Sony PMC-MD55 Service Manual page 29

4. ALL SERVO ON Mode 1
(RF Level and Jitter Confirmation 1)
1. Press the fl button four times to enter the ALL SERVO [ ]
ON mode 1 (start playback the disc) and display as below.
(All servo ON. LPC ON)
Display
21 07
ALL
2. Connect an oscilloscope to TP (RFO) and TP (VC) on the
MAIN board.
Connection:
MAIN board
TP (RFO)
TP (VC)
3. Confirm that the RF level and jitter of waveform satisfy speci-
fied values as follows.
RF signal waveform
Specified Values:
RF level : 1.0 to 1.4 Vp-p
jitter : less than 9 nsec
Connecting Location: MAIN board
5. ALL SERVO ON Mode 2
(RF Level and Jitter Confirmation 2)
1. Press the fl button to enter the LPC OFF mode and dis-
[ ]
play as below. (All servo ON. LPC OFF)
Display
21 07
2. Confirm that the RF level and jitter of waveform satisfy speci-
fied values as follows.
Specified Values:
RF level : 0.8 to 1.4 Vp-p
jitter : less than 9 nsec
If the RF level and jitter are out of specifide values, measure
again after clean the object lens by an applicator with lens
cleaning liquid.
00 3A0
oscilloscope
(DC range)
+
–
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
RF level:
1.0 to 1.4 Vp-p
00 3A0
6. Releasing the CD Test Mode
1. Press the π (CD) button to stop rotate the disc.
[ ]
[POWER]
2. Press the
player unit) to release the CD test mode and turn to standby
state.
Connecting Location:
– MAIN BOARD –
(Component Side)
TP (TEO)
TP (VC)
IC701
– 29 –
[RESET]
button or switch (bottom of the
TP (RFO)