Apple Performa 6400/180 - Manual (Page 219)

Additional Procedures 6500—Distinguishing Video Jitter from Blur - 11
Video Jitter Solution
If you identified a video
jitter symptom, you need to
inspect the logic board to
distinguish a reworked
board from a board that
hasn’t been reworked. Apple
has reworked 225 MHz
(P/N 661-1322) and 250
MHz (P/N 661-1332)
logic boards.
1 Remove the logic board.
2 Look at the resistor
located at R-363 on the
bottom of the board. R 363 R 363