The Mode Switch - Philips CCS 800 Service Manual

10.2.11 The mode switch

By use of a combination of different voltage levels at CTRL-L1 and CTRL-L2 each mode of the CPSU can be passed on
to the Delegate and Chairman units.
X10
S240
X110
Set the "mode switch" (S240) is each position and measure the voltages at M30, M31, M32, M33, M4 and M5 related to
M2 (GND).
Mode switch
position (S240) M33 (bit 3)
Auto-1 0
Auto-2 0
Auto-3 0
Auto-4 0
Open-1 0
Open-2 0
Open-3 0
Open 4 0
Override 10
Chairman only 10
Test 10
Tolerances: 10V ±500 mV
15V ±750mV
LBB 3310/00, 3330/00 and 3331/00
4822 861 11006
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
M32 (bit 2) M31 (bit 1)
10
10
10
10
15
15
15
15
10
10
10
X205 Mx*
25Ω
M2
(GND) (GND)
M150 M151
2 7 2 5 X150
Telephone
R IN
Figure 13
Measurement values for A1 (V)
M30 (bit 0)
0 0
0 10
10 0
10 10
0 0
0 10
10 0
10 10
0 0
0 10
10 0
page: 25
SERVICE MANUAL
A1
+
V
GND
-
* Mx Signal
M30 BIT 0
M31 BIT 1
M32 BIT 2
M33 BIT 3
M4 CTRL-L1
M5 CTRL-L2
003_013.cdr
M4 (Control-L1) M5 (Control-L2)
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
1.0
1.0
2.5
2.9
2.9
2.9
2.9
5.7
5.7
5.7
5.7
5.7
>14
1.0
Date of issue:
July 1998