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Amstrad CTM-640 Maintenance Guide
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== Alignment and voltages == The CTM640 alignment instructions on p. 23 have the same eight steps and figures as the CTM644's, with the monitor connected to a CPC464: Q802 collector at 120 V, a 145 mm paper edge with VR406, focus on the line output transformer, 5 V across C518 with VR501, and VR404 to 14,500 Hz then VR403 to 15,625 Hz.<ref name="sm464" /> The step-by-step table is in the [[Amstrad CTM-644 Maintenance Guide#Alignment|CTM644 guide]]. The voltage chart on p. 24 gives the same readings as the CTM644 chart for IC401 (LA7800), IC402 (printed as Β΅PC1378H), IC502 (18 V in, 5.0 V out), Q404 and Q405 (collector 98.8 V).<ref name="sm464" />
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