Philips CDR779 Service Manual page 64

GB 64 8.
Block Diagram
V
SSA2
D1 D2 D3 D4 V V
SSA1 DDA1
8 9 10 4 14
11
12
R1
ADC
13
R2
V
7
ref
V
RIN
GENERATOR
40
SCL
39
SDA MICROCONTROLLER
INTERFACE
41
RAB
42
SILD
2
HFIN
DIGITAL
1
PLL
HFREF
FRONT
3
END
ISLICE
6
I
ref
EFM
DEMODULATOR
25
TEST1
31
TEST
TEST2
44
TEST3
SRAM
24
SELPLL
16
CRIN
15
TIMING
CROUT
RAM
26
CL16 ADDRESSER
49
CL11/4
48
SBSY
47
SFSY
SUBCODE
46
PROCESSOR
SUB
45
RCK
DECODER
43 MICRO-
STATUS
CONTROLLER
VERSATILE PINS
INTERFACE
INTERFACE
38
RESET
63 34
V1 V2/
V3
Figure 8-20
Pin Configuration
HFREF 1
HFIN 2
ISLICE 3
V 4
SSA1
V 5
DDA1
I 6
ref
V 7
RIN
D1 8
D2 9
D3 10
D4 11
R1 12
R2 13
V 14
SSA2
CROUT 15
CRIN 16
Figure 8-21
CDR779 Faultfinding Guide
V V
DDA2 SSD2
V V V V
SSD1 SSD3 DDD1(P) DDD2(C)
5 17 33 50 58 52 57
PRE- CONTROL
PROCESSING FUNCTION
54
OUTPUT 55
STAGES
56
CONTROL
PART
64
59
MOTOR
60
CONTROL
ERROR
CORRECTOR
53
FLAGS
AUDIO
PROCESSOR
EBU
51
INTERFACE
30
29
SERIAL
DATA
28
INTERFACE
27
37
SERIAL
35
DATA
(LOOPBACK)
36
INTERFACE
PEAK
DETECT
20
21
BITSTREAM
18
DAC
19
22
KILL 23
61 62 32
CL96532086_051.eps
V4 V5 KILL
48
47
46
45
44
43
42
41
SAA7324
40
39
38
37
36
35
34
33
CL96532086_052.eps
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8.3.4 TDA7073A Power Drivers (7021, 7022)
Description
The TDA7073A is a dual power driver circuit for servo
systems with a single supply. In this configuration it is used
to drive the sledge, tray, focus and radial.
RA
FO
Measurements
SL
Keep microprocessor 7202 in reset by forcing pin 7 of
connector 1208 to +5V. Connect the power supply as
described above in "1.1.1. Supply Voltages". Check the
LDON
following voltages :
MOTO1
MOTO2
Pin
CFLG
5
5
DOBM
1
2
EF
6
SCLK
WCLK
7
DATA
1
SCLI
2
WCLI
6
SDI
7
V
neg
V
pos
LN
LP
RN
RP
Pin
9
080999
12
13
16
9
12
13
16
SBSY
SFSY
SUB
RCK
8.3.5 BA6856FP Turn Table Motor Driver (7020)
TEST3
STATUS
Description
SILD
This component is a 3 phase, full wave pseudo linear driving
RAB
system with inbuilt Hall Bias circuit and 3 phase parallel
SCL
output.
SDA
RESET
Measurements
SCLI
Keep processor 7202 in reset by forcing pin 7 of connector
SDI
1208 to +5V. The outputs 9, 10, 11 of connector 1006 are 0V.
WCLI
Pin 21 of the motor driver 7020 is 2.5V ( 10%.
V2/V3
Pin 22 of the motor driver 7020 is 2.5V ( 10%.
V
SSD1
Pin 23 of the motor driver 7020 is 0V.
Pin 19 of the motor driver 7020 is 5V ( 10%.
Put the processor out of reset to continue the measurement.
Check MOT1 at pin 59 of CD10. The duty cycle of the output
should be 50%. Check wave form at pin 11 of 7005-D :
amplitude 5V + 5% duty cycle 50%.
The motor driver 7020 can be measured dynamically by
connecting a hall motor to the application panel. Apply a
pulse of 1V 10Hz and 15% duty cycle to pin 22 (Ec) as input
value with reference to pin 21 (Ecr=2.5V). Measure the
output signals on the driver. This will give as response a
square wave on pin 17 and pin 18. When a positive voltage
Location Value
12V ± 10%
7021
12V ± 10%
7022
1.65V ± 10%
7022
1.65V ± 10%
7022
1.65V ± 10%
7022
1.65V ± 10%
7022
5.0 ± 10%
7021
5.0 ± 10%
7021
1.65V ± 10%
7021
1.65V ± 10%
7021
CL96532086_053.eps
Figure 8-22
Location Value DC
5.8V ± 10%
7022 FOC
7022 FOC 5.8V
7022 RAD 5.8V
7022 RAD 5.8V
7021 SLE 5.8V
7021 SLE 5.8V
7021 TRAY- 5.8V
7021 TRAY+ 5.8V
CL96532086_054.eps
Figure 8-23
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