Read Sony XR-4900 Service Manual online
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Pin No.
Pin Name
I/O
Function
50
NCO
O
Not used
51
AMSON
O
“L” is output in AMS mode
52
N/R-OUT
O
FOR/REV control output
53
MTLON
I/O
Metal control input/output
54
TAPMUT
O
Tape mute control output
55
DOLON
I/O
Dolby control input/output
56
AMSIN
I
Input to detect existence of song during AMS mode
57 to 75
NCO
O
Not used
76
ST
I/O
Combination stereo input and monaural output
77
SD-IN
I
SIGNAL DETECTOR input terminal
78
REIN 0
I
79
REIN 1
I
80
AD ON
O
Power supply control output of AD conversion
81
PW SEL
I
Power selection initialise
82
ILLON
O
Illumination power supply control output
83
REL
I
Input to detect rotation of reel table
84
POS3
I
85
POS2
I
86
POS0
I
87
POS1
I
88
LM LOD
O
Loading motor control output (to a direction of loading)
89
LM EJ
O
Loading motor control output (to a direction of ejection)
90
TAPON
O
TAPE power supply control output
When ‘on’ is output, “H” is output, otherwise when ‘off’ is output, “L” is output.
91
CM ON
O
Capstan motor control signal output terminal of TAPE
92
PW ON
O
System power supply control output
93
FM ON
O
FM power supply control output terminal
94
TUNON
O
TUNER power supply control output terminal
95
NCO
O
96 to 99
NCO
O
Not used
100
NCO
O
Tape position signal detection input
Rotary encoder input terminal
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