Hitachi HCUR700UC Service Manual page 12

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.
1 RFI (TP)
#A3 (TP)
! DMO (TP)
" FG (TP)
( I N S W N
6 TEI (TP)
2 FEI (TP)
VREF (TP)
3FOO (TP)
) O U T , T M –
– 11 –
+ T M +
8 TR– (TP)
9 TR+ (TP)
5 FO– (TP)
& FM+ (TP)
% FM– (TP)
4 FO+ (TP)
$ FMO (TP)
~ T M M
7 TRO (TP)
HCU-R700