CHAPTER 4: NAME AND FUNCTION OF EACH PART
S5U1C63002P MANUAL
EPSON
7
(PERIPHERAL CIRCUIT BOARD FOR S1C63158/63358)
(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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
(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. 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
When you choose a CR oscillator on the S5U1C63002P board, you can use this control to adjust the CR
oscillation frequency by using a screwdriver, etc. The adjustment 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.
