[TechAssist] Re: Hitachi 27AX2b M1LXU stubbron regulation-shutdown problem
- From: "Ron Miller d.b.a. Country TV" <rlmbkm@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 21 Feb 2004 19:21:40 -0600
Does this one use a SE-130 or SE-135 in the regulation loop,if so change
it.hth
Country TV
Ron Miller
Inez, TX. 77968
----- Original Message -----
From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, February 21, 2004 4:23 PM
Subject: [TechAssist] Hitachi 27AX2b M1LXU stubbron regulation-shutdown
problem
> Hitachi
> 27AX2B
> M1LXU2B
>
> 1992 chassis 1993 set
>
> Set came in dead although at plugin you would hear a slight sound
> like a start attempt, Found D902 shorted and F903 open, these feed IC902
> STRS6602, so ordered and replaced, then nothing found a main fuse that was
> blown to a vapor layer of metal on the inside of the glass sleve, replace
> then attempts to start but goes into high voltage shutdown, set would run
on
> variac if started about 80V (small pict) ramp upto 100-110v for full
> picture, so ordered IC901 STR30130, put in same diffrence, Voltage on the
> input at AC line is ~ 186v (which seems high, although Hitachi didn't list
> voltages on there schematic) Output from IC 901 is 155V if the set comes
on
> and 180+V if it does not, Have checked all parts near the regulator and
> tried changing R902 and D915 (If D915 get placed backwards set experinces
> low voltage condition # on part is SZ22 # in Schematic is AS01Z, Tried a
> NTE125 and a PR1005 (slightly better volatge than NTE552), Adusiting R902
> from stock 12k to 1/2 bring volatage to 156v out resistors higher tahn
about
> 80k give undervolatge, but when volatge is 133 or higher if set is turned
> off will be in HV shutdown at turn on, pulling plug is 50/50)
> C910 shows browning from heat damage
>
> Parts sorceing
> STRS6602 HB electronics
> STR30130 electrosound (Has Dot so would be 'A' variant)
>
> Past history
> Have replaced HOT about 18 mo ago
> installed C929 for shutdown about 6 mo ago
>
> Peter Oliver
> Tucson Radio TV
>
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