Adcom GFP-750 User Manual

3. TROUBLE SHOOTING
Symptoms Possible Causes
Unit does not respond to front panel -AC power cord not connected
power switch or remote control power -Master On/Off switch is off
button.
Power LED is dimmer than the other -Preamp is muted. (Power LED is dimmed when outputs are muted.)
status LED’s.
No signal at main outputs
-Wrong source selected
-The external processor feature is activated {processor LED is on) without
the external processor either being on or connected properly. (The main
outputs are connected to the processor in inputs when in the external
processor feature is activated.)
-Preamp is muted. (Power LED Is dimmed when outputs are muted.)
No signal at tape outputs
Volume level is reduced when going to
passive mode
-The input device is on tape.
-The external processor feature is activated. (Processor LED is on)
{tape out is disconnected when tape is selected as the
source or the processor feature is activated.)
-A slight reduction in volume level is to be expected as the
active gain stages are bypassed when the passive
feature is engaged.
The volume and balance controls do
not function.
-The volume and balance controls are bypassed when
the processor feature is engaged. Either use the controls
on the external processor or switch the processor feature off.
4. CARE AND MAINTENANCE
The GFP-75(Ts steel chassis and extruded aluminum front panel are specially coated to provided a durable and
attractive finish. To remove dust and finger smudges, merely dampen a cloth and wipe off the chassis. Do not use
strong solvents or detergents. Many are very abrasive or corrosive. Never spray or pour any liquid <^to the
chassis or front panel. In the event of any liquid getting Into the chassis, unplug the unit from the AC outlet
immediately.
5. SERVICING
ACCOM’s Technical Service Department will be happy to answer all questions pertaining to the installation and
operation of your unit. In the unlikely event of difficulty, please contact us for prompt advice. If we cannot help you
resolve the problem Immediately, we may refer you to an authorized repair agency, or authorize the return of your
unit to our plant.
All written inquiries should be addressed to:
ADCOM Service Department
10 Timber Lane
Marlboro, NJ 07746 USA
(732) 683-2356 Phone (732) 683-9792 Fax
Telephone inquiries are welcome from Monday through Friday between 9 AM and 4 PM, Eastern Standard Time.
We will also be glad to answer any FAX inquiries. Please Include your phone and FAX numbers so we can
respond.
When inquiring about your unit, please include the serial number, the name of the dealer from whom you pur-
Chased the unit, and the date of purchase.
If we ask you to return the unit to us for service, we will issue a specific Return Authorization
UNDER NO CIRCUMSTANCES SHOULD THE UNIT BE SHIPPED TO US WITHOUT PROPER AUTHORIZA¬
TION OR PACKED IN ANYTHING OTHER THAN ITS ORIGINAL PACKING.
If the original packing has been lost, discarded or damaged, we will gladly supply replacement packaging at a
nominal charge. Please mention your need when you contact us. i quid
Always ship PREPAID via UPS (United Parcel Service) or other appropriate earner. FREIGHT COLLEO l bMiH-
MENTS WILL BE REFUSED. ^ ^ o ♦ i
DO NOT SHIP VIA PARCEL POST as the packaging will not necessarily withstand the handling by our h’ostai
Service.
6

Adcom GFP-750 Specifications

Audio Output Specifications

output level	1.0 V
THD+N @ rated output (20Hz to 20kHz) balanced	<0.025%
THD+N @ rated output (20Hz to 20kHz) unbalanced	<0.095%
THD+N @ rated output (1kHz) balanced	<0.015%
THD+N @ rated output (1kHz) unbalanced	<0.017%
output impedance balanced	<1200 Ω
output impedance unbalanced	<600 Ω
frequency response (balanced and unbalanced)	20Hz to 20kHz, -0.25dB to +0dB
IM distortions CCIF (balanced)	<0.009%
IM distortions CCIF (unbalanced)	<0.035%
SMPTE (balanced)	<0.05%
SMPTE (unbalanced)	<0.05%
signal to noise ratio (ref. to 1 volt) 'A' weighted (balanced)	>102 dB
signal to noise ratio (ref. to 1 volt) 'A' weighted (unbalanced)	>102 dB

Input Specifications

input impedance balanced	94 kΩ
input impedance unbalanced	47 kΩ
input sensitivity @ rated output balanced	183 mV
input sensitivity @ rated output unbalanced	365 mV

Power and Dimensions

power	115 VAC-50/60Hz
power consumption	30 VA
chassis dimensions	3 1/2” (89 mm) x 17" (432 mm) x 11" (279 mm)
maximum dimensions	4 1/8" (105 mm) x 17" (432 mm) x 12” (305 mm)
weight	6.8 kg
packed weight	7.7 kg