Casio JD-8000 Service Manual page 17

Pin No. Signal
75 ~ 77 PORT4~6
78 ~ 80 PORT1~3
81, 82
83, 84 PI, PO
85 DUMMY
86, 87 XI, XO
88 DUMMY
89 ~ 184 S1 ~ S96
185 ~ 216 C1 ~ C32
217 VSSR
218 ~ 222 V0 ~ V4
223, 224 VSS
225 DUMMY
226 VCC
227 VREG2
228, 229 TS1, 2
230, 231 BZ1, 2
232 SW1
233, 234 VD1, 2
235, 236 VD3, 4
In/Out
In/Out For data communication
– Interrupt port
– Not used
In/Out Main clock terminal (3.45 MG)
– Not used
In/Out Clock terminal (DT-26S)
– Not used
Out Segment signal for display
Out Common signal for display
In GND / 0[V]
Out The voltage for LCD drive
OFF : 0[V]
ON; V0 : 3.6 (Min) ~ 5.8 (Max) [V]
V1 : 2.9 (Min) ~ 4.6 (Max) [V]
V2 : 2.1 (Min) ~ 3.5 (Max) [V]
V3 : 1.4 (Min) ~ 2.4 (Max) [V]
V4 : 0.7 (Min) ~ 1.2 (Max) [V]
In GND / 0[V]
– Not used
In Power supply / 3[V]
Out 2 [V]
– Test for manufacturer
Out Buzzer terminal
In 2.6[V]
While pushing the reset button: 0[V]
– VD1: 4.7[V]
– VD3: 4.7[V]
— 15 —
Function
VD2: 1.6[V]
VD4: 1.6[V]