SW1-1: Speed Version Selection (BIII-2)
ON = 3.75/7.5 ips, Low Speed Version (Option)
OFF = 15/7.5 ips, High Speed Version
The BIII-2 is set to High Speed at the factory. After receiving the BIII-2, it can be changed to Low Speed
with this switch. Refer to §2.8 for details. The MKIV-2 cannot be changed to Low Speed.
SW1-2: Punch-In (Refer to §3.2, [18] RECORD button)
ON = Press RECORD and PLAY in Play mode to begin Punch-In
OFF = Press RECORD in Play mode to begin Punch-In
SW1-3: Punch-Out (Refer to §3.2, [19] PLAY button)
ON = Press PLAY to end the Punch-In Record
OFF = Press STOP and RECORD to end the Punch-In Record
SW1-4 & SW1-5: Capstan PLL Reference Setting. When the machine is in FIX mode, the capstan
speed is adjusted with these switches (refer to §6.7).
SW1-4 SW1-5 OFFSET (%)
ON ON +0.2%
OFF ON -0.2%
ON OFF -0.4%
OFF OFF Not used
SW1-6: Adding Punch In Type Selection
ON = Edge Type. With this setting, the Punch In command signal is as shown above. Additional Punch-
Ins are made by pressing PLAY and RECORD (or just RECORD) while in Ready mode.
OFF = Level Type. With this setting, the Punch In command signal is as shown above. Additional Punch-
Ins are made by changing READY/SAFE switches from the SAFE position to the READY position.
SW1-7: Flashing RECORD button selection. This switch selects whether the lamp on the RECORD
button flashes when the READY/SAFE switch is set to READY.
ON = Illuminates (does not flash). OFF = Flashes
SW1-8: External control selection. Used allow the EXT CTRL switch to enable/disable transport control
from CB-144 (remote controller for MX-5050MKIV-8).
ON = Transport control functions can be enabled/disabled by the EXT CTRL switch.
OFF = The EXT CTRL switch is disabled (MX-5050 tape transport can always be controlled from
CB-144).
SW2-1 & SW2-2: These switches select the function of the SEARCH 3 key.
SW2-1 SW2-2 Function
ON ON Proximity Sensor ON/OFF key*
OFF ON Not used
ON OFF Search Start (§4.5.6)
OFF OFF Search Cue (§4.5.3) Default Setting
* When using the optional proximity sensor, pressing SEARCH 3 enables/disables the Proximity Sensor
Function.
SW2-3: This switch selects whether the audio signal is muted during the time from when the STOP
button is pressed until the machine actually stops.
ON = Not Muted. OFF = Muted.
SW2-4: This switch selects whether the audio signal is muted during Fast Wind modes other than Fast
Wind Cue mode.
ON = Not Muted. OFF = Muted
SW2-5: This switch selects whether the audio is muted during the time from when the PLAY button is
pressed until the tape enters Play mode.
ON = Not Muted. OFF = Muted
SW2-6 & SW2-7: These switch settings determine the machine type. These switches are set at the
factory and should not be changed.
SW2-6 SW2-7 Type Tape Rehearsal Size
ON ON- 8CH 1/2" O O
OFF ON 4CH 1/2" O O
ON OFF 4CH 1/4" O O
SW2-8: Not used
MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual
1999-02 7
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