service information for eeprom ic setting - Jordans Manuals
service information for eeprom ic setting - Jordans Manuals
service information for eeprom ic setting - Jordans Manuals
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DESCRIPTION OF CIRCUIT<br />
1. ALPC (AUTOMATIC LASER POWER CONTROL) CIRCUIT<br />
1-1. BLOCK DIAGRAM<br />
LPM 101<br />
Opt<strong>ic</strong>al<br />
P<strong>ic</strong>k-up<br />
LPC-812R<br />
LD<br />
PD<br />
LDD<br />
LIC 121 AN22113A<br />
LIC 201<br />
124<br />
MN103SA6G<br />
APC<br />
Ave<br />
S/H2<br />
127 FPDM<br />
LPF<br />
M<br />
Erase P<br />
19 VGA S/H3<br />
X<br />
A/D<br />
VREFPD<br />
FM 123<br />
VPD<br />
D/A<br />
D/A<br />
D/A<br />
D/A<br />
D/A<br />
D/A<br />
Serial<br />
I/F<br />
VGA<br />
S/H1<br />
40 41 42<br />
SH3 SH2 SH1<br />
Space<br />
Write<br />
Strategy<br />
S/H<br />
Signal<br />
ADSC<br />
1-2. ALPC (AUTOMATIC LASER POWER CONTROL) CIRCUIT OPERATION<br />
THE ALPC BLOCK DETECTS THE LASER OUTPUT POWER OF THE FRONT MONITOR. THE POWER SIG-<br />
NAL DETECTED WITH THE PD FOR FRONT MONITOR<br />
DETECTION IS INPUT THE VOLTAGE FROM THE VPD PIN(123PIN) OR THE FPDM PIN(127PIN), THE REF-<br />
ERENCE SIGNAL OF THE INPUT SIGNAL IS<br />
INPUT FROM THE VREFPD PIN(124PIN). THE ALPC BLOCK GENERATES THE SINGALS FROM THE INPUT<br />
LASER POWER SIGNALS IN THE<br />
FOLLOWING DETECTION SYSTEMS. THIS BLOCK HAS FOUR DETECTION PATHS:ALL AVERAGE VALUE<br />
PATH, MULTI PULSE AVERAGE/PEAK VALUE<br />
DETECTION PATH, ERASE/BOTTOM VALUE DETECTION PATH, SPACE/PLAYBACK POWER VALUE<br />
DETECTION PATH.<br />
4-34
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