Teac CT-M511S Bedienungsanleitung

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Model: CTM511/5S, CTM631/5S, CTM711/5S -Stereo Televisions

Symptom: The instability of the Stereo Identification Signal on some high quality live stereo

TV programs will cause split-second Sound distortion that may be confused as

‘Sibilance’. Replacement of C015 will improve filtering of the ID signal and remove

any interference causing the effect. Stereo LED indicators may or may not switch

off when distortion is audible. However, re-transmitted programs from

overseas, movies and alike will not show any symptoms.

Instruction: Incoming RF signal must be clean, high quality live transmission to verify if a TV is

effected (use the NEWS or ABC Kids programs for example).

Check Stereo ID signal (˜117.5Hz) present on [TP001] Pin 5 of TDA 3803A (IC001).

The sinewave found should be at least 7.0 Vpp (AC) and may vary slightly in

amplitude from station to station. Instability of this wave is synchronised with speech

and music and will show as a milli-second collapse.

Carefully remove Stereo PCB, disconnection all connectors and the link to the main

PCB (going to R633). Replace C015 from the original 10nF with a 1nF Capacitor .

Reconnect all connectors and the link, check [TP001] again.

[TP001] must be peaked to its

maximum amplitude with

T001 and thereafter readjusted

to a more stable waveform

with a shoulder distortion, as

shown typically 6.5Vpp and

8.5ms , (use a suitable

adjustment tool and

do not readjust any other

potentiometers on the Stereo

PCB).

Please note that the correct adjustment of T001 must result in a distinctive ‘shoulder

distortion’ on the positive rising edge of the sinewave, the falling side is undistorted. This is

not the maximum amplitude adjustment as outlined in the service manual!

Should you require any more information, please fax your enquiry on (03) 646 5554 to the

attention of the Technical Manager.

Zoltan Sekula

Technical Manager

TEAC AUSTRALIA

TECH MEMO #TV#

05.08.94

Distortion on

rising shoulder.

Perfect symmetrical

waveform on negative

half

V.

T

Model: CTM511/5S, CTM631/5S, CTM711/5S -Stereo Televisions

Symptom: All sets have in common a 12 Volt Zener Diode ((ZD 402 -12V/1W) short and

limiting Resistor (0.68Ωand/or 6.2Ω) open, or vertical collapse (TDA 3653B)

and/or Horizontal output transistor (2SD1555 or 2SD1547) short.

Confirmation: Check B+ as 112V/(143V respectively CTM 7xx) up by ~ 30 to 40Volts

Check 12 Volt rail and if not there....

Check Zener Diode (ZD 402) for short (near Vertical heatsink)

(CTM511/515) Check R423 open

(CTM631/635, CTM 711/715) Check R435 open (near EHT TRX)

Instruction: Replace all faulty components and the following Capacitors in the Power supply.

CTM CTM CTM

Old Value New Value 511/515 631/635 711/715

47uF/25V 47uF/63V C909 C910 C910

10uF/50V 10uF/100V C910 C908 C908

Also check the B+ rail capacitor and replace it if the powersupply failed as outlined above.

Model Location Original: Replace with:

CTM511 or 515 C915 47uF/160V 47uF/160V

CTM631 or 635 C926 22uF/160V 22uF/160V

CTM711 or 715 C925 100uF/150V 100uF/160V

Special Note:

When a unit is repaired for the symptoms as described above and the Capacitors are not

replaced, because it is not apparent that they are faulty, it will result in a repeated

breakdown within days after completion of the repair.

It is imperative that all Televisions with the above model number, irrespective of the

original complaint, have the outlined power supply Capacitors replaced as a matter of

preventative service.

Should you require any more information, please fax your enquiry on (03) 646 5554 to the attention

of the Technical Manager.

TEAC AUSTRALIA

TECH MEMO

23.07.94

TECHNICAL BULLETIN 17th May 1999

Page 1of 1

MODEL: CT-M511S, 515S, 483, 484, 485

PROBLEM: FLAGWAVING WITH MACROVISION ENCODED TAPE.

Instructions:

Replace C137 with 680pF ceramic capacitor.

In some televisions you may require a 470pF ceramic capacitor.

Regards,

Fabian Lubanovic

TEAC Australia Pty Ltd.