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PORT
NAME
PORT TYPE
COMMENT
Microprocessor clock input pin
Reset input pin
BCD output pin
SEARCH flashing (approx. 1 sec cycle)
LED OUT
REPEAT output pin
REST output pin
Gap between tunes input pin
Record size and presence detection
PULSE COUNT switching
5V
Block Diagram
Tonearm section
Horizontal
drive
circuit
Horizontal
position
detection
Display
circuit
Vertical
drive
circuit
Vertical
position
Gap between tunes
detection circuit
Record presence and
size detection circuit
Microprocessor
4K ROM
42-pin
Switch accept
KEY MATRIX
@ Display of
tune 1—8
e Repeat display
@ Relay of signal
from tape deck
or preamplifier
@Start/Stop
e@ Repeat
@ Move to the
right
®@ Move to the
left
© UP/Down
eSkip
© Clear
® Designation of
tunes 1 —8
@ INDEX
Fig. 3
AL-B77EK
4.17 MHz
L «+ RESET
(during
search)
EEA x
L « REPEAT - ON
L « REST
H + Gap between tunes
H <
17cm (30 cm outer edge)
H + None (on the platter mat)
L«-0O
H+
-—3
(ics. 2896)
1-5
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