634
Meaning : 322GS CAL sensor does not receive laser beam (main reasons status 08/98:
1) If old DA converter is installed (black or golden lid) most likely D/A converter on laser control board 134GS defective. Check output of laser control board like described below. Replace laser control board if output is not o.k.) 2) At SW versions LTP1305 and 1405 the test whether beam is present is already done after 6 secs after switch on. If the laser tube is switched on at very low temperature (<15汣) it may take more than 6 secs. until the tube is on. At LTP01509 this test is done after 40 secs, avoiding error message 634.)
3) Wrong message due to a mixup of different tasks at startup. No real hardware error. Disappears after reset(only for SW < LTP18XX): Upgrade to SW LTP_1A04* or higher 4) Wrong message due to a delayed ignition of the laser tube. No real hardware error. Disappears after reset(only for SW < LTP18XX): Upgrade device SW to LTP_1A04* or higher. *Order Numbers: -CM+9.8394.3623.0 DIL EPROM (for RK188 + installed in type 8390 and 8391, type 8394/300 up to SN2768 and type 8394/600 up to SN4670) -CM+9.8394.3577.0 Flash Eprom (for RK188 pro installed in type 8394/300 as of SN2769 and type 8394/600 as of SN4671).
Remark : First of all test if laser beam is present in the film plane with the service program (repair - tests - print engine - AOM test - bright). If beam is not present in the filmplane check if laser tube works: insert a firm piece of paper between laser tube and pre scan cover. ---No beam present:--- Reason : 402GS (Power supply for laser tube) defective
Cure : Check fuse 400 Si2. Check voltage 2,5 kV by connecting a spare high voltage power supply 402 GS at the laser tube. Reason : 300EL (HE-NE laser tube) defective Cure : Replace HE-NE laser by changing "pre scan unit" Reason : 308GS AOM defective. Cure : Check 118GS (AOM driver) like described below. If it is o.k. dismount pre scan cover and check beam in the optical path after diaphragm. Service program: AOM bright.
If beam is not present behind diaphragm exchange 308 GS (AOM) by changing "pre scan unit". Adjust AOM driver afterwards. If beam is present check laser optical path for alien element or broken part. ---Beam present:--- Reason : 300M1 (polarized filter motor) or 314GS (I/O Bus laser calibration board) defective. Cure : Check polarized filter motor with service software.
Check voltage (8V ripple) for polarized filter motor on 314GS (laser calibration board). Remark : Replace 314GS (laser calibration board) and 322 GS Cal sensor always together Cure : Check fuses Si1/Si2 in 130GS (Power Supply Print Engine) Cure : Check voltage on 130GS (Power Supply Print Engine): +/- 18V DC Reason : 118GS (AOM-driver board) or 134GS (I/O Bus laser control
board defective). Cure : Check +/-18 V DC and fuses Si1 and Si2 on 130GS (power supply print engine) Cure : Check +25 V DC and fuse Si3 on 130GS (power supply print engine). If fuse is blown check the current supplied to the AOM driver. If the current is higher than 400 mA exchange the AOM driver and adjust the new board. Cure : Check 134 (GS I/O Bus laser control board) output: - connect a T-piece at video plug on 118GS AOM driver
- check voltage with oscilloscope and service program: (repair - tests - printengine - AOM test) AOM off ---> appr. -360mV (+/-60 mV) AOM bright ---> appr. +460mV (+/-60mV) Cure : Check output (RF) of 118GS (AOM driver board) with oscilloscope - switch laser imager off - plug in a T-connector at 118GS (AOM driver) output - switch laser imager on and check voltage with oscilloscope and service program:
AOM off ---> appr. 0V, 80 MHz AOM bright ---> appr. 15 V, 80 MHz Reason : 300MG1 (lifting magnet), 322GS (Cal sensor) or 314GS (laser calibration board) defective. Cure : Check lifting magnet with the service program. Calibrate with the service program to different values up to 254. Remark: Replace 314GS laser calibration board and 322GS cal sensor always together.
Reason: : Wrong message due to a mixup of different tasks at startup. No real hardware error. Disappears after reset(only for SW < LTP18XX). Cure: Upgrade to SW LTP_1A04* or higher *Order Numbers: -CM+9.8394.3623.0 DIL EPROM (for RK188 + installed in type 8390 and 8391, type 8394/300 up to SN2768 and type 8394/600 up to SN4670) -CM+9.8394.3577.0 Flash Eprom (for RK188 pro installed in type 8394/300 as of SN2769 and type 8394/600 as of SN4671). |