Quasar Mod # SP2727T, Ch ALEDC246

C

Charlie East

Guest
Unit came in with the fuse wraped in foil, (dont you just love those).
Checked the fuse and it was not blown.
Found the vert IC shorted, replaced it and have no vert sweep at all. Have
correct voltage to the chip., Replace all the elect. caps. still only have a
flat line.Yoke Ohm check ok.Resistors around the chip check ok., What am I
missing?, any tips appreciated
Charlie
ceast@bellsouth.net
 
You got enough letters in the chassis number to lead me to believe it is new
enough to not have a vertical output transformer, nor one of those funky 3
transistor output ckts. However it might just have a Vhold control. Many
unexplained losses of self oscillating Vsweep ckts have been explained by an
open to the Vhold control. Also many a time, bad caps will, instead of severely
distoring the raster, just simply stop oscillating.

I might be off base here, simply brcause I don't know Quasar/Panasonic chassis
numbers, if you give me an idea of the age, and if you could determine the
chipset I could tell you more. However some suprisingly newer units still use a
regular vertical oscillator, although not in the last 7 years. Remember a set
can be built in 1983 and be fully 125ch. cable ready, have onscreen controls
etc. I'm pretty sure the 1983 Quasars were either 99 or 54 channel cable. The
number on the jungle IC is a big clue to the age, and thus is a very good piece
of info to have.

Let me know.

JURB
 
(IC451-Vert IC= LA7836 ) , ( IC101- Jungle AN5163K,)
(IC001 micro MN1873234hyl, ) ( IC002 eeprom 24c02bip,)
Set does not have a vert hold, does have a size, It checks ok
Thanks guys
Charlie


"JURB6006" <jurb6006@aol.com> wrote in message
news:20030913231008.05806.00001227@mb-m07.aol.com...
You got enough letters in the chassis number to lead me to believe it is
new
enough to not have a vertical output transformer, nor one of those funky 3
transistor output ckts. However it might just have a Vhold control. Many
unexplained losses of self oscillating Vsweep ckts have been explained by
an
open to the Vhold control. Also many a time, bad caps will, instead of
severely
distoring the raster, just simply stop oscillating.

I might be off base here, simply brcause I don't know Quasar/Panasonic
chassis
numbers, if you give me an idea of the age, and if you could determine the
chipset I could tell you more. However some suprisingly newer units still
use a
regular vertical oscillator, although not in the last 7 years. Remember a
set
can be built in 1983 and be fully 125ch. cable ready, have onscreen
controls
etc. I'm pretty sure the 1983 Quasars were either 99 or 54 channel cable.
The
number on the jungle IC is a big clue to the age, and thus is a very good
piece
of info to have.

Let me know.

JURB
Click to expand...
 
Problem was the jungle IC
"Charlie East" <ceast@bellsouth.net> wrote in message
news:%CM8b.6625$vi3.2064@bignews4.bellsouth.net...
Unit came in with the fuse wraped in foil, (dont you just love those).
Checked the fuse and it was not blown.
Found the vert IC shorted, replaced it and have no vert sweep at all. Have
correct voltage to the chip., Replace all the elect. caps. still only have
a
flat line.Yoke Ohm check ok.Resistors around the chip check ok., What am I
missing?, any tips appreciated
Charlie
ceast@bellsouth.net
Click to expand...
 
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