Kenwood RXD-M33V Service Manual page 10

RXD-M33V
8. Port Logic
• Cassette Deck Reel Pulse (X29, IC301)
Input Voltage (V)
(Pin 97)
0.00~1.93
1.95~2.91
2.92~4.80
• Thermal Sensor (X29, IC301)
Input Voltage (V)
(Pin 97)
0.00~2.49
2.51~4.80
2Timing Chart
M + : Motor control for CD tray open direction
M - : Motor control for CD tray close direction
OPEN SW : Tray open detection switch
CLOSE SW : Tray close detection switch
• Cassette Mechanism Control
✽
A/B
✽
A/B-1
✽
A/B-2
X29, IC301
Deck Mode
STOP
PLAY
FF
RWD
REC
ARM
REC PAUSE
• PB/REC AMP (X28, IC1)
A/B (Pin 21)
Bø/¿ (Pin 22)
10
CIRCUIT DESCRIPTION
• Voltage Protection (X29, IC301)
Port Logic
Logic
LOW
-
HIGH
• CD Tray Mechanism Control
1 Port Logic
Loading Motor
Protection
ON
OFF
Low Mid High
L H H
L L H
R/P(Pin78) BIAS(Pin77)
L L
L L
L L
L L
H H
H H
H L
PLAY REC
NOR CrO2 NOR CrO2 NOR CrO2
L L H H
L H L H
Protection
(Pin 92)
LOW OFF
HIGH ON
OPEN
M + HIGH
M - LOW
HIGH : Motor ON
HIGH : Motor ON
LOW : Switch ON
LOW : Switch ON
✽
A/B : Pin 21(X28, IC1)
✽
A/B-1 : Pin 52 (X29, IC301)
✽
A/B-2 : Pin 53 (X29, IC301)
A/B-1(Pin52) A/B-2(Pin53)
L L
L L
L L
L L
H H
H L
H L
ARM
M M
L H
• CD Protection (X29, IC301)
Input Voltage (V)
(Pin 91)
0.00~1.50
1.51~3.49
3.50~4.80
CLOSE BRAKE
LOW HIGH
HIGH HIGH
Protection
ON
OFF
ON