Audio Integrating; Removal And Installation; System Functional Test - Piper 6X Maintenance Manual

WARNING: THE USER IS RESPONSIBLE FOR REFERING TO THE APPLICABLE VENDOR
PUBLICATION(S), WHEN SERVICING OR INSPECTING VENDOR EQUIPMENT
INSTALLED IN PIPER AIRCRAFT. (SEE INTRODUCTION - SUPPLEMENTARY
PUBLICATIONS.)
GMA-340
The Garmin GMA-340 Audio Panel integrates the audio switching, amplifier, and intercom system with a
marker beacon receiver. Maintenance of the GMA-340 is "on condition" only and, with the exception of
swapping complete units, should be performed only by a qualified avionics shop in accordance with the
GMA-340 Audio Panel Maintenance Manual (Garmin P/N 190-00149-02).
Information provided in this manual is intended to aid the removal and installation of the GMA-340 unit
and its associated wiring and to permit basic system functional test and adjustment.
A. Removal and Installation (See Figure 2.)
See Rack-Mounted Avionics, Removal and Installation, 39-10-00.
B. System Functional Test (See Figure 1.)
(1) On Ground
The following known good equipment is required prior to performing this test: microphone,
headset, speaker and avionics receivers.
(a) Lamp Test
1
2
(b) Fail-safe Operation Check
1
2
3
GARMIN
A O M
MKR
MUTE
SQ
LO
OFF/
VOL
SENS
PILOT
2F5
THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL

AUDIO INTEGRATING

Apply power to the unit by rotating the pilot intercom knob clockwise.
The test button checks the internal LED annunciator and marker beacon lamps.
Press TEST to confirm operation of the LED's. Cover the photocell with a finger and
observe that the LED annunciators dim automatically. Check the front panel back-
lighting and dimming function. Each annunciator contains a lamp for illumination.
Turn the unit off by rotating the pilot intercom knob counterclockwise.
Check fail-safe operation by exercising the COM 1 microphone, microphone key and
audio over the headphones.
Turn the unit back on to continue testing.
COM1 COM2 COM3
HI
COM1 COM2 COM3
MIC MIC MIC
GMA-340 Audio Panel
NAV1 NAV2
SPKR
COM
CABIN AUDIO
1/2
PA
Figure 1
GMA 340
TEST
DME ADF
SQ
PILOT
ICS ISOLATION
VOL
PULL
CREW
PASS
VOL CO-PILOT
23-50-00 PAGE 1
Jun 1/03