Michael:
Looking at the KX-TD200 service manual:
The diagram shows Q1 as a power FET.
The circuit description describes the transistor as a MOSFET.
The parts list does not list Q1, but does list Q301 as part PQVTDTC143E
Maybe you can purchase a replacement transistor from:
Panasonic services company
Kent WA
800-833-9626
That is where I purchased the KX-TD200 service manual for $22.46 in 1999.
Paul H. Gusciora
San Rafael, CA
-----Original Message-----
From: "Michael Karaman" <[EMAIL PROTECTED]>
To: "'Paul H. Gusciora'" <[EMAIL PROTECTED]>
Subject: RE: KX-T: Power Supply for TVS 200
Date: Wed, 22 Jan 2003 09:59:04 -0500
Organization: The Phone Network, Inc.
X-Priority: 3 (Normal)
Importance: Normal
The rectifier that I referred to is actually a power transistor, Q1, right
next to the large capacitor. The transistor is screwed to the metal shield
around the cap to be used as a heat sink. This thing go so hot that the
solder melted on the board. There may be some other problems too, but I
have to start somewhere.
I wish I had a service manual, but really don't do that much board repair.
Any help would be appreciated.
Thanks,
Michael Karaman
President
The Phone Network, Inc.
894-B Elm Street
Fayetteville, NC 28303
910-222-1234 Fax 484-1234
http://www.thephonetwork.com/
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf
Of Paul H. Gusciora
Sent: Tuesday, January 21, 2003 11:33 PM
To: KX-T Help
Subject: Re: KX-T: Power Supply for TVS 200
Michael
Looking at the service manual for the KX-TVS200 / KX-TVS204
The full-wave bridge rectifier for line power formed by diodes
D21-D28 are likely to be the components that fail first. Two diodes
in series (21-22, 23-24, 25-26, 27-28) form each leg of the bridge.
Usually, if one is trying to achieve a higher PRV, one must bypass
the diodes with capacitors and resistors to equalize voltage drop.
Since the circuit only has to handle 120 VAC (or 240 VAC) which is
easily handled by a single diode, it is likely that the diodes are in
series here to prevent failure in case (when) one of the diodes fails
in shorted mode (milliseconds prior to opening because of excess
current).
Recommendation:
1. Check all diodes D21-D28 in the bridge for short circuit conditions.
2. Look at one of the good diodes in the D21-D28 series for
hints about replacements. It is likely that they are 1N200x
equivalents (1 A forward current, x indicates PRV: 1==50V, etc. )
BTW: I had similar problems identifying relays and Zener diodes in
the KX-A46 battery backup system so that I could understand the
charge /dishcarge characteristics. I had to open the box to find
identifying markings on the relays. I also had to connect external
power to elucidate the voltage of a Zener diode.
Good luck,
Paul H. Gusciora
San Rafael, CA
From: "Michael Karaman" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Organization: The Phone Network, Inc.
Subject: KX-T: Power Supply for TVS 200
Date: Tue, 21 Jan 2003 16:56:26 -0500
Does anyone have an out of service TVS200 with a good power supply???? I
have a unit with a blown power rectifier and Pana parts cannot identify it.
Emailed a picture and everything, only a new one avail. I know it's only a
couple dollar part but I need a number. Haven't sent it to ATL for repair,
that's my next option.
Michael Karaman
President
The Phone Network, Inc.
multipart/alternative
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- Re: KX-T: Power Supply for TVS 200 Paul H. Gusciora
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