DIAGNOSTICS Test Points and LEDs
10DEC05
DG4825-1
Page
178 of 180
Table 24 Test Points on the LASER DRIVER BOARD A17
Name Description Expected Signal
AGND Circuit ground 0.0 V DC
VN5 ------ –5.00 - –5.50 V DC
LPN Power to the LASER • LASER de-energized - 0.0 V DC
• Threshold - 0.0 V DC
• LASER energized - –5.0 V DC
LEN ----- • LASER de-energized - 0.0 V DC
• Threshold - –5.0 V DC
• LASER energized - –5.0 V DC
Iop ---- • LASER de-energized - –5.0 V DC
• Threshold - –4.25 to –4.75 V DC
• LASER energized - –3.35 to –4.35 V DC
Vpd ----- • LASER de-energized - –2.3 to –2.5 V DC
• Threshold - –2.6 V DC
• LASER energized - –2.9 V DC
Buf_BF ----- • LASER de-energized - 0.0 V DC
• Threshold - –0.06 to –0.08 V DC
• LASER energized - –1.0 to –1.2 V DC
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