HITACHI HCUR700W
Service Manual

HCU-R700

C H E C K I N G T H E WAV E F O R M S
To check the waveforms on the SERVO P.W.B., the GND (�) probe of the Osilloscope to � ref� point. NOTES MEASURING DISC : DVD / DVDT-S01 CD / TCD-784A (It is better to use wires for extending between the probe and test points.) � When watching the HF waveform, use the extending wire as short as possible. � When HF waveform is noisy or can not discriminate the eye-pattern, replace the Traverse Unit after measuring the Iop. � Test points 1 ~ $ are shown below.

)OUT

,TM�

+TM+

1 RFI (TP) #A3 (TP) ! DMO (TP) " FG (TP) (INSWN 6 TEI (TP) 2 FEI (TP) VREF (TP) 3FOO (TP)

8 TR� (TP) 9 TR+ (TP) 5 FO� (TP) & FM+ (TP) % FM� (TP) 4 FO+ (TP) $ FMO (TP) ~TMM 7 TRO (TP)

� 11 �