Pioneer DDJ-T1 Service Manual page 26

1
[3-2] Rotary selector not controllable
A
No. Cause/Symptom Point to be checked
Defective
AUTO_LOOP
1 CDJ1 Assy
of the CDJ1
Defective
2 CDJ2 Assy
AUTO_LOOP
of the CDJ2
Defective
DJM
3 DJMB Assy
B
BROWSE
Defective
4 MAIN_UCOM UCOM Assy
(IC701)
[3-3] VRs or sliders not controllable
The variable controls on the CDJ1 and CDJ2 Assys or the sliders on the CHFD and CRFD ASSYs are not controllable.
No. Cause/Symptom Point to be checked
CDJ1/CDJ2 Assy
C
Loose
CHFD Assy
1
connection
CRFD Assy
CDJ1/CDJ2 Assy
Defective
2 CHFD Assy
sliders or VRs
CRFD Assy
Defective
3 UCOM Assy
MAIN_UCOM
D
(IC701)
VRs on the DJMB ASSY not controllable.
Loose
4 DJMB Assy
connection
5 Defective VRs DJMB Assy
Defective
6 MAIN_UCOM UCOM Assy
E
(IC701)
[3-4] NeedleSearch error
No. Cause/Symptom Point to be checked
CDC IC Error/
Needlepad dis-
abled (Incl. steps 4 UCOM/CDCB
1
and 5 of [4] Error
indications in the
6. Service Mode)
Only some of the
F
UCOM/CDCB
commands from
2
the needlepad are
recognized.
26
1
2
Item to be checked
Check that the signal lines (L_ENC1_1/
L_ENC1_2) are normal during rotation of
the rotary selector.
L_ENC1_1: CN3002-1 pin
L_ENC1_2: CN3002-2 pin
Check that the signal lines (L_ENC2_1/
L_ENC2_2) are normal during rotation of
the rotary selector.
L_ENC2_1: CN3502-6 pin
L_ENC2_2: CN3502-5 pin
Check that the signal lines (CUR_ENC1/
CUR_ENC2) are normal during rotation of
the rotary selector.
CUR_ENC1: CN4002-21 pin
CUR_ENC2: CN4002-22 pin
If the symptom persists after the above
corrections.
Item to be checked
Check for any loose connections on the
signal line from the MAIN_UCOM (IC701)
to each variable control or slider.
VRs: Check the signal level.
Tempo slider: Check the levels of the
ADCT and ADIN signals.
CHFD, CRFD: Check the signal level.
If the symptom persists after the above
corrections.
Check for any loose connections on the signal
line from each VR to Analog SW_IC (IC4001,
IC4002, IC4003) and the main microcomputer
(IC701).
Signal line: AD_0–4, AD_SW_A, AD_SW_B
VRs: Check the signal level.
If the symptom persists after the above
corrections.
Item to be checked
Check the communication waveform
between the needlepad and the MAIN_
Assy
UCOM (IC701).
Check that no foreign matter is between
Assy the Needlepad board and the cabinet.
2
3
How to distinguish a defective point and/or corrective action
If the signals are not normal, check the connections of the
signal lines. If the connections are properly made, the
rotary selector (S3030) may be defective. Replace it.
If the signals are not normal, check the connections of the
signal lines. If the connections are properly made, the
rotary selector (S3527) may be defective. Replace it.
If the signals are not normal, check the connections of the
signal lines. If the connections are properly made, the
rotary selector (S4027) may be defective. Replace it.
Check the mounting status of the MAIN_UCOM (IC701).
If it is properly mounted, then the IC701 itself
may be defective.
How to distinguish a defective point and/or corrective action
If any connection on the signal line is improper, resolder
the parts.
VRs: If the voltage of the signal from a VR (Pin 2) does not
change between 3.3 V and 0 V, that VR may be defective.
Tempo slider: If the value of the voltage of the ADCT signal
(Pin 4) is other than 1.65 V, or if the voltage of the ADIN
signal (Pin 2) does not change between 3.3 V and 0 V, the
tempo slider may be defective.
CHFD, CRFD: If the voltage of the signal from the CHFD
or CRFD (Pin 2) does not change between 3.3 V and 0 V,
the slider may be defective.
Check the mounting status of the MAIN_UCOM (IC701).
If it is properly mounted, then the IC701 itself
may be defective.
If any connection on the signal line is improper, resolder
the parts.
VRs: If the voltage of the signal from a VR (Pin 2) does not
change between 3.3 V and 0 V, that VR may be defective.
Check the mounting statuses of the MAIN_UCOM (IC701)
and the Analog SW_IC (IC4001, IC4002, IC4003).
If they are properly mounted, then the IC701, IC4001,
IC4002, or IC4003 may be defective.
How to distinguish a defective point and/or corrective action
If the waveform is not proper, check the communication
line, resistors, and capacitors.
Check also that the cables between the boards and their
connections are proper.
If the normal status is not recovered after all above steps
are performed, the CDC IC or the MAIN_UCOM (IC701)
may be defective.
If the Needlepad operates improperly although there is no
foreign matter between the Needlepad board and the
cabinet, check [2] above.
DDJ-T1
3
4
Reference
Each Signal
Levels
Each Signal
Levels
Each Signal
Levels
Basic Operation
Check of the
MAIN_UCOM
Reference
—
Each Signal
Levels
Basic Operation
Check of the
MAIN_UCOM
—
Each Signal
Levels
Basic Operation
Check of the
MAIN_UCOM
Reference
10.17 WAVEFORMS
CDC IC control 1/2
4