Kenwood KRC-709 Service Manual page 5

MICROCOMPUTER'S TERMINAL DESCRIPTION
UPD703033GC050 (IC1: X14)
SYSTEM MICROCOMPUTER
Pin Name
36 X1
37 Vss
38 Vdd
39 CLKOUT
40 N.C
41 MOTOR
42 MODE3
43 MODE1
44 MODE2
45 N.C
46 SUB1
47 SUB2
48 SUB3
49 CAS/SRM
50 N.C
51 N.C
52 ILL-ON
53 PAN-5V
54 N.C
55 BVdd
56 BVss
57 TYPE1
58 TYPE0
59 N.C
60 N.C
61 ST TYPE1
62 ST TYPE0
63 SRM-SW1
64 PAN-RESET
65 L CE
66 SRM-SW3
67 SRM-SW2
68 FWD/REV
69 MS-CONT
70 AVCONT
71 Avdd
72 Avss
73 Avref
74 PHONE
75 R-REEL
I/O Purpose
I Main clock connection terminal.
- Grounding terminal.
- Positive power supply terminal.
O Internal System Clock output.
O No connection.
Cassette mechanism main motor
O
output terminal.
I Cassette mechanism mode detection terminal.
I Cassette mechanism mode detection terminal.
I Cassette mechanism mode detection terminal.
O Outputs Low. No connection.
O Sub-motor output terminal (1).
O Sub-motor output terminal (2).
O Sub-motor output terminal (3).
Cassette mechanism/SRM mechanism
O
voltage switching terminal.
O Outputs Low. No connection.
O Outputs Low. No connection.
O FL +B output terminal.
O Panel 5 V control terminal.
O Outputs Low. No connection.
- Positive power supply terminal.
- Grounding terminal.
I Destination type switching port.
I Destination type switching port.
O Outputs Low. No connection.
O Outputs Low. No connection.
I IC2 destination type terminal.
I IC2 destination type terminal.
I Panel position detection switch 1.
O Reset output to Panel u-COM.
I/O CE terminal for LCD driver.
I Panel position detection switch 3.
I Panel position detection switch 2.
O TAPE EQ input switching terminal.
Constant switching terminal in case
I/O
of blank detection.
O AD reference voltage control output.
- Positive power supply terminal.
- Grounding terminal.
Reference voltage supply terminal for
I
A/D converter.
I PHONE detection terminal.
I Cassette mechanism reel pulse input (REV).
KRC-709,779R/RY,889
When the motor is running: H.
When it is stopped: L.
Cassette mechanism: H.
SRM mechanism: L.
ON: H, OFF: L
Default: L.
Default: L.
Normal: H. Reset: L. Panel detached: L.
Momentary power down: L.
Microcomputer overrun: L.
FWD: L. REW: H.
During TAPE PLAY: H.
During TAPE FF/REW or other than
TAPE input: L.
Cassette mechanism detected: L.
Cassette mechanism not detected: H.
Same timing as P-ON. H during
operation.
TEL MUTE: No more than 1 V.
NAVI MUTE:2.5 V or more.
Vth = 2.5 V.
Operation Description
5