Digital Equipment VR320 - VR320 Refresh Rate Configuration; Procedure to Change VR320 Refresh Rate

5
Changing Refresh Rates
This chapter describes how to change the monitor refresh rate.
5.1 Refresh Rates of VR320 Monitors
Table 5–1 lists the different VR320 models and their refresh rates.
Table 5–1 Refresh Rates of Monitor Models
Model Pixels x Lines Refresh Rate Applicable Area
VR320-CA 1280 x 1024 66 Hz Northern Hemisphere
VR320-C4 1280 x 1024 66 Hz Southern Hemisphere
VR320-DA 1280 x 1024 72 Hz Northern Hemisphere
VR320-D4 1280 x 1024 72 Hz Southern Hemisphere
5.2 Changing the Refresh Rate
If you change the monitor refresh rate to meet the needs of a different
system from the one ordered, use the following procedure:
1. Change the refresh switch on the deflection module (Figure 3–12).
2. Change the refresh jumper on the power supply module (Figure 3–24).
3. If necessary, adjust the VHOLD, VLIN and VCEN controls until the
display height is 273 mm (Figure 4–13).
4. If necessary, adjust the HEIGHT (Section 4.5.3), HPHASE, HLIN, and
HCEN controls (Section 4.5.4).
5. If necessary, adjust the WIDTH (Section 4.5.5), PIN (Figure 4–20),
and TRAP (Section 4.5.7) controls.
6. If necessary, adjust the focus (Section 4.5.8).
5–1