TM 5-6675-319-14
(4) The +10 kV power supply is not field-repairable and must be replaced as
a u n i t .
It is located at the bottom rear of the printer subassembly. The high-
voltage box, located in the front of the printer subassembly, has the following
adjustments:
Accelerating anode calibration adjust R120 is used to adjust for the
presence of light on the CRT.
Focus control adjust R123 adjusts for fine raster
l i n e s .
Focus calibration adjust R124 (factory set) is used to adjust raster lines
u n t i l t h e y t o u c h.
Beam current adjust R23, located on card 3CC1, is used to control
the CRT beam current, normally 200-250 MA, in the test mode.
(5) PMT digital meter M101 is used to monitor the PMT current when cali-
brating in the test mode for density of printing material. PMT SENSITIVITY adjust
R106 is used to adjust PMT current to -50µA.
(6) The test mode of operation is selected by setting MODE switch S103 to
TEST. The test mode is utilized when setting the printer up for various printing
operations and testing .
In the test mode, the PMKT output is not used to drive the
fast axis sweep.
The PMT output is applied to PMT digital meter M101 to set PMT
s t a t i c c u r r e n t .
The fast axis sweep is driven by a gating circuit, consisting of
Q3, Q4, and associated circuitry, on card 3C2.
The gating circuit supplies a fixed
current of -50µA to drive the fast axis integrator and causes the spot to sweep the
CRT at a higher fixed rate.
In TEST, MODE switch S103 applies -12.5 V to the output
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