Supply Current Measurement; Audio-Contr To Loudspeaker Circuit - Philips CCS 800 Service Manual

10.2.4 Supply current measurement

Measure the supply current from V+ by means of a current meter in the power supply line itself: this should be between
30mA and 40mA.
~
~ 90 ... 264V AC / 24V DC

10.2.5 AUDIO-CONTR to Loudspeaker circuit

Noise level
Measure first the noise, A-weighted & rms, from the loudspeaker-signal between (symmetrical) M57 and M59 (see figure
2):
Noise level (A-weighted): < -70dBV.
X10
X110
LBB 3310/00, 3330/00 and 3331/00
4822 861 11006
K2
Power Supply 1,2,3
4,5,6
90 ... 264V AC
~ ~
Power Supply
AC
24V DC
PCB CPSU
Loudspeaker
(GND)
M110 M111 M121 M122 M124
6 9 4 8
Line-IN Rec-IN Rec-IN
L
A1
A
+ -
X10
3
V+
1
V-
Figure 1
X205 M59
25Ω
M57
(GND) (GND)
M150 M151
X150
2 7 2 5
Telephone
R IN
Figure 2
page: 14
SERVICE MANUAL
PCB
CPSU
003_001.cdr
A1
+
V
-
003_002.cdr
Date of issue:
July 1998