Key: Matrix; 2S 5 Ieee Se Rs Coe Eels; Key Matrix Configuration - Kenwood KRC-646D Service Manual

CIRCUIT DESCRIPTION
KEY MATRIX CONFIGURATION
Key Matrix Layout
Ke (24)
2
} Louoness
_ zz ee
La
Me
Sa Ss
The number in the bracket shows the pin no.
SY
|| : Momentary switch om : Diode matrix (closed/opened by diode)
SS
Zw
GY Alternate switch or transistor switch [| : Open
LZ
Key Matrix Connection Switch Connection
Momentary switch Alternate switch
uPD1708G-637-00 KS,
K
ks, [27]
z KSJK, KS /K, Ky K, KS, KS,
KSm — KSm— [9] [20] [21] 2a] b [25] [26]
ih
Transistor switch
Voo Kn
KSm tL KSm
Diode matrix or open
Momentary switch
Alternate switch or
transistor switch
fr TO
Diode matrix
14