Diagnosis; Power On Sequence - Pioneer CDJ-350 Service Manual

5

5. DIAGNOSIS

5.1 POWER ON SEQUENCE

AC IN (Plugging of the AC power cord)
Power supply (EV +5PaneCPU) to the Panel CPU starts.
Reset IC The Reset signal is sent to the IC502 Panel CPU.
IC501 (Pin 12) receives the Reset signal.
Panel CPU
STANDBY mode is entered.
*FL display: Unlit. The STANDBY/ON LED is lit in red.
POWER ON (Press the STANDBY/ON key.)
STANDBY mode is shifted to ON mode.
"POWER ON" is displayed on the FL display.
The STANDBY/ON LED is lit in green.
Panel CPU
Power supply to the Main CPU (Pin 4 of IC501) starts.
The Reset signal is sent to the IC501 (Pin 40) Main CPU.
IC103 (Pin 59) receives the Reset signal.
The program is downloaded to IC301 (audio DSP).
Main CPU
The Reset signal is sent to the IC103 (Pin 158) Audio DSP.
The Reset signal is sent to the IC103 (Pin 69) servo DSP.
Main CPU Communication between the main CPU and
Panel CPU audio CPU starts.
IC301 (Pin 47) receives the Reset signal.
Audio DSP
Servo DSP IC201 (Pin 90) receives the Reset signal.
Checking the inside SW
LD (Laser Diode) ON
Adjustment of tracking and focus offset
Spindle kick, focus sweep, and focus ON
Checking if focus is OK
Acceleration of spindle (100 ms)
CLV servo ON
Waiting 300 ms
CD drive
Tracking balance adjustment (Tracking open)
Tracking close
GFS (RF lock) check
TOC reading
Depending on the accuracy
of the stepper, the TOC
position memory will be
located after the unit is
turned ON.
The first track is searched for.
Playback (Muting OFF)
5
6
Focus balance adjustment
Focus gain adjustment
Tracking gain adjustment
RF gain adjustment
If the pickup is reading the
program area, it will jump
to the TOC area.
CDJ-350
6
7
If communication fails, "E–8709" will be
displayed on the FL display.
If checking fails once, the S-shaped waveform
will be measured with RF gain increased.
If the level of the S-shaped waveform is 0.88 Vp-p or less,
focusing is turned ON with OEIC and RG gains increased.
If checking fails three times, "EJECT" will be
displayed on the FL display.
After TOC reading is completed
7
8
A
B
C
D
E
F
19
8