Diagnosis; Power On Sequence - Pioneer CDJ-850 Service Manual

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5. DIAGNOSIS

5.1 POWER ON SEQUENCE

A
AC IN (Plugging of the AC power cord)
Power supply (V+12_EUP, V+3R3R_EUP) to the Panel CPU starts.
Reset IC (IC1004) IC1004 (Pin 4): The Reset signal is sent to the Panel CPU (IC1007).
IC1007 (Pin 12): Receives the Reset signal.
Panel CPU
(IC1007) STANDBY mode is entered.
*FL display: Unlit.
STANDBY mode is shifted to POWER_ON mode.
"POWER ON" is displayed on the FL display.
B
Panel CPU
(IC1007)
IC1007 (Pin 45): Power supply to the Main CPU (IC103) starts.
IC1007 (Pin 40): The Reset signal is sent to the Main CPU (IC103).
IC103 (Pin 59): Receives the Reset signal.
The program is downloaded to IC301 (Audio DSP).
Main CPU
(IC103)
IC103 (Pin 158): The Reset signal is sent to the Audio DSP (IC301).
IC103 (Pin 69): The Reset signal is sent to the Servo DSP (IC201).
Main CPU (IC103) Communication between the Main CPU (IC103) and
C
Panel CPU (IC1007) Panel CPU (IC1007) starts.
IC301 (Pin 47): Receives the Reset signal.
Audio DSP (IC301)
IC201 (Pin 90): Receives the Reset signal.
Servo DSP (IC201)
Checking the inside SW
LD (Laser Diode) ON
Adjustment of tracking and focus offset
Spindle kick, focus sweep, and focus ON
D
Checking if focus is OK
Acceleration of spindle (200 ms)
CLV servo ON
CD drive
Waiting 300 ms
Tracking balance adjustment (Tracking open)
Tracking close
E
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.
F
The first track is searched for.
Playback (Muting OFF)
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1
2
POWER ON (Turn on the POWER switch.)
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-850
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3
If communication fails, "E–8709" will be
displayed on the FL display.
If the first check fails, measure the level of the S-shaped
waveform while the pickup lens is descending.
If the level of the S-shaped waveform is 0.88 Vp-p or less,
focusing is turned ON with RF gain increased.
If checking fails three times, "EJECT" will be
displayed on the FL display.
After TOC reading is completed
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4
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