CCS800 |
Service manual | Chapter 7 | Diagnostics and faultfinding
en | 23
Bosch Security Systems | 2005-01| 3922 880 21112
7.3.1
Settings before you start measuring
•
Set the insertion switch (S1), located at the rear side, to the left position (“1”).
•
Set the potentiometer of the headphone volume (R201) to maximum (fully clockwise).
•
Set the mode switch (S2) to “auto mode 1” (fully counter clockwise).
•
Set the Volume control (S3) for the Delegate and Chairman units to maximum (fully clockwise).
•
Set the gain control potentiometer (R199) for the external microphone in the middle position.
•
Set the gain control potentiometer (R200) for the recorder input in the middle position.
•
Set AFS switch (S4) to Off (LBB 3310/10 only).
•
Remove the loudspeaker connector (X3) and mount a 25 Ohm resistor on X5 pt. 2 and 4 (M57, M59). See illustration
chapter 13.3.1.
7.3.2
Internal Supply Voltages
Connect the CPSU to the mains and measure the following internal supply lines, related to M2 (= GND):
Measuring points on the bottom layout are colored in blue (See chapter 13.3).
Measuring points
Measurement results
M6 (V+)
+19.5 V ± 400 mV
M7 (V-)
- 4.5 V ± 100 mV
M15
+15 V ± 750 mV
M25
+5 V ± 250 mV
M26
+7.5 V ± 350 mV
M27
+10 V ± 500 mV
7.3.3
Phantom supply of the external symmetrical microphone input
Measure the following internal supply lines, related to M133 (= GND):
Measuring points
Measurement results
M28
+12 V ± 600 mV
M131
+12 V ± 600 mV
M132
+12 V ± 600 mV
7.3.4
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.
On the CPSU board is the power supply voltage present after fuse F1 at measuring spot M9 (SUPP).
Reference:
X1
See Ch. 13.7
