Service manual

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KB-5121KS/K/W
1 P96 IN Signal coming from Transparent electrode (touch key on the LCD).
When the 1 key of the transparent electrode is touched, a corresponding signal out of
OUT1 of IC-2 will be input into P96 of IC-1.
2 P95 IN
Signal coming from Transparent electrode (touch key on the LCD).
When the 2 key of the transparent electrode is touched, a corresponding signal out of
OUT3 of IC-2 will be input into P95 of IC-1.
3 P94 IN Signal coming from Transparent electrode (touch key on the LCD).
When the 3 key of the transparent electrode is touched, a corresponding signal out of
OUT4 of IC-2 will be input into P94 of IC-1.
4 P93 OUT The signal to adjust the contrast of LCD is output to IC-5.
5 P92 IN Signal coming from Transparent electrode (touch key on the LCD).
When the 4 key of the transparent electrode is touched, a corresponding signal out of
OUT1 of IC-3 will be input into P92.
6 P91 IN Signal coming from Transparent electrode (touch key on the LCD).
When the 5 key of the transparent electrode is touched, a corresponding signal out of
OUT3 of IC-3 will be input into P91.
7 P90 IN Signal coming from Transparent electrode (touch key on the LCD).
When the 6 key of the transparent electrode is touched, a corresponding signal out of
OUT4 of IC-3 will be input into P90.
8 BYTE IN Connected to VCC1.
9 CNVSS IN Power source voltage: 0V (GND).
The power source vpltage to drive the LSI (IC-1) is input. Connected to GND.
10 P87 OUT Memory (EEPROM) clock out.
11 P86 IN/OUT Memory (EEPROM) data input/output.
12 RESET IN Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily set
to “L” level the moment power is applied, at this time the LSI is reset. Thereafter set at “H”
level.
13 XOUT OUT Internal clock oscillation frequency control output.
Output to control oscillation input of Xin.
14 VSS IN Power source voltage: 0V (GND).
The power source vpltage to drive the LSI (IC-1) is input. Connected to GND.
15 XIN IN Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to Xout terminal.
16 VCC1 IN Power source voltage: +5.0V.
The power source voltage to drive the LSI (IC-1) is input to VCC1 therminal.
17 NMI IN Connected to VCC1.
18 P84 IN Input signal which communicates the drawer door close information to LSI from
the door sensing switch.
Door opened; “L” level signal(0V).
Door closed; “H” level signal(+5V).
19 P83 IN Input signal which communicates the drawer door open information to LSI from
the door position switch front.
Door opened; “L” level signal(0V).
Door closed; “H” level signal(+5V).
DESCRIPTION OF LSI (IC-1)
The I/O signal of the LSIis detailed in the following table.
Pin No. Signal I/O Description