TEAC CTM-805-SR Service manual

TEAC AUSTRALIA

TECH MEMO – “TELEVISION”

Date: 29th-Jan-1999
File: CTM-805SR-5

CTM805SR

Symptom: FAILURE OF D402 - causing failures D403, R427 and Q402

Countermeasures:

Replace diode D402 with Philips type BY228.

Temporary Countermeasure:

Insert an additional diode in series (3TH41 Toshiba) in location D402 as per
diagram below. (both diodes 3TH41 type)

Regards,

Fabian Lubanovic

TEAC AUSTRALIA

TECH MEMO – “TELEVISION”

MODEL: CTM805SR

Symptom: NO SOUND
Instructions:

Replace diode D301 (it may measure ok).
*common signal diode.

Regards,

Fabian Lubanovic

Technical Manager

Date: 01-Jan-1999
File: CTM-805SR-4

TEAC AUSTRALIA

TECH MEMO – “TELEVISION”

Date: 29-Sep-1998
File: CTM-805SR-3

MODEL: CTM805SR

Symptom: Component SE140N (Q905) is being replaced by standard NPN

transistor.
This component is NOT a NPN transistor as shown in the CT-M805SR

circuit diagram. This device is acting as a voltage sensing device (ie.
For B+ voltage) which via the opto-coupler changes the pulse width on
the primary side of the switch-mode supply.

Equivalent Circuit:

Instructions:

Use only the specified component. Use P/N 1300SE140N when ordering.

Regards,

Fabian Lubanovic

Technical Manager

TECHNICAL BULLETIN 17th May 1999

MODEL:
PROBLEM:

CT-M805SR
Television will go standby intermittently.

Instructions:
Move diode D904 to location D904A.

Regards,

Fabian Lubanovic

TEAC Australia Pty Ltd.

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TECHNICAL BULLETIN 16th Sep 1999

Pm2369

Q101

MODEL:
PROBLEM:

CT-M805SR
UHF tuner drifting – channel loss.

REVSION 2
Instructions:
Fit a 0.1uF ceramic capacitor across R103 10k resistor (in parallel).
Refer diagram below.

R102

Fit cap across here

R101

R103

R155

C102

If the above modification fails to operate, the next step is to replace the tuner.

Regards,

Fabian Lubanovic

TEAC Australia Pty Ltd.

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TECHNICAL BULLETIN 2-11-99

MODEL:
PROBLEM:

CT-M805S/SV

Buzzing noise in standby

File: CTm805-noise.DOC

Immediately after switching to standby a buzzing noise may be heard for some time. Using the following
circuit can eliminate problem.

Instructions:

1- Remove the link between collector and emitter of Q301
2- Insert the following components in the indicated locations of the main PCB.

R305 1K
R306 10K
Q301 2SD1406

Regards,

Alcides Berta

TEAC Australia Pty Ltd.

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TECHNICAL BULLETIN 7th May 1999

MODEL:
PROBLEM:

CT-M805SR
No colour when trying to play video tapes.

This problem occurs when playing video cassette movies and is particularly noticeable when using the
MV6080G VCR.

Instructions:
Locate C249A which is close to XTAL X201 (4.43Mhz colour burst)
Replace C249A with a 15pF ceramic capacitor.

Fabian Lubanovic

TEAC Australia Pty Ltd.

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