Adjustment Procedures
TDS 420A, TDS 430A & TDS 460A Service Manual
5-21
Monitor Assembly Adjustment
WARNING. High voltages are accessible on the A26 Monitor assembly. Do not
touch the circuit board if the power is applied. Do not touch the CRT anode
button even if the power cord is r emoved. Wear safety glasses when working with
the CRT.
Do not do this procedure when performing a routine adjustment. Only do this
procedure if the display on the monitor assembly has become unsatisfactory. See
Complete Adjustment on page 5--2.
CAUTION. Static electricity can damage this circuitry. When standing the CRT on
its front panel place it on a clean padded surface.
The equipment required to do this procedure is listed in Table 5--3.
Equipment
Required
One J17 Photometer with a J1803 Luminance Probe (Item 17)
One monitor adjustment tool (Item 4)
1. Access the inside of the oscilloscope: See the Removal and Installation
Procedures starting on page 6--9 to remove the cabinet.
2. Adjust the vertical and horizontal sync:
a. If the display rolls vertically adjust V. SYNC (R453) to the center of the
stable display range. (See Figure 5--11. )
b. If diagonal lines are present on the display adjust H. SYNC (R473) to
the center of the stable display range.
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