| NLG Users Repair Logs and Other Ramblings. Request your very own topic. Just ask any site staff. > Channelmaniac's Arcadecomponents' Old School Repair Logs |
| NEC Home Consoles - TurboGrafx-16, etc |
| (1/1) |
| channelmaniac:
Fixed: TruboGrafx-16 Symptom: Dead. Only gives light blue screen There is a definite lack of deep level hardware information on the web for this console. Thanks to this, I worked backwards and pinned out the CPU a bit (address, data, power, reset, clock) and the HuCard socket from the pinouts on the Work SRAM IC. Checked the reset line and it wasn't being held low long enough. Replaced the capacitor on the RC network feeding the reset line. Reset was working better but was not the cause of the problem. Found a bad trace on address line A2. Patched that but was getting strange signals on the SRAM with the logic probe. Replaced the IC. Signals were better looking but system was still not booting. Cleaned the card slot (folding rough paper over the end of the card, wetting it with pure alcohol, and feeding in/out repeatedly) then resoldered it. There were quite a few solder connections on the connector that were cold - they bubbled when heated - which had to be desoldered and resoldered. Game now boots and plays. |
| channelmaniac:
Here are the pinouts for the HuC6280A CPU (a modified 65SC02) and the HuCard. Keep in mind that these were reverse engineered from the pinout of the SRAM IC, power and ground connections, as well as the clock and reset connections. It is said that the HuCard has the same pin connections as a JEDEC style EPROM so I used that in labeling some of the higher address pins. Email or PM me if you have any info that can be used to update these. CPU: --- Code: ---1 - A5 2 - A4 3 - A3 4 - A2 ? 5 - A1 6 - A0 7 - GND 8 - VCC 9 - 10 - CLK 11 - RESET* 12 - 13 - 14 - ?? HU #35 15 - VCC 16 - GND 17 - 18 - 19 - VCC 20 - 21 - GND 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - GND 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - ?? HU # 37 44 - 45 - 46 - 47 - VCC 48 - GND 49 - D2 50 - D1 51 - D0 52 - D3 53 - D4 54 - D5 55 - D6 56 - D7 57 - VCC 58 - GND 59 - 60 - 61 - SRAM CE1* 62 - SRAM OE* 63 - SRAM WE* 64 - ?? HU #24 65 - ?? HU #3 66 - A18 ? 67 - A17 ? 68 - A16 69 - A15 70 - A14 71 - A13 72 - A12 73 - A11 74 - A10 75 - GND 76 - VCC 77 - A9 78 - A8 79 - A7 80 - A6 --- End code --- HuCard: --- Code: ---1 - Back panel connector: pin C3 2 - Audio in ?? Back panel connector: B1 3 - CPU # 65 ?? 4 - A16 5 - A15 6 - A12 7 - A7 8 - A6 9 - A5 10 - A4 11 - A3 12 - A2 13 - A1 14 - A0 15 - D7 16 - D6 17 - D5 18 - GND 19 - D4 20 - D3 21 - D0 22 - D1 23 - D2 24 - CPU # 64 ?? 25 - A10 26 - SRAM OE* ?? SAME AS SRAM's OE* 27 - A11 28 - A9 29 - A8 30 - A13 31 - A14 32 - A17 ?? 33 - A18 ?? 34 - SRAM WE* ?? SAME AS SRAM's WE* 35 - CPU # 14 ?? 36 - RESET* 37 - CPU # 43 ?? 38 - VCC --- End code --- |
| channelmaniac:
Model: Turbo Express Symptom: No video on screen Replaced 2 leaking surface mount electrolytic capacitors. Tested. |
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