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Amstrad CTM-640 Maintenance Guide
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== Opening and supply checks == Remove the four screws holding the rear cabinet, as on the CTM644.<ref name="cpcai">JΓΆrg Gurowski, "Hinter Glas β Ein Blick in den Farbmonitor des CPC", ''CPC Amstrad International'' (1992). Transcribed at [https://cpcrulez.fr/hardware_dossier-ctm-ein_blick_in_den_farbmonitor_des_CPC_AI.htm CPCrulez]. Retrieved 2026-10-01. In German. Covers the CTM644 and CTM640.</ref> The mains fuse is F501, 2 A time-lag. The only output is 5 V to the computer, set with VR501 to exactly 5 V measured across C518; Amstrad's note says this setting should not be disturbed under normal conditions.<ref name="sm464" /> Amstrad's fault chart for a dead CPC 464 checks the monitor's mains fuse, then the DC output and lead, then the computer.<ref name="sm464" />
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