Service manual

CB-8
CB CIRCUIT DESCRIPTIONS
signals entering IC2200 at pins 4 and 2 respectively and component video entering at pins 37 through 39.
Note here that component video cannot be used as PiP. Lastly, pin 14 of IC6000 switches a DC level to
alter the mute state of the audio amplifier.
Memory
The EEPROM, IC6001, is a small but vital part of the CB receiver. This 512 byte memory chip is respon-
sible for storing servicer adjustments, channel information, and user settings, even when power is removed
from the set. This information is transferred on the clock and data lines from the micro into pins 5 and 6.
The EEPROM is powered by the +5VSBF source at pin 8.
1
2
3
45
6
7
8
IC6001
R6049
R6050M
+5VSBF
L6003
C6020
C6021M
1
2
3
4
5
+5VSBF
R6072R6039M
C6019M
R6046M
R6045M
R6047M
R6048M
C6047MC6048MC6049MC6050M
IDENT
DATA2DATA1
CLOCK2CLOCK1
R6041R6042MR6043R6044M
CLOCK2
DATA2
(IC6000) 3536373839
Clock & Data
for IF, Video
and Audio
4G9
<<Figure CB-8>>
IC Location Part # Notes
IC6000 221-01388 All Models
IC6001 221-00745-05 All Models
IC6002 221-01177A All Models
<<Table CB-2>>