Tascam 122MKII User manual

•
TEAC Pro f essional Di vi sion
•
;
SERVICE MANUAL
Master Cassette Deck
Effective: March , 1987 B 10124
5704035900

• .... mn..l1 I
TABLE OF CONTENTS
, . Specifications ..... .......... .... .... .. ........ ·2
..
Block Diagram ··················· · ···············3
2. Removal of External Components . . .......... ·4
3.
Parts Location ..... ....... ........... ......... ·5
4.
Test Equipment/Material and Precautions
4 -1 Equipment Required for Maintenance ... ·7
4-2 Precauti ons ···· .. ·· .... ·· .. · .. ·········· ·8
5. Mechanical Checks and Adjustments
5 - 1 Micro Switch ................ . .. . ...... 11
5 - 2 Head Hight, Tilt and Azimuth .. .......... 11
5-3 Head Base Po sition . ........... ..... ... 12
5 - 4 Pinch Roller Pressure .................. 15
5-5 Reel Torque
.......... ...... ........... 15
5-6 Tape Speed
.......... ...... .... .. ...... 16
...................... 17
5 - 8 Cassette Holder
5
-7 Wow and Flutter
........................ 17
5-9
Damper Adjustm ent
18
5 -1 0 Voltage Conversion .... ....... ...... " 18
6. Electrical Checks and Adjustments
6 -1 Playback Performance .. ................ 21
6-2 Monitor Performance ................... 22
6 - 3 Recording Performance . ........... . . ... 23
7. Exploded Views and Parts Lists ...... . . .... 25
8. PC Boards and Parts Lists ............ . ..... 34
9. IC Internal Block Diagrams
. ....... . .... ·····44
Schematic's
....... .... .......... , ... .... ...... Insert
1. {±m: ....,... ............. ... ............ ..... .. ··2
70 ';J? . ~l-1-v'f'5.b. ............ · .... ·· ........ 3
2. 9HH~~0)7l- V/J ... ... . .... . ............. .... ····4
3. $~llCIT![18l ························ · ·· · ···········5
4. ;f. /Tj-/A::E~~M·e~~H*
-
4-1.;f./Tj-/A::E~~t;f ........ · .. · .. · .... · · .. ·9
4-2. ;f. /T-j- / A~t~l* ....................... 10
5. ml~$OH· I ';J ? e ml~
5-1.-?.{?OA.{·;JT ··· ··· ········· ·· · ······· 11
5-2. ""Y rO)~~ , T'" 1-, 7:/71 A ......... .. 11
5-3. "";J P·"-";:-Alli.fi ......... ....... ......... 12
5-4. C/T' O-'5f:E¥:7J .. .......... ......... 15
5 - 5.
I) - 'v' I- ,"? ............................ 15
5-6. T-7~Jj' .... . ........ ..... ..... . ....... 16
5 -7. ']? . '7 '5 'y 7
........................... 17
5-8. :hi!.y r . *'"7'
5-9. 7'/I\~fl
18
......................... 17
5-1 o. l( EE~l~ ................................ 18
6. ~~iir¥l1J /'1'$0)7 I ':J? cml~
6-1 . ¥l~* ............. ..... ................ ·21
6-2 . =t=-7* .......... ... ......... .... ·. .... ··2 2
6-3. ~~iir* .......... .. .... ................... 23
7. )j-M[;2Jel'\-'Y'I)AI- .. · .... · .. · ...... ·· .. .. ··25
8. ~l&l8lcl\-'Y' I) A I- ......... .. ·· .... ··· .. ····34
9. IC:l'o·;J?·$f-1-v'f'5.b. .... · .. · ........ · .. · .. ·44
@]~il[;2J ... ..................................... U: {j'0.JJ

I l~~ MK ll
MECHANICAL
Tape:
Track Format:
Tape Speed:
Speed Accuracy:
Pitch
Control:
Wow & Flutter
1):
Fast Wind Time:
Motor:
Head Configuration:
Dimentions (W x H x D):
Weight
ELECTRICAL
Line Input (XLR)
Input Impedance:
Nominal
Input Level:
.
Minimum Input Level:
Line
Input (1/4" and RCA)
Input Impedance:
Nominal
Input Level:
Minimum Input Level:
Line
Output (XLR)
Minimum Load Impedance:
Output Impedance:
Nominal
Output Level:
Maximum Output Level:
Line Output (RCA)
Minimum Load Impedance:
Output Impedance:
Nominal
Output Level:
Maximum Output Level:
Headphone
Output:
Bias Frequency
Equalization:
Recording Level:
Frequency Response2 ):
Total Harmonic Distortion (THD)2) :
Signal-to-Noise Ratio2 ) :
(Reference 3 % THO)
Adjacent Channel Separation2):
Erasure2 ):
Power Requirements:
U.s . AJCANAOA:
EUROPE:
U.K ./ AUSTRALlA:
GENERAL EXPORT:
Power Consumption:
1. SPECIFICATIONS
1±~
Philips type ca ss ette C-60 and C-90
4-track, 2-channel stereo
4.8 cm/s
(1-7/8" ips)
±0 .5 %
±12 %
0.04 % (NAB weight_ed)
±0_08 % peak
(DIN /IEC/ ANSI weighted)
90 seconds for C-60
1
FG servo direct -drive capstan motor;
1 DC reel motor; and 1 DC ancillary
3 heads; erase, playback and record
482 x 133 x 297
mm (19" x 5-1 /4" x 11-11 / 16")
7.7 kg (16.94 Ibs) net
40 k ohms, balanced
+4 dBm (1.23 V)
-4 dBm (0.49 V)
30 k ohms, unbalanced
-10 dBV (0.3 V)
-18dBV (126 mV)
10k ohms or more, balanced
100 ohms
+4
dBm (1 .23 V)
+12
dBm (3.1 V)
10 k ohms or more, unbalanced
100
ohm s
-10 dBV (0.3 V)
-2 dBV (0.8 V)
100 mW/channel
maximum at 8 ohms
100
kHz
3180 J.1s + 70 J.1S (Metal, Cr02)
318011s+ 120l1s (Normal)
160
nWb/m (0 VU)
25 Hz - 20 kHz ±3 dB at -20 VU (Met al )
25 Hz -19 kHz ±3 dB at -20 VU (Cr01)
25 Hz - 17 kHz ±3 dB at -20 VU (Normal)
1 % at 0 VU, 400 Hz, 160 nWb/m (Metal)
59dB (NR OUT, WTD)
68 dB
(DOLBY" -B NR IN, over 5 kHz)
78 dB
(DOLBY-C NR IN, over 1 kHz)
Better than 45 dB at 1 kHz
Better than 65 dB at 1 kHz reference +10 VU
120 V AC, 60 Hz
220 V
AC, 50 Hz
240 V AC, 50 Hz
100/ 120/
220/240 V AC, 50 /60 Hz
24 W
- 1 -

1~~MI\J1 I
In these specifications, 0 dBV is referenced to 1.0 Volt. Actual voltage levels are also given in parenthesis.
To calculate the 0 dB = 0.775 Volt reference level (i.e., 0 dBm in a 600-ohm circuit), add 2.2 dB to the
listed dB value; i.e., -10 dB re: 1 V = -7.8 dB re: 0 . 775 V. ;Ji !; v--<lvl;l.OdBV=IV, OdBm=O.775V "C'U <o 1tl.IIb ( ) L~l
LI'tTo
1) Specifications were determined using TEAC Test Tape
OdBm=O.775V ~~ V--<lvC OdS = I vp v--<lvC Ii 2.2dB O)~/)'J;
MTT-111
':J tTo
I) : '::O)ljO)(:tHlI;l., TA f · T-7'TEAC MTT-IIII~J: ,? ,,-j-o
2): '::O)lJjO)(UlO)TA f . T-7·1;I. METAl MTT-5571
2) Specifications were determined using TEAC Test Tape
NORMAL MTT-5511
METAL MTT-5571
Cr02 MTT - 5561
Cr02 MTT-5561
-cr (:tIWLf9j.lill;t.~1§o)l:"'T~'~ < ~ T':'':: til '.!;,? t T o
NORMAL MTT-5511
-cr
f' Iv c-/ -1 X 'J ~.? Y . "Y AT" 1;1., f'lv t::--6}f~P.li/»"'O)
j[ ~ III ;:lIIi;!i~~./1.L \' tTo
f'lvc-&Lf ill {;t. , f'lvt::·-6Jl~.Ii<o~l~i!lj"L'To
Changes in specifications and features may be made without notice or obligation,
"Dolby noise reduction manufactured under license from Dolby Laboratories Licensing Corporation.
"DOLBY" and the double-D symbol 00 are trademarks of Dolby Laboratories L' icensing Corporation,
..
-2-

122MKll
Block Diagram
REPRO
HEAD
..
C=I~~uj~
@
.'-<18,., IIAL
I
L- ___ _ _ _ __ _
~ J ~ ~U ! ~
'f A.
- LOd 8"
~
@
" "0 ,;7
- IOd8v
OOL8Y N. R.
I D€COO£R I
[~T~ P1d !J
-I O dtv
--------- - -- 1
I
I
I
I
PEAK LED
vu
MEn:R
-,\':' RE C
1------,-- ~ H EAO
~
'
NORMAL
Cr02
METAL
----- -~ ~----- -- _ \ _--
~ ---- ----- -------
s c f-- -HX
PRO
100 ":1-0 R 01
L- ______________ ________ __
~
f:. ERASE
-- - -- - -U
x
HEAD
Ex te rnal Dimensions
,. ,",", 11
1 \ ,1 16"'\
19 m.-. rJ/ .. ·· 1
'2) l P'ln1"o.lll ' 6 ~ 1
I
1.-1
.'-J
ttl
r@
~
~
~
-
~ ~
y
..
-3-

l~~MKH I
2 REM OV AL OF EXTERNAL CO M PONENTS
~H~$~O)* l15
Disassemble in number-order
~{}'lfjl:$'j- L-""CT ~ L\ / .
.--
~/
,
,
I
.
,
,
,
, :
,Ql
. e: > ..
.
I
- 4-

12 2M KII
3 PA R TS LOCATION
$ J'tl ~c f1i rm
15
;
---14
---13
i---- 12
--- . 8
:\'¥- --1 0
SPEED TR IMMER
R5 02 6 16
7
11
1 REMOCON
PCB ASSY 9 METER
PCB ASSY
2
POWER SW PCB ASS Y 10 H. PHONE
PCB ASSY
3
CONTROL PCB ASSY
11
MONITOR SW PCB ASSY
4
B. T CONTROL PCB ASSY 12 REC AMP
PCB ASSY
5 PITCH CON
PCB ASSY 13
PLAY AMP PCB ASSY
6 COUNTER
PCB ASSY
14
MOTHER PCB ASSY
7 COUNTER
SW PCB ASSY 15
BAL. AMP PCB ASSY
8 VR
PCB ASSY 16
JOINT PCB ASSY, ADJ SW PCB ASSY
Fig. 3 -' Top view
.lilD ~
-5-

Record Safety Switch
B.T Sensor
Cassette-in Switch
Sensor Arm
PCB Assy
Sensor rm
./
Supply-------=:::;
Reel Table
L
_. __
~
j .. ",'J. ..... _
I
J..::;Y
E RASE Head
Head Ass'y
:;-..,....;+--------Ta ke·u p
Reel Table
f-:----Pinch Roller
Fig. 3-2
Cassette·i n Reel Motor
Record Safety
----- Red u ctio n
Pulley
Switch
-- -=---; '--
:'..=.;=:o= ~ ~.::..;; ;_..--- B.T Co ntraI
PCB Assy
Damper.,----------~
~~ ---------Cam
Mo tor
1-
Fig. 3-3
"-- --
-6-

1 1~~MKJJ
4. TEST EQUIPMENT/MATERIAL AND PRECAUTIONS
4-1. EQUIPMENT REQUIRED FOR MAINTENANCE
Equipment/Material (Suggested Type)
Used for
Cleaner
TEAC TZ-261A (Head Cleaner)
or equivalent
Cleaning heads and other meal components
in tape path
TEAC TZ-261B (Rubber Cleaner) Cleaning pinch collers
.-
Head Demagnetizer
TEAC E-3 or equivalent Demagnetizing heads
Screwdriver
Non inductive (plastique, wood) Bias tuning
Spring Scale 0- 500 g Pinch roller pressure measurement
Head Alignment
Jig Jig
A, TEAC Part No. 5736006600
Jig
B, TEAC Part No . 57 36006700
Head height checks
(longitudinal
and horizontal)
Torque
Meter
Cassette torque meter
0- 100 g-cm (Sony model TW2111 /2121)
0-160 g- cm (Sony model TW2231)
Reel torque measurement
Wow/Flutter
Meter
General use type
Range: 0. 03 %
Sensitivity: 10 mV or more
_ ..
Ava i lable positions: NAB, D/N / CCIR;WTD/UNWTD
Wow and Flutter measurements
,
Frequency Counter General use type
Sensitivity:
25 mV or more
Impedance: 1 M
ohms or more
Ra
nge: 1 Hz-1o MHz
Tape speed measurement, Wow/flutter
measurement,
and Bias frequency
measurement
DC Voltmeter
General use type
Digital or analog
Sensitivity:
0.1 V or more
DC voltage measurements
AC Level Meter General use type
Level range : -80 dB - +40 dB
Impedance: 1 M ohms or more,
less than 25 pF
Frequency range: 30 kHz or more
Signal level measurements and bias
adj sutments
Oscillator
Available frequencies : 10 Hz - 1 MHz
Output
level: 3 V or more/6oo ohms (variable)
Distortion: less than 0_1 %
Test signal generation
Attenuator
General use type
Attenuation:
100 dB or more
Steps: 0.1 dB
Impedance: 600 ohms
Input level settings
Os c illoscope
General use type (2 chan n el)
Sensitivity:
20 mV/DIV or more
Sweep rate: 1 J,1sec / DIV or more
Head azimuth adjustment
Distortion
Meter General use type
Frequency :
400 Hz, 1 kHz
Sensitivity: 10 mV or more
Scale ra nge: 0.1% or wider
Output distortion check
Band-pass Filter General use type
Passing band width: 1 kHz(±lo %),
30 dB or more /octave
Weighting : IHF
Erasure and Crosstalk measurements
-7-

122 M KB I
Equ i pment/Matenal (Suggested Type) Used for
Test Tapes
TEAC MTT-
l11 (Part No. 4900010100)
Tape speed and
..."ow/flutter
measurements
TEAC MTT- 150 (Part No. 4900011100)
(Dolby-B type) Output level adjustment
TEAC MTT-256 (Part
No. 490005090)
DIN reference le vel
Time constant 3180 + 120 ~ sec .
31.5Hz-14kHz
Head azimuth and Frequency response adjustment
Blank Tapes TEAC MTT-5511
(Pa rt No.
4900041700 )
(NORMAl)
Test signal recordings
and others
TEAC
MTT -5561 (Part No.
4900041900) ( Cr02 )
TEAC MTT-5571
(Pa rt No. 49000 42000)
(M ETAL)
Mirror Tape TEAC MTT-902 (Part No.
49000 15200)
Tape tra
ve l check
4·2. PRECAUTIONS
1. Before making any electrical checks and adjustments, be sure
to clean and demagnetize each head and tape path; and
also make sure that the tape runs smoothly.
2. Repeat checks and adjustments for Land R channels in
this order except otherwise specified.
Note: Adjustment pot numbers indicated as ROO/ROO refer
3. to channel L and channel R circuitries, respectively .
In this manual, O.dBV is referenced to 1.0 V.
-8-

I "1~~ MK JJ
.mt
M
(m::it6'o)
§
~1
7 ') - -=- /7 ' ;i'9.
TEAC TZ-26IA;?l/
(" 'j
1-'7')-1-)
.HJ:U'f6J~
c
0"
,..."" ''/
1".
7-7"
j-i -(
1"[§j0) 7 ') --=- /7'
TEAC TZ-261 B;i'9.
(7/\- . 7
I) -7)
.HJ:U'f6]
~c
00
t:'/7
o - 7 0) 7 ') - -=- / 7'
-... ../
I-'
-(1..- -"1"
TEAC E-3.H J: U' iEJ ¥J c "c
-... '/
~.
7-7
jf1
I-'O);ili!itl
r 71 /' -
~~f,~'I1:
(7' 7;:Z 7 '/7 .
*~)
"-(7;:Z
7"'---=-/7 '
'ib'ff
0~500g
t:'/T
0-7 r± . ip.l:it
-... '/
I-' ~ C' RJ!J~ ffl ;5~
;i:~ A ( ~¥ 5736006600)
;i:i ~8
( ~o ~ 5736006700)
-... ''/
1-'0);i)C'.
f:4: IiUII~
~ )1.-7 ;J -7
jJ -t '/
~
~ )1.-7
;J- 7
O ~ IO Og -cm ( '/ -=- - ~ T W2 111 ,2 1 21 )
o~ 160g-cm
('/ -=- -~ TW2231)
I) -)t.- •
~ )t.- 7
'7'/
77 '/7
;J-
7
-If ~ ffl
1..-/::;
• O,03%~
!'§ffl' I
OmV t:J. J:.
~Hf'I' 1 • JIS. NAB,
DI N/ CCIR
WTD/UNWTO
'7'/ 77 '/ 7 ;ftll:it
1~);IHll . ;1)'// 7-
-1iI ~ ffl
~ffl'
25mVt:J.J:.
-1 / t:' - 7' / ;:z
1 M 0 t:J.J:.
;~IJ ~ if-LEi;~ • 1
Hz ~ IOMHz
7-7 "
;:z e' - I-' ;~I j :it
'7'/ 77 '/ 7 ; ~IJ:it
/, -( 7 ;:z }t!~I~LEi ~~ ;~ I , ~
i~L liL 1; tt !t -JUffl
T::; 7 )1.- ;I' t: ,;I: ? TO 7' i\
~~
• 0 1v t:J.J:.
lI B:;lI
li
iE
AC '
L-- '"' )I.-~t
- jij~ ffl
1..-/::;
- 80d8~ + 40dB
-1 / t:' - 7' / ;:z
1M Qt:J.J:., 25pFt:J. T
J~");}1Z ;ii,* j~ • 30kHzP.l.J:.
i~-l5- I..- '"' )I.-;.~IJ~
/\1?;:Z ~Jl
>f - 7'1 >f }t1~~
I! LiH~ • I
OHz~
I MHz
t±lhl..-,",)I.-
3 Vt:J..l:./ 600 Q
(Cf7£ )
U9'h$ . 0.I%t:J.T
J...h fg-l5-
7' '/7",-7
-ffl ::! ffl
;Jit RII: . 100dBt:J..l:. -
;:z 7 '/ 7' • O. 1 dB
-1 / t: ' - 7' / ;:z
• 600 Q
J...hiE-l5- L-- '"' )1.-~ltJE
>f :/ o;:z::::r-7'
-~ 9: ffl
( =fJt~ )
~~
20mV/DIV t:J.J:.
a~ISi'fFe'
1
iJ. sec/DIVt:J..l:.
-... "/
r
?::;7;:z ~!l
u9'",.*~t
-~ ~ ffl
J~L Ei;~ • 400Hz, I
kHz
~~
10m Vt:J.J:.
;~ IJJE n lID • 0.1 %t:J..l:.
dj h i= ~O) U 9''''' If' ; ~ IJ ~
-9-

122MKll I
I" / 1" • I " :A . 7 -{ )" ';1
-il \i: !fI
,,*J-'.'( • I kHz
(±IO%)
30d8 tLI:. / OCT
"*~
• ~t.~tm.i::EIHnJl.ft,
;j!j $, ~* ; ~I J ;t
'7 D:A I' - '7 JIJ ;t
0:'5-''T-7'
TEAC MTT-902 (49000 1 5200) 'T-7 ' ~HT
'T:A I'
' 'T -7 ' TEAC
MTT-II I
(49 000 10100)
'T - 7"i ~.oc,
'7'7' 7 '5 "/';1 !f1
TE AC MTT- 150 (49000 II 100) ; Dolb y 8- Type
L-- "- )" ffl
TEAC MTT-256 ; DIN Ref. Level,
(4900 050900)
1l;'f;t~9.3180+ 1 20/-L se c
31,5Hz~14kHz
"' .. / 1" ), ::;7:A ,
mLIt !j& f;'j 'tt !fl
TEAC MTT-5511 (4900041700)
TEAC MTT-556 I (
4900041900 )
TEAC
MTT-55 71 (4900
042000)
7e '5 /7
' 'T - 7" (NOR MAL)
7''5/7 ' 'T-7 ' (CrO, )
7 " '5/7
' 'T-7'
( METAL)
4-2 ;J. :";TT:";A~*{!:j:
1, 7 /1 f.~O)iJ;(j f:to )'i .z I;:. , i~~ A, '/ ~' , ii\1'fA,/ ~, T-
~ ~ft $* ~h¥h~~ 0MmL, 1 0-+~~ m~ L~
T - ~ JtlT jjl:f!.~H1U?c?'9 60
2, 'f1fU~:<EO)Jilt\'\llNIJ, ~ ~&UT .T.'/11;j,L - ch, R-c h o)
m ~f'f:~;'['" ~-y; ~ "o
t.!.lROO/ROO, ROOO / ROOOo).J:. ?1 ::' ~c~h~ ,\ 6@ ~I\ifl:>'i
Ii L - ch/ F - ch ~.7J ; L i 90
3, OdBV = I, OV
- 10-

head tilt adj,
(Refer
10
I 122MKll
5. MECHANICAL CHECKS AND ADJUSTMENTS
~1.RB(J)T.I. '/ -7 C ~~
5-1 MICRO SWITCH
1. Prepare a standard cassette shell with the record protection tabs
in place.
2. Load this cassette and close the cassette holder.
3.
Adjust mounting position of the two micro switches, cassette-in
switch (S502) and record safety switch (S501) . (for switch
location, refer to
Fig. 3-3, so that the actuator position is in the
setting
range shown by Fig. 5-1.
4. Be sure that the cassette-in switch is properly actuated to start
the capstan motor.
5. Make sure that the record safety switch is properly actuated so
that when depressing the RECORD button together with the
PLAY button, the deck is set in record mode (or can not be set
in record mode if the cassette loaded has no tabs).
sensor arm
-\!/-Ij--7-b
actuator
7'J;F"I-9- =
micro switch
71'JO:A1'y;F
7
fi xe d screw
fID~:1<>
Fig. 5-1
5-2. HEAD HEIGHT, TILT AND AZIMUTH
1. Set head check jigs A and B.
2, Adjust height adjusting screw A shown in Fig, 5-4 so that tip of
non-marked side of the jig B does not touch the guide of the
rec/PB head, but the red marked side touches the guide.
3. Apply jig Bto head and check for tilt. (Fig . 5-3)
Adjust tilt adjusting screw B (Fig. 5-4) as required. After com-
pletion of the adjustment, make sure the head height adjustment
is not upset, using the step 2 above.
4. Adjust P/B head azimuth by adjusting screw C referring to item
6-1.
Adjust rec head azimuth by turning adjusting screw 0 slightly
referring
to item 6-3.
After adjustment, repeat steps 2 and 3.
head check jig B
(5736006700)
Fig. 5-2
- 11 -
setti ng range
t·y T -I /;f iell!J
= \
P''''~'
O,5mm
adjusting screw
""
IJ!lJH:)
5 - 1 7 -1 ? 0 • A -1 ':J =f-
l .• M*~~m~JM~~~~t~~~m.~60
2. ::...~~t''J ~~~-CIuL , ~t' 'J ~. ;t;)v:7 -~ ML::60
3. ~ t ''J H / . 7-.1 'd '- (S502), ~llIlJj~ 7-.1 ''J f- (S501)
;It ( jj!jj7-.1' 'Jf- llJ(f1@lpJr'i12l3-3~~oo.L 71f-.:2
I
-:7
t'l. ~ t;' ~5-1 ~t ''J T 1 / 1'lliliiHli1'l!.:tJ 6 J:. -) 1.:7-.1' ''J f-
IIlH1t'l.iiiH~~~ 6 0
4. ~ t ''J ~ 1 / • A1 ''J f-IJ' il L < friJllJ L -C .f- -V 7' 7-. .y / •
-t-- :71J (@]!\i[;~ 61J ' U1f.[r.~ 6 0
5, i1<~llJJ J tA1''Jf-IJ(iEL<fFijli)L-C, REC ORD10c 7' l/1
fiD~-ml.:jffl~c, U1f~I':~*iJ'-C~6.o, ('1t ~ (;l.~i~~
~JJJl:m 'J J iJ'fil '-C l' tJ l' ~ t ''J r i;-g-C Iv~~ .g-i': Ii iii
Wf-c~ tJl'i)') O1fW~ 60
5 - 2 "'" ':J H7) ~ ~, =f- Jt" ", 7:; 7 A
1. A... ''J F ' ~t'l. Ii1 ~~m !"l, A. B ~t ''J ~ ~ 6 0
2. mAB~Mm~-C~B~A...~~~h1~~~~~~?-1
!lllj-ctf1 r:"':~6J: -) I.:12!J5-4 ~A...';; r" ;~~;f ,) (A ) -C
~~i!'it ~60 ( ~5-2 )
3. mAB~A...,;t H':~-Cf-Jl. · rH[ ~r,- 960 (~ 5-3 )
i'1nI~'i*) (B ) cfft,i-)o (~ 5-4 )
~ ~~j'TtJ"? t.:.j&, ~ ~ ;b'H;btJ.o,"? t~ 7-. T ''J 7'2 -cfJ'fLr.
''J 1~60
4 . fJ'f~A...''J F'~7)?A'i6-1~'':VE"?-c~ ~ -i',) (C)-C
1ltJ -) 0
~ilA...''J ~'i6-3~I':VE"?-C~~* :/ (D) -CfftJ-)o
mJ~;f') (0) lili.o,tJ@)$l:; (! @)ij',z;) -C J: l '0
mJ~H'TtJ"?~j&I;L 7-.T''J72~~~, 7-.T''J7·3~f-)[..
~ -2:-fJ'ff-:r. "; 1 L -C < t:"2':l "0
head check jig B
(5736006700)
Fig. 5 -3
scr
ew
Fig, 5-4 )
head check jig A
(5736006600)

122MKll I
REG Head Azimuth Screw 0
P/8 Head
j"Ij1:"." r
REG7:/7A!P.J~::j<:;
1350 180
0
(out of phase)
i$.tl.:f€l
P /8 Head ----*<
Adj. Screw Tiit 8
Azimuth Screw G '---+-----'I--~
T)~ ~ I!llU *:;
P /87:/7 A Iil1 ~ ::j<:;
REG Head Fig. 5-5
Ui>;l'''"-" r
Fig. 5-4
5-3 HEAD BASE POSIT ION
5 - 3 A.. 'Y 1" • '" - :;z {~ ~
5-3·1 STOP MODE
5 - 3 - 1 :;z r ." 7' . 'I: - r' S;f
1. With the. deck in STOP mode, adjust the trim pot R547 (Fig.
,. ;Z r 'J 7'· -E- r' 6;'f I ::, A..'J r' . .r-(-;zt h ,& LT:1JI :: < 0
5·3) so that the head base comes to the lowest position.
J:.-51:::f-~;:EtlUJ'i:R547 (~5-6) ~ ~~- r 00
2. Turn the reduction pulley (see Fig. 3-3) with your hand to check
2. i.!'!i.:i!E7'- I) ( ~ 3-3 $ @.) -'2:-.f--C@]ti6-t±", A..:; r·.r-(-
whether the
head base exceeds the lowest position adjusted
above or not.
;Zb ( J::.~2(.T)iJ3J ~ ilL iil J:.1J ~ GI::T"- < 0b'c. -5b ' li rW !'-r 00
3. If it does, adjust R 547 again .
3. :blT"-<0J:.-5
tj.Gl;t:,
R547-'2:-2'GI:: ~ ~ 9" 00
4. Repeat steps' through 3 until a good result is achieved.
4. 1~3J1iH:i:IJ~l""[, *j!j~!Udl! .< tj.0J:."3I::9"io
5. Operate the deck in the sequence of PLAY, STOP, PLAY, and
5. f v -{ . -E - r' 1.1 ' G;z r 'J 7" 'I: - r, i- L ""[ f v -( . -E-
finally power-off modes. Repeat this sequence two or three
r'b' G 'iUitll -'2:-1:;J]0HtfF-'2:- 2,3 OC ~ IJ iZ9" 0
times.
6. 5XjjH~7i&, A.. :; r'· .r-(-;Z(.T) ~ llilL !iti -'2:-~ 00 b L, 3
6. Then observe the stop position of the head base. If the head
J1i-c~'fIi2: nt: itz.iU J:. I) TI.: <0 J:. -j ti G 1;1'- R547 -'2:- 2: G
base still exceeds than the position in step 3, readjust R547 and
repeat steps 1 through 5 until the head base comes to the lowest
1:: ~,,~ L6;:I::l ~5J1iH ~'JiZl""[, A.. .. ; r' ·.r-(- ;Z /)'UiL
position. T I:: <0
J:. -j I:: 9" 00
5·3 -2 F.F./REW MO DES
5-3 -2 F.F ./ RWD'I:- ra~
1. Run the deck in the F.F. (fast forward) or REW (rewind) mode 1.
F.F ( !f!iiS 'J) ~ U;I: RWD (!f! ~~ U -E- r' CPI :: n (.T)
and adjust the trim pot R544 (Fig. 5-6) so that the following
tJ\~tJ{1~ Gn 0 J:. -5 1:: ~ ~ IlIl~t1 UI[ R544 (egj 5 - 6) -'2:-mJ~9
two conditions are obtained. {)o
a) A clearance between brake drum and brake pad ("A" in Fig . '
J"v-;j:- · r·'5Lc 7v -;j:-·/ {,/ I~O)9"~ n JJ (~5 - 7 0)
5-7) of approx. 1.5 to 2 mm .
b) Head base should not go too far up (so the heads do not A )
b{*~ 1.5mm~ 2mm -cas 0 ~ Co
touch the
moving tape, and quick braking action is possible). A..:I
r'·.r-(- A i;l:""[ g; 0 t::ij" J::.:1J A.. rrb,tj.l' ~ C .... tE il'
2. Repeat switching operations from the STOP mode to F. F. or
go(.T)T-7'b<~A..J r·'::~Gtj.l, tl( t § -'2:-i!} ~ p" 7:;J:.U7
R EW mode two or three times and make sure the above adjust- l/-;j:-(.T);7
-{ ~ / j'-'2:-c g; o t:: ij"Ef. < 9" ~?'~o
ment is satisfied. 2,
;Z r 'J 7' . 'I: -r'tJ' GF,F .. ~ t: 1;1: RWD '1:- r·",,-(.T) i;7]~ ;{,
~fF-'2:- 2, 3 1jt ~1J ~LJ ::f, 2(.T)ifnlTl-'2:-f,li1jg L n'0 N "fW :'9
00
- 1?,-

I 12 2MKD
R537
R546 R547
TAKE-UP CUE
R544 R545
FAST F. PAUSE
Fig. 5-6
-13 -
5-3-3 PAUSE MODE
1. With the deck in the play mode, check that there is clearance of
0.5 mm or more between the pinch roller arm and the spring arm
("0" in Fig . 5-8J.
2. Set the deck to PAUSE mode and observe the clearance between
the
pinch roller and capstan shaft ("8" in Fig. 5-]). It should be
0.5 mm or more.
3. If not, adjust the trim pot R545.
4.
Repeat switching operations from STOP to PAUSE mode two or
three times, and make sure that when repeating steps 1 and 2,
the clearances "0" and "8" are within the specified range
respectively. Also make sure there is a clearance between head
base and spring stud ("e" in Fig. 5·B).
5- 3-4 CUE MODE
1. Load a prerecorded tape.
Make sure cue signal is developed when the FF or R EW button is
pushed with the PAUSE mode set. If the cue signal is not devel-
oped or the level is excessively low, adjust the trim pot R 546
(Fig. 5·6).
5-3-3 ;f,-;;(. '1:- f:"i!\'f
1. -.1 v l' . 'C- n: L l, t' './ T • 0 - '7 . 7 - L c :A 7' I)
'./1/" 7-L0)9~F"jJ (~5-80)D) ;I)'~;10.5mm0...tlJ:,
7.>;I) ' E1li~r.9 .00
2. ;f-;Z"'E--r'0)1fIH:t''./T"O-'7c4-t ' 7':A:$''./ " './
,.7 rO)r,,91lAA (~5-70)B) ;I)'1f.10.5mm0l:.-CJ:,7.>;I)'Mm~
97.>0
3. bL?'j.nn\.o~i5"I;l:, *[?Dfi'tllmR545c~1-t9Qo
4. :A r':J 7'" 'C- r';I)' G;f-;z" 'E-- r·-'"'.O)!;JJW!;ttilfFi- 2,
3~~IJ~U.:1!Z, fl)jtl, 2 J.]jO)T~·:J :7i-Ll, r .f1~ Dc
B;I)'i-ni"nmfi'iilllJ;I),f,«m9.oo "£ t.:, -'"'. -;; l-'" r;: - :A c
:A 7' I) './ 7'5(ttc O)Fs'] (~5 - 80) C) ~: 9" i)dk91i'j) Q ;I)'li'(i
W9Q o
5-3-4 =f-.::>.-' 'E-- F'
1. Uf§-~7j.O)T - 7'i-IrliA 9 Qo
;f - 7.' " 'E- -r'1: Ll F' F' ;f yo './"1 t.: 1;;1: REW;f. yo './ i- jIjI L
t.:MiI: =f-.:L - ~~1i' tJj Q;I)' c' -) M«t ~. r , 9 7.> 0 4-.:L - ~-l'j 1i'
tJj t H\;I),;l: t.:!;l: {g ~ v r;: )t-.tJ'~H I MI:{rl;~'l.f!; ~ (;l: , ¥[i!!JJ.E m
ttR546 (f;6J5-6) i-iJ.'iJ1 ~9 Qo

122 MK H
A: (approx. 1.5 ~ 2mm) during F-F or REW
A : O~ 1.S-2m m) F.F.xl<t REW 'E- 1" 1J;'j
H ea d base should be in the
lowest posit ion during STOP mode
~7~ ' ~ - ~ ~~~77,t-~ IJ;'j~~tT~~<~~~
Fig. 5-7
c: during PAUSE mode
Pinch roller arm
t' / 7-0-57-i.
C: ;i(-A ' , t- H<¥
Pinch roller spring
-~ 7') /'1
Fig. 5-9
t'/7-0-5
Fig. 5-8
Spring arm
~7'.J /'f7 -.L..
-14 -

right reel table
tab ®
7'1
I 122 MK JJ
torque adjusting ring
~ Jv? !P-Jyl) './";/
Fig. 5-10
51 ~ I) -Jv7'-7Jv
-15 -
5-4 PINCH ROLLER PRESSURE
1. Pushing up the cassette-in sensor arm (refer to Fig. 3-2), activate
the
play mode. Keep the sensor arm pushed up during measure-
ment.
Note: 0
uring play operation, make sure there is a clearance of
0.5 mm or more between the pinch roller arm and the
spring arm. Refer to Fig. 5-8.
2. Hook a spring scale to the small opening on the pinch roller arm.
3. Pull the scale as shown by arrow until the pinch roller moves
away from the capstan shaft by approx. 2 mm, and then allow
the
pinch roller to just touch the capstan shaft again .
4. Read the scale when the pinch roller just starts to rotate. The
reading should be from 350 g to 500 g (12.3 Oz. to 17.6 Oz.l.
5. If the pinch roller spring (Fig. 5-9) was replaced for repair,
always position the spring around
the lower half of the spring
shaft
as shown in Fig. 5-9.
5-5 REEl TORQUE
5-5-1 TAKE-UP/BACK TENSION TORQUES
1. Load a cassette torque meter in the cassette holder, and run the
deck
in play mode_ The meter reading should be:
Take-up torque (right reel table): 47 to 53 g·cm
(0.65 to 0. 74 oz·inch)
Back tension torque {left reel table}: 9
to 11 g-cm
(0 . 13 to 0.15 oz-inch)
2. If the back tension torque is out of limits, adjust the trim pot
R116
(Fig. 5·6).
The adjustment should be made about 15 sec. after the reel
starts rotation. Read the torque meter for about 5 sec. after
completion of the adjustment.
3. If the take·up torque is out of the limits, adjust the trim pot
R537 (refer
to Fig . 5-6).
4.
If the take-up torque is still out of the limits, adjust the torque
adjusting
ring provided on the right reel table. The torque can
be adjusted to three values as shown in Fig. 5-10. Turn the
torque adjusting ring with the tab ® ' pulling slightly upward,
and place the tab on one of three stepped portions having pawls
to fix the tab .
5. Repeat steps 2 and 3 until good results are achieved.
Caution:
In each trac k measurement, a cassette type torque
meter
is used. The torque meter should be calibrated
with a reference
dial type torque meter.
5-4 c:/:r' D-5ff7llr:7J
1. tJ-t!"1 r1/·-t!/-+J--·7-1.,. (~3-2~!RO ~1::;!)'':
jfp V(, 7v1 . 'C- I"I.:g-;;,o ill'j:iE$, -t! /-+J-- • 7-
1.,. li1::;!)I.:J!II Lf.;W;;, :. c!:: 0
ff!(: 7v1' 'C- ""$, to/7' 0-5' 7-1.,.c!::7../')
/ 'i' • 7 - L.Fa9'=¥J O.5mm 01:0)g- ~ ItfliJ<j);;' 1-l'li 'Gir.i2 ,g- {,
(~5-8~ffll)0
2. to/7' 0-5' 7-1.,.O)/J\~l\1\'':/'*~~/!Ht;;,o
- 3. C:'-7' 0-5iJ<4--I"/7..:9 /. ~-I" 7 riJ ' G*"J2mm~~h
;;',,1: -) '.:ff~9<:EI]O):;!)iDJI.:~I~-:,f:l~L t°:'-7' D-5/)<
~lf4--I" 77..:9 /. ~ -I" 7 I' I.:tfiMg-;;,,,I:? 1.:11#<1:[ I.:~g-o
4. t·:,- 7' 0 -5 /)<@I1) Ii ll6 {, MjO){jj[ HJi:t.'o iJl'j~tu)i(;l:350
-500gO)~ItIlA'':}..;;':' C!::O
5. {,L~E!!.O)t,:I6'.:t·:'-7·0-5';A/') :'-'i' (~5-9) 0)
XW!~ L t:I~Hi, £'9~5- 9 0),,1: ? I.: 7.. 7' I) :,- 'i' ~ 7.. 7° I)
:,- 'i ' • ~ -I" 7 I' 0) TOlin.: {iLtili ~ -t±- ;;, 0
5-5 I)-lv' r-lv?
5-5-17-1'.77 ·;/ /' 1')"'.7//\,;/'.7. 7-/:/3 /. 1')"'.7
1. fJ -t! 'J I' • T-)":$" -I': tJ -t! ';J I' • 1')[,, :1 • } - :9 ~~ C A.
j&, 7'v1 ''C- "'I.:g-{,o .!.l'l:rEi~'if1::O).ir1il)cg-o
T 1 'i 7 ':J 7'· 1')[" 'i (;fi I) -)["-Ei): 47- 53 . em
I' ';I 'i • T / ~ 3 /. 1')[" 'i (;t I) - )["-Ei) : 9~ II . em
2. I' ':J 'i T / ~ 3 :,-. 1')[" 'i /){t~:iE figiJ' G 7i-h c l \{, ~A Ii
*~:iEHlI1i:RlI6 (J;ZJ5-6) ~ ml ~g-{,o
f, ; Il!1t li7..:$'- H t"J15fY t:?-C/)'Gm.J1~g-~0 it:, :CO)i
i O):l*li~ m 5 f») -n«n,ll, g- ~ 0
3, {,LT177':J7·· t-)[,,:I/)~mfE{@/)'G7i-t1.-C~\{,~i~"i,
*~ AEHll1i:R537 ( 12?J5-6~fffi ) ~~~g-{,o
4, {, LT-1:17 ':J 7'· t-)[,, 'i/)~ ~'.:m:rEiU'G7i-h-Cl\{,:l£l
~I;t, :5
')-)["-Ei'0)
r)[,,'i mJ~ l) /'i'H§JLc ~~ -g {,o
I' )[,,'i li~5-101.:~g-"I:? 1;::3%i:~I.:mJ~cili {,O I) -)["
-Ei0)?-tJO)j);;,glb1t':: ' IH.li:lliHI~5H.: ':J} iJ~~lt Gt1.-C~\
{,OYc\ ~~ M{I':'i:97·A~f1f-t;,1:'f~"I:?I.:Lc r)[,,'i
~~~ I) :,- 'i' ~@Ig- 0
5. 2, 3JfjH~I)~Lci li :i@ t-)[,, 'i ~*I6{,o
;.i, ~: :c h-'C~1.O) I' -7 ';/ 'i Ii tJ -t! ') I' :$' 1 /0) 1')[" 'i } -
:$' -TiM:rEg- {, 0 iJl'jAEg- {, ilIl I':, t~~:$" 1 7 )["lliI r )["
'i} -:$' -T~lE L -C.:lO <a

122MKD I
5-5-2 F,F.lREW TORQUES
1. Load a cassette torque meter in the cassette holder and measure
starting torque for both F.F. (fast forward) and REW (rewind)
operations with the tape wound
close to end or rewound close to
beginning, respectively.
The reading should be:
F.F . torque (right reel table): more than 55 g-cm
(more than 0.76 oz·inch)
R EW torque Oeft reel table): more than 80 g,cm
(more than 1.1 oz-inch)
5-8 TAPE SPEED
1. Connect a frequency counter to either one of OUTPUT jacks.
Fig. 5-11.
2. Depress POWER switch to ON.
3, Load a TEAC MTT · lll test tape containing a 3,000 Hz test tone,
then
leave the deck for at least one minute to warm up the
capstan motor.
4. Playback the test tape, and make sure the following values are
obtained at the beginning and at the end of the tape.
(PITCH CONT SW: OFF)
Deviation.: 3,000 Hz±30 Hz
PITCH CONTrol range : More than ±12% for the speed when
(PITCH CO NT SW: aN) PITCH caNT is set to off.
5. If the speed is out of the limits, adjust as follows:
a) Clean the tape path and check the pinch roller pressure and
take·up torque.
b) If they are normal, push PITCH CONTrol (off), and repro-
duce approx. the mid portion of the test tape_
c) Adjust the speed trim pot R502 (refer to Fig. 3·1) provided
on the rear side of the PITCH CONTrol switch using a small
"-" driver with the handle completely insulated from the
blade to obtain a 3,DOO Hz ±5 Hz reading on the frequency
counter.
oscillator
0
~~
0
attenuator
Lt~~~o
LINE IN
Fig, 5-"
- 16-
5-5-2 F.F / RED I--JV?
1. h1::';1 1--' ;i;)[,,;)1,=h1:: ';1 1--.1--)[,,:7. J. -;)1'2:-li<-Clvl,
F.F.C!'f!i!IJ) illIJfF O) ~mJJ r)[" :7 '2:-7-7 '0)~rtlJilI<-C,
~ t:.. RWD milftO)jfj;ruJJ r )[,,:7 '2:-T - 7'O);IJ;!tIJ~ili < c t- h
i"hi!l'J!:E9~0 m~'ii;,: O) iIDl)c9 0
f .f . r)[":7 (;t] I) - )["-EJ ) : 55g' em 0...t
RWD r) [":7 (b:: I) -)["-EJ) :' BOg · em P)...t
5-6 T--:i~~
1. mJi1ii:~h '/ /;)1 '2:- OUTPUT:'; t, ';1 :7 '=~*'t9 6 (~5 -11
ts:~)
2. POWER A'" ';1 T'2:-¥P l-C :;t / '=96
0
3. .f- t" 7' A;)1 / • t - ;)1 '2:-@J$j;~ i:t '/ ,t - ~ / :7'7 ' ;1 '19 ~
t:.. 66 1= TEAC MTT - III T A I-- • T - '1'2:-li<-C Iv l-C, Y
< C b-7tFEIl-'t 0) ~ ~ 1= l-C to <0
4. TAI--'T-'1'2:-~~~i:t, T-'1O);IJ;!tIJ~c.rtlJ~-C
'f ii 2 0) @:;I)q~ Gh ~ ;I) ' ~1fill9 00
{ijj~: 3,OOOHz± 30 Hz PITCH CONT A '" ';1 T OFF
t" ;1 T . :::1 / r 0 -) [,. Q}~~lID CP lT CH CON T A'" ';I T
ON) :
PITCH
CON T :;t 7 MjO)iill!Jt'=j:'i l-C
± 12% 0J:.
5. b lilEfi: ;I) <flj[ffi;l) ' Gnh -Cl, \ 6 JJil ~I;t , i;,:O) iilllJ fJ W l \ ~ 9 ~o
a. T-'1~ft~'2:-~~l-C, ~'/T,o-5ff .~ ,T'"
:7 7 'J '1' r )[":7 '2:- T J. ;I :7 960
h. -'to)t5~;I)<iI*,-C;})hI:C ~' ;lT' :::1 '/ l--o-)[,.~:;t7
i =~i:t , 77.. I-- • 7-'10)7-'1~~0)r:j:liJc:~jff ~ 9
60
C, mJitl~h '/ /;)1 ;I)<3,OOOHz± 5Hz~ jf;9 J:. -) 1= t' ' ;I T • ::J
'/ r 0 - ) [,. • A'" ' ;1 T O) ~ffilli :. J) 6 A t' -F -'¥~:lEIJlm
R502 (12{)3-1~ml.) H~Jl-C~~960 ~f!f':.(iWW]]
*;1)' G5Ci:I:'~~~ h -C l, \ 6IJ\~<'" -j- A . r 5.., I '~
,Elj l,\o'::'c o
frequency counter
I ~oJ
DECK
under test
wow/flutter m eter
ETI
OUTPUT
0 0

I l :"::":MKH
5-7 WOW AND FLUTIER
5-7 'J9' 77':;9
~. : ~-~ ~ ~~~.~M.~ ft~ ~~h~h~~ L £~o
Note: These measurements should be made at the beginning, middle
and the end of the tape.
1. Connect a wow and flutter meter to the deck as shown in Fig.
5-11.
2. Load and playa TEAC MD - ll1 test tape or equivalent.
3.
Measure the wow and flutter value .
Specifications:
±fl . 08% peak (0I Nil ECI ANSI weighted)
0.06%
(NAB weighted)
5-8 CASSETIE HOLDER
1. Adjust the holder guide plate's mounting position so that when
the cassette holder in which the cassette tape is inserted is
closed, the parallel condition shown in Fig . 5-12 is obtained.
Viewed from right side
:tJ GlI J iID iEl
-0 0
2. TEA C M TT-111 ~ 7 ~·~-~;!:t:!itEl~.iH·~-CA.., L
-Cif}~~ -0.
3. '7 '.7 • 7 -7 ./ 7 ~ ~i1lIJ:tE~-O.
1: ]1111: O.06 % WRM S (IVM & llfiiD
5-8 jJ~.:; I'- • ;f\Jv9 "
1. tJ t '/ ~ tJ\ ~ ? J.... 2: h t ::. tJ t '/ ~ - ;t) v7' ~ rNl L -C . ~
5 - 12 !::~"t S¥ ntk ~7J<1.lfi. Gh -0 J:. ? t::;t)v)f. jj l' 1," 1.& 0)
ffi(fitL 1iR ~M\I~"t Q o
cassette holder
1Jt ·y ~* ' I- $" -
holder gu ide pIate
* ' I-$>" 1H r~
holder guide plate adjusting screw
*, I- $" • :tf -i rt&IJl1!!;j< :J
Adjust unit parallel can be got.
'¥ 1 jl: >;': QJ:. -5 !JlJM
Fig. 5-12
- 17-

l;':~MKn
5-9 DAMPE R ADJUSTMENT 5-9 $"//\'mJR
1. Load a C-60 tape and close the cassette holder (with the door 1.
/7 './'J ·j-- 7 ( MTT-5511) ~~-CA,L"C h t' j r·
cover attac hed).
*)(.,:$" (f7 {q-) HI! L.Qo
2. Turn the air adjusting screw so that when pushing the EJECT
2. EJE CH D~W Lt:::II;'f, h t 'j r .* )(.,;Y"tJ
i O.5
fY-1.5f YO)
button, the cassette holder opens smoothly and completely,
~rJl-ctJ66 GtJ,t:.tJ'-::Ji Gi:t:.fffi < d: j i:., .:r:. 7imlJi!;f.)~
taking 0.5 to 1.5 seconds.
@]L-C~!l-t.Q o
air adjusting
screw
8mm
Damper
IIllfrl!,!ill
Fig. 5-13
5-10 V OLTAGE C ON VE RS I ON
(FOR GENERAL EXPORTMODELS)
ALWAYS DISCONNECT THE POWER LINE CORD BEFORE
MAKING THESE CHANGES.
1. Locate the voltage selector on the rear panel.
2. Using a regular (slot blade) screwdriver, turn the selector until
the numerals corresponding the voltage requirements of your
area appear.
3. We suggest you label the rear panel with the set AC line voltage.
Note : Select 50 Hz or 60 Hz by S501 on Control PCB Ass ' y.
Fig. 5-14
[;1:] 50Hz/60H zO) tTJ~I;I.::J './ r D-)("PC B ASS·y..to)A
l' 'j f- S501 -CfTtJ~\i-to
- 18-