Hu6260
Contents
Pinout
NEC / Hudson GPU
Pinout source: TurboGrafx 16 Service Manual Schematic
Jailbar / Vertical Bar Fix
Original credit for this modification: Tim Worthington
Under certain circumstances, vertical bars may be visible on PC Engine / TurboGrafx consoles. This is due to insufficient capacitance on the analog and digital 5V supply for the 6260 chip.
The solution is to increase the capacitance on each 5v supply rail. This is easily accomplished using modern surface mount capacitors.
To simplify the location process, our notes below list one set of visible caps are are farthest from other parts. On many PCBs there are actually 3 per 5v rail to choose from [1].
As of February, 2017, all of our cap kits and RGB kits come with 2 surface mount ceramic caps to perform this simple modification! We also supply these caps in bulk quantity.
Jailbar Fix Locations
Non-CD Systems
- PC Engine (Original, White)
- C134 and C120
- PC Engine (Original, White) Later PCBs
- C121 and C135 (See Core Grafx photo below)
- PC Engine Core Grafx / Core Grafx II
- C121 and C135
- PC Engine Shuttle
- Replace C134 and C133
- TurboGrafx 16
- Add cap in parallel between the legs of ceramic disc caps C128 and C137
- SuperGrafx
- Replace C168, C169
PC Engine (Original)
PC Engine (Original, later revisions) / Core Grafx / II
PC Engine Shuttle
Super Grafx
Handheld / Portable Systems
- Turbo Express
- C709 and C715. Improves quality of LCD modded units.
- PC Engine LT
- Might not be necessary, unsure of original parts as the LT 5v rail cap arrangement is different from other PC Engine hardware. See image for possibilities. The LT appears to have 1 or 2 factory caps per rail but we don't have an LT to run continuity checks on.
Turbo Express / PC Engine GT
PC Engine LT
CD-based Systems
- Turbo Duo (PWA-3321-A)
- C923 and C908
- PC Engine Duo (PWA-3321-A)
- C923 and C908
- PC Engine Duo-R (PWA-3339-A)
- C903 and C909
- PC Engine Duo-RX (PWA-3365-A)
- C903 and C909
Turbo Duo, PC Engine Duo (PWA-3321-A)
PC Engine Duo-R (PWA-3339-A), PC Engine Duo-RX (PWA-3365-A)
LaserActive
- NEC_PAC-N10
- C526 and C529
PAC-N1, PAC-N10
RGB Buffer / Amplifier
Discreet Component Version
The discreet parts kits are no longer available, but we do carry a few alternatives
RGB signals are present in TurboGrafx, TurboDuo, PC Engine, etc. consoles but need to be buffered. Attempting to drive a monitor directly will likely result in image loss or sync loss on high brightness images.
- Parts List:
- 2SC1815 (x4)
- 10KΩ (x8)
- 300Ω (x1)
- 75Ω (x4)
- 10Ω (x3)
- 220µF, 6.3v (x4)
- 10µF, 10v (x6)