Service manual

CA-6
CA CIRCUIT DESCRIPTIONS
For those CA chassis that have the keyboard and IR detector built onto the module, the schematics are
included. Keep in mind, however, that many of the various CA chassis have a keyboard and IR module that
is separate from the main board.
Microcontroller
VCC is provided to pin 27 of the microprocessor from the +5VSBF supply. While this voltage is relatively
low, IC6000 is fairly demanding in terms of current. This same voltage also powers the keyboard and IR
detector. Additionally, the +5VSBF is used as analog VCC and enters the micro at pin 18.
IC6002 serves as a reset IC for the main microprocessor. Note that it comes in a transistor type package.
It accurately resets the micro when SB voltage is detected. Pin 30 is the reset signal input for IC6000. The
micro enters reset state after detecting a low on pin 30 of 2µS or more.
When the micro receives a power on signal from either the keyboard or the remote, the degaussing control
pin 33 turns on the degaussing circuit for 760ms. At the same time a constant voltage level from pin 32
turns on the switched voltages in the power supply.
<<Figure CA-6>>
Horizontal and vertical synchronization pulses are fed into pins 1 and 2. These provide the microprocessor
the current sweep location of the beam, which is necessary to correctly interrupt main video for various
C6012M
C6013
L6001
+5VSB
+5VSBF
C6017
R6037M
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
36
26 27
28
29
30
31
32
33
34
35
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
HSYNC
VSYNC
AFC
FM_SD
NC
SYNC
A/D_KEY2
A/D_KEY1
NC
Y/C-SENSE
PiP_BRT
NC
CRT-PROT
MUTE
REMOTE
NC
NC
AVCC
HLF
RVCO
VHOLD
CVIN
CNVSS
XIN
XOUT
VSS
R
G
B
FB
VERT-SIZE
HORZ-SIZE
VOL
NC
AUD-SWITCH
PiPSWITCH1
AUX_SW1
NC
H/T
SCL1
SCL2
SDA1
SDA2
IDENT
RADIO/TV
DEG-CTL
POWER
CHASSIS-ID
RESET
OSC-OUT
OSC-IN
VCC
IC6000
VCC
GND
OUT
IC6002
C6016
C6056M D6001
CRY6002
PROV
L6002
R6060MR6035M
C6015M
C6014M
R6059M
CRY6001
R6034M
C6010M C6011M
C6008M
PROV
R6080
R6033M
C6009
R6032M
C6007M
R6031M
PROV
C6006
C6005M
C6098
R6030
L6007
+5VSBF
C6037
To IR6000
R6026
C6040M
C6092M
C6090M
C6093M
To Keyboard
+5VSBF
C6062M
R6001M
R6005M
R6012M
R6058M
D6002
R6053M
C6061M
C6079M
R6061M
C6058M
R6090M
Q6001
Q6002
C6068M
R6008M
R6002M
R6004M
R6003M
C6001M
C6024M
PROV
C6025M
PROV
C6033M
PROV
C6023M
R6082M
C6067M
R6084M
C6099
Q6003
C6066
PROV
C6064M
R6083M
R6040M
R6081M
C6057M
C6041M
C6094M
PROV
R6036M
C6018M
C6046M
C6045M
C6051M
C6052M
C6053M
C6095M
C6038M
C6055M
FLYBACK
V-RAMP
V-DRIVE
AFC
PiP-BAT
SYNC
Y/C-SENSE
CRT-PROTECTOR
MUTE
PWR-CTL
DEG-CTL
AUX-SWITCH1
PiP-SWITCH1
AUD-SWITCH
VOL-CTRL
HORZ-SIZE
VERT-SIZE
HALFTONE
FASTBLANK
B+UP
G+UP
R+UP
COMPOSITE
VIDEO IN
EEPROM
&Factory
Setup Ckt