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Posizione regolatori di servicio
Back
Front
Side
Side
Output TTL level
Door
| | |
| | | | |
/
TP.6 (DAC CORRECT)
Frequency
R403" Ss:
Gj
counter
—
(DAC initial)
7
\
G (GND)
PC
PA
PD
PS
PP
+
TP.11 (TDET)
7
TP.5 (EF) @
TP.4 (SEF) @
Oscilloscope
TP.G (GND)
Frequency
@ TP1
] RO 21 (Laser diode output)
@—TP.3 (AS)
@ "— TP.2 (MCK)
ROT
|__tpy (PS)
GND
Digit.
|
Voltmeter
[+
—~/
Cut off
+>
Fig. 27
PD-Board
Fig. 26
PP-Board
600 mV (EFM Signal)
|
R 289 (Disc motor hall (A) offset)
@ TP.2 (TR ER)
|
| R 284 (Disc motor haii (B) offset)
(
|
I
|
I
|
I
|
Oscilloscope
I
|
I
I
I
TP.8 (DMGND)
GND
[]revs (Disc motor hall al
Fig. 1
TP.10 (DMCB)
Pot ee
t an
E ssp)
i
TP.3 (GND)
Signal
Oscilloscope
TP.12 (TR GAIN)
Generator
|
Resurge graph
TP.6 (AF @)
for tracking
servo
OC
|
gain adjustment
| TP.7 (TR @)
—_—
TP.4 (AF
x
Y
(AF
©)
Correct
[|p 152 (Tracking servo gain)
TP.5 (TR ©)
Incorrect
R 100 (Focus servo gain)
SIG.GEN O.SCOPE
FOCUS
6
TRACKING
O
(|
f=2 KHz
f=1,8 KHz
S5OO66
[]R102 (Fi
ffset)
©
©
©
ocus servo
offse'
Incorrect
©
©
©
6
6
6
©
.
80 Vi
+
Fig. 2
028 Vrms
Phasenmischer
Fig. 28
PS-Board
phase shift circuit
mescolatore di fasi
61
MeBpunkte - Test Points - Points Test - Punti di misura
AF error signal
EFM
s i
P4 (AF -)
signal at PAUSE
TP11 (TDET)
NEEM signal
TP11 (TDET)
TR error signal
4
'P2 (DMCB)
TR error signal
TPS (TR-)
Detection SYNC signal
TP3 (A SYNC}
EFM signal
is
Suppl
tary
SYNC
signal
TP11 {TDET)
upplementary
signal
TP1 (P SYNC)
1imSec/DIV
Disc motor A
C1 signal
drive signal
TP7 (C1)
TP9 (DMCA)
(-—l-I-
-l.-1-
tT
i e
Cas aes
ae eae
10mvV/DIV
1mSec/DIV
DA regulating signal
TP6 (DAC CORRET)
7 aman |
T
TT
Tend
T
Tt
0.1 Sec/DIV
62
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