Need Help Identifying IC

[Davide Gassee]

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

 

[Franc Zabkar]

On Wed, 15 Oct 2003 23:32:35 -0400, "Davide Gassee"
<chaletNOO_SPAMM@videotron.ca> put finger to keyboard and composed:

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
--
Please remove one 's' from my address when replying by email.

 

[Jim English]

Franc Zabkar <fzabkar@optussnet.com.au> wrote in message news:<7obsovkt7m8rlccjkjut45nv8ni8pkessq@4ax.com>...

On Wed, 15 Oct 2003 23:32:35 -0400, "Davide Gassee"
chaletNOO_SPAMM@videotron.ca> put finger to keyboard and composed:

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

That 221-302 is a Zenith part number.

 

[Jim English]

Franc Zabkar <fzabkar@optussnet.com.au> wrote in message news:<7obsovkt7m8rlccjkjut45nv8ni8pkessq@4ax.com>...

On Wed, 15 Oct 2003 23:32:35 -0400, "Davide Gassee"
chaletNOO_SPAMM@videotron.ca> put finger to keyboard and composed:

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

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