Adcom GFP-750 - Manual (Page 7)

3. TROUBLE SHOOTING
Symptoms
Unit does not respond to front panel
power switch or remote control power
button.
Power LED is dimmer than the other
status LED’s.
Possible Causes
-AC power cord not connected
-Master On/Off switch is off
-Preamp is muted. (Power LED is dimmed when outputs are muted.)
No signal at main outputs
No signal at tape outputs
Volume level is reduced when going to
passive mode
The volume and balance controls do
not function.
4. CARE AND MAINTENANCE
-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.)
-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 are bypassed when
the processor feature is engaged. Either use the controls
on the external processor or switch the processor feature off.
The GFP-75ffs 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 onto 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 number for your use.
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.
Always ship PREPAID via UPS (United Parcel Service) or other appropriate carrier. FREIGHT COLLECT SHIP­
MENTS WILL BE REFUSED.
DO NOT SHIP VIA PARCEL POST as the packaging will not necessarily withstand the handling by our Postal
Service.