How To Check The Ic Communication; Ic Information; Power Switch - Pioneer N-50 Service Manual

1

5.3 HOW TO CHECK THE IC COMMUNICATION

The Major IC (MainCPU, SubCPU, DSP, DIR, DAC, etc.) communications checking method
A
The communications status with each LSI can be checked as follows:

Communications of MainCPUSubCPU
In about one minute after the Power ON, the function screen appears. If the display is switched by change-over of
functions, there is no problem in the communications.

Communications of SubCPUDSP (N-50, N-50-K/-S only)
In the event of DSP communications error, "Error 9" is displayed on the LCD.
If "Error 9" is not displayed, the communications have been established.

Communications of SubCPUDIR
Select DigitalIn1, and when the sound input to DigitalIn1 is output from Opt or Coax, the communications have been
established.
B

5.4 IC INFORMATION

Block Diagram
C
FB 3
I 4
LIM
D
E
F
24
1
2
J040-22601-001-0S

(POWER SWITCH)

V /V
BURL BURH
V V
CC CC
I I
delay FB
2.5 R
Normal
Soft-
R Burst
Start
V
SD
V
CC
LPF
V
OVP
TSD
V
Pin Layout
GND 1
V 2
CC
FB 3
I 4
LIM
Pin Definitions
Pin No. Pin Name
1
2
3
4
5
6,7,8 Drain
2
3
V str
5
V ref
OSC
V
PWM
S Q
LEB
R Q
250ns
S Q
R Q
good
CC
8 Drain
7 Drain
6 Drain
5 V
STR
Description
GND Ground
V Power Supply
CC
FB Feedback
I Peak Current Limit
LIM
V Startup
STR
SenseFET Drain
N-50
3
4
V Drain
CC
2 6 7 8
V cc
good
CC
8V/12V
Gate
driver
1 GND
V
OCP
4