Sharp MZ-80B - 1.2 Expansion equipments

A3
A2
Al
AO
Peripheral
86
interface
85
18255)
B4
C7
C6
C5
C4
1-- -,
b STOP
I
b
I
p
p
I
PNL
BLKl
8LK2
P RDATA
P TREADY
b WREADY
I
I
P WDATA
P WRITE
bREW
I
o OPEN
I
L _____ J
Block Diagram around the Cassette
Condition
~ .
--T:-Ch~Ck Point
,I,:
Load is not possible.
Is there a signal from pin 6 of le 26?
YES.
Check IC23.
NO. Check IC26.
Save is not possible. Is there a signal from pin 10 of IC23?
YES. Check IC26.
NO: Check IC23.
Motor does not turn. Check IC23.
MOtor
does nOt stop.
Check IC23.
- 11 -
For cassette