWiDolby B-C Selector) ¢ $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, an
S5 A ESB822S Push Switch ¢ $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.
R 116 ERD25FJ471 C 63,64 ECQMIH333N2 (Power ON/OFF) MPX IN position) * Resistance are in ohms (@), 1/4 watt unl ified otherwi PLAY Vol
Aetaz ERDOSFJ472 C 65, 66, 67, 68 $6 QSR4306 Rotary Switch p . ; : 7 in ohms (8), watt unless specified otherwise. ... Voltage at playback mode.
R119
ERD25FJ182
ECQM1H472JZ
(Tape
Select
Switch)
°S4
Dolby
NR
(B/C)
select
switch
(shown
in
Dolby
B
position).
K
=
1,000,
M
=
1,000KQ.
RECIPLAY
......Voltage
at
record/playback
mo
R121
ERD25Fu103
C69,
70,
71,
72
QSB0251
FF/Rewind
Muting
Switch
°
SS...
--.-Power
ON/OFF
switch.
;
m
°
Capacity
are
in
microfarads
(uF)
unless
specified
otherwise.
Normal
.........
Voltage
at
Normal
tape
mode.
R 122, 123 ERD25FJ181 ECEA1HS100 QSB0251 Playback Switch ° S6-1—S6-4 ...... Tape select switch (shown in CrO, position). P = Pico-farads. ...Voltage at CrO, tape mode.
R 124 ERD25FJ1RO C73 ECQM1H104JZ (®...Normal, @...CrO,, @)...Metal). ¢ The mark (¥) shows test point. e.g. W= Test point 1. ...Voltage at Metal tape mode.
R125,
126
ERD25FJ392
C74
ECEA1AS221
JACKS
e
S7....
...FF/Rewind
muting
switch
(shown
in
OFF
position).
¢
(
SMB
)
this
arrow
indicates
the
flow
of
the
playback
signal.
...
Voltage
at
STOP
mode.
R 127 ERD25FJ100 é i) is Sees ; ° $8... ..Playback switch (shown in OFF position). ° ( ) this arrow indicates the flow of the recording signal. ...Voltage at Cue/Review mode.
R 128, 129 ene eee Ee as. SECOMI ESE OiAee Nerina a F * VR1,2 ..Input level controls. ¢ Important safety notice ...Voltage at Dolby-B mode.
R
130
ERD25FJ100
=
at,
ms
FCOMIF
Taiz
Pp
ac
©
VR3,4
..Playback
gain
adjustment
VR.
Components
identified
by
A
mark
have
special
characteristics
important
..Voltage
at
Dolby-C
mode.
° VR5,6 . ..Recording gain adjustment VR. for safety. When replacing any of these components, use only
C 83, 84 ECQM1H683JZ
QEJ5028S Jack Board (Line IN/OUT)
R 131 ERDS0OFJ121
manufacturer’s specified parts.

1
2
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]
[28B641]
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2SD592ANC
[LN216RP]
2SB641(Q,R,S)
2SD636(Q,R,S)
_
2SB641(Q,R,S)
[2SC1846R]
[2SA885Q}
MA1220MTA
SM1A02T
QVD1S2473
MA1047TA
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.
1
0

RS-M226 RS-M226
13 12 if 10 q 8 Z 6 5
CIRCUIT BOARDS AND WIRING CONNECTION DIAGRAM
ERASE
HEAD
[1]
POWER
SUPPLY
CIRCUIT
BOARD
BLK......
ve
Me
sib
eee
Ben
a
BLU...
RECORD/PLAY BACK
HEAD
B- (bias) -7V B+ (bias) 7V B- (bias) -7V B+ (bias) 10V
B+ (bias) 7V |
S5: POWER
ON/OFF SWITCH
B- (bias) -13V
T2: AC POWER TRANSFORMER AC POWER CORD
B- (bias) -10V
CONNECTOR EI
1 [| SIGNAL OUT (L-CH) |
B-
(bias)
2
|
SIGNAL
OUT
(R-CH)
|
—
(bi
|
-10V
[3
|
Bo
(bias)
=10V
4 | B+ (bias) +10V
CONNECTOR CAPSTAN MOTOR
[1 | PLAY SIGNAL IN L-CH
GROUND
REC SIGNAL OUT L-CH
PLAY SIGNAL IN R-CH
GROUND
“TREC SIGNAL OUT R-CH
[ERASE
“CURRENT
$8: PLAYBACK SWITCH
S 1--8RN——————————— brn
eee Ss: [o]
§-8e 5
LUG TERMINAL
reo-@6) (for MECHANISM)
S7: FF/REWIND MUTING
— SWITCH
|} N/O)) B)o|ro} a
B+ (bias) 7V
MAIN CIRCUIT
o BOARD
Connection point (A) Connection point (B)
B- (bias) —10V
HEADPHONES JACK
CIRCUIT BOARD
LED
CIRCUIT
BOARD
|
one
g
— 15— : — 14 —

RS-M226
IAGRAM
RECORD/PLAYBACK
HEAD
RS-M226
B- (bias) -7V |
B+ (bias) 7V
B- (bias)
-10V
B+ (bias) 7V
co
NNECTOR
SIGNAL OUT (L-CH) |
|
ols =
SIGNAL OUT (R-CH) |
PBs (blas)< 10M) 2s
B+ (bias) + 10V
MUTE
wlola] al
AC VOLTAGE
(to FILAMENT) j
[ELED CIRCUIT BOARD —
HEADPHONES JACK
CIRCUIT BOARD
B+ (bias) 10V
B- (bias) -13V
[J POWER SUPPLY CIRCUIT BOARD
Dito
BRN:
RED
‘ORG
T2: AC POWER TRANSFORMER
Bu
CAPSTAN MOTOR
S8: PLAYBACK SWITCH
gs | ae
lo)
LUG TERMINAL
(for MECHANISM)
ne0-@~O)
$7: FF/REWIND MUTING
SWITCH
ORG
AC POWER CORD
S5: POWER
ON/OFF SWITCH
B- (bias) -10V
...Black
.Blue
Brown
Gray
..-Green
...Light Blue
No Color Mark
.. Orange
Pink
-Red
-Shield Wire
WHT...... White
YEL...... Yellow
3 2 1
ia tes a1,2 TERMINATIONS
{M5219L] [M5219L] [2SD636] — _
1 | =0.04V (-0.02V) [ 1 [-0.03V (-0.03V) | B | -1.24V (-1.24v) STOP, CIR
2 | 0.04V (0.04V) 2 | 0.01V_ (0.01V) oe ee 0.74V
3 | 0.04V (0.04V) | 3 | 001V_ (0.01V) Cc] ov OV) OV
4 [-6.45V (-6.46V) | 4 | -6.74V (-6.73V) El 2 LONE a OV SONS]
5 [ 0.04V (0.04V) 5 | 0.01V (0.01V)
6 | 0.04V (0.04V) 6 | 0.01V_ (0.01V) spas] A
7 | -0.04V (—0.02V) 7 [| =0.03V (—0.03V) ot NER OSM tn 2
8 | 663V (673v)| | 8 | 692V (7.00V) B | OV (OV) S102 Metal
Cc [OV (OV) OV
iNEBRANI [E | Ov (OV) ov
1 OV (OV) - 13 | 6.94V (6.94V) Q5, 6
[| 2 | 004V (0.04V) ___[ 14 | 0.05V (0.02) | [2SD636]
3 | 0.02V_ (0.02V) 15 [-0.04V (0.02V) po STOP
4 | -6.32v (-6.32v) B: ~344Y| 46 | -o.05v (-0.01V) B. [20.70N. (OY) oi75v.
[ 5 | 0.08V (0.03V) 17_|-6.76V (-6.83V) | - By on oe |
[6 | 0.05V (0.02V) : 18 | 0.05V_ (0.02V) L
[7 OV (OV) 19 | 0.05V (-0.01V) Q7
8 | -0.04V (-0.01V) 20 |-0.05V (0.02V) [2SD636}
9 | -0.01V (-0.01V) 24 OV (OV) | B | 1021V (10.28)
10 | -0.04V (-0.02V) 22 ov ov) © | 20.45V (-0.30V)
11 | -0.04V (-0.01V) 23 V ( 7 =
12 | 6.85V (-6.69V) 24] OV (Ov) | EL 8ST 998M) | B
Qs
IC5, 6
9 [2SB641]
[NE652N] = B | -5.57V_ (-5.63V)
1 [-0.05V (0.02V) | 10 OV (OV) zt C | -10.17V (-10.27V)
2 | 0.05V (-0.01V) | 11 ov (OV) E = (-)
3 OV _(0.03V) | 12 OV (OV)
4 ov (OV) | 13 | 6.94V_ (6.94V) i ag
5 | -6.83V (-6.83V) | 14 | -6.32v (-e.32v) B “3 44¥ [2SD636]
6 ov. ov| 1s} ov ov) 7 bat es ey
7 ov. (Ov) | 16 ov OV) E1028 F-10540)
8 | -0.04V (0.02V) | 17 ov QV), [ites fie Nee SAV)
9 | 0.05V (-0.02V) | 18 ov (OV) il aio
IC7 ; __ [28D592]
[M5218L] B =9.89V (-10.36V)
1]. ov OV) C | -4.49V (-10.36V) ihe ay
2+}, 001V (OV) E | -10.13V (-10.36V)
3 0.01V (OV) C
4 | -12.54V (-13.20V) Qi1
2: 5 ay ae [2SB641]
. os ov, B | 1246v (13.281) {SRY
8 | 13.07V__(13.75V) C | =0.20V (-0.20V) 12.70V
[E | 12.46V (13.28V) 12.75V
Ics ac
[AN6870N] Q12
1 [-10.27V (—10.35V) | 15 [ -10.44V (—10.23V) | [2SD636]
2 | -7.72V_(-7.80V) | 16 | -10.14V (-10.23V) B ov ov) STOP
3 | 10.42V (10.64V) | 17 | —10.15V (-10.24V) | 0.64V
4 | -0.46V_(-0.38V) | 18 |~10.15V (-10.24V) C | 12.4aV (13.30V) 0.01V
5 | -0.47V (-0.40V) | 19 | -10.15V (-10.24V) | LE OV __(0V) Ov
6 | -10.15V (-10.32V) | 20 | —10.15V (—10.24V) 3
. 7 | =10.16V (-10.24V) [24 | -10.15V (-10.25V) | ened
8 | -10.15V (—10.24V) | 22 | -10.15V (-10.25V) .
9 | -10.15V (10.24) [23 [—10.15V (-10.25V) | B 12.53V (1235) STOR,
10 | -10.15V (-10.23V) [24 | -5.61V (-5.68V) 6 12i00V G107V) 12.0V D
11 | -10.16V (-10.24V) [25 | 5.28V (5.52V) | rE 172.53V (13.30v) 72. 15V
12 | -10.16V (-10.25V) | 26 | -6.87V (-6.98V)_ 2
13 | -10.15V (-10.24V) | 27 | -8.43V (-8.51V) | Qi4
14 | -10.15V (-10.24V) | 28 | ~8.43V (-8.50V) [2SC1846R]
(B | 19.16V (11.34V)
re 12.74V (13.50V)
|_E | 10.46V (10.65 V)
Q15
[2SA885Q]
B | -11.01V (-11.04V) Q14 Q15
C | -12.23V (-13.14V)
E [-10.31V (-10.38V)
NOTES: Cathode
* The circuit shown in#3333 on the onductor indicates printed circuit on
the back side of the printed circuit board. Cao—f@q—o a E
* Values indicated in[____] are under no signal condition.
Unless otherwise specified, voltage measurement conditions are the tape Di—6, 8—11, 17, 18
travel is at STOP, tape mode at NORMAL, and Dolby NR switch at OFF.
REC ... Voltage at record mode.
PLAY ...Voltage at playback mode.
RECI/PLAY
......
Voltage
at
record/playback
mode.
cao—(t}-0
A
Normal -Voltage at Normal tape mode. Ss
CrQ,.. -Voltage at CrO, tape mode. Cathode
Metal
Voltage
at
Metal
tape
mode.
Anode
STOP .... ... Voltage at STOP mode.
CIR
..
...
Voltage
at
Cue/Review
mode.
D7
Bina te ...Voltage at Dolby-B mode.
GQotvexsat in tee Voltage at Dolby-C mode.
For measurement, use VTVM. Cathode
¢
The
supply
parts
number
is
described
alone
in
the
replacement
parts
list.
|
Anode
F
¢ This circuit board diagram may be modified at any time
with the development of new technology.
Cao—fq—o A
D13—16

REPLACEMENT PARTS LIST
MECHANICAL PARTS LOCATION
Ref No. Part No. | Part Name & Description
e Front View ;
MECHANICAL
PARTS
M45
e
Rear
View
M1 QBP1874 Cassette Pressure Spring
M2 QDG1201 Main Gear
M3 QDG1202 Sub Gear M47
M4 QMB1336 Supply Reel Table Hub
M5 QDR1139 Supply Reel Table
M6 QMF2118 Fast Forward Arm Bracket
M7 QML3899 Sub Control Lever el
M8 QML3898 Main Control Lever
M9 QML3900 Record Operation Lever
M 10 QML3586 Head Base Plate Lift
Lever
M11 QML3594 Auto-Stop Release Arm
M 12 QML3603 Erase Safety Lever
M 13 QML3604 Auto-Stop Driving Lever
M 14 QML3605 Auto-Stop Detection Lever
M 15 QML3592 Change Lever
M 16 QMR2013 Record Rod
M 17 QMR2011 Auto-Stop Connection
Rod
M 18 QMR2014 Eject Rod
M 19 QMR2012 Control Rod
M 20 QMZ1283 Flywheel Thrust Retainer
M 21 QBC1357 Lock Pin Pressure Spring
M 22 QML3896 Auto-Stop Selection Lever
M 23 QBT1962 Main Lever Spring
M 24 QBN1739 Selection Lever Spring
M 25 QBN1742 Pressure Roller Release
Spring
M 26 QBN1744 Sub Gear Spring
M 27 QBN1897 Main Gear Spring
M 28 QBN1746 Auto-Stop Lever Spring
M 29 QBN1747 Connection Spring
M 30 QBS1137 Pause Lock Pin
M 31 QBC1372 Reel Table Spring
M 32 QBW2008 Poly Washer
M 33 QBT1961 Operating Change Lever
Spring
M 34 XUB3FT Stop Ring 3¢
M 35 QBW2012 Poly Washer
M 36 QXL1354 Sub Lever Assembly
M 37 QXL1355 Main Lever Assembly
M 38 QML3882 Pause Change Lever
LM 39 QBT 1682 Lock Retainer Spring
M 40 QXL1381 Pressure Roller Assembly
M 41 QBN1743 Pressure Roller Spring
M 42 QML3588 Fast Forward Lever
M 43 QBN1748 Fast Forward Spring
M 44 QMA4410 Flywheel Retainer
M 45 XSN2 + 10 Screw @2x 10
M 46 QBN1741 Change Lever Spring
M 47 XWG2B Washer 2¢
M 48 QMZ1254 Cord Clamper
M 49 QXF0199 Flywheel Assembly
M 49-1 QBW2049 Poly Washer
M 49-2. QBW2026 Snap Ring
M 50 QXD1143 Takeup Reel Table
Assembly
M 51 QXL1382 Idler Lever Assembly
M 52 QXi0111 Takeup Idler Assembly
M 53 QBT1893 Takeup Idler Spring
M 54 QxXxi0113 Fast Forward Idler
Assembly
M 55 Qxi0112 Rewind Idler Assembly
M 56 QXL1383 Fast Forward Arm Ref No. | Part No. | Part Name & Description Ref No. Part No. | Part Name & Description Ref No. Part No. | Part Name & Description
Assembly
M 57 QMK1840 Head Base Plate M 78 QDB0273 Fast Forward Belt M 97 XTN26+5BFZ Tapping Screw @2.6x5 M 117 QML3884 Lock Arm-B
M58 QM21241 Head Spacer M118 QML3888 Play Lever
M 79 QXL1360 Record/Playback M 99 QML3885 Fast Foward Driving Lever | M 119 QML3889 Stop lever
M 59 QBN1740 Head Pressure Spring Selection Arm Assembly
M 60 QBC1278 Head Spring M 80 QML3580 Record/Playback M 100 QML3886 Rewind Driving Lever M 120 QML3890 Fast Forward Lever
M61 QBCA0008 Head Spring Selection Lever M101 QML3887 Record Driving Lever M121. QML3891 Rewind Lever
M 62 QML3591 Brake Arm M 81 QBT1895 Record/Playback M 102 QML3897 Play Changing Lever M 122 QML3892 Record Lever
M 63 QMZ1240 Sub Head Base Plate Selection Lever Spring M103. QML3901 Eject Obstruction Lever M123. QML3893 Pause Lever
M 64 QMN2550 Roller M 82 QXP0607 Fast Forward Connection M 104 QMR2007 Fast Foward Connection M 124 QML3894 Muting Lever
M65 QDK1017 Steel Ball 2¢ Pulley Assembly Plate M125 QMR2006 Fast Wind Rod
M 66 QBP1873 Head Base Plate Pressure | M 83 QMK1838 Upper Base Plate M105 =QMR2008 Rewind Connection Plate M126 QMR2010 Pause Rod
Spring M 85 QDP1828 Fast Forward Pulley M 106 QMR2009 Record Connection Plate M 127 QMF2245 Operating Button Plate
M 67 QBT1597 Brake Arm Spring M 86 QXH0408 Chassis Cover Assembly M 107 QMZ1288 Connection Plate Retainer | M 128 QKJ0537 Operating Button Frame
M 68 QBT1892 Head Release Spring M 87 QDC0126 Tape Counter M 108 QMA4411 Holding Angle-L M 129 QBP1953 Operating Lever Spring
M 88 QDB0169 Counter Belt M 109 QMA4412 Holding Angle-R
M 69 QMA3858 Head Adjustment Plate M 89 QMA4439 Counter Angle ; M 130 QBN 1898 Fast Wind Rod Spring
M 70 Q2k0241 Takeup Gear Assembly M110 QDG1254 Damper Gear M131 QBW2020 Washer
M71 QXxXU0297 Motor Assembly M 90 XTN3 + 24B Tapping Screw @3 x 24 M111 QDP1920 Damper Retainer M 132 XWG26 Washer 2.66
M 72 QXK2286 Sub Chassis Assembly M91 XSN26 +3 Screw @©2.6x3 M112 QML3878 Fast Forward Change M1330 XTN2+5B Tapping Screw @2x5
M 73 QDG1199 Auto-Stop Gear M 92 XTN2+6B Tapping Screw ®2x6 Lever M134. XTN2+4BFZ Tapping Screw @2x4
M 74 QDG1200 Cam Gear M 93 XTN26 + 6B Tapping Screw @2.6x6 M 113 QML3879 Rewind Change Lever M 135 XTN3 + 6B Tapping Screw @3x6
M 75 xXwG2 Washer 2 @ M 94 XTN26+10B Tapping Screw @2.6x 10 M 114 QML3880 Record Change Lever M 136 XTN3 + 12B Tapping Screw @3~x 12
M 76 QDB0324 Capstan Belt M 95 XTN26 + 12B Tapping Screw @2.6x 12 M 115 QML3881 Play Change Lever M 137 QJT0015 Lug Terminal
M77 QDB0274 Takeup Belt M 96 XTN3 + 10B Tapping Screw @3~x 10 M116 QML3883 Lock Arm-A

RS-M226
4 5 6 1 8 9 10
u 12
ATION
e Rear View
rt Name & Description Ref No. | Part No. | Part Name & Description
When servicing this mechanism unit, refer to the disassembly notes
ping
Screw
@2.6x5
M117
QML3884
Lock
Arm-B
and
assembly
instructions
described
in
the
service
manuals
of
RS-M51,
M
118
QML3888
Play
Lever
t
Foward
Driving
Lever
|M
119
QML3889
Stop
lever
RS-M13,
RS-M14
and
RS-MO04
(RS-M24
mechanism
series).
vind Driving Lever M 120 QML3890 Fast Forward Lever
ord Driving Lever M 121 QML3891 Rewind Lever
y Changing Lever M 122 QML3892 Record Lever
>t Obstruction Lever M 123 QML3893 Pause Lever
t Foward Connection M124 QML3894 Muting Lever SPECIFICATIONS
e M 125 QMR2006 Fast Wind Rod
vind Connection Plate M 126 QMR2010 Pause Rod
ord Connection Plate {M127 QMF2245 Operating Button Plate Pressure of pressure roller 350 +508
inection Plate Retainer | M 128 QKJ0537 Operating Button Frame
ding Angle-L M 129 QBP1953 Operating Lever Spring i
aGAROILR
Takeup
tension
+15
M130
QBN1898
Fast
Wind
Rod
Spring
* Use
cassette torque
meter
45_158-cm
nper Gear M 131 QBW2020 Washer +» QZZSRKCT
nper Retainer M 132 XWG26 Washer 2.6¢
t Forward Change M 133 XTN2+5B Tapping Screw @2x5 :
or M134 XTN2+4BFZ Tapping Screw @2x 4 Wow and flutter; (JIS) Less than
Jind
Change
Lever
M135
XTN3+6B
Tapping
Screw
@3x6
*
Use
test
tape
5
ord Change Lever M136 XTN3+12B ‘Tapping Screw @3x 12 «+ QZZCWAT 0.08% (WRMS)
; Change Lever M 137 QJT0015 Lug Terminal
k Arm-A

RS-M226
Motor Unit Disassembly
1. Remove screw (A) and connection plate retainer (M107). The remove fast forward connection plate (M104),
rewind connection plate (M105) and record connection plate (M106) (see Fig. 1).
2. Remove three screws (B) and remove operation button unit (see Fig. 2).
3. Remove two screws (C) and hook at section (D) to dismount flywheel retainer (M44) (see Fig. 2).
4. Remove hook at section (E) and cord clamper (M48) (see Fig. 2), and then remove two screws (F) (see Fig. 3) to
dismount motor unit.
Precautions for Mechanism Unit Assembly
Before installing the operation button unit in the mechanism unit, pull the play changing lever (M102) of the
mechanism unit in the direction of the arrow until it is locked, and set the pause, F.F. and rewind buttons of the
operation button unit to OFF. At this time, check that all parts are installed at their proper positions at sections
(G), (H) and (1) (see Fig. 2).
M104. M105 M107
Proper
Position
(G)
Screw
(A)
e
M38,
Fig.
1
Motor Unit
/
CS M7 |
Operation
\
Re.
,
Button
Unit
Screw
(B)
Se
Screw
(C)
Screw (F)
Proper
Fig. 3
/
_” Proper
$8: OFF mode ~~ Position (H)
Fig. 2

RS-M226
REPLACEMENT PARTS LIST
| POWER SUPPLY
CIRCUIT BOARD
+ For United
Kingdom. [~~
Po |
G54
Ga?
Part Name & Description
Ref No. ant Part No.
Ref No. | Part No.
Part Name & Description
G18 XTN3+ 10B Tapping Screw @3x 10
Ref No. Part No. Part Name & Description | & 19 QGK3263_ Meter Cover
Silver Type
QGK3263Y Meter Cover
CABINET PARTS “Black Type”
G 20 QGL1177 Meter Filter
G1 QKM1535K Main Case
G2 QML3908 Eject Lever Gat QYP1110 Front Panel Assembly
G3 QKA1081 Rubber Foot “Silver Type”
G4 QKF2105 Cassette Holder QYP1110K Front Panel Assembly
G5 QBP1923 Holder Spring “Black Type”
G6 QBN 1893 Eject Spring G22 QGO2059 Eject Button
G7 XUBSFT Stop Ring 5¢ ‘ G23 QGOM0089 Fast Foward Buttom
G8 XTN26+5BFZ Tapping Screw @2.6x5 G 24 QGOM0095 Pause Button
GQ QYFO560 Cassette Lid Assembly G25 QGOM0093 Record Button
“Silver Type” G 26 QGOM0092 Playback Button
QYFO560K Cassette Lid Assembly G27 QGOMO0094 Stop Button
“Black Type” G 28 QGOMmo0088 Rewind Button
G 10 QYT0647 Volume Knob-R Assembly | G 29 QGOMm0097 Counter Reset Button
G 30 QBC1414 Button Spring
G11 QYT0648 Volume Knob-L Assembly
G12 QGT1591 Tape Selector Knob G31 QBC1187 Idler Spring
G13 QGC1231 Case Cover G 32 QKJ0547 Spring Holder
“Silver Type G33 QKJ0544 Button Rod-A
QGC1231K Case Cover G 34 QKJ0545 Button Rod-B
“Black Type G 35 QKJ0546 Button Rod-C
G14 QGC1232 Bottom Cover G 36 QGK3529K Spacer
G15 QGK3260 Side Panel-R G 37 [B] QGS2994 Main Name Plate
“Silver Type” ; [For United Kingdom.]
QGK3260K Side Panel-R G 38 QGK3286 Side Panel-L
“Black Type” “Silver Type”
G 16 QHQ1324 Screw QGK3286K Side Panel-L
“Silver Type” “Black Type”
QHQ1324K = Screw G39 QMR2026 Switch Rod-D
Black Type G 40 QMR2027 Switch Rod-E
Gi7 XTS3 + 10B Tapping Screw @3~x 10 G41 QMR2019 Switch Rod-C
— 22 —
G 42 QMR2028 Switch Rod-F
G43 QML3907 Record/Playback Lever
G44 QML3909 Counter Reset Lever
G 45 QBS1139 Record/Playback
Connection Wire
G 46 QGO1900 Power ON/OFF Button
G47 QGO2052 Push Button-B
G48 QGO2071 Push Button-C
G49 XNS8 Nut 8d
G 50 XNS9 Nut 96
G 51 QJC0054 Earth Plate-A
G 52 QJC0057 Earth Plate-C
G53 QKJO550K Cord Clamper
G 54 XTN3 + 20B Tapping Screw @ 3x 20
G 55 QTS1586 Shield Case
G 56 QKJ0548 Meter Holder
G57 QKJ0549 LED Holder
G58 XTN3 + 8B Tapping Screw ®3x8
G59 QMA4440 Volume Angle
ACCESSORIES
Ad QEB0125 Connection Cord
A2 [D} QQT3331 Instruction Book
(For all European areas except United Kingdom.}
[B] QQT3310 Instruction Book
[For United Kingdom.]
PACKINGS
P41 QPN4332 Inside Carton
P2 QPA0676 Cushion-R
P3 QPA0675 Cushion-L
P5 QPC0072 Poly Sheet
(for AC Power Cord)
P6 XZB40X60A02_ Poly Bag (for UNIT)
ARD

ORDER NO. ARD83110300S2-01
Service
Manual
Cassette Deck
Soft-Touch Cassette Deck
with Dolby B-C NR RS- Mi 226
(tees inet
Silver Face
This is the Service Manual
for the following areas.
[D]...For all European
areas except United
Kingdom.
[B]...For United Kingdom.
RS-M24 MECHANISM SERIES
Please use this manual together with the service manual for
model No. RS-M226 (Original) order No. ARD82060161C8-11 and
RS-M226 (Supplement-1) order No. ARD82100161S2-01.
PARTS COMPARISON TABLE:
Please revise the original parts list in the Service Manual (RS-M226) to conform to the changes shown herein.
If new part numbers are shown, be sure to use them when ordering parts.
Part Numbers
Ref. No. Part Name & Description Remarks
Former Type New Type
G3 Rubber Foot QKA1081 QKA1093
G6 Eject Spring QBN1893 QBN1937
G37 Main Name Plate —_—_—- QGS3094 Added
CIRCUIT BOARDS AND WIRING CONNECTION DIAGRAM
SLD
WHT BLK
Ss ——_ =>
PNK
| WHT GRY
a S.-i
PNK
Former Type New Type
| a PNK gu (Correction)
ao
MNO CNM~1000Cc0
* ‘Dolby’ and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation.
Technics
Matsushita
Electric
Trading
Co.,
Ltd.
P.O.
Box
288,
Central
Osaka
Japan
(AR D, A.H) Printed in Japan