Teleton CD-100 Service Manual

1
TELETON Electro GmbH.+Co. KG
4000 Dusseldorf-Rath Oberhausener Str. 17
Telefon (0211) 65 3081 TX858 6768
, a .
Gq Teleton
SERVICE MANUAL
CD-100 STEREO CASSETTE DECK
with DOLBY
TELETON Electro (UK) Co., Ltd.
Teleton House, Waterhouse Lane,
Chelmsford / Essex
Tel. Chelmsford 62 442 TX 99338
Technical Service Organization
Waterhouse Lane, Chelmsford Essex
Tel.(0245) 54621 1X 99338
TELETON N. V,
2200 Borgerhout Belgium
Prins- Leopold- Straat 28
Tel. 03/361045 037357670 TX 32508
TELETON NEDERLAND 8B. V.
Marconiweg 10 Vianen
Tel. 03473 3744
TELETON Electro (France) S.a.r. I.
21 rue Paul Lafargue 94 Kremlin-Bicetre
Tel. 726 4091
TRANSACO AG
Kanzleistrasse 126 8004 Zurich
Tel. 39 45 60/23 50 40 1X52 362
DISASSEMBLY (See exploded view)
Before voltage setting or repairing the tape recorder, disassemble the unit as follows;
ALIGNMENT
2-1 ALIGNMENT PROCEDURES OF MPX FILTER
(1) Removal of Dolby N.R. Amp. PCB
Take off the holder-volume & meter (No.129)
by removing 4 pcs of C)screw being fixed to the bottom
cabinet as shown in the exploded view. Then remove 4 pcs of (0) screws fixing the Dolby N.R. Amp.
PCB as shown in the exploded view.
(5) The output signal is to be measured by VTVM across PIN 3 L CH out (PIN 5 R CH out) and PIN 2 (ground)
of the DIN jack:
(7) Change generator frequency to 19 kHz without changing the level or any control.
(8) Adjust By (Low pass filter) until the output is decreased by more than -30 dB.
(9) Change generator frequency to 38 kHz.
(10) Adjust A\ (Low pass filter) until the output is decreased by more than -25 dB.
(11) Check that the attenuation effect does not exceed 2 dB at 15 kHz.
TYPICAL AVERAGE VALUES 19 kHz -35 dB
38 kHz -30 dB
NOTE: Adjustment shall start with B\ Low pass filter) otherwise this adjustment may become difficult.
'* Reference level.'
2-3 ALIGNMENT PROCEDURES OF PLAYBACK AND RECORDING AMPLIFIER
Remove 3 pcs of ©) screws, 1 pc of) screw and 3 pcs of @screws fixing the cassette mechanism as shown
in the exploded view. Then after dismounting the mechchassis from the bottom cabinet remove 2 pcs of (H)screws
fixing the switching amp PCB as shown in the exploded view.
(1) PLAYBACK
(a) Insert the Dolby level calibration tape (200 mWb/m).
(b) 'Connect VTVM across PIN 3 L CH out (PIN 5 R CH out) and PIN 2 (ground).
(c) Depress the play-button.
(b) Connect DIN jack PIN 1 (L CH IN) PIN 4 (R CH IN) and PIN 2 (ground) to an audio generator.
(d) Connect DIN jack PIN 3(LCH OUT),5(R CH OUT) and PIN 2 (ground) to V.T.V.M.
(e) Adjust AQVR 101, 201 to 580 mV output.
Note: Input signal level for both L/R CH should be the same.
2-4 ADJUSTMENT OF RECORDING CURRENT AND BIAS CURRENT
(A) NORMAL TAPE
Recording Current
1 Prepare 100 Ohm resistor.
2 Connect the 100 Ohm resistor between the upper terminal of R/P head (R CH), (Lower terminal for
L CH) and the red wire which is being connected to the respective terminal, by disconnecting from
the terminal as shown in Fig 1.
Connect VTVM across the 100 Ohm. (Fig. 1)
Disconnect the yellow wire MP/ from recording amplifier PCB.
Set the tape selector switch to the NORMAL position.
Keep the unit in recording condition.
Adjust AXVR 105 L CH (VR 205 R CH) so that the VTVM indicates 5.2mV (52uA). See "List 1"
ias Current
Connect 100 Ohm resistor same as in the above procedure (A) 2.
Restore the yellow lead wire MPA Ko the original position.
Be sure that the tape selector switch is in NORMAL position.
Keep the unit in recording condition.
Adjust AX VR 107 L CH(VR207 R CH)so that the VTVM indicates 30mV (300 uA). See'' List 1''.
Disconnect the 100 Ohm from the R/P head and solder the red wire as original:
onfirmation of adjustment.
Insert a normal tape into the deck.
Supply external 1 kHz signal from an audio generator to the input of the unit.
Record the signal at the standard level (O VU) and reproduce the recorded signal in order to confirm
if the playback level indicates the Standard Level (O VU).
4 If the playback level does not indicate the Standard Level than the above adjustments should be
repeated from the beginning until the level is indicated correctly. _ _
(B) SPECIAL TAPE
1 Follow the same alignment procedures as that of the NORMAL TAPE by setting the tape selector
switch to SPECIAL Position.
2 Adjust VR 106 (R CH), VR 206 (L CH) for recording current (6.7mV 67 HA) MP ABVR 108 (L
CH), VR 208 (R CH) for bias current (43mV 430 yA) as per "List 1"'.
3 Confirmation of adjustments following the same procedures as at the NORMAL TAPE by using
a SPECIAL TAPE.
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"TARGET VALUE OF EACH ADJUSTMENT
1. Recording current
SPECIAL TAPE
Normal tape 52 uA +16 uA P/R head er ae L CH
Special tape 67 pA +20 pA "ose
2. Bias Current
Normal tape 300 uA +90 vA Fig 1
Special Tape 430 pA +130 uA
"The tape to be used for this adjustment :
Normal tape BASF TP-18 C60
Special tape BASF SM C60
2-5
(1)
(2)
(3)
(4)
ADJUSTMENT OF |
Adjust the A 6\LA301
above level of 3.
CHASSIS EARTH
POWER SOURCE
PC.B lal
SWITCH
CHASSIS SOLE!
EARTH B¢
47K R704