When is a ROM bad?
A ROM was dumped correctly when the CRC32 was found and the ROM was renamed to no-intro standard.
Saving to GB/ROM/ZELDA DIN/780/...
[*******************]
Checksum: FE8F -> OK
CRC32... D7E9F5D7 -> Legend of Zelda, The - Oracle of Seasons (USA, Australia).gbc
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In contrast a bad dump will trigger a "Not found" after the CRC32 and the LED will turn red.
Saving to GB/ROM/ZELDA DIN_A_7/779/...
[*******************]
Checksum: 46B4 != FE8F
Invalid Checksum
CRC32... 2B99EF7E -> Not found
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That being said, the databases are not perfect so in rare cases instead of a bad dump it also could be an unknown ROM version or a database error. Also not all systems have no-intro databases on the SD card yet.
Cleaning
In case of a bad dump the first thing you should do is to clean the cartridge with rubbing alcohol and a q-tip until the q-tip does not turn black anymore. You can also insert the cartridge repeatably to mechanically clean the cartridge slot. The game playing fine in a console does not mean it will dump correctly since the OSCR does not perfectly mimics a console.
Log File
You will find a OSCR_LOG.txt in the root folder of the SD card. This file saves all the output displayed on the screen. If you need to ask for help you should always add at least part of the log file to your post. It holds important info like HW and firmware version.
OSCR HW5 V12.4
[+] Game Boy
[+] Game Boy (Color)
HEADER CHECKSUM ERROR
Press Button to
ignore or clean
cart and try again
Title: ZELDA DIN_A_7
Revision: 0
Mapper: MBC5
ROM Size: 32 KB
Save Size: 8 KB
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[+] Read ROM
Saving to GB/ROM/ZELDA DIN_A_7/779/...
[*******************]
Checksum: 46B4 != FE8F
Invalid Checksum
CRC32... 2B99EF7E -> Not found
Press Button...
Self Test
If you just soldered the OSCR together there might be some bridged pins. You can run the Self Test to check.
Self Test
Remove all Cartridges
before continuing!!!
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Testing 1K resistor
Testing short to GND
Testing short between pins
Error: Pin A12 + D49
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Video of the Self Test:
(10K resistor in SNES slot to simulate short-circuit, pin descriptions use the Arduino pin names out of the schematic)
Once you know what pins are bridged together you can consult the schematics to find out where they are located on the PCBs.
Updating to the latest Github code
It might be that the current portable release is behind the active development tree and your issue was already solved in the meantime.
To update to the latest Github code you can download and extract the current portable release VXX.X_Portable.zip and the latest development tree and then copy all the *.ino files from cartreader-master.zip\cartreader-master\Cart_Reader\ to VXX.X_Portable\Arduino IDE Portable\portable\sketchbook\Cart_Reader. Then follow the update guide.
Black Screen (Mega2560 Pro receives power)
If you just get a black screen after turning the OSCR on but the Mega Pro LEDs do light up indicating it does have power then you can change the output to Serial Monitor to get some additional information.
Cartridge Reader
2023 github.com/sanni
SD Error
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If you then also get an SD error over Serial you need to check the SPI pins D50-D53 both on the Mega Pro and the Main PCB's EXP2 header.
Black Screen (Mega2560 Pro does not receive power)
If the status LED on main PCB lights up but the display stays dark and the LEDs on the Mega Pro 2560 also don't light up then you might have forgotten to solder the J1 jumper on the back of the main PCB.
Schematics
Main PCB:
Six Slot Adapter:
