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Need Help Identifying IC

D

Davide Gassee

Jan 1, 1970
0
Hello there,

I am repairing a Zenith TV for my grandfather. It is chassis H2075Y2. The
image is fine but there is no sound.

Anyways I have been unsucessuful in locating schematics for this model. I
have found most of the schematics for the chips relating to the audio but
there is one I cannot find. It is an 18 Pin dip with the letters "AB"
written on it with a bar on each side. I have no idea what brand this is. I
did some research and came up with nothing. The chip number is "221-302" it
also says "014 B9012" below.

Can anyone tell me at least what manufacturer they think this chip is from ?
Perhaps also where I could locate schematics ?

Thanks for all your help,

DavideG
Montreal, Qc
 
F

Franc Zabkar

Jan 1, 1970
0
Hello there,

I am repairing a Zenith TV for my grandfather. It is chassis H2075Y2. The
image is fine but there is no sound.

Anyways I have been unsucessuful in locating schematics for this model. I
have found most of the schematics for the chips relating to the audio but
there is one I cannot find. It is an 18 Pin dip with the letters "AB"
written on it with a bar on each side. I have no idea what brand this is. I
did some research and came up with nothing. The chip number is "221-302" it
also says "014 B9012" below.

Probably manufactured during week 12 of 1990.
Can anyone tell me at least what manufacturer they think this chip is from ?

Could it be a resistor pack or RC pack from Allen Bradley? Can you
measure 220 ohms between each of 8 pairs of pins? Are these pins
connected to the uP's data bus?
Perhaps also where I could locate schematics ?

Thanks for all your help,

DavideG
Montreal, Qc


- Franc Zabkar
 
J

Jim English

Jan 1, 1970
0
Franc Zabkar said:
Probably manufactured during week 12 of 1990.


Could it be a resistor pack or RC pack from Allen Bradley? Can you
measure 220 ohms between each of 8 pairs of pins? Are these pins
connected to the uP's data bus?



- Franc Zabkar

That 221-302 is a Zenith part number.
 
J

Jim English

Jan 1, 1970
0
Franc Zabkar said:
Probably manufactured during week 12 of 1990.


Could it be a resistor pack or RC pack from Allen Bradley? Can you
measure 220 ohms between each of 8 pairs of pins? Are these pins
connected to the uP's data bus?



- Franc Zabkar

I looked up 221-302 on www.partsolver.com and it's a Zenith i.c. which
runs about $14.00.
 
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