AMSTRAD CTM644 - GT65 Main Printed Circuit Board Layout; GT65 Monitor Alignment Guide

GT65 MAIN PCB
POWER
P.C. BOARD
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GT65 ALIGNMENT INSTRUCTIONS
STEP
FUNCTION
SIGNAL IN
SIGNAL OUT METHOD REMARKS
1. 5V Adjustment.
Monitor Switched on. A.V.O. across C519. Adjust VR501 to obtain 5V.
2. 12V Adjustment. Monitor switched on. Emitter of Q502 & Earth.
Adjust VR502 to
obtain 12V.
3.
H. Hold.
Monitor switched on.
Monitor Screen. Connect Frequency Counter to CRT Heater.
Adjust L
703 to obtain 15625Hz on Frequency
Counter.
4. V. Size & Linearity.
Page Program
for
Monitor Screen. Top of the page can be adjusted with VR703 and The adjustments are Linearity
Graphics.
Bottom
of the page can be adjusted with VR702. & V. Size respectively.
5. Centering Adjustment. Program Border - 26. Monitor Screen.
Adjust
the magnet on the back of the neck to
centre the border.
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