Operating instructions

34
Maintenance
Calibration
The 4-710d is internally calibrated at the factory. Calibration should never be required and no user
adjustments are available.
Fuse
There is no user accessible fuse for the 4-710d. It contains an internal power supply circuit board with
its own fuse.
Voltage Select
The 4-710d contains a universal auto-sensing, filtered, multi-stage regulated power supply which
supports 100-240VAC and 50-60Hz power for trouble-free operation worldwide. No switch setting is
required when changing from 115 to 230 volt use or vice versa.
Service
If your 4-710d should ever require service, please see “Service & Support” on page 43.
AES/EBU DB-25 Connector Pinouts
The table below details the signals present on the DB-25 connector pins for the AES-EBU outputs.
CHANNEL DESIGNATION
HOT (+)
COLD (–)
GROUND (shield)
Channels 1–2 Receive*
24
12
25
Channels 3–4 Receive*
10
23
11
Channels 5–6 Receive*
21
9
22
Channels 7–8 Receive*
7
20
8
Channels 1–2 Transmit
18
6
19
Channels 3–4 Transmit
4
17
5
Channels 5–6 Transmit
15
3
16
Channels 7–8 Transmit
1
14
2
* Since the 4-710d does not perform D/A conversion, the receive pins for channels 1–8 are inactive.
 The 4-710d contains no user-serviceable parts. Repair should be performed only by
qualified service personnel. Contact Universal Audio for service information.