Obsolete Harris IC - Need help

[elcid89]

I have two Harris ICs in my power amplifier, and need to replace them. Unfortunately, I can not find a datasheet or any information for them. It's as if they fell off the face of the earth.

It looks to be a TO-220 package, three leads, plastic body with metal tab.

Labeling has the Harris logo (white background forming a black capital letter H), and:

3101FAAA
H3 16

(logo) XS

Any help with either a datasheet or a workable substitute for this piece would be greatly appreciated!

 

[elcid89]

Note: I have checked Google and findchips with full part number, partial variations of part number, etc. and I get nothing beyond the usual chinese "put in your RFQ" sites, which are useless. I checked Harris, Intersil and TI's websites, and all of them don't know the part number (or partials).

I'm really at a brick wall with this one.

 

[Resqueline]

Failing to identify the numbers, which might be proprietary, the only other option is to identify its function from the amplifier itself.
Have you tried getting hold of a diagram for that amp? If it's not available, and if it's not too complex, we might be able to make a guess from pictures.

 

[elcid89]

They're driver transistors in the output section of the amp. They feed a pair of TIP35C/TIP36C output transistors.

The schematic seems to be closely held. My local Ford dealer professes not to have it, and JBL (who designed the amp) thus far has not responded to inquiries. I'm trying to draw it out on my own, but that's a slow process.

 

[elcid89]

This is the IC in question.

 

[elcid89]

While we're on the subject, I have been unable to identify the following 4 ICs as well. Any help is appreciated.

 

[elcid89]

Logo contains AF

M9314
70014BB

 

[elcid89]

Obviously from ST Microelectronics, but their webpage offers no guidance on this.

74008PC
C992A309
Malaysia

 

[elcid89]

Appears to be from Allegro Microsystems, but again their webpage offers no guidance.

There are two different types of this IC, both from Allegro. The packaging shown in the photo is typical of both.

1103
CA312
(logo) EBC

- AND -

1101
CB310
(logo) EBC

 

[elcid89]

Labeled with Texas Instruments logo.

25258DTBB
70001SB

 

[Resqueline]

Most definitely proprietary numbers. So it's a JBL amp designed for, & integrated into a Ford.. Does it say how much power it has, or any data at all?
You call the three-pin devices IC's (except for in one post) but it seems to me they're transistors. The EBC printed on the small ones most likely indicates their pinouts.
How about overview pictures, one top & one under? Indicate where power & ground, signal input & speaker outputs are connected (unless it's obvious).

 

[elcid89]

There is no data at all.

Something that is confusing me - the 1101 / CB310 3 pin IC / Transistor

I am tracing the current flow in order to build out my schematic (as well as I can without knowing what these pieces actually are), and I found power being applied to different pins of the same devices.

For example, Q10 and Q22. Identical devices with the part number above. One has current flowing to the rightmost pin and the other has it flowing to the leftmost pin.

That would seem to argue against it being a BJT, as one of the two would never allow any current to flow. I have to assume that it's a FET, but here's where my lack of knowledge comes into play. Assuming that the middle pin is the gate, can current flow in either direction with a FET? (i.e. from source to drain and from drain to source?)

Not being able to find the datasheets on these things is a true pain.

 

[elcid89]

This is a top view

 

[elcid89]

This is the bottom view. Sorry for the poor quality. It's about the best my iPhone can do.

 

[elcid89]

The numbers on the board, in the unlikely event that they might be useful, are:

top - SWPA026731 SUBW

bottom - F2SF-18B881-LA

 

[elcid89]

Note that the actual failure in the amp is a blown capacitor (inboard large cap, bottom left corner) and a burned resistor just above it. I'm still trying to trace the paths out manually, but they both appear to be part of the power supply. The resistor is fed off of the secondary windings of the transformer, and in turn feeds the leftmost pin of an 1101 / CB310 3 pin IC like the one in the photo

 

[Resqueline]

Devices marked as Q's are always transistors, not IC's. The only question is if they are BJT's or FET's. The TO-220 pinout is always B-C-E or G-S-D, looking at the labeling.
The transformer based power supply is a very simple IC-controlled switchmode thing. It can be traced out. The capacitor is simply worn out, it needs to be bigger & better.
Is it the power supply that's not working? It should be an easy fix, but better picture quality would certainly be useful to be able to read (& then refer to) the reference labels.

 

[shrtrnd]

Might help if you told us the mfgr of your power amplifier.
If we know the mfgr, someone might know the proprietary numbering system.

 

[Resqueline]

@ shrtrnd: he did..

 

[shrtrnd]

I see it.
Gotta be proprietary part numbers for Ford.
Best bet might be to try to find that amp in a car junk yard, and salvage a working unit,
or use for parts.
I don't know anybody that has cross ref for audio elec parts for Ford cars.
A lot of the car salvage yards in my area have computerized their parts inventory.
I used to have to search the yard, but lately, I can call around, and get what I need.
Just an idea.
(JBL won't give info on part numbers owned by Ford).
good luck