EPSON Stylus Color 400 Service Manual
Rev.A
2-26
2.2.2.4 Timer Circuit
The lithium battery is mounted on the C206 main board and calculates how long the printer is not used.
The timer IC(IC5) starts counting with oscillation motivated by the CR1 using this battery as a power
source. The figure below shows connection of the Timer circuit.
The followings explain about operation of this circuit.
When the printer is on, power is supplied to the Timer IC by ap5V quickly through
the D1.
This power is also used for the power to oscillate the outer CR1. The oscillation wave form is
input to XIN terminal.
Since the oscillation wave form of CR1 is analog wave form, it is processed into the
pulse form in the Timer IC.
When the printer is turned on, the Timer IC outputs power off time as serial data to the gate
array.
Once the printer is turned off, 3VDC of BAT1(lithium battery) is supplied as power source for
he Timer IC through D7.
Since +5V at the power on is higher than +3V of the lithium battery, the power is not being
consumed from the lithium battery.
2.2.2.5 DRAM Control
In the Dynamic RAM control, output and formation of CAS and RAS control signals become necessary
in addition to the output of CS signal. The CPU TMP95C061AF not only controls that but also perform
the output of CS signal of P-ROM. Refresh timing is performed in the CAS Before RAS.
TCE
TIO
TCLK
TDATA
123
122
121
124
CS
/SCK
SIO
1
6
7
VDD
XOUT
XIN
VSS
CR1
+5V
BAT1
D7
D1
+5V
E05B44(IC2)
S-3510ANFJ
(IC5)
8
2
3
4
Figure 2-23. Timer Circuit Block Diagram
Summary of Contents for Stylus Color 400
Page 5: ...REVISION SHEET Revision Issued Data Contents Rev A February18 1997 First issue ...
Page 126: ...Chapter 6 Maintenance Rev A 6 5 No 1 No 2 10mm 2mm 2mm No 3 No 11 GEAR 34 ...
Page 138: ...EPSON Stylus Color400 Service Manual Rev A A 9 Figure A 3 C206 PSB Board Component Layout ...
Page 139: ...Appendix Rev A A 10 Figure A 4 C206 PSE Board Component Layout ...
Page 140: ...EPSON Stylus Color400 Service Manual Rev A A 11 Figure A 5 C206 PNL Component Layout ...
Page 141: ...Appendix Rev A A 12 A 5 Exploded Diagrams Figure A 6 Stylus Color 400 Exploded Diagram 1 ...
Page 143: ...Appendix Rev A A 14 Figure A 8 Stylus Color 400 Exploded Diagram 3 ...
Page 145: ...EPSON SEIKO EPSON CORPORATION ...