O u t p u t
C o n v e r s i o n
For 150 O output, the following procedure should be
used to parallel the windings of the output transformer,
T 4 0 2 , Figure 8.
1. Disconnect the unit from the power s o u r c e .
2. Clip the B L U E and V I O L E T output transformer leads
from the printed circuit board at points #27 and #28.
3. Solder the B L U E transformer wire to the G R E E N
w i r e a t t h e O U T P U T t e r m i n a l s t r i p , T B 3 0 2 , marked HI.
4. Solderthe V I O L E T transformer wire to the G R A Y wire
at the O U T P U T terminal strip, T B 3 0 2 , marked L O .
The 5152 has been designed so that both the direct
and transformer outputs may be used simultaneously.
P r o o f of P e r f o r m a n c e
All performance c h e c k s are in-cabinet procedures to
be used for c h e c k i n g specifications after repair or for
incoming quality control inspection.
N O T E : All m e a s u r e m e n t s should be m a d e with the
unit and test equipment power c o r d s connected to a
normal 120 V A C or 2 4 0 V A C 5 0 / 6 0 Hz line s o u r c e .
W A R N I N G
T H I S S E C T I O N O F T H E M A N U A L
C O N T A I N S S E R V I C E I N S T R U C T I O N S
F O R U S E B Y Q U A L I F I E D S E R V I C E
P E R S O N N E L ONLY.
F I G U R E 1 0 , R E V E R S E R I A A
E Q U A L I Z A T I O N N E T W O R K
D O
N O T U S E S H I E L D E D C A B L E A T T H E O U T P U T O F
T H E F I L T E R ; S T R A P D I R E C T L Y T O T H E I N P U T O F
T H E V O L T M E T E R ,
A C V O L T M E T E R
To
MIC
CHANNEL
UNDER TEST
F I G U R E 1 2 , 4 0 d B ,
6 0 0
n
P A D
The following test equipment is r e c o m m e n d e d :
A U D I O T E S T O S C I L L A T O R
H A R M O N I C D I S T O R T I O N A N A L Y Z E R
40 d B PAD [150 O)
R E V E R S E RIAA E Q U A L I Z A T I O N N E T W O R K
20 kHz F I L T E R
A L T E R N A T E 4 0 d B P A D [ 6 0 0
O)
Krohn-Hite 4100, or equivalent.
Hewlett-Packard model 3 3 3 A , or equivalent.
S e e Figure 9
S e e Figure 10
S e e Figure 11
S e e Figure 12
Figure 8.
F I G U R E 9 , 4 0 d B ,
1 5 0
n
P A D
H E W L E T T
P A C K A R D
3 3 3 A O R
3 3 1 A
F I G U R E 1 1 , 2 0 K H Z F I L T E R
A L T E R N A T E O S C I L L A T O R S E T U P : Z = 6 0 0 n
2 0 K H Z F I L T E R
O S C I L L A T O R I N
To P H O N O I N
150 A BAL
K R O H N - H I T E
4 1 0 0
To
M I C
C H A N N E L
U N D E R T E S T
O S C I L L A T O R
4 0
dB
P A D
K R O H N - H I T E
4 1 0 0
O S C I L L A T O R
4 0
dB
P A D
