ocr: 64 - TROUBLESHOOTING GUIDE (Continued) SYMPTOM POSSIBLE SOLUTION Cursor jumps back to home position. Check U7 (6510 MPU) Abnormal colors appear in the letters. Check U6 (2114 RAMI U16 (4066 IC) Different characters are displayed and Check U16 (4066 IC) cursor is locked when turned on and off. System does not reset and the Check U20 (556ICI RESTORE' key does not work. White band scrolls down the screen. Check External Power Supply (60 HZ HUM) VR2 (5V Regulator) Cursor disappears after the system Check U1 (6526 CIA) warms up. SYNTAX ERROR displayed after Check U3 (ROM) system warms up. Wavy scre ...
