Monroe Electronics 631A User Manual

Model 631A Program Timer Jr. Instruction Sheet

Specifications

Video

>70 dBmV @ 100 MHz.
>45 dBmV @ 450 MHz

Stereo Audio

DPDT w/screw terminals

Clock Accuracy

±1 sec per day @ 20°C

Battery Backup

1.5 VDC AA

Power Requirement

100-240 VAC ±2%, 50/60 Hz.
Power pack output; +12 VDC

Physical

2.00"H x 4.25"W x 6.50"D

Description

Monroe Electronics' Model 631A
Program Timer Jr. provides 2x1 (AB)
balanced stereo audio follow video
switching by timed commands. Six ‘ON’
and six ‘OFF’ instructions may be stored
in the timer’s memory. NO & NC
contact actions are also provided with
each timed switch .
The test button, under the ‘h+’ and ‘m +’
Buttons, is used to manually change the
status of the 2x1 switch.

Installation

1. Remove the four screws on the
cover of the 631A and install a AA

battery in the holder on the under

side of the PC board. Re-install the
cover screws.

2. Connect your main stereo
audio/video source to the primary
inputs.

3. Connect your alternate stereo
audio/video source to the secondary
inputs.

4. Connect the 631A’s stereo
audio/video outputs to your
equipment’s inputs.

5. Connect the furnished power
supply’s WH wire to the +12 VDC on
the 631A, and the BK wire to GND.

6. Apply AC power, the display will
show ‘OFF’ and ‘00:00’.

Setting Clock

When power has been applied to the
631A, the display will come on showing
‘OFF’ and ‘00:00’.

To set the day of the week, hold down
the clock symbol ‘!!!!‘ button, and push
the ‘Day’ button until the proper day of
the week is set.

Then, while still holding down the clock
symbol button, push the ‘h+’ button until
the proper hour is set, and then push
the ‘m+’ button until the proper minut e
shows. Two models of timers may be
used. If the colon between the hour and
minutes stops blinking when the timer
button is pushed, the timer starts when
this button is released. If t he colon
continues to blink, then the timer starts
at 0 seconds when the ‘m+’ switch is
pushed.

Programming

There are 6 ‘ON’ and 6 ‘OFF’
programmable instructions for the 2x1
switch. Each press of the ‘Timer’ but t on
steps
through them, fr om 1 ‘ON’ to 6 ‘OFF’.

Note:
If an ‘ON’ or ‘OFF’ instruction both
occur at exactly the same time and day,
the ‘OFF’ instruction will be executed
and the ‘ON’ instruction will be ignored.

Deleting Programs

An instruction is erased by incrementing
the ‘h+’, ‘m+’, and ‘Day’ buttons to
restore the horizontal (null) lines.

Note:
Momentarily pressing the ‘Reset’ detent
will eliminate all program data from the
unit as well as eliminating the time
setting. The ‘Reset’ detent has the
same effect as removing all power
(including the battery) fr om the unit.

Operation

The 631A’s primary inputs are normally
connected to the common outputs. It
remains in this state until an ‘ON’
instruction is received from the tim er .
This will connect the secondary inputs to
the common until an ‘OFF’ instruction
from the timer is received.

To make one of the program
instructions active, enter the hour and
minutes desired with the ‘h+’ and ‘m+’
buttons.

Then press the ‘Day’ button. This
selects which of the individual days or
day groups you wish: Monday through
Friday, Saturday/Sun-day, or Monday
through Saturday. If you wish the
programmed in-struction t o be done
every day, do not enter a day selection.

When all instructions have been
entered, press the clock symbol which
will again display the time and day of
week.

Maintenance

The internal battery pro-vides a
minimum of eight hours of memory back
up. Replace the battery at least once a
year, or more often depending on
usage.

P/N 1340184

071906