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CCS800 | Service manual | Chapter 8 | New mic assy on an old del-/ chairman unit
8
New microphone assembly on an old delegate-/ chairman
unit
Note
This chapter is applicable to delegate-/ chairman unit produced before April 2001 (week 0116).
This chapter supersede service information 3922 880 71111
8.1
Description
The mechanical construction of the microphone head is
simplified. A white plastic disc for light reflection has been
removed. The microphone head LED is now produced as one
moulding. The construction results in a slightly lower light
output of the LED ring.
To make the light output equal to the previous model LED ring
some resistors on the unit PCB have to be changed in the field
when mounting a new microphone assembly.
8.2
Implementation
Type number
LBB 3330/00
LBB 3330/50
LBB 3331/00
LBB 3331/50
Type number
LBB 333x/00
LBB 333x/50
8.3
Electrical modifications
There are no drivers on mic LED headboard. These are located on the main board. Electrically is nothing changed in the
head.
1.
New main board from HW01-03 onwards
A new LED driver circuitry is introduced for the new microphone head construction.
2.
Old main board HW01-02 and lower
To make the light output equal to the previous model LED ring some resistors on the unit PCB have to be changed in
the field when mounting a new microphone assembly.
8.3.1
Service microphone assemblies identification
Service microphones with new head assembly can be identified with the factory code number.
On the packing are 2 labels,
-
Service code number
-
Factory code number
The factory code number 12
Bosch Security Systems | 2005-01| 3922 880 21112
Hardware release
01-03
01-03
01-03
01-03
Service number
5322 242 10918
5322 242 10919
th
digit is now 2. See table chapter 8.2.
Changed item
Serial number
032665
014359
003156
001910
Factory number
3922 156
20222
3922 156
20232
en | 41
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