vigman
Motor head!!!!
- Joined
- Feb 13, 2001
- Messages
- 3,471
- Location
- Valencia, CA,USA
- Corvette
- 88 Convert ( SOLD ) /1973 coupe 4 speed/1964 Vert!
Inside of the dash??.
There are 4 882 halogen light bulbs 84-88 which provide back lighting for the LCD displays... There are NO LED?s in the dash..... The 89 has different style bulbs.
The 882 bulbs are a halogen Bi-Pin bulb.. Do not get your greasy mits on the bulb or risk doing this again! The 882 bulbs are about 14 watts.
Most of the 84-89 dashes I have rebuilt need new sockets for the light bulbs , it's usually pretty toasted in there.
I would HIGHLY advise removing the dash and see what you have inside.
If your not technically inclined...have it done....
In 1989 they switched to the same light as in a normal Chevy dash (Like in the drivers info panel, larger, less wattage) . There is a 10 watt version of that bulb (Stanley 7073) and using this setup instead of the 882?s. The trick is going to a good auto parts store or junk yard and finding good lamp bases. The dash is a bit dimmer but will last longer, and your wallet will not be as light!
Removing bulbs from the front??.
I've found in the past 882's that have been in for a while are a bear to get out (through the front) and if the sockets are bad when you push the new bulb in. they disintergrate. If the sockets are ok the that is a good way to go, the Mid America kit comes complete with a hose & push stick & new sockets all that for $50.00 deal huh? (Plus s&h)
The few & the brave??.
You ?ve decided to venture into the DASH ZONE
This is a good link to removing the dash electronics out of the dashboard!
http://www.corvettemagazine.com/2001/January/dash/digidashpg1.asp
Assuming you have the back tin panel off already?
Inside the guts, there are 2 main boards
The top most one the input / output board.
The top board has the cruise control.
odometer drive circuit. Changes in this include the odometer wiring from a 2 pin red connector to a 3 pin black connector.
5-volt regulator for the CMOS chips. In 84-87? This was on a separate daughter board
later it was incorporated into the PC board.
To remove the top board there are 6 screws.
Remove the screws, and carefully lift the top board.
If your just replacing bulbs STOP HERE! Remove the old bulbs, clean the bulb connection points with an eraser ( like on the end of the pencil)?.Replace the bulbs.
The top board has a 12 pin molex style connection (female) and the bottom board has a 12 pin male
This connection fails due to poor spring contact, it builds up resistance over time.. which generates heat & melts the connection point.. No back lighting anymore, Boo Hoo!
In extreme cases the pins get so hot they slightly melt the solder connections on the lower
(Male) pins on the board. And you usually get the following
I beat on the dash? the lights come back on.
If your brave & bored.. Continue
The bottom board
Has the display electronics on it
Has the 882 sockets on it.
( there are a few flavors of this board which relate to the TACH functions)
The 84 style
The 85 with the X10 X100 display
(So 950 rpm shows up as 95 as opposed to 9 in the number window)
And the later models with Upshift and Upshift for best economy
The O/D display ( for 4+3?s)
And in 89 the 1 to 4 display
Now a warning here, If you are not careful past this point you could damage the glass LCD elements render the dash useless!
The bottom board has the connection points from the bottom of the Printed Circuit Board via the "Pink Pearl eraser contactors" ( pause for effect)
The current flow comes from the boards VIA the "Pinkies" and directly touches the edge of the glass LCD elements?. Over age & time the "Pinkies" stick to the glass & to the PCB?s?..
There are about 16 screws that hold this assy together.
Carefully lift this board up while holding the black plastic Pinkie holders down.
If you lift the glass you will have to disassemble the entire light diffuser assembly & re assemble.
Resolder the 12 male connections on the PCB, & slap it back together.
Cool Pix & Info
http://www.batee.com/corvette/index.shtml
To be continued, btw I posted this novel here so other's wouldn't have to go hunting for all the informational bits scattered thru the different posts.
Mike
There are 4 882 halogen light bulbs 84-88 which provide back lighting for the LCD displays... There are NO LED?s in the dash..... The 89 has different style bulbs.
The 882 bulbs are a halogen Bi-Pin bulb.. Do not get your greasy mits on the bulb or risk doing this again! The 882 bulbs are about 14 watts.
Most of the 84-89 dashes I have rebuilt need new sockets for the light bulbs , it's usually pretty toasted in there.
I would HIGHLY advise removing the dash and see what you have inside.
If your not technically inclined...have it done....
In 1989 they switched to the same light as in a normal Chevy dash (Like in the drivers info panel, larger, less wattage) . There is a 10 watt version of that bulb (Stanley 7073) and using this setup instead of the 882?s. The trick is going to a good auto parts store or junk yard and finding good lamp bases. The dash is a bit dimmer but will last longer, and your wallet will not be as light!
Removing bulbs from the front??.
I've found in the past 882's that have been in for a while are a bear to get out (through the front) and if the sockets are bad when you push the new bulb in. they disintergrate. If the sockets are ok the that is a good way to go, the Mid America kit comes complete with a hose & push stick & new sockets all that for $50.00 deal huh? (Plus s&h)
The few & the brave??.
You ?ve decided to venture into the DASH ZONE
This is a good link to removing the dash electronics out of the dashboard!
http://www.corvettemagazine.com/2001/January/dash/digidashpg1.asp
Assuming you have the back tin panel off already?
Inside the guts, there are 2 main boards
The top most one the input / output board.
The top board has the cruise control.
odometer drive circuit. Changes in this include the odometer wiring from a 2 pin red connector to a 3 pin black connector.
5-volt regulator for the CMOS chips. In 84-87? This was on a separate daughter board
later it was incorporated into the PC board.
To remove the top board there are 6 screws.
Remove the screws, and carefully lift the top board.
If your just replacing bulbs STOP HERE! Remove the old bulbs, clean the bulb connection points with an eraser ( like on the end of the pencil)?.Replace the bulbs.
The top board has a 12 pin molex style connection (female) and the bottom board has a 12 pin male
This connection fails due to poor spring contact, it builds up resistance over time.. which generates heat & melts the connection point.. No back lighting anymore, Boo Hoo!
In extreme cases the pins get so hot they slightly melt the solder connections on the lower
(Male) pins on the board. And you usually get the following
I beat on the dash? the lights come back on.
If your brave & bored.. Continue
The bottom board
Has the display electronics on it
Has the 882 sockets on it.
( there are a few flavors of this board which relate to the TACH functions)
The 84 style
The 85 with the X10 X100 display
(So 950 rpm shows up as 95 as opposed to 9 in the number window)
And the later models with Upshift and Upshift for best economy
The O/D display ( for 4+3?s)
And in 89 the 1 to 4 display
Now a warning here, If you are not careful past this point you could damage the glass LCD elements render the dash useless!
The bottom board has the connection points from the bottom of the Printed Circuit Board via the "Pink Pearl eraser contactors" ( pause for effect)
The current flow comes from the boards VIA the "Pinkies" and directly touches the edge of the glass LCD elements?. Over age & time the "Pinkies" stick to the glass & to the PCB?s?..
There are about 16 screws that hold this assy together.
Carefully lift this board up while holding the black plastic Pinkie holders down.
If you lift the glass you will have to disassemble the entire light diffuser assembly & re assemble.
Resolder the 12 male connections on the PCB, & slap it back together.
Cool Pix & Info
http://www.batee.com/corvette/index.shtml
To be continued, btw I posted this novel here so other's wouldn't have to go hunting for all the informational bits scattered thru the different posts.
Mike