Editing Super Famicom Maintenance Guide (section)

=== TC1 and the master clock ===

'''TC1 is a trimmer capacitor, and it is adjustable.''' If a console has poor or no colour and everything else checks out, Nintendo's remedy is to set the master clock at TC1 — and the target frequency depends on the television standard the console was built for, because the NES and SNES derive colour from a master clock at six times the colour subcarrier.

The Playtronic manual is a Brazilian document and therefore gives the '''PAL-M''' figure: approximately '''21.453666&nbsp;MHz'''. Its colour-fault tree tells the technician to check the oscillation frequency first, and if the adjustment is impossible or unstable to replace TC1 and then X1.<ref name="nintendodiag" />

For other markets the corresponding master clock frequencies are '''21.47727&nbsp;MHz''' on an NTSC or Japanese machine, and a '''17.734475&nbsp;MHz''' crystal on a European PAL SNES, from which the S-CLK chip synthesises the PAL master clock.<ref name="fullsnes" />

Do not apply the Brazilian figure to a Japanese or North American console: they are close enough to look plausible and far enough apart to give you a colour fault.