Sony PMC-MD55 - Md Boombox, Service Manual

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4. ALL SERVO ON Mode 1
(RF Level and Jitter Confirmation 1)
1. Press the
7
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
2. Connect an oscilloscope to TP (RFO) and TP (VC) on the
MAIN board.
Connection:
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 7 button to enter the LPC OFF mode and dis-
play as below. (All servo ON. LPC OFF)
Display
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.
6. Releasing the CD Test Mode
1. Press the s (CD) button to stop rotate the disc.
2. Press the
[POWER]
button or
[RESET]
switch (bottom of the
player unit) to release the CD test mode and turn to standby
state.
Connecting Location:
– MAIN BOARD –
(Component Side)
21 07 00 3A0
ALL
+
–
MAIN board
TP (RFO)
TP (VC)
oscilloscope
(DC range)
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
RF level:
1.0 to 1.4 Vp-p
21 07 00 3A0
TP (TEO)
TP (VC)
TP (RFO)
IC701