Crown D-150 - Service and Repair

. Circuit
put
Osciflascope
Voltohmmeter
WOM). ©»
Breaker
Capable of displaying
__4
10
megahertz
signal.
E Low-voltage resistance
prebe:(L00mv range!
High-voltage resistance
probe (1.5 v range).
Sine/ square wave avait-
able: flat frequency.
response.
Reasonable accuracy at
ZOW without cutting”
into voltage at high
15-ampere-rating.
AC Line:
Monitor
AC Voltmeter ’
Filter
intermodulation
Distortion
Analyzer
purniay Load
*“Pealereading meter:
100 my low range.
20-20KHz bandpass,
jow. noise.
2/4, 8 Ohm; able to
dissipate SOOW without
strain; less than:10%
reactive component at
any frequericy up to's
times the highest test
frequency.
(lOOKHz x § = S00KH2
service and testing.
(Cow. voltage probe).
- Check semiconductor
junctions for opens or
: Provide test Signals for
| service and checkout.
| CLOKH2 sq; 20KHz sine)
Check power consumption.
in AG-ine to amplifier;
protects.circuitry- from.
overload if power supply
has. shorted. 5
“olvionitor line voltage
“for amplifier testing
Keep line voltage at
120Y during tests.
Sel output evel for
testing; Cheek noise
level.
Batween. amplifier and
voltmeter in noise test.
Check IM distortion ‘from
150W to 15 MW.
* Cheek amplifier per-
formance under load.
TABLE 8-1
MUST OF TEST EQUIPMENT
21
Monitoring output during
information avaitabies
or &@uivalént
Wavetek 130-Series
or equivalent
Sirapsors 390 (panel ©
meter Y379y 0
or equivalent
from CROWN:
Superior Powerstat
1
or’
Hewlett-Packard 400F
information available
from CROWN.
Available from CROWN
information available
from CROWN.