Sennheiser HMEC 26 - Testing and Fault Isolation; General 1001; Testing 1001

SENNHEISER ELECTRONIC GMBH & CO. KG
COMPONENT MAINTENANCE MANUAL
HMEC 26 SERIES
Page 1001
Feb 10/10
23-41-48
TESTING AND FAULT ISOLATION
1. General
NOTE: BEFORE YOU DISASSEMBLE THE HEADSET, DO THE TESTS DESCRIBED IN THIS SECTION TO FIND POSSIBLE
DEFECTS AND THE NECESSARY MAINTENANCE STEPS. IF YOU DO NOT FIND ANY DEFECTS, NO MORE
MAINTENANCE IS NECESSARY. YOU WILL ONLY NEED TO CLEAN THE COMPONENT, IF NECESSARY.
NOTE:
IF YOU FIND ANY DEFECTS, REFER TO THE RELATED STEPS TO FIND THE POSSIBLE CAUSE OF THE
MALFUNCTION.
NOTE:
AFTER YOU REPAIRED A COMPONENT OR REPLACED IT, DO THE TEST OF THE HEADSET AGAIN TO MAKE
SURE THAT YOU DID THE REPAIR PROCEDURE CORRECTLY.
2. Tools, Fixtures, Equipment and Consumables
A. Tools and Test Equipment
Table 1001 shows the test equipment and special tools that you need for the test of the Headset.
NOTE:
EQUIVALENT SUBSTITUTES TO THE LISTED ITEMS CAN BE USED.
3. Testing
WARNING: BEFORE YOU PUT ON THE HEADSET, MAKE SURE THAT THE SOUND LEVEL PRESSURE IS NOT
IN A HARMFUL RANGE.
CAUTION:
MAKE SURE THAT ALL SUPPLY VOLTAGES AND INPUT SIGNALS ARE SET TO THE CORRECT
VALUE. INCORRECT SETTINGS CAN CAUSE DAMAGE TO THE EQUIPMENT.
GTE NO. DESCRIPTION SPECIFICATION/TYPE SOURCE
1 Power supply U: 0-30 V DC adjustable
I: ≥500 mA
eff
Hum: <1%
Commercial
2 Sine wave generator AF Level adjustable to
775 mV
eff
at 1 kHz
Commercial
3 Multimeter U: 0-30 V DC
I: ≥500 mA
eff
Resolution ≤ 0.1 V
Commercial
4 Oscilloscope - Commercial
5 Intercom/ Audio system - Commercial
Table 1001
Tools and Test Equipment
Feb 10/10
Testing
and
Fault Isola-
tion