Batboard

hey all, got an A7 that is stuck in "BRIGHT", the dim switch doesnt do anything, and the backlights for the keys do not come on... I am about sure that for some reason, it is jumpered on the control head to be like this (an A5 head attached works perfectly).

With that said, i am pretty sure that resetting the jumpers (Ju16 i believe) will correct this.. however, i do not know the location of the jumpers and which is which... i have searched around and dont want to screw the head up by guessing.. lol

anyone have a map of where they are and what they do? This same head also does not automatically come on when the car is started (the a5 will fire the radio right up). Could i also assume that there is a jumper setting for this as well? Im pretty sure its not in RSS, as all i have to do is change the head and it corrects it.

thanks as always guys

marc

Check to see if JU16 has been removed. If it has, and JU17 has been installed, then DIM has been defeated. To re-establish, remove JU17 and install JU16. If the keypad buttons aren't lit, then check to see if JU100 has been installed. (It shorts the 4 leds behind the keypad.) Remove JU100.

JU100 is in the upper left corner of the head PCB, when looking at the back. Next to a screw holding the black plastic fence. 1/2 in above and to the left of U1. U1 being uP near the left hand end of the board. At just about the diagonally opposite corner across the board from the microphone connector.

JU16 is just below the lower right corner of T60, which is the small transformer between U1 and U4. JU16 runs horizontally next to T60, and JU17 runs vertically, immediately below and to the right of JU16.

Lee

thanks lee...

thats what i needed.. i figured it was a jumper, but mother moto doesnt label them..

figures there would be no service manuals on ebay at the moment.. lol

did some testing

the A7 when in the trunk mount radio (on a hln6432c board) the lights work fine, and RSS is able to correctly program them... the A5 head on the same radio (in the same holder in fact) the lights come on as they are supposed to for a non-enhanced head.

in the dash mount, the A5 head's lights work fine (radio has the 6066 board, with the batlabs mod to isolate pins 4,5,22 and 29) and the A7 head works, but has no backlights and the dim doesnt function...

so much for the jumper idea.. i guess now im dealing with an interconnect board issue?

Batlab's IMAGE of the /\/\ connector numbering doesn't help with this. But, using the Batlabs convention, Pin 22 doesn't need to be cut as its VIP-out-2.

The other pins are correct. But, cutting 22 (/\/\ pin 17) on P502 shouldn't have hurt anything. If you have a 6285, try that with it to see if there's any difference.

Really has to be an interface or special jumper problem. There are so many jumper possibilities......

Sure would be nice if somebody at Batlabs would correct the pin out sequence for the 6066A/B board mod. It should be, on P502, remove or cut pins 10, 34 and 35. Pin 32 is the factory keyed (removed) pin. (Batlabs description of 4,5, and 29 are the image of the /\/\ labelling.)

Not that its important, or anything like that, but someone might 'blindly' forge ahead, assuming the correct pinout orientation from the manual and not checking first.......ouch. Wrong pins snipped and a blown audio chip to boot.

It sounds like your trunk mount and dash mount are different radios with their own code plugs.

If your A7 head is an enhanced head and the RSS set the control head type to enhanced, then the control head back light and dim is programmable. Check your F6 control head programming (F9 control head options) on your dash mount radio. The A7 control head might simply be doing what it was told to do. As you mentioned the A5 is not enhanced, it would not be affected by the control head options programming (i.e. you can program the A5 as an enhanced head, but it will not make any difference to the A5).

ive set the dash mount to both standard and enhanced.. no matter what i do, the backlights and the dim control on the A7 head do not work.. but the a5 works fine.

now the trunk mount radio, the heads work properly.

There is nothing on a normal remote mount interface that has anything to do with the back light or DIM. A pin out of the A5/A7 control head connector is here:
http://www.open.org/~blenderm/spectra/b ... tml#chp103

Are you using a DEK on the remote mount radio? If so, try programming the A7 while it is on the dash mount. I would still check the dash mount F9 control head options programming in any case.

60hzEE, you forgot to mention one of the pins. Here is a version of the fix that matches Motorola's pin numbers:
http://www.open.org/~blenderm/spectra/#spifix

BTW, the Batlabs fix, non-Motorola pin numbers and all, works just fine as long as you follow the instructions on the Batlabs page exactly.

no DEKs at all, just the head going into the holder...

i verified the pinouts on the 6066 (prior to cutting the traces, the radio would go into the transmitting hissy fit). I have set the head to enhanced and tried programming the backlights on, and nothing.. i have also set it to standard and the same thing... this head in the dashmount has no backlights at all, and the dim button doesnt do anything... remove the A7 and put it in the remote mount, and it works as its supposed to, even the RSS programable backlights. and the non-enhanced A5s backlights and dim button work properly in both radios.


on a side note:

mike do you have on your site a diagram of the jumpers? im still a bit lost on the config, i would like to jumper the A5 backlights on all the time, regardless of dim setting.

im thinking there is something wierd with this T83, as whenever i enable Zones, i get a Fail 001 on any frequency, disable zones and it works fine on all modes.

Oops. I guess I left out the HUB pin removal since it didn't cause an 'emergency' enable on any of my Spectras.

Get a 68P81109C33, the A5 and A7 Control Head manual. It has all of them in living color, including jumper locations and a jumper table.

From what you describe, it sure sounds like a jumper either on the command board or on the A7 head that's causing your problem (presence or absence).

Lee

60hzEE has the best advice on getting a manual. BTW, if you ever run into a head with the ancient HLN6020 or HLN6078 circuit boards, you will need the 6880101W33 detailed service manual (it might be in other older manuals as well?).

There are a bunch of A5 and A7 circuit boards. Most of them have many different revisions and I do not have complete documentation on every board and revision.
HLN6020
HLN6078
HLN6075
HLN6263
HLN6283
HLN6337
HLN6338

As you know, Motorola was not big on providing jumper locater diagrams in their documentation. Even with the documentation I do have, it would be a fairly substantial effort to track down all the jumpers on these boards/revisions and make jumper locater drawings for each variation. Right now, I do not have the time to undertake this project.

The control head manual also has the interconnect board documentation. With the type of unusual problem you are seeing, you can use all the reference documentation you can get.

I had a simmular problem on a A4 head on a A7 VHF dash mount.
Mike, thanks for the info on trace cuts, I had to fly blind. No roadmap for the A4 head.

Just to make shure i getting this write. VFD Display works, steady bright, no keypad led backlight?

I had a similar problem on a HLN6283B A7 , all of the leds are in series fed from the power supply wich also feeds the VFD Display, either one of the leds has a bad solder joint (fixed mine), or the transistor that drived the leds is bad, NPN type.
The jumpers select weather the Base of the transistor is pulled high with the 5v line (Comes on with IP or front button) or
driven by the 68HC05 microprocessor.

I know i've had problems with HLN6075A, these didnt have the jumpers for the above mod, the backlight is driven directly by the Micro. All though removing the transistor and jumping Collector to Emitter fixed it. comes on when ever the VFD display comes on. DIM button doesn't do any thing on the one i had.

J