Specifications

6/18/2009 8
3.4 Time code synchronization (jam)
The internal clock is driven by a highly accurate clock oscillator.
It is possible to synchronize the clock with an external LTC time code signal.
Note that only hh:mm:ss:ff will be synchronized, yy:mm:dd (year/month/date) will not be
affected.
Perform the following steps for correct time code synchronization:
1. Follow the steps outlined in 3.3 to enable time code mode and also set the clock to correct
date.
2. Use the specially made cable (optional) with a mini-USB plug and a XLR-3F socket.
3. Power on the mixer and connect the cable to the mixer’s USB socket and to a suitable LTC
signal source. Note that only XLR pin 2 is used, with pin 1 = GND.
4. Press and hold the STOP key
5. The bar graph will flash once per second while jamming.
6. Release the STOP key after a few flashes and disconnect the cable.
The internal clock is now synchronized to the external LTC time code.
Whenever a new recording starts the time code data will be written in the BWF file header.
Note that a new recording will always start on the increment of seconds; hence the frame
number written is 00.
3.5 Power Supply
MM-4220 runs from an internal NiMH power pack. This is a high capacity pack with re-
chargeable accumulators for a full working day without need for additional charging.
The included mains adapter/charger unit can be used for both charging and powering the mixer.
The power supply has a 2.1 mm plug, polarity is any. For both powering and charging the
minimum current capacity must be 1 A @ 18 V DC.
When connected the LED next to the socket will be lit red. When the mixer is fully charged the
LED will be lit green. This may take up to 2.5 hours for a fully discharged unit.
There is no need to discharge the unit before charging.
The internal, intelligent charging circuitry handles the complete charging cycle.