Rokola Music Jukebox Digital RK4 User manual

Rokola Music
Modernization of jukeboxes J u k e b o x D i g i t a l R K 4
1
Venezuela-Puerto Cabello Cell: [phone] E-mail: oliveira71059.gmail.com
Puerto Cabello, May 2019
T e c h n i c a l a n d U s e r M a n u a l
NSM
Model Minibox GP-4G
Year 1964
(93x76x50) cm
Rowe AMI
Model JBM 200
“Tropicana” Year 1964
(138x86x72) cm
Seeburg
Model 100-78D “Celestia”
Year 1979
(136x80x60) cm
Wurlit
zer
Model 2300S
Year 1952
(129x85x71) cm
Rowe AMI
Model CMM-1
“Cadette” Year 1967
(122x82x59) cm
(Height x Width x Depth) Modernized equipment
F i r s t E d i t i o n
(English Version)
Printed in Venezuela by Rokola Music
File: Jukebox RK4EN.doc
Made by: José Luís Oliveira
Electronic Engineer, IUPFAN 1981
Venezuela
CIV: 31.980
E-mail: oliveira71059.gmail.com
MODERNIZED MODEL: ________________________________ Cell: [phone]
SERIA MODEL: ___________________________________
Copyright Rokola Music 2005-2019
Jukebox Digital RK4
Digital MP3 player system for modernizing Jukeboxes (can include more than 9,000 song files)
Apologies
“My sincere apologies for the spelling and
editorial errors made in this manual, the translation was
done with the help of Google and my limited knowledge
of English. Any comments will be very well received”.

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I N D E X
I.- Introduction .......................................................................................................................... 4
1.1 - Hardware Needs …................................................................................................... 4
1.2 - Software Needs......................................................................................................... 4
1.3 - Operating Modes....................................................................................................... 5
1.4 - Random Play or Reset ............................................................................................. 6
1.5 - Random by Album..................................................................................................... 6
1.6 - Tumble...................................................................................................................... 6
1.7 - Volume Up ................................................................................................................ 6
1.8 - Volume Down............................................................................................................ 6
1.9 - Password .................................................................................................................. 6
1.10 - Other Functions....................................................................................................... 7
1.11 - Programming Mode................................................................................................. 8
1.12 - Setting Codes Table................................................................................................ 9
1.13 - BoomBox Mode..................................................................................................... 11
1.14 - Display Card.......................................................................................................... 12
1.15 - Hardware Description............................................................................................ 13
1.16 - Keyboard Distributor.............................................................................................. 13
1.17 - Numeric Keypad.................................................................................................... 15
1.18 - Command Keypad................................................................................................. 16
1.19 - Remote Control ..................................................................................................... 19
1.20 - Table of Characters Assigned ............................................................................... 20
1.21 - Audio Amplifier ...................................................................................................... 20
1.22 - Speakers............................................................................................................... 20
1.23 - Song Files Description .......................................................................................... 20
1.24 - How to adjust the music files volume?................................................................... 21
1.25 - How to create the Songboard Labels?................................................................... 22
1.26 - Enumeration Labels Adhesive for the SongBoard ................................................. 23
II.- Operating System Installation and RK4 Program ....................................................... 24
2.1 - Install the Operation System ................................................................................... 24
2.2 - Installing RK4 (first time) ......................................................................................... 24
III.- Using the Jukebox Digital RK4 Program ..................................................................... 25
3.1 - Main Window........................................................................................................... 25
3.2 - Setting Window ....................................................................................................... 26
3.2.1 - Direct Commands ....................................................................................... 26
3.2.2 - Album Command ........................................................................................ 26
3.2.3 - BoomBox Command ................................................................................... 26
3.2.4 - Special functions ......................................................................................... 27
3.2.5 - Jukebox Data .............................................................................................. 27

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3.2.6 - Jukebox Path .............................................................................................. 28
3.2.7 - Default Functions ........................................................................................ 28
3.2.8 - Menu Setting Window ................................................................................. 28
3.3 - SongBoard Window................................................................................................. 29
3.4 - Rating Window........................................................................................................ 30
3.5 - Info Jukebox Window .............................................................................................. 30
IV.- Technical Information ................................................................................................... 20
4.1 - Characteristics ........................................................................................................ 31
4.2 - Connection Diagram Jukebox RK4.......................................................................... 32
4.3 - Jukebox Connectors................................................................................................ 33
4.4 - Parts List Display Card............................................................................................ 35
4.5 - Electrical Diagram Display Card.............................................................................. 36
4.6 - Topographic Diagram Display Card......................................................................... 37
4.7 - Connection Diagram Keyboard Distributor .............................................................. 38
4.8 - Component Data Sheet........................................................................................... 39
4.9 - Guarantee and Technical Assistance ...................................................................... 40
4.10 - Jukebox Brief History ............................................................................................ 41
4.11 - MP3 History........................................................................................................... 42
4.12 - System with Pendriver and Compact Flash ...................................................... 42
4.13 - Coin detector or token ........................................................................................... 43
4.14 - Stereo Audio Amplifier TDA7294........................................................................... 44
4.15 - Remote Control Picture ......................................................................................... 44
4.16 - Power Cable 5V-12V (9 pins D-sub female and Molex 0.2 " 4 pins male).............. 45

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Jukebox Digital RK4
I.- Introduction
Project carried out in Visual Basic 6.0 (32 Bits) for Windows 98 SE, Me, 2K or XP, behaves
like a jukebox, to modernize obsolete equipment (vintage jukebox) that does not have spare
parts, but its structure can still be restored. The project is designed to operate any jukebox model,
making it a fully digital modern jukebox using mp3 music files.
The program works under the Windows 2K operating system, which must be installed on a
compact memory card for greater reliability, the music files must be on a pendrive, the RK4
program changes the name of the song files ascending from 101 and organize and classify using
the information of ID3 v1. Windows 2K has proven to be the most efficient operating system for
this project.
The mp3 music files must have in the ID3 v1 the following information: title, artist and album.
With the title and artist the labels of the songboard are elaborated and with the album the types of
music are created.
1.1 - Hardware Needs
1. - Computer desktop, with micro PIII or higher, with 128MB of memory.
2. - Standard keyboard (only the electronic card)
3. - Sound Card. (if the sound is not incorporated)
4. - Compact Flash Card of 4Gb or 8Gb of 30 megabits/sec
5. - Interface Display Model LY-252 (Four Digits).
6. - Jukebox chassis to modernize.
7. - Audio amplifier (original del jukebox or TDA7293)
8. - Protector of electronic equipment.
9. - Keyboard Distributor DT12N12C
10. - Command Keypad TR-242L or the equivalent
11. - Numeric Keypad
12. - Coin Detector Model CH-268T or the equivalent
13. - Power Cable 5V-12V (9 pins D-sub female and Molex 0.2 " 4 pins male)
14. - RS-232 serial cable (male-female D-sub 9-pin)
15. - LPT1 cable (male-male D-sub 25 pins)
16. - Pendrive de 16 Gb. (supports more than 4,000 song files)
17. - CDROM unit (only for the installation of the programs or maintenance)
18.- Monitor, mouser and keyboard (only for the installation of the programs or
maintenance).
The parts necessary to restore a jukebox are low cost and easy to acquire (most are sold
by Ebay) and others are easy to manufacture. In this manual you will find the necessary
information to manufacture or adapt the parts necessary for modernization.

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1.2 - Software Needs
1. - Windows Operating Systems Win 2K or Win XP. (preferably Win 2K)
2. - Sound card driver.
3. - Files in compressed MP3 format of the songs, can be installed more than
9,000 song files.
4. - Installation program for RK4 (trial version) available on the Web. The final version
requires a password. The trial version operates completely with the limitation of sounding
the music files only for 60 seconds.
1.3 - Operating Modes
1 - Jukebox (standard mode)
It works like a Jukebox, for this you must use a pendrive with the archives of songs
classified by album. This mode can operate in two ways:
1.1.- Free Mode (free player)
1.2.- Commercial Mode (need bonus to player)
Free Mode: The selection is made directly (free) with the Numeric Keypad (of the Songboard)
and with the Command Keypad selects the album random. When the selection is made from the
Numeric Keypad this is called “Songboard Selection”.
Commercial Mode: The selection is only made from the numeric keypad if credit is available.
2 - Programming Mode
Function to create or modify the songboard and setting jukebox (one part).
To make the complete setting of the RK4 program a keyboard, an LCD screen and a
mouser are necessary.
3 - BoomBox (mp3 player)
It works as an mp3 file player, for this it is necessary to connect a pendrive with music
files. The music file paths must be different from those assigned as jukebox, otherwise it operates
in jukebox mode.
Music files can be saved in different folders (maximum 500 folders) and with the command
keypad you can forward or back music files or folders.
This mode automatically reads the logical units: D, E and F

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1.4 - Random Play or Reset (Random / Reset)
By means of this function, all the songs present in the pendrive are played at random,
including those that are not shown in the Jukebox SongBoard, when selecting this function again,
the function is canceled.
In case there is a song list of the Songboard to play, the random function is not executed.
1.5 - Random by Album
The type of music selected on the pendrive sounds randomly, if it is selected a second
time, select the second album, it only works if there are no selected songs in the billboard mode
(Songboard selection). Music albums can be combined with each other.
The albums of songs are classified into two groups, ALB1-ALB15 operates with the first
touch of the key, ALBt1-ALBt15 operates with the second touch. The third touch cancels the
function.
1.6 - Tumble
Cancels the song that is playing and moves on to the next one. In case there is no song
sounding it shows the Coin Counter (only in commercial mode). In the Programming Mode, it is
used to exit the function. It must be programmed in the “Setting” window of RK4
1.7 - Volume Up (Volume +)
Turn up the volume of the Jukebox in 100 steps. In Programming Mode the position of the
file is increased. It must be programmed in the configuration window of RK4.
1.8 - Volume Down (Volume -)
Lower the volume of the Jukebox in 100 steps. In Programming Mode, the position of the
file is decremented. It must be programmed in the configuration window of RK4
1.9 - Password
To enter this function it is done from the Programming Mode (Tumble + Volume Up) and
the number "9980" is entered.
The password must be three digits except "000" which is used to cancel the password.
By means of this function a Password is assigned to the Jukebox in such a way that the
Jukebox will sound only once the system is initialized and that Password is entered.

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When entering this function you can Assign Password, Change Password or simply
Cancel Password Entry.
ASSIGN PASSWORD: Once inside the "Password Change" function enter a three-digit number
(except 999), once entered from now on it is necessary to enter this Password each time the
Jukebox is turned on (initialize).
CHANGE PASSWORD: Once inside the function, enter the previous Password and then enter
the new Password.
CANCEL PASSWORD ENTRY: Once in the function, enter the Password and then enter the
number "000", and thus the system will not need Password to work.
NOTE: If the password is activated, it is necessary to enter this password for the jukebox to work, the
display shows a closing bracket (]) scrolling through the display before entering the password, the bracket
changes direction ([) when entering the Password correctly.
1.10 - Other Functions (Jukebox Mode):
TUMBLE + VOLUME DOWN (Rating): Default function. Shows the 20 most played songs
in the Jukebox and makes them sound for only 10 seconds each, showing the position in the
Songboard on the display. With the key assigned TUMBLE, this function is exited. The song
becomes Hit once it has played 100 times in SongBoard mode.
0: Default function. In the event that a selection has been made, it shows the number of
songs to be played, if there is no selection, it shows the song count (number of songs played) and
Operation Hours.
-Show Song Counter: press number zero ("0"). First show 3 digits and then 4 digits, for a total of
seven digits. (only in free mode and playback off).
-Show Operating Hours: Press zero again (“0”). First show 3 digits and then 3 digits, for a total of
six digits. (only in free mode and playback off).
If pressed, it shows songs that are going to be played and then the file name of the song
that is being played. Only works in free mode.
BONUS: If activated (commercial mode), it is necessary to have credits to issue a
selection, the credit can be obtained through the command keypad or with the coin detector.
Coin Counter: With the Bonus at zero and without song selection, pressing Tumble
shows the coin counter (only in commercial mode).
Input by file name ( Code Entry) :By selecting this function, the system directly accepts
the song code (File number or Music file name). This mode is used to select a song that is not in
the Songboard of the Jukebox. If the function is activated, the display shows a "U". Enable code:
9970.

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1.11 - Programming Mode (Jukebox Mode)
Default function, to enter press the TUMBLE key and then press the VOLUME UP key on
the screen will show the number 101. Through this function, the billboard of songs that go to the
Songboard is generated or modified. A maximum of 400 (depending on the size of the
SongBoard) can be included, but you can have a larger repertoire on the pendrive, with this
function select only the ones you want. In addition, you can enter codes for different
configurations. See section: 1.12 - Setting Codes Table.
The template contains the respective files for each position in the Songboard, for example,
in position "101" (equivalent to the first position of the Songboard) the desired song file available
on the pendrive is assigned, for example the file "0240" . The names of the song files go from
101 onwards, when you enter files smaller than 999, you must first enter "0" to complete the four
digits.
When selecting this function in the display, the position is shown first, and after four
seconds and for a second the file of the song corresponding to this position, just enter the new file
and it will automatically increase to the next position.
To advance without modifying, use the VOLUME Up key and to back the VOLUME Down
key.
In case of making an error when entering the new file, just wait around 4 seconds and
return to the original position.
To exit this function, simply press the TUMBLE key. Each time you exit this function, the
new template is recorded on the hard disk (Compact Flash) of the system in the same folder
where the RK4 program is located. If there is no activity the function is canceled after 60 seconds.
Very Important Note:
Each time the RK4 program starts, it generates a file called "Available.txt", which contains all the
files, with its artist and title available on the Pendrive. The file "Labels.txt" is also generated, which
contains the name of the title, artist, the position and the file name of each song of the songboard and with
the Word program the labels of the Jukebox are made, they usually have a dimension of 1 "x 3" (2.5x7.5
cm). To make the labels, the file "Labels.txt" is first converted into a table of four columns (title, artist,
position, file name), then, with copy and paste, it is dragged to a new table with the measurements of
labels (4 columns of 18 pts, lengths: 2 "x1" x ½ "(5 cm, 2.5 cm and 1.25 cm) only title, artist and position
are transferred, see chapter I section 1.25 .- How to create the Songboard Labels. These files are
recorded in a folder called "Setting + Jukebox Name"on the hard disk (compact flash) and on the
pendrive).
Within the Programming Mode (press keys Tumble + Volume Up) you can perform the
following functions just by entering the four-digit number, the function is activated or deactivated,
all these functions are done with the Numeric Keypad and the Command Keypad of the
Jukebox:

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1.12 - Setting Codes Table
CODE Setting
9910 Enable or disable Bonus (free player or commercial mode)
9912 Enable or disable Repeat Song
9915 Enable or disable Master Volume (can vary from 0 to 100 )
9920 Enable or disable Backup
9924 Clear Coin Counter
9925 Enable or disable Random Volume (only in free mode)
9926 Turn up the Minimum Random Volume up to 10
9927 Turn up the Maximun Random Volume up to 20
9930 Enable or disable NumLock
9932 Enable display test
9935 Change the time of the Gift Song from 1 to 10 minutes.
9940 Enable or disable Gift Song
9942 Enable or disable Effect ChangeDisk
9945 Change the amount of credit per coin from 1 to 10
9950 Enable or disable Relay Control (enable works as Hit)
9955 Enable or disable Mute Sounds (warning sounds)
9960 Turn up the volume of warning sounds from 1 to 10
9965 Clear the Rating
9970 Enable or disable Code Entry
9975 Enable sequence test play songs (play all the songs on the songboard)
9980 Enable Password Change (assignment, change or deletion of Password)
998 Update the new files that you want to add and SongList.txt
9990 Close the Jukebox RK4 program
9995 Save from the root directory of the pendrive to the Jukebox directory:
Setting.txt and Songboard.txt
9999 Update the RK4 program from the root pendrive
Enable shows "8888" and disable shows "00" on display.
9910 : Change the Jukebox of Free Mode (free player) to Commercial Mode.
9912: If the function is enabled, you can select the same song from the board several times,
disabled you can only select the same song three times.
9915: Enable the master volume; with the volume keys you can adjust the maximum output
volume of the disk machine. To return to volume wav enter code 9915 again. It is used to obtain
the maximum volume of the jukebox. It is shown in the form of three digits to differentiate it from
the wav volume.
9920: Enable Backup, if the disk machine was turned off with a selection of music files to be
played, once it is turned on again, the selection will be recovered when played. It only works in
Commercial Mode.
9924: Set the coin counter to zero.

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9925: Randomly activate jukebox volume.
9926: Increase the Minimum Random Volume up to 10
9927: Increase the Maximum Random Volume up to 20. It must be greater than the minimum
random volume.
9930.: Enable or disable on the NumLock keyboard
9932: Enable display test. Test the four digits of the display and the Hit and Bono outputs.
9935: Change the time of the gift song from 1 to 10 minutes. Each time the code 9935 is entered,
the time increases until it reaches 10 minutes and then starts again at 1.
9940: Enable or disable Gift Song.
9942: Enable or disable Effect ChangeDisk. The program has three types of effect ChangeDisk,
they are randomly selected.
9945: Change the amount of credit per coin from 1 to 10. Each time this code is entered the value
increases by one unit until it reaches ten, and then begins again in one.
9950: Enable or disable Relay Control (if is enable works as Hit). Enable: The output of the
display card turns on a LED every time a Hit is selected (recording that has already been selected
more than 100 times). Disable: the output of the display card (Hit output) can activate a relay
every time a recording is selected.
9955: Enable or disable Mute Sounds. Enable: Silence the warning sounds of the RK4 program.
9960: Increase the volume of warning sounds from 1 to 10. Each time code 9960 is entered; the
volume increases until it reaches 10 and then starts at 1.
9965: Clear the Rating.
9970: Enable or disable Code Entry. Enable: The display shows “U” scrolling and the selection of
each recording is made by entering the file number in four digits format. If the file number is less
than three digits, add a zero at the beginning.
9975: Enable sequence test play songs (play all songs on the song board sequentially)
9980: Enable Password Change (assignment, change or deletion of Password). See section
1.9 - Password.
9985: Update the new files you want to add. In case of adding new files, it is necessary to update
the system, the new files are renamed and they will be added as part of the music files of the
jukebox, the RK4 program generates a file (Available.txt), where the located information of all
available files. The SongList.txt file is also created, which the RK4 program uses to work with
better performance.

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9990: Close the Jukebox RK4 program. This function is used in case you want to update RK4
connected the jukebox PC with another networked PC.
9995: Save from the root directory of the pendrive to the Jukebox directory: Setting.txt and
Songboard.txt. It is used to update the setting and the songboard template
9999: Update the RK4 program from the root pendrive. This is an easy way to update RK4, save
the new version at the root of the pendrive and apply this setting.
1.13 – BoomBox Mode
It works like an mp3 player, the keys:
Volume Up, Volume Down, they are the same as the Jukebox..
The functions: Back Song, Forward Song, Back Folder, Forward Folder, Volume Mic Up,
Volume Mic Down and Pause, must be configured in the RK4 Setting window.
Default Functions (when press the numbers …)
0: First touch shows number of songs in the folder, second touch shows total songs in the
pendrive.
1: Back Song
2: Forward Song
8: Back Folder
9 : Forward Folder
It works as an mp3 file player, for this it is necessary to connect a pendrive with music
files. The music file paths must be different from those assigned as jukebox, otherwise it operates
in jukebox mode.
Music files can be saved in different folders (maximum 500 folders) and with the command
keypad you can forward or back music files or folders.
This mode automatically reads the logical units: D, E and F

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1.14 - Display Card
The Jukebox has a 4-digit display consisting of the Model LY-252 card, which
communicates with the computer through a parallel cable (25-pin male-male) which connects
directly to the LPT1 port (parallel port of the computer 888), this display shows:
- Number of the song playing.
- Number of the song to be introduced.
- Song counter
- Show the songboard template
Interface card between the computer and the user, it is connected directly to the parallel
port of the computer (LPT1), by means of the W3 cable with connection DB25P-DB25P (male-
male 25 pins). The display card is powered by 5V (computer power can be used).
The card has two indication outputs, bonus and hit, each can turn on a 5mm high
brightness LED.
The Gerber files used to manufacture the PCB are available in the website.
Note: If the code of the song that is played every 4 seconds is shown in the screen
with double bracket "<>", this means that the sound file is not in the Songboard of the
Jukebox, refer to the list of songs available in the pendrive (file "Available.txt").
-Stand by (free mode): Show a "c" scrolling on the display
-Stand by (commercial): Show a "c" scrolling on the display and number of plays per coin.

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1.15 - Hardware Description
1.6.1.- Computer
Constituted by the following parts:
- Motherboard with 128MB RAM (minimum).
- CPU PIII or higher.
- Flash Card of 4Gb or 8GB of 30 megabits/sec.
- Chassis with power supply
- Sound Card (with drivers).
- Video card (standard mode)
1.16 - Keyboard Distributor (Model: DT12N12C)
Mainly consisting of a standard computer keyboard, only the electronic card is used, the
keys are adapted according to the keyboard of the Jukebox to be modernized and are configured
with the RK4 program.
From the Keyboard Distributor you get the Numeric Keypad, Command Keypad, and
Remote Control. The keys of the Command Keypad and the Remote Control are connected in
parallel. See section: 4.7 Connection Diagram Keyboard Distributor.
Material and tools needed for construction
Material:
- 5 meters Stranded Hook-Up Cable AWG26 (better several colors)
- 3 connector DB9M for chassis with D-Sub hardware
- Box Aluminum 5x3x2 (or plastic)
- PCB Keyboard standard (included cable and ps2 connector)
- Spacer Hex plastic 4-40x1/2
- Tie Cord Strap 2.5x100mm
- Plastic cable gland
- 5 Screws and nuts 4-40x3/8
Tools:
- Rotary Tools Mini Drill
- Drill bit 1mm or 1.2mm
- Drill driver and bit 1/8
- Square metal file to finish D-Sub holes

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Drilling templates supplied in the website.

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1.17 - Numeric Keypad:
Default keys, by means of these keys, the desired song is selected by means of three
digits, when entering the third digit it is automatically accepted. In case of error if you have the
"CLEAR DISPLAY" (CL) key, used to delete, if not used the program will erase the display data
automatically after 4 seconds.
The numeric keypad is formed by 11 keys, the numbers from 0 to 9, where the user enters
the code of the selected song, which consists of three digits, beginning with the number 101 and
an additional key (optional) to clean the screen. The keyboard of the original jukebox must be
adapted to a 3x4 matrix as shown in the figure.

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1.18 - Command Keypad
Consisting of 12 keys and connected to the Jukebox by means of a serious cable (male-
female) of 9 pins.
Each Command key can be programmed for a specific function through the program RK4
in the configuration of the same and the functions are the following:
Command Keypad Model TR-242L
RANDOM
RESET ALB4
ALB1 ALB5
ALB2
BONUS ALB6
ALB3
TUMBLE ALB7
VOLUME
PROGRAMMING MODE: TUMBLE + VOLUME UP
ALBUM IN PARENTHESES 2DO TOUCH
EXTERNAL FUNCTIONS ONLY IN BOOMBOX
Command K ypad Model TR-242L
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(ALBt4)
(ALBt2)
(ALBt3)
(ALBt1) (ALBt5)
(ALBt6)
(ALBt7)
+
+MIC
-
-MIC
1
2
3
4
5 9
610
117
812
FUNCTIONS
1.- Volume Up (wav)
2:- Volume Down (wav)
3.- Back song or Bonus (in commercial mode)
4.- Forward song (Tumble)
5.- Play Random or Reset and Back folder in BoomBox mode
6.- Play ALB1 or ALBt1 and Forward folder in BoomBox mode
7.- Play ALB2 or ALBt2
8.- Play ALB3 or ALBt3. Pause in BoomBox mode.
9.- Play ALB4 or ALBt4. Volume Mic Up in BoomBox.
10.- Play ALB5 or ALBt5. Volume Mic Down in BoomBox.
11.- Play ALB6 or ALBt6.
12.- Play ALB7 or ALBt7.
NOTE: To play albums in parentheses
press a second time.
The keys for BoomBox and Albums can be configured
The Command Keypad measures 4”x3”x1” and is connected to the jukebox by means of a 9-pin
serial cable (male-female), a maximum length of 20 meters can be used.

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Material and tools needed for construction
Material:
- PCB PC-242 or equivalent
- 4 Hex female standoffs 4-40x5/8
- 4 nut 6-32 (used as a spacer)
- 2 PVC sheets (3.5x3x1/16) a smooth other perforated
- 4 screws 4-40x1/2
- 4 screws 4-40x3/8
- 2 Aluminum angle 1x1/2x1/16 long 3 ¾”
- 2 Aluminum angle 1x1/2x1/16 long 3”
- 2 sheets of 28 lb paper printed and lined with clear contact paper
- 1 meter Stranded Hook-Up Cable AWG26 (better several colors)
Tools:
- Drill driver and bits 1/8 and 5/32
- Square metal file to finish
- Hacksaw
- Tools for making labels (see section 1.26)
Drilling and printing templates, and Gerber files (PC-242) available in the website.

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1.19 - Remote control
A transmitter and a receiver of 12 channels perform the same functions as the "Command
Keypad", but wirelessly. It can operate at a distance of 30 meters or more. The transmitter uses
12V battery model 23, working frequency 315Mhz.
Remote Control sticker
(rear)
FUNCTIONS
1.- Volume Up
2:- Volume Down
3.- Back or Bonus (commercial mode)
4.- Forward (Tumble).
5.- Play Random or Reset. Back folder in BoomBox mode.
6.- Play ALB1 or Play ALBt1. Forward folder in BoomBox mode.
7.- Play ALB2 or ALBt2
8.- Play ALB3 or ALBt3. Pause in BoomBox mode.
9.- Play ALB4 or ALBt4. Volume Mic Up in BoomBox mode.
10.- Play ALB5 or ALBt5. Volume Mic Down in BoomBox mode.
11.- Play ALB6 or ALBt6.
12.- Play ALB7 or ALBt7.
NOTE: To play albums below
press a second time.
The keys for BoomBox and Albums can be configured
Receiver and Transmitter
Remote Control 12 channels 315Mhz
Model MX-KG12X-12

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1.20 - Table of characters assigned to the Command Keypad
First Touch
Album Name (1st touch)) Second Touch
Album Name (2nd touch)
Character
Assigned
ALB1 ALBt1
ALB2 ALBt2
ALB3 ALBt3
ALB4 ALBt4
ALB5 ALBt5
ALB6 ALBt6
ALB7 ALBt7
ALB8 ALBt8
ALB9 ALBt9
ALB10 ALBt10
ALB11 ALBt11
ALB12 ALBt12
ALB13 ALBt13
ALB14 ALBt14
ALB15 ALBt15
ALB# or ALBt# = Type of music according to the title of the album corresponding to the
music files (ID3 v1).
1.21 - Audio Amplifier
Use the original amplifier of the jukebox, if it is not possible to use two amplifiers TDA7293
(available on Ebay), it is also required a tor toroid transformer 200w 115V input and two outputs of
26V. See picture in the section: 4.14 – Stereo Audio Amplifier TDA7294
1.22 - Speakers
Use the original speakers if it is not possible to use a set of speakers consisting of bass,
middles and treble, connected as shown in the section 4.2.- Connection Diagram Jukebox RK4.
1.23 - Song Files Description
The song files must be in mp3 format, the name starts with 101 onwards, for example, the
file 101.mp3.
101 = File Name
mp3 = File type
ID3 v1: Artist, Title and Album
These three parameters are necessary for the RK4 program to work properly in the
"Album" the song type is defined.
For the mp3 format, use as sampling 128 Kbits /sec, with this sampling rate the fidelity of the
sound is guaranteed.