DIGITAL CLOCK MODEL CLK100
GEKCO INC.
Rev 1.1
17
( )
Locate the RTC module and install on
the clock main board as shown.
RTC Module
Figure 11 RTC Module Assembly
6.
Initial Tests
Before installing the IC’s perform the following
tests.
Display Board
Using a multi-meter to measure resistance
perform the following checks.
( )
Verify that the resistance with the
positive lead on C1 positive pin and negative
lead on C1 negative pin, is greater than 2k
ohms.
Main Board
( )
Verify that the resistance with the
positive lead on D1 cathode ( the component
end with the band) and negative lead on the
ground pad TP1, is greater than 2k ohms.
IC INSTALLATION.
NOTE: You will install the following IC’s on the
main circuit board.
CAUTION: Integrated circuits (IC’s) are
complex electrical devices that perform many
complicated operations in a circuit. These
devices can be damaged during installation.
Read all of the following information before you
install the IC’s.
Some of the IC’s you will install in the following
steps are MOS {metal oxide semiconductor)
devices. Be sure they do not get damaged by
static electricity. Once you remove the IC from
the foam pad,
do not let go of it
or lay it down
until it is in its socket. Install it as follows. Read
all of the following steps before you pick up an
IC.
1. Pick up the IC and touch the foam pad
with both hands.
2. Hold the foam pad with one hand and
remove the IC with the other hand.
3. Continue to hold the IC with the one hand
and straighten any bent pins with the other
hand.
4. The pins on the IC’s may be bent out at an
angle as shown in A, and if this is the case,
they will not line up with the holes in the IC
socket or circuit board pads. Lay the IC
down on its side as shown in B and very
carefully roll it toward the pins to bend the
lower pins into line. Then turn the IC over
and bend the pins on the other side in the
same manner. Do not try to install and IC
without first bending the pins as described.
To do so may damage the IC pins or the
socket, causing an intermittent contact.
Install the IC on the display circuit board. Be
sure to line up the dimple with the circuit board
silkscreen
( ) U1: MAX7219 IC
Install the IC on the main circuit board:
( ) U1: ATMEGA328P IC
This completes the assembly of the circuit
boards.
Содержание CLK100
Страница 29: ...DIGITAL CLOCK MODEL CLK100 GEKCO INC Rev 1 1 29 Figure 25 Display Board Bottom Side...
Страница 30: ...GEKCO DIGITAL CLOCK P N CLK100 ASSEMBLY OPERATION MANUAL 30 REV 1 1 GEKCO INC 14 Schematic Main Board...
Страница 31: ...DIGITAL CLOCK MODEL CLK100 GEKCO INC Rev 1 1 31 15 Schematic Display Board...
