Pioneer CDJ-850 Service Manual page 28

1
A [7] DRIVE ASSY
[7-1] Improper operation of the loading mechanism
No. Cause Diagnostics Point
Cables
Loose MAIN Assy
1
connections
JINT Assy
SLMB Assy
MAIN Assy
2 Signal errors
JINT Assy
SLMB Assy
B
3 Power failure MAIN Assy
No loading (There is an abnormal noise.)
No. Cause Diagnostics Point
Slotin Mecha
Improper
1
assembling
SLMB Assy
MAIN Assy
Loose
2 connections JINT Assy
Signal errors SLMB Assy
C
[7-2] The stepper does not work.
No. Cause Diagnostics Point
Loose MAIN Assy
1
connections
JINT Assy
2 Signal errors MAIN Assy
3 Power failure MAIN Assy
D
[7-3] No CD playback
No. Cause Diagnostics Point
1 Short switch CNCT Assy
Any foreign TM Assy-S
2
matter attached (Traverse mecha)
3 Defective pickup MAIN Assy
4 — Service mode
E
F
28
1
2
Item to be Checked
Check the connection of the motor-drive signal
line LO±. Check that the wires between the
loading motor (DC motor) and the SLMB Assy
are securely soldered. Check also the wires
are not broken.
Check the connections and waveforms of the
LPS1 and LPS2 signal lines. In the normal state,
the LPS1 and LPS2 signals becomes "L" when
the loading detection SWs(S1701 and S1702)
are set to ON.
Check the power voltages.
V+7R6_M, V+5R6_M, VREF1R65,
V+3R3_B, V+3R3, V+1R2A
Item to be Checked
Check if the SW lever has shifted on the
Assy loading detection SWs (S1701 and S1702)
on the SLMB Assy.
Check the waveforms on the LPS1 and
LPS2 signal lines.
Item to be Checked
Check the connection of the stepping-motor
drive signal line ST1± and ST2±.
Check the waveform of INSW (INSIDE)
signal. In the normal state,The INSIDE SW of
TM Assy-S (Traverse mecha) becomes "L"
when the INSIDE SW is set to ON.
Check the power voltages.
V+7R6_M, V+5R6_M, VREF1R65,
V+3R3_B, V+3R3, V+1R2A
Item to be Checked
Short switch S2501 is in the off (open)
state.
Check if any foreign matter, such as
shavings, dirt, or dust, is attached to the
lens of the Pickup Assy.
Check the LD current value.
Measure the actuator resistance value.
If the symptom persists after the above
corrections, check operations of the CD
drive in Service mode.
2
3
Corrective Action
If soldering is improper, resolder it.
If the wires are broken, replace them.
If the signal waveform is not proper, loose connection
and the loading detection SWs (S1701 and S1702)
may be improperly soldered or defective.
For any power-supply section that does not output
the voltage, check the mounting statuses of the
regulator IC and its peripheral parts.
Corrective Action
If assembling is improper, resolder it.
If the signal waveform is not proper, loose connection
and the loading detection SWs (S1701 and S1702)
may be improperly soldered or defective.
Corrective Action
If connection is improper, resolder it.
If the signal is not proper, check the connections.
If connections are properly made, replace the
TM Assy-S (traverse mecha).
For any power-supply section that does not output
the voltage, check the mounting statuses of the
regulator IC and its peripheral parts. Replace it.
Corrective Action
In the normal operation, turn the short switch to
off (open).
Clean a lens.
Refer to the "5.3 Diagnosis of the Pickup Assy."
Check operations of the CD drive, referring to the
procedures described in "6. SERVICE MODE."
If the CD drive functions improperly,
see "[8] SERVICE MODE" in this section.
CDJ-850
3
4
Reference
—
10.14
WAVEFORMS
11 12
4.3 POWER SUPPLY
BLOCK DIAGRAM
Reference
—
10.14
WAVEFORMS
11 12
Reference
—
10.15 EACH
SIGNAL LEVEL
O
4.3 POWER SUPPLY
BLOCK DIAGRAM
Reference
—
—
5.3 Diagnosis of
the Pickup Assy
6. Service mode
4