NAD T 751 Service Manual page 22

D.
CHECK A
Fig.5. RF
waveform
Check RF Eye-Pattern.
RF : 1.5-1.6V(IC2A1 Pin 57)
YES
See the eye-pattern vivid?
YES
• Check IC201 Pin 162.
• Check the clock at the IC201 Pins 28, 30.
END
NO
Check IC2A1 Pins 5, 6, 7, 8.
Does the
NO
sawtooth waveform emit
at IC2A1 Pin 41?
YES
Replace IC201.
• Both are normal : IC201 is defective
No signal: Pick-up is defective
NO
Does the 1.6V emit?
YES
Check IC201 Pin84.
No signal at IC201 : IC201 is defective
3-11
NO
Replace IC2A1.