Sinclair ZX SPECTRUM+ - Corrupt Paper, after ULA Change; Initial Check; No 3 Mhz at IC2 Pin 6

Sinclair ZX Spectrum Service Manual
Spectrum For Everyone https://spectrumforeveryone.com/
32
6.3 CORRUPT PAPER, AFTER ULA CHANGE
6.3.1 Initial Check
Check IC1 socket
Check PWR socket is not intermittent
Check IC1 pin 14 for +5V with no discernable ripple
6.3.2 No 3MHz at IC2 pin 6
Low amplitude - check R25
Check TR3
Check IC1 pin 32 for 3MHz
Check IC1 pin 39 for 14MHz
Check crystal X1
Check IC1 pin 13 for +3V
6.4 VIDEO INCORRECT
6.4.1 Dark Screen
Check tuning
Change modulator
6.4.2 Dim ‘Sinclair’ logo
Check +12V
Check C65 for high impedance
Check R52
Check +5V on IC14 pin 3
6.4.3 Wavy lines across screen
Press down on each electrolytic capacitor to see if lines disappear. If so change that capacitor
Check crystal X2
Check/change TR1 and/or TR2
Check/change IC14
6.4.4 Self-resetting
Check TR6
6.4.5 Random dynamic squares
Change C54
Paper area too low
Change IC1
6.4.6 Diagonal lines in the border area
Change R47