DodgeIntrepid.Net Forums banner

41 - 60 of 114 Posts

·
1st Gen FTW - It's AutoMedic!
Joined
·
15,449 Posts
Discussion Starter #48
Gotcha - Having never played with your deck, I don't know what to tell you for sure.

If you follow the traces I describe, you may find where they go - and then you can follow traces back from the same area back up to the radio - if you tap in at the radio connections, then you can break the connection there and ad in your own signal. If you use the right connector, it should be a make/break signal injector where when you remove the plug, it re-connects the 'other' supply.
 

·
1st Gen FTW - It's AutoMedic!
Joined
·
15,449 Posts
Discussion Starter #51
Is your back board the same as mine? I'm wondering if the main connectors don't have the same pin-outs. You could follow the traces to see what traces go over to the amplifier.
 

·
1st Gen FTW - It's AutoMedic!
Joined
·
15,449 Posts
Discussion Starter #54
This is a detail shot of the DD control board… the black chip just off screen is the pre-amp. This processes the magnetic pulses from the tape into audio signal. This is fed to the DD control chip, a Hitachi HA12134AF. From this chip, the audio is sent out.



If you were to zoom in on the left most edge, you can read the letters MBPFGLD9R. This is not a model number, but rather this is the pin-out for the connector on the under side. The only letters I’m concerned about are the G, L, and R. Tracing the green traces on the board, the G seems to be a common line on the board, indicating possibly a GROUND path. L and R…? I wonder… So, I trace them back, and they terminate under the Hitachi chip.

I removed the Hitachi chip rather crudely, just by clipping the surface mount leads with a pair of scissors on my pocket knife (I use that knife EVERYWHERE).



Sure enough, the lines for L and R terminate under this chip. I went out and Googled the chip to find a spec sheet, and sure enough, the third pin from the right, on both sides of the chip, are the PB out. The chip is designed as a DIP (Dual Inline Package), and each side is identical and linear. Signal comes in one end, is processed, and outputs from the other end.

So, I followed these tracings to the pins, and then through the plug to the control board. Here is the front of the control board. In the upper right corner, is a small horizontal connector from the DD signal board.



Turning the board over, I follow the traces on this side. The L and R lines do not go through the control chip or any other components on this board, they go right to the ribbon cable connector on the other side of the board



I followed the traces again on the ribbon cable and up to the main board. From the main board, they do not go through any components, and go right to the main signal processor board. Here they pass through several components, and through some IC chips. This is where my trace of them ends, but signal on this board eventually passes to the amplifier.
See if you have any of the markings I describe here... Not having your unit in my lap, I don't know what you can find.

I think if you were to trace backwards from this point where the GLR wires meet the IC chips, and you go towards the radio boards, or just pull the radio boards apart and look for GLR indicators on those connectors, that's where I'd concentrate on injecting signal.
 

·
Registered
Joined
·
763 Posts
well i'm looking at the pic that i seen on another forum about this deck and this pic of this deck pinouts and the other forum found a way to pinout a 3way switch to go from cd to aux so i'm thinking opposite and tracing pins from the tape deck similar to what he did with the cd part
 

·
1st Gen FTW - It's AutoMedic!
Joined
·
15,449 Posts
Discussion Starter #60
the last three letters - RGL - follow those traces up and see if they end up at the signal processor section of the board - if so, then that is Right, Ground, Left - your three audio signals
 
41 - 60 of 114 Posts
Top