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(5) VSVD control
This control artificially changes the power-supply voltage to check whether the power-supply voltage
detection function is working properly.
Note that in a model that can detect 16 voltage levels, one position on this control indicates two
voltage values. The set power-supply voltages increase when the control is turned clockwise and
decrease when the control is turned counterclockwise.
SVD level
0
8
(For example, SVD levels 0 and 8 fall on the same control position.)
(6) VLCD control
This control is used to adjust the LCD power supply voltage, and can be used only with models
whose LCD drive voltage is biased 1/2 or 1/3. Note, however, that an actual IC in almost all cases has
its LCD drive voltage fixed; therefore, be careful with the LCD drive voltage. The LCD display
becomes dark when the control is turned clockwise and becomes light when the control is turned
counterclockwise.
(7) CR oscillation frequency adjusting control
This control allows, adjustment of the CR oscillation frequency using a screwdriver, etc. The adjust-
ment range is approx. 30 kHz to 190 kHz for the OSC1, and approx. 190 kHz to 2.6 MHz for the OSC3.
Note that not all actual ICs operate in this frequency range. Therefore, consult the technical hardware
manual to ensure that the oscillation frequency is adjusted within the stipulated frequency range. The
oscillation frequency increases when the control is turned clockwise and decreases when the control is
turned counterclockwise.
Further, the actual IC does not support CR oscillation for both OSC1 and OSC3.
S5U1C63007P MANUAL (PERIPHERAL CIRCUIT
BOARD FOR S1C63557/63558/63567)
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EPSON
CHAPTER 4: NAME AND FUNCTION OF EACH PART
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