[TechAssist] Re: Toshiba CF32C50, very low audio
- From: Randy Evans <tvsvc2000@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 21 Jun 2005 07:41:04 -0700 (PDT)
Hi Ken:
I had the same model, and the same problem a few months ago.
The customer was in a hurry so I never was able to resolve the problem.
I installed the SKUP9102......with no change in the symptom.
It makes me wonder if the SK version of the SBX1637 is any good
any more? The next time that I need one I'm going with the Sony
Original ! If I were you I'd try another chip before going any further.
Below is a post from this list for a CF30C50
Randy Evans
VCR SERVICE
Delta, Ohio 43515
CF30C50 TAC9301 Low Audio Problem
Thanks Andrew, but replacing the MPX Decoder "again" solved the low
volume problem.
Paul Worthen
C&W Electronics
117 W Main St
Azle Texas
c_w_electronics@xxxxxxxxxxx
----- Original Message -----
From: Andrew Rose<mailto:badandy2@xxxxxxxxxxxxx>
To: repair@xxxxxxxxxxxxxxx<mailto:repair@xxxxxxxxxxxxxxx>
Sent: Wednesday, January 12, 2005 8:54 AM
Subject: [TechAssist-B] Re: CF30C50; TAC9301 low audio problem -
I think I have that schematic let me know and I will look for it and
send it
out snail mail
Andrew Rose Action TV. Holbrook ny.
----- Original Message -----
From: "Paul Worthen"
<c_w_electronics@xxxxxxxxxxx<mailto:c_w_electronics@xxxxxxxxxxx>>
To: <repair@xxxxxxxxxxxxxxx<mailto:repair@xxxxxxxxxxxxxxx>>
Sent: Tuesday, January 11, 2005 10:31 PM
Subject: [TechAssist-B] CF30C50; TAC9301 low audio problem -
> No sound, found/changed corroded SBX1637 in MVUS32S module, which
brought
audio back, but low. At max volume, sound is only at normal listening
level.
> No diagram - any similar sams number for audio circuit or audio
tips would
be appreciated.
>
> Paul W
> C&W Electronics
> 117 W Main St
> Azle Texas
> 817-444-4520
>
gulftech@xxxxxxxx wrote:I am missing something here that is driving me crazy.
I originally thought it was the typical Sony sound module (SBX1637) bad.
I replaced that a little over three years ago, but put a new one in. No
change. It uses a TA8200AH audio output. I have audio in and out both
channels and at the speakers, but only the slightest sound FROM the
speakers. I subbed the speakers with no improvement. The 470 ufd
coupling caps are good. Tried a new TA8200. No change. Checked the
internal/external speakers switch. There is audio present at the audio
out jacks.
The output stage seems to be working, because the signal is greater on
the output than the input. The darn thing SHOULD work, but it doesn't!
I have 27v B+, 5V on the mute, and about 11V on each output pin. No
print, but I think that is about normal.
If you have a scan of the output stage or the voltages on IC610
(LA7800AH), it would sure help. Winstips lists QN14 and QA60 as possible
causes for no audio, but they check good and besides I do have audio
present at both inputs and outputs.
Had enough fun for today.
TIA,
Ken Smith
Gulf Technical Services
3034 Gulf Breeze Parkway
Gulf Breeze, FL 32563
850-934-8324 (Voice) 850-932-0819 (Fax)
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