FOR-A UFH-70ADA User manual

UFH-70ADA
Audio Distribution Amplifier
1st Edition
OPERATION
MANUAL

Precautions[MA1]
Important Safety Warnings
[Power]
Do not place or drop heavy or sharp-edged objects on power cord. A damaged cord
can cause fire or electrical shock hazards. Regularly check power cord for
excessive wear or damage to avoid possible fire / electrical hazards.
[Circuitry Access]
Do not touch any parts / circuitry with a high heat factor.
Capacitors can retain enough electric charge to cause mild to serious shock, even
after power is disconnected. Capacitors associated with the power supply are
especially hazardous. Avoid contact with any capacitors.
Unit should not be operated or stored with cover, panels, and / or casing removed.
Operating unit with circuitry exposed could result in electric shock / fire hazards or
unit malfunction.
[Potential Hazards]
If abnormal smells or noises are noticed coming from the unit, turn power off
immediately and disconnect power cord to avoid potentially hazardous conditions. If
problems similar to above occur, contact authorized service representative before
attempting to again operate unit.
[Consumables]
The consumables used in unit must be replaced periodically. For further details on
which parts are consumables and when they should be replaced, refer to the
specifications at the end of the Operation Manual. Since the service life of the
consumables varies greatly depending on the environment in which they are used,
they should be replaced at an early date. For details on replacing the consumables,
contact your dealer.
Caution
Stop
Hazard
Stop
Caution

Upon Receipt
Unpacking
UFH-70ADA units and their accessories are fully inspected and adjusted prior to shipment.
Operation can be performed immediately upon completing all required connections and
operational settings.
Check your received items against the packing lists below.
ITEM QTY REMARKS
UFH-70ADA 1 1 front module
1 rear module
Operation Manual 1
Check
Check to ensure no damage has occurred during shipment. If damage has occurred, or items
are missing, inform your supplier immediately.

Table of Contents
1. Prior to Starting...........................................................................................................................1
1-1. Welcome.............................................................................................................................1
1-2. About the UFH-70ADA........................................................................................................1
1-3. About This Manual..............................................................................................................1
2. Panel Descriptions......................................................................................................................2
2-1. Front Panel.........................................................................................................................2
2-2. Rear Panel..........................................................................................................................2
3. Connection..................................................................................................................................3
3-1. Connecting Wiring to Terminal Block ..................................................................................3
3-1-1. Balanced Input/Output................................................................................................3
3-1-2. Unbalanced Input/Output............................................................................................3
3-2. Connection Example...........................................................................................................4
4. Internal Block Diagram................................................................................................................6
5. Internal Settings..........................................................................................................................7
5-1. Operation Mode (SW4).......................................................................................................7
5-2. Input Termination Impedance (SW1, SW2).........................................................................8
5-3. GAIN Setting (SW3, SW5) .................................................................................................9
6. Specifications and Dimensions .................................................................................................10
6-1. Specifications....................................................................................................................10
6-2. Dimensions.......................................................................................................................11

1
1. Prior to Starting
1-1. Welcome
Congratulations! By purchasing UFH-70ADA AUDIO DISTRIBUTION AMPLIFIER you have
entered the world of FOR-A and its many innovative products. Thank you for your patronage and
we hope you will turn to FOR-A products again and again to satisfy your video and audio needs.
FOR-A provides a wide range of products, from basic support units to complex system
controllers, which have been increasingly joined by products for computer video based systems.
Whatever your needs, talk to your FOR-A representative. We will do our best to be of continuing
service to you.
1-2. About the UFH-70ADA
Features
 Mountable to FOR-A UFH system frames
 Gain control available on the front panel
 Presettable output level control.
 Single channel mode (one-input / seven-output) and Dual channel mode (two systems of
one-input / three-output) selectable
1-3. About This Manual
This manual is intended to help the user easily operate the UFH-70ADA and make full use of its
functions during operations. Before connecting or operating your unit, read this operation
manual thoroughly to ensure you understand the product. After reading, it is important to keep
this manual in a safe place and available for reference.

2
2. Panel Descriptions
2-1. Front Panel
(1) Power indicator The power indicator is lit whenever the supply curcuit on the
board is operating properly.
(2) GAIN A Used to control audio gain in the range from -6dB to +6dB.
(3) GAIN B (*1) Used to control audio gain in the range from -6dB to +6dB.
(4) INTERFACE Not used.
(*1) Available in dual channel mode (two systems of one-input / three-output).
2-2. Rear Panel
 If Single Channel mode:
AUDIO IN Used to input audio signals.
(1) OUT1
OUT2
OUT3 Used to output audio signals.
(2)
OUT4
OUT5
OUT6
OUT7 Used to output audio signals.
 If Dual Channel mode:
IN A Used to input audio signals for system A.
(1) OUT A1
OUT A2
OUT A3 Used to output audio signals for system A.
IN B Used to input audio signals for system B.
(2) OUT B1
OUT B2
OUT B3 Used to output audio signals for system B.
UFH-70ADA
INTERFACE
(OPTION)
GAIN A GAIN B-15V+15V
UFH-70ADA
+3.3V
(1) (2) (3) (4)
OUT A1IN A IN B OUT B1OUT A2 OUT A3 OUT B2 OUT B3
+- -++- -++--++- -+
ANALOG AUDIO IN OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7
UFH-70ADA
GGGG GGGG
(1) (2)

3
3. Connection
Refer to figure below for connecting the UFH-70ADA to other devices.
Note that before installing the UFH-70ADA into a system frame, you should thoroughly read the
operation manual for the System Frame where you will be installing.
3-1. Connecting Wiring to Terminal Block
To connect audio wiring to the terminal block on the UFH-70ADA rear module, follow the steps
below.
1) Unscrew the cover screws at both sides of the terminal block using a small Phillips-head
screw driver.
2) Remove the terminal block cover forward. Set it aside.
3) Release the port screw on the top of the terminal block by using the same screw driver.
4) Insert the wire end into the port and secure the cable to the port with the port screw.
IMPORTANT
Use AWG16 to 28 wire. Strip the wire shielding so that approximately 5mm of each
wire is exposed.
3-1-1. Balanced Input/Output
For balanced input and output, connect the hot, cold, and shield of the audio signal to their
respective terminals (+, - and G for each).
3-1-2. Unbalanced Input/Output
For unbalanced input and output, connect the analog audio signal line to hot and shield
(ground) line to both cold and shield. After the connection has been made, check the level
and adjust it as required by using the GAIN dial.
(1) (1)
+-
GG
-
++- G- +G
(2) Top of the terminal block

4
3-2. Connection Example
(1) Single channel mode (one input to seven outputs)
(2) Dual channel mode (Two systems of one input to three outputs)
Audio Signal
AUDIO IN OUT 1
OUT 2
OUT 3
OUT 4
UFH-70ADA
System frame
OUT 5
OUT 6
OUT 7
Audio
Signal
Audio signal
（System A）IN A OUT A1
OUT A2
OUT A3
UFH-70ADA
System frame
OUT B1
OUT B2
OUT B3
Audio signal
（System A）
IN B Audio signal
（System B）
Audio signal
（System B）