Teac CT-M805SR User 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”
Date: 01-Jan-1999
File: CTM-805SR-4
MODEL: CTM805SR
Symptom: NO SOUND
Instructions:
Replace diode D301 (it may measure ok).
*common signal diode.
Regards,
Fabian Lubanovic
Technical Manager

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
Page 1of 1
MODEL: CT-M805SR
PROBLEM: Television will go standby intermittently.
Instructions:
Move diode D904 to location D904A.
Regards,
Fabian Lubanovic
TEAC Australia Pty Ltd.

TECHNICAL BULLETIN 16th Sep 1999
Page 1of 1
MODEL: CT-M805SR
PROBLEM: UHF tuner drifting –channel loss.
REVSION 2
Instructions:
Fit a 0.1uF ceramic capacitor across R103 10k resistor (in parallel).
Refer diagram below.
If the above modification fails to operate, the next step is to replace the tuner.
Regards,
Fabian Lubanovic
TEAC Australia Pty Ltd.
Q101
Pm2369
R102
R101
R155
R103
C102
Fit cap across here

TECHNICAL BULLETIN 2-11-99
Page 1of 1
MODEL: CT-M805S/SV
PROBLEM:
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.

TECHNICAL BULLETIN 7th May 1999
Page 1of 1
MODEL: CT-M805SR
PROBLEM: 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.