THORENS TD-150 AB series II User manual

THORENS
TD-150AB / TD-I5O AB SERIESII
SERVICEMANUAL
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IPAGE
.. LiL5
RU}{BLE
ANDNOISELEVEL:
Runble is any low frequency disEurbance in the reproduction
of phonograph record due Eo the vibration of Ehe motor or
Ehe Eurntable drive system. Rumble is most easily studied
by playing a record with unmodulated grooves and observing
the noise output. The noise level present in the records
currently available is at least equivalent and in most
cases less than the rumble level of Ehe THORENS
TD-150
model turntable.
The objective measuremenE
of the rumble level of a turntable
is not a s imple rnatter. It requires elaborate insErumentation
and exEreme care. The results may also differ with the
measurement method employed. The THORENS
TD-150 model
turntables are measured according to the DIN 45539 sEandards.
As an approximate measure a subj ective evaluation of the
runble level rrrElybe observed.
NORMAL
TZED AUD IT ION COND
IT IONS
Every subj ective evaluation of the rumble and noise level of
a turntable requires that well defined, audition conditions be
real ized ,
A record should be selecEed, for auditioning, that is widely
accepted as an excellenE orchesEra recording and not one
with an overall too low level and lacking bass. Then, playing
a Fortissimo passage, the volume control should be adjusted
to obtain complete musical pleasure, at a normal listening
level without any disturbing element. The bass conErol on
the preamplifier should be adjusted Eo obtain as natural a
sound as possible. For well designed amplifiers, Ehis
should be aEtained very near Eo the theoretical equalLzation
characEeristics (tfott
positions of Ehe
bass and treble controls).
These adjustments of volune and tone controls should not be
modified for the nrmble level evaluation which should be made,
when a special test record is not available, on the very
firsE unmodulated grooves of a good record, before the groove
where the recording amplifier has been swiEched oD, and then
on a passage with the minimumrecorded level.
FurEhermore, the evaluaEion
the room where best uusical
jusE near a loudspeaker.
should be made from the place in
results are obtained and not

PAGE
: 2/L5
If under Ehese conditions, Ehe rumble level of the turntable
is judged disturbing, Ehe following tests nay help to Erace
the cause of Ehe trouble. For analysis of Ehe
noise, firsE
lift the pick-up off the record without changing the control
setting; the remaining noise will be hum. Shut off the turn-
table , if the hum rernains it may be concluded tha t the hum is
due to an incomplete or incorrect installation of the pick-up
carEridge, the improper wiring sysEem
is employed (3 wire or
5 wire) for Ehe parEicular manufacEureof carEridge or the
amplifier is at fault.
The amplifier may
and observing the
should be checked
The wiring sys
tem
pick-up carEridge
be checked by short-circuiting the inputs
hum level. If it is unchanged the amplifier
fur ther .
(3 wire or 5 wire) as recommended by the
manufacturer should be employed.
If when the turntable moEor
cause nay be attributed to
(rumble) . LubricaEion and
followed as described.
ACOUSTICFEEDBACK
is shut off the hum ceases. The
EurnLable and
/ or motor vibrations
service procedures should be
The very low frequency sounds coming out of the loudspeakers
rnlly Eransmit appreciable vibraLions to the turntable. The
cabineE supporting this turntable, scting as a resonaEor, may
amplify Ehesevibrations. This will result in higher noise
levels, and in some
cas€s, in instability or feedback. The
acoustic isolation of the THORENS
model TD-150 turntable may
be adjusEed as described in Ehe section "Chass
is suspens
iont'
.
If the cabinet is acting as a resonaEor, it may become
necessary Eo find another place for the turnEable if compleEe
stability is to be obtained.
SERVICE
PROECDURES
RUBBER
BELT-S 8OO-574
Examine Ehe rubber belt by stretching it. If cracks appear
in the rubber, the belt is dried out and should be replaced.
Before replacing the belt, examine Ehe surface of Ehe motor
pulley and ouEer skirt of the inner turntable for traces of
rubber deposits. Clean Ehesesurfaces with a soft cloth
saturated in denatured alcohol and replace the belE.

PAGE
: 3/L5
If Ehe rubber belE makes a "slapping" noise, too rnuchmoisture
in the belE may be the cause. Dust your fingers, lightly,
with talcum powder and pass the belt through the powder to
"drytt it or absorb the moisEure.
MOTOR S 804-550 (60H2)
s 800- 5s0
(soHz)
The motor bearings are of Ehe oi1 retaining type with an oil
reserve. Under normal use, the initial lubrication, made aE
the factory, should be suf f icient for about I ,000 hours t t:Lln.
When the need for a new lubricaEion becomes appareot, proceed
as follows:
MOTORUPPER BEARING
Place a few drops of ROB
oil on toP of the bearing, where
the shaft comes
out of the top motor shield.
MOTOR
LOWER
BEARINGS
Oil should be put on Ehe lower part of the shaft where iL
exEends from Ehe mot,or hous
ing .
MOTORAZIMUTH
If Ehe rubber belr (S 800-
574) slips off the motor pulley or
rides on Ehe flange of Ehe motor pulley, causing incorrect
speeds (33 L/3 or 45 RPM)
the azimuth of the motor in
relaEion to the inner turntable plaEter may have to be
corrected. This may be accornplished by adjusEing the screw
locaEed between the moEor pulley and inner turnEable platter.
Refer to diagram number 1.
The condition of the bearing well and turntable shaft, and
their lubrication, n€lybe checked over a period of time by
periodically noting how nany revolutions may be counLed from
the momentthe Eurntable is aE full running speed (33 Ll3 rpm)
until the turntable stops. The rubber belt should be removed
for Ehis test and the turntable rotated by hand to achieve
operating speed as observed with a stroboscope. If Ehenumber
of revolutions drops radically, Ehe lubrication of both parts
is indicated.

II
I
PAGE
: 4lL5
ON-OFFSWITCH 181 E-37 (rD-
r
5OAB)
181E-10 (rD-r50
/tt)
If the on-off switch fails to operate, remove the unic from
AC and check the contacts with the ohrrneter, operating the
actuating lever by hand. The speed selector knob should be
in one of Ehe "on" (speed) positions. If the switch makes
conEinuity but the actuating lever movement is insufficient
to acEuate the switch, adjust the lever or acEuating cam.
The reverse procedure to Ehe
the unit fails to shut off.
also be tested for a short.
If a "popping" noise occurs
switch is operated, the 0.01
should be replaced.
above should be followed if
The 0.01 ufd condensor should
in the speakers when the on-off
ufd condensor nay be open and
50/60 HZ - 110/220 VOLT
OPERATTON
Refer to wiring drawing number 2, 50/60 HZ conversion requires
replacemenE
of Ehe complete motor assembly S 800-550 for 50
HZ and S 804-
550 for 60 HZ.
220 Volt operation requires
be connected in series with
the resis tor is ornmitted or
CTTAS
SIS SUSPEI{S
ION
that a 5600 ohm, 5 watt resistor
Ehemotor. For 110 volt operaEion
shorted in the circuit.
The trfloaEing chassis" supporting the turntable platEers and
tonearm board is set upon three conical springs (S 800-523).
The fir:mness of the "floating chassis" may be adjusted for
improved acoustical damping or against room vibrations and
also to compensate
for heavier Eonearms
that may be used.
The hardboard bottom cover to the wood base should be removed.
The nut securing the conical springs (S 800- 523) rnay
be
tighEened for a firmer or loosened for a softer suspension.
Care should be taken that af ter adjustment, the rrf
loating
chassis" renains free and does not impinge upon the fixed
chassis or wood base. Direct contact betrveenthe tvo will
cause motor vibrations Eo be transmitted directly to the
tonearm.

Fi7ur. 1
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5lL5
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FIGURE
4 TD-150 AB SERIES
I PAGE| 7lL5
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PAGE:
L2/L5
THORENS
PARTS
LIST
(TD-150,
TD-150AB,
TD-l50AB
lttl
t
A4 DIN L37
A 4 DIN 69L3
AM 4X5 DIN 913-1OK
B2 9X9-5 DrN 7974
B3-2 DIN 933
BM 2XL2X6 DIN 84
BZ 2-9 DIN 797L
rdt'
D
rN 934
M3X6
DIN 84
M3X8DIN 84
M3Xl0 DIN 85q
M3XT2
DIN 84
M3x15DIN 84
M3X16
DIN 84
YI4DIN 93t+
M4X5DIN 9L6
M4X8DIN 438
M5 D
IN 433
M5 D
IN 934
M 5X50DIN 84sE.
s 800-
510
s 800
-sL4
s 800-
515
s 800-
516
s 800-
5L7
s 800-
519
s 800
- 52L
s 800
-522
s 800
-523
s 800
-
526
s 800-
527
s 800
- 528
s 800-
550
s 800
- 552
s 800-561
s 800-
s67
s 800-
569
s 800-
s74
s 800-
s7
8
s 800-578D
s 800-1353*
s 800-1788
s 801
-237
s 801
-239*
s 801-
1057
s 802-500
s 808-
13*
Lock Washer
Was
he
r
Screw
Screw
Washer
Screw
Screw
NuE
Screw
Screw
Screw
Screw
Screw
Screw
Nut
Grub Screws
Grub Screws
Nut
NUE
Screw
Outer Turntable
Speed Change Drum (Series I)
Spindle for speed change drum (Series I)
Speed Change Lever (Series I)
Belt Lever (Series I)
Knob (Series I)
Spacer
45 RPM
Adaptor
Conical Spring
Suspension Chassis-CompleEe (Series I)
Inner Turntable
Chassis Place (Series I)
50 HZ Motor with Pulley
Brushed Aluminum Deck Plate (Series I)
Damper
Suspension gromne
Es-upper
Suspension groumets- lower
Rubber Belts
Tonear:m
mounting board-blank
Tonearm mounting board-drilled (Series I)
Bearing Well (Series II) S 856
-022)
Rubber Mat
Arm Rest (Series I)
Base for Tonearm (S 871-005)
Arm Lock (Series II)
Wood Base (Series I)
Wiring harness ground (S 871-005

PAGE:13/15
s 800-517 Belt Lever (Series I)
S 800-519 Knob (Series I)
S 800-521 Spacer
S 800-522 45 RPM
adaPtor
S 800-523 Conical spring
S 800-526 Suspension
chassis-Complete (Series I)
S 800-527 Inner Turntable
S 800-528 Chassis
plate (Series I)
S 800-550 50 HZnotor with PulleY
S 8OO-552 Brushedaluminum
deck plate (Series I)
S 800-56L DamPer
S 800-567 Suspension
grolmets-upper
S 800-568 Suspension
gromnets-lower
s 800-574 Rubber
belt
S 800-478 Tonearm
mounting board-bland
S 800-4780 Tonearm
mountingboard-drilled (Series I)
S 800-1353* Bearing Well- (Series II) (S 856-022)
s 800-1788 Rubber
mat
S 801-237 ArmRest (Series I)
S 801-239& Base for tonearm (s 871-005)
S 801-1057 ArmLock (Series II)
S 802-5OO WoodBase (Series I)
S 802-501 Hardboard
botton cover
s 804-550 60 HZ-neter with PulleY
S 808-13* Wiring harness ground (s 871-005)
s 808-20* Wiring harness lift ( s 871-005)
S 808-21* Wiring harness right (s 871-005)
S 808-108 Knurl-ed screw
S 808-200 Tonearm
tube (Series I)
s 808-202* Screwcollar (S 871-005)
s 808-205* Tonearm
shaft (808-200)
S 808-208* Bearing bushlng
S 808-211 Knurled screw (Series I)
S 808-215* Hol-ding
arrn (S 808-200)
s 808-218 Ball holder
S 808-220* Clarnp
(S 808-200)
S 808-221 Bearing screlt (Serles I)
s 808-222 Threaded bushing (Series I)
S 808-223 Counterweight (Series I)
S 808-224 Tube and CaP (Series I)
S 808-225 Calibration place (Series I)
S 808-225A* plug (S 871-005)
S 808-226* sleeve (S 871''005)
s 808-228 Lohteringdevice (Series I)
s 808-229* shaft (s 808-228)
S 808-230* screw plug (s 808-228)
s 808-231* PLate (S 808-228

s 808
-234*
s 808
-235*
s 808-
237
s 808- 930*
s 808
-39L2*
s 843
-2L*
s 843
-285*
s 843
-297
s 843-304
s 840-011*
s 850-017*
s 850-163
s 850
-206
s 850-2L0
s 850-211A*
s 850
-240*
s 850-277
A*
s 850
-29L
s 851
-277
A
' s 855-26*
s 855
-069
s 855-073
s 855-098
s 855-151
s 855-249
s 856-002
s 856
-027
s 856-062
s 856
-L7L
s 856-191
s 856
-2L6
s 858-284
s 859-098
-
s 871-005
s 871-006*
s 871-007*
s 871-058A*
s 871-060*
s 87L-065
s 87L-067*
s 871-069*
s 871- 072
s 871- 074*
s 87r-076
s 871-105
1.
5h 8X10DrN 7
2.3 DrN6799*
2.7XL5DrN7
5
t
PAGE:
L4/L5
Lever (S 808
-228
Bearing Block (S 808-200)
Pos
t f
or Arm Lock (Series I)
Cover Cap (S 808-200)
slotted nut (S 808
-228)
Plug (S 871-005)
cueing lever (S 856-191)
Gasket (Series II)
cueing platform (Series II)
Bracket (S 856-002)
Mounting stud (S 840
-29L)
Lever (Series II)
Belt Guide (Series II)
Belt lever (Series II)
rab (s 856-002)
Cueing Shafr (S 856-191)
50 HZMotor Pulley (S 855-098)
Chassis Plate-movable
60 Hz Moror pulley (s 859-098)
MagneEic
Shield (S 856-002)
Speedselector cam (Series II)
Rod (Series II)
50 HZ Motor with pulley
Insulation plate (Series II)
Brushed aluminum deck plate (Series II)
Chassis plate- fixed (Series II)
Rubber cushions
Cueing cam (Series II)
Tonearm
board-drilled (Series II)
Cueing mechanism (Series II)
Cable (Series II)
Wood
Base (Series II)
- 60 HZ Motor wiLh Pulley
Tonearm-complete (Series II)
Screw plate (S 87L-005)
Console (S 87L-005)
Sytlus Force Arm (S 87
-005)
Anti-skating arm movable (S 871-005)
CounterhTeight (Series II)
Sleeve for counterweight (S 87L-065)
Knob for counter*reight (S 87
-065)
SEylus force weight (Series II)
Knbo for stylus force weight (S 871-072)
Anti-skating arm-fixed (Series II)
Anti-skating weight (Serles II)
Pin
Lock washer (S 808-228)
Screw

2.9 X 10 DrN 897
4
3 DrN 67
99
3.2 DIN L25
3.2 DrN 433
3.2 DIN 433 hp
3X0.4 DIN 47L
3X7 DIN 96st
3XIO D
IN 96
4X0
.4 DIN !+7L
4.3 DIN L25
5.3 DIN L25
5.3 DrN 433
6XO.
7 DIN 47L
6
.4x0
.
5x11
8X3.
2X0.3
DrN
2093
181
E 37
183e 10
189-18
20L e 106
202 e 49*
206 E 59
296
E 60
207 E L4
207 E 52
207 E 53
208
E 45
25A
E 11
260e
82
260e83
287
-2
290e108
313
-L57
3
13-
159
3L2-
160
3L2-
185
3L2-
187
3L4-42*
3L4-44
320-lt 20
320-02L
320-28
32L-E 26x
32L-25
PAGE:
15
/tS
WoodScrew
Clip
Washer
Washer
Washer
Cl
ip
Woodscrew
Woodscrew
CX.lp
Washer
1^Iasher
Washer
Cl
ip
Washer
Washer
Terminal Strip (Series I)
Switch (Series II)
gasket (Series II) o
Ter:urinal
block (Series II)
Ground hug (S 871-005)
Terminal Strip (Series II)
Terminal strip (Series I)
Cable Clamp
Cable Clamp
Cable Clanp
Rubber grorutets
Balls (Series I)
Cueing knob (Series II)
on-off knob (Series II)
washer
escuEoheon
(Series II)
I^Iasher
Washer
Spacer
Spacer
Sleeve
Stud (S 856-002)
Shaft
Tension Spring
Spring
Spring
Pressure Spring (S 808
-228)
Spring