Diagram 6 Pin-assignment of the REMOTE CONTROL D-Sub connector
6. METERING
The green LED indicator (1) permits the continuous monitoring of the output level, providing the possibility
to prevent the speaker systems from overload situations and damaging. When during program peaks the
red CLIP LED (2) lights briefly, the maximum distortion-free output is gained. Whenever the CLIP LED
(2) is continuously lit, the amplifier is driven into overdrive and the input level should be reduced.
7. 24 V DC OPERATION
The DPA 4410 can be operated on the mains power supply or fed by an external 24 V battery.
Switching to battery operation is performed through an internal relay.
The battery is connected to the socket on the rear of the appliance (20), using insulated AMP flat
connectors 6.3 x 0.8 mm. The amplifier is protected against the confusion of poles. Additional internal
protection is provided by two 25 A miniature fuses, located on the printed board assembly 85264 (see
also diagram 10).
The battery cable’s cross section should be at least 2.5 mm
2
and the length of the cable should not exceed
4.0 m (max. drop in voltage <1 V).
Attention. The DPA 4410 can only be operated using batteries without grounding or batteries with
grounding of the negative pole. Operation with batteries with grounding of the positive
pole is not possible.
8. SETTING THE OUTPUT VOLTAGE (only by qualified service personal)
The DPA 4410 provides output voltages of either 20 V, 50 V, 70 V, or 100 V. The output voltage is preset
to 100 V. Changing the output voltage to a value of 20 V, 50 V, or 70 V should only be carried out by
authorized DYNACORD service personal.
Attention During the operation the pins of the POWER OUTPUT strip may conduct dangerous
voltage (> 34 V in peaks). Therefore, the connected speaker networks have to be
installed in accordance to applicable security regulations (see also paragraph 9.2).
- To open the appliance remove the top plate.
- The four output transformers 354030 are located on the left-hand side of the appliance. They are
numbered 1, 2, 3, and 4; starting from the rear cover plate of the appliance.
- Before switching an output, the corresponding transformer has to be removed. This is done by detaching
the screws on the bottom plate of the appliance.
- For changing the output voltage (see also diagram 7), the orange wire on the transformer attached to
the soldering tab 13 (100 V) has to be unsoldered and soldered instead to the required soldering tab
(70 V, 50 V, or 20 V).
- The output transformer as well as the screws on the bottom plate have to be replaced at the same spot.
- The top cover plate of the appliance has to be replaced.
1 +24V = Standby 11 ⊥ monitor ground
2 ⊥ Standby ground 12 monitor 2
3 power remote 13 ⊥ monitor ground
4 battery remote 14 monitor 4
5 ⊥ monitor ground 7
6 monitor 3 8 ready
9 ⊥ monitor ground 15
10 monitor 1
25
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