Frontier LP7700 - Page 840

6. Electrical parts
66010
2/3
66010
Description of PCB (printer section)
IMPORTANT
• For precautions when handling optical fiber cables and LVPECL cables, see ☞68100.
!
!!
! Unused connector
!
!!
! Component parts table
Connector No. Purpose Remarks
CN1, CN5, P1510, P1534 Unused
• Although test pins except T5 and T7 are unmounted, the test points can be used for the measurement.
TP Purpose When the normal value (# V) is not detected Symptom
TP1 DC+5 V voltage measurement
• Power supply for digital circuits such
as ARCNET, FPGA, memory, and
CPU
• Failure in the cable connection between the
printer power supply 5 and laser control
PCB.
• Failure in the printer power supply 5 and
laser control PCB.
• It shorted out between the laser control PCB
and the laser. (J/P1509, J/P1515, J/P1519)
•
☞No. 06901 ARCNET
communication error.
occurs.
TP2 DC+24 V−1 voltage measurement
• Power supply for the polygon mirror
driver
• Failure in the laser power supply, failure in
the cable connection between the laser power
supply and laser control PCB
• Failure in the laser power supply and laser
control PCB.
• It shorted out between the laser control PCB
and the laser. (J/P1515)
The polygon mirror does not
operate.
TP3 DC+24 V−2 voltage measurement
• Power supply for the B laser heater
and R laser heater
• Power supply for the laser unit
• Failure in the laser power supply and laser
control PCB.
• Failure in the laser power supply, failure in
the cable connection between the laser power
supply and laser control PCB
• It shorted out between the laser control PCB
and the laser. (J/P1532)
• It shorted out between the laser control PCB
and the AOM driver. (J/P1543)
• The temperature of the B
laser heater and R laser
heater cannot be adjusted.
• The laser does not emit
light.
TP4 Ground −−
TP5 Ground −−
TP6 Ground −−
TP7 Ground −−
TP8 Ground −−
TP9 DC+24 V-IL voltage measurement
• Power supply for the laser unit
• Failure in the cable connection between the
laser control PCB and the F-AOM driver
• Failure in the interlock switch (printer top
cover)
• Failure in the laser control PCB
The laser does not emit light.
TP10 DC-12 V voltage measurement
• Power supply for the laser unit
• Failure in the laser control PCB
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