[TechAssist] Re: Philips Stereo model FW-C380/37 Amp section dead - [problem found]
- From: "LeRoy Westlund" <llw@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 5 Nov 2002 13:48:21 -0700
Thanks Jim,
I found it hidden under the back cover.(After complete disassembly).
Fuse #1300 was open,...and IC # 7302 was dead short on pin # 12.
The IC is an AN7591. The fuse device has a number (F3,15A250) written on it.
Not sure of the value,...but, I think it is 315 ma, cause I found a similar
fix for a different model, on the "Intrepid Repair CD", that had these
numbers listed.
I think the Philips part number for the fuse is 482225251151,...but I need
to confirm this. Also, I need the Philips part number for the IC # 7302.
I'll check the Tritronics web site to see if they have the part numbers
listed.
Thanks again, Jim.
This is a good example of how the TechAssist system can work for ALL of us.
Also,....thanks for sending the requested Pdf file.
Have a nice day !
LLW
LeRoy Westlund
Westlund TV & Electronics " It's such a pretty world
93 North Main today !....
Centerfield, UT 84622-0087 Look at the Sunshine. "
Ph./Fax 435-528-3822 :-)
mailto:LLW@xxxxxxxxxx
-----Original Message-----
From: Jim Myers <jr.myers@xxxxxxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Tuesday, November 05, 2002 12:26 PM
Subject: [TechAssist] Re: Philips Stereo model FW-C380/37 Amp section dead
>
>VCC to IC's 7301 and 7302 is pin 12 and should be about 19 volts, each IC
>has a fuse device which may not look anything like a normal fuse, ref #
1300
>to pin 12 of 7302 and 1301 to pin 12 of 7301. They are labeled T3A15 on the
>schematic.
>Jim Myers
>Since 1972
>Telrad Electronic Services Co.
>Fort Wayne, IN 46815
>jr.myers@xxxxxxxxxxx
>260-432-4486 Fax and Voice
>Fax is always on
>----- Original Message -----
>From: "LeRoy Westlund" <llw@xxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Tuesday, November 05, 2002 12:23 PM
>Subject: [TechAssist] Re: Philips Stereo model FW-C380/37 Amp section dead
>
>
>
>Wolfe,
>Don't mistake me for one of the "dummies" on this list.
>I have over 30 years experience in this kind of work.
>I already tested the ones I could visually locate, without complete
>disassembly of the unit. Yes,...of course I checked across them with an ohm
>meter.
>That's why I need help !
>I need a service manual, or some guidence in what to check.
>
>Hell, man,.....what do you think this forum is far ?
>If you have too much ego to help a guy with a problem,....why don't you
>delete the post, and move on ?
>We can do without some of you so called educated idiots on this list.
>Stay with your computer expertisum,...and leave the TV, and stereo problems
>to those that have the resources to help.
>
>LLW
>
>LeRoy Westlund
>Westlund TV & Electronics " It's such a pretty world
>93 North Main today !....
>Centerfield, UT 84622-0087 Look at the Sunshine. "
>Ph./Fax 435-528-3822 :-)
>mailto:LLW@xxxxxxxxxx
>
>-----Original Message-----
>From: wolfe-mcse@xxxxxxx <wolfe-mcse@xxxxxxx>
>To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
>Date: Tuesday, November 05, 2002 4:29 AM
>Subject: [TechAssist] Re: Philips Stereo model FW-C380/37 Amp section dead
>
>
>>
>>Howdy...
>>
>>
>>Now you are doing something that my electronics instructor would jump on
>ANY
>>student about...that 3 word word. ASS-U-ME. Check the fuses for an open,
>>as they can develop a microfracture that is not apparent to the human eye.
>>I have seen it before.
>>
>>
>>Wolfe
>>
>>-----Original Message-----
>>From: techassist-bounce@xxxxxxxxxxxxx
>>[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of LeRoy Westlund
>>Sent: Tuesday, November 05, 2002 12:25 AM
>>To: TechAssist
>>Subject: [TechAssist] Philips Stereo model FW-C380/37 Amp section dead
>>
>>
>>
>>Hi members,
>>All functions seem to work OK,..but, unit is dead.
>>The Amp output section seems to be missing a voltage.
>>Might just be a fuse device,...but, all visable fuses are OK.
>>I have the + 41 volts, the + 28 volts, and the + 20 volts from my power
>>supply.
>>I also have the + 5 volts, and the +12 volt sources, on the Amp board.
>>The highest voltage on the Amp output ICs (7301 & 7302) is only about + 5
>>volts.
>>Seems like there should be some higher voltages on these chips.
>>I don't think that the outputs themself are blown. There are seperate
>>outputs for the left, and right channels.
>>Can someone give me the voltage readings on one of the outputs ? or,...can
>>someone provide a Pdf schematic of the output stages ?
>>
>>Any help is appreciated,
>>LLW
>>
>>LeRoy Westlund
>>Westlund TV & Electronics " It's such a pretty world
>>93 North Main today !....
>>Centerfield, UT 84622-0087 Look at the Sunshine. "
>>Ph./Fax 435-528-3822 :-)
>>mailto:LLW@xxxxxxxxxx
>>
>>
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