Read Sony XR-4950X / XR-4954X Service Manual online
30
EEPROM communication terminal
EEPROM data input/output terminal
EEPROM communication terminal
EEPROM clock output terminal
76
NCO
O
Not used
AM filter control terminal
Outputs “L”during 2.94 to 5.585, 14.125 to 18.135 MHz during SW reception, and
outputs “H” at other times
Front panel open/close detection input
Panel is closed when “L”
DOOR indicator output terminal
“H” is output when DOORSW is “H”
“L” is output when NOSESW is “H”
80
REIN1
I
81
REIN0
I
AD conversion power supply control output
When the KEYACK terminal for controlling the AVREF power supply to input key AD
conversion inputs is active, “L” is output from this terminal to set the input possible state
Illumination power supply control output
Output control terminal of the power supply for illumination of functions keys, etc.
Depends on pressing the OFF key for two seconds to turn it off
OFF key normally off, etc
Accessory power supply detection output input (ACCIN)
Pressing the OFF key for two seconds to turn it off, etc
System power supply control output (PW ON)
When on output= “H” output
When off output= “L” output
Reel table rotation detection input
Used for detecting tape end using the terminal for detecting tape rotation
85
POS3
I
86
POS2
I
Position signal detection input
87
POS0
I
Terminal for detecting tape position Connected to MD
88
POS1
I
Loading motor control output (Loading direction)
Rotates the loading motor in the normal direction using the tape control terminal
Loading motor control output (Ejection direction)
Rotates the loading motor in the reverse direction using the tape control terminal
Becomes active together with LM and LOD, and brakes the loading motor
TAPE power supply control output
Capstan motor control output
Loading motor control output (Loading direction)
Loading motor control output (Ejection direction)
Outputs on when one of the above three ports is active
At other times, does not depend on off output and power output
TAPE capstan motor control signal output terminal
Normally, linked with TAPON Outputs LOW when paused at TAPE BEHIND to stop the
motor
91
TAPON
O
Pin No.
Pin Name
I/O
Function
83
ILLON
O
84
REL
I
89
LMLOD
O
78
DOORSW
I
79
DOORIND
O
82
AD_ON
O
75
E2P_CKO
O
77
SWSHIFT
O
90
LMEJ
O
92
CM ON
O
74
E2P_SIO
I/O
Rotary encoder input terminal
active ...... on output
Inactive ...... off output
active ...... on output
Inactive ...... off output
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