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I'm thinking your SG316's are exactly like the SG362's.
I threw in clear chip (IVC00224) and SG363's and waited until I got the top 2 amber lites on the MPU board with door opened.
Turned off machine and reinstalled the 2 coin Double Diamond base I have for my game.
Turned on machine and VFD shows "checking memory" message then [RAM] error pops up.
Turned reset key 3 times and close the door.
[Call Attendant] message pops up, opened door, horn sounds and turned reset key twice.
Left the door opened.
[Please Wait...Testing Memory] message in VFD...reels spin and get [Machine Type Mismatch] error and [Door Open M] messages.
Closed door, message still there...no change.
Opened door and pressed test button for 3 seconds....[1 Accounting ] in display now.
Pressed "CashOut" button 6 times to get to page [7 Key Chip Config].
Pressed "Spin" button 5 times to get to [Accounting : -----]
Pressed "CashOut" button 18 times to set for .25 cents.
Pressed "MAX" bet twice to get back to [7.1.1.1.1 Accounting Denomination] page.
Pressed "CashOut" button once to get to [7.1.1.2 Coin Denomination] submenu page.
Pressed "Spin" button once to get to [Coin : -----] page.
Pressed "Spin" button one more time to light up "CashOut" button to set coin denomination to .25 cents by hitting the "CashOut" button 18 times.
Pressed the "Max"button twice to get back to [7.1.1.1 Accounting Denomination] page.
Pressed "CashOut" button twice to get to [7.1.1.3 Player Denomination] page.
Pressed the "Spin" button button once and VFD shows [Player Denom 1 $0.25]
Pressed the "Max" bet button 3 times to get back to the [7 Key Chip Config] page.
Now I've set all my denominations.
Using the "CashOut" button, I went to [7.1.6 Machine Type] and set it for an "Upright".
Tried to set WAMM/IPC in [7.1.4 WAMMM - IPC Setup] and I get the [Version Unknown] message.
I find that I cannot change anything in [7.4.1.2 Setups] although the "Spin" button is lit up.
I hit the "Spin"button all I want to try to enter the submenu but it doesn't do a thing.
When I closed the door, "Upright" error is gone on the VFD but the "Please Select WAMM or IPC unknown" and "Call Attendant" message still alternates on the VFD.
My suggestion?
Go shopping for a pair of SG363's....I'm done.
I'm re-installing my SG363's... These SG362's can go in the garbage can for all I care....lol
***UPDATE***
I Keychipped it again with a Key31. (Waited until I got 2 Amber lites on top.)
I threw bck in the Base chip (2c Double Diamond) I immediately went back to the [7.1.4 WAMMM - IPC Setup] page
I noticed the "CashOut" button allowed me to switch it between either the "WAMM" or "IPC" settings in that submenu!!
I pressed the "CashOut" button button once to choose "IPC" then hit the "Max" bet button a bunch of times to get back to the game mode and closed the door.
All the errors are gone!
The machine works perfectly!