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Grommes~Precision 

Precision Electronics 

Grommes~Precision is an American manufacturer of original, custom, and private labeled audio/electronic components for use in commercial, consumer, and industrial applications since 1946. 

Grommes~Precision 

847-678-5350 — 800-SINCE-46 — FAX: 847-678-0511 

9101 King Ave. — Franklin Park, IL 60131 — USA 

www.grommesprecision.com 

Grommes~Precision is an American manufacturer of original, custom, and private labeled audio/electronic equipment for use in commercial, consumer, and industrial applications since 1946. 

Grommes~Precision 

Grommes~Precision 

847-599-1799 — 800-SINCE-46 — FAX: 847-599-6178 

1331 Estes Ave. — Gurnee, IL 60031 — USA 

www.grommesprecision.com 

G228 

INSTRUCTION MANUAL

 

Unpacking Procedures  ....  2 

Output Connections  ....  5 

Installation Information  ....  2 

The Auto-Mute Circuit  ....  6 

Description & Specifications  ....  3 

Operation Of Controls  ....  6 

Product Overview  ....  4 

Grounding  ....  7 

Input Connecting  ....  4 

Troubleshooting  ....  8 

Summary of Contents for Precision Electronics G228

Page 1: ...mes Precision is an American manufacturer of original custom and private labeled audio electronic equipment for use in commercial consumer and industrial applications since 1946 Grommes Precision Grommes Precision 847 599 1799 800 SINCE 46 FAX 847 599 6178 1331 Estes Ave Gurnee IL 60031 USA www grommesprecision com G228 INSTRUCTION MANUAL Unpacking Procedures 2 Output Connections 5 Installation In...

Page 2: ...d are nylon or plastic washers which will not only help protect the finish but also aid in retaining the screws TECHNICAL SUPPORT A troubleshooting chart is located at the end of this manual for your convenience If you are in need of further assistance you can reach our design engineers at 1 847 599 1799 Grommes Precision is based in Gurnee Illinois and is on Central Standard Time Our hours of ope...

Page 3: ...mplifier using IC circuitry It has 6 Microphone Auxiliary channels plus another AUX only channel having two selectable inputs Also featured is a mute Precedence switch that enables the 1st channel to mute all other channels or channels or channels 1 6 to mute the AUX only channel A red Peak LED indicates relative signal levels Optional isolation transformers are available for the 6 Microphone inpu...

Page 4: ...riginal custom and private labeled audio electronic equipment for use in commercial consumer and industrial applications since 1946 Auxiliary The Input Impedance of each Auxiliary input is 10K ohms Connect a CD player radio tuner or tape deck to any Auxiliary input using and audio patch cable having standard RCA type phono plug at each end The Auxiliary input of each channel is internally mixed wi...

Page 5: ...dio cable having a standard RCA type phono plug The other end of this cable will go to the high impedance or unbalanced input of the power amplifier Microphone Level Output This is a 150 to 600 ohm microphone level output balanced to ground This output is for connecting to a microphone input of another system Balanced shielded microphone cable must be used Connect the shield to the G228 ground scr...

Page 6: ...the G228 Master level to 70 of its rotation approximately 2 o clock D Turn the 1st channel level control up until the G228 s red LED flashes occasionally about once every 2 to 4 seconds Make a note of this position then turn it back down fully CCW E Do step D for each channel making a note of each control setting F Now turn each level control to the setting you noted for each channel G Turn your p...

Page 7: ...se in commercial consumer and industrial applications since 1946 IX GROUNDING The 3 wire AC power cord provides a ground to the AC power line conduit If your AC outlet is wired correctly grounding if the G228 is accomplished merely by plugging into the outlet Otherwise to en sure a good ground it may sometimes be necessary to attach a ground wire to the ground terminal of the G228 output strip and...

Page 8: ...anel Signal level Check that adequate input signal level is strong enough Input or output imped ance not matched Check that the proper input output line impedance matches the selected input output connections used Possible low resistance or shorted wiring across the audio in and or across the speaker out Check correct system wiring Grommes Precision is an American manufacturer of original custom a...

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