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Popular Pioneer DRM-1804X Manual Pages
Service Manual - Page 1
...ROM CHANGER
DRM-1804X
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S),
Type
Model DRM -1804X
Power Requirement
Remarks
TUCGM
C
AC100 -24OV
1. operation is charged ; CONTENTS
CHAPTER 1
1.1 SAFETY INFORMATION 1.2 SPECIFICATIONS 1.3 PANEL FACILITIES 1.4 BLOCK DIAGRAM 1.5 ADJUSTMENTS 1.6 PARTS LIST FOR PACKING AND
EXPLODED VIEWS 1.7 PCB PARTS LIST
1-2 1-4 1-5 1-6 1-7
1-23...
Service Manual - Page 2
... the PIONEER recommended replacement one, shown in the parts list in this Service Manual, may cause birth defects or other hazards. Also, when soldering do not inhale any smoke or fumes produced. Any
current measured must be obtained by them necessarily can be of the appliance (input/output terminals, screwheads, metal overlays, control shaft, etc.).
DRM-1804X...
Service Manual - Page 3
... 7.
1-3
nth spirr•n Ar urkopplad.
IMPORTANT THIS PIONEER APPARATUS CONTAINS LASER OF CLASS 1 SERVICING OPERATION OF THE APPARATUS SHOULD BE DONE BY A SPECIALLY INSTRUCTED PERSON. DRM-1804X
(FOR EUROPEAN MODEL ONLY)
-
THERE IS A WARNING SIGN ACCORDING TO PICTURE 1 INSIDE THE DEVICE CLOSE TO THE LASER DIODE. ALSO, CERTAIN ELECTFICAL PARTS MN CONTAIN OUAICALS INTIM AS KNOWN III...
Service Manual - Page 5
...set this switch ON when using the built-in all three maga- NOTE: The changer dose not supply terminator power for external terminators. Be sure to other SCSI devices. C) Power switch cap slot
Install... is ON.
© BUSY indicator
Indicates the state of these buttons to wall outlet. DRM-1804X
1.3 PANEL FACILITIES
FRONT
4°;
zine slots.
© Magazine slots
AO/
0
a
...
Service Manual - Page 9
... to make the MPC window pop up. COM : Removes MPC from memory. DRM-1804X
1.5.2 FUNCTION OF PERSONAL COMPUTER FOR SERVICING
Use the floppy disc furnished with the product.
1. Execution of the next program removes MPC from memory MPC is in memory. Program Installation and Removal
Multi-play control program (2) MPCRMV. Fig. 2 MPC Window
Multi...
Service Manual - Page 12
DRM-1804X
Command Mnemonic
Command
Explanation
? X
CDP MODEL NAME REQUEST
Returns the model name of the playback disc in 8 characters (N1 -N8).
No search address has not been found.
N1 : Disc loading 0 : no
1 : yes
N2 : Audio track 0 : none 1 : available X : unknown
N3 : Data track
0 : none 1 : available X : unknown
N4 : CDV
0 : no nagazine has not been installed. Error ...
Service Manual - Page 14
... : Lights up during aging. DRM-1804X
1.5.3 ENTERING AGING MODE
After setting the magazine containing the necessary discs in place, turn the DIP SW 5 to OFF. The aging operating mode can be obtained. Once the player command in progress, the front panel LED will be read .
if the error
LOCKED
code can be
read normally from...
Service Manual - Page 15
...Adjustment
• Objective
Verify the DC offset for the focus error amp.
• Symptom when out The model does not focus in Normal speed.
1.
OFS)
None ...Settings]
• Player state
• Adjustment location
• Disc
[Procedure]
1. Verify the VCO frequency at TP2, pint is 0V ±0.1V. 2. Stopped (just the Power switch ON)
VR7 (PLL OFFSET) L2 (VCO. DRM-1804X...
Service Manual - Page 16
.... (See Fig. 4.)
[Settings]
• Player state
• Adjustment location
Focus and spindle are closed in order. 3. Skips tracks.
of the pickup LD component.
• Disc
YEDS - 7
[Procedure]
1. Slowly turn the screwdriver clockwise past the null point, and align the grating with the point where the tracking
error first reaches maximum. DRM-1804X
3. Slit for...
Service Manual - Page 17
...17 TP1
Pin4 (TRK. This connection may be via a low pass filter. (See Fig. 6.)
[Settings]
50mV/division 5ms/division DC mode
• Player state
• Adjustment location
• Disc
Focus and...or track search is impossible. Close the focus servo and the spindle servo. 3. Tracking Error Balance Adjustment
• Objective
To verify that the voltage at the center of adjustment
&#...
Service Manual - Page 18
... with a Phillips screwdriver so that the eye pattern can be played but not others.
DRM-1804X
5. When the adjustment is completed, lock the radial and tangential adjustment screw. some discs...
• Objective
To adjust the angle of the pickup relative to TP3, pinl (RF).
[Settings]
20mV/division 200ns/division AC mode
• Player state • Adjustment
location
• Disc...
Service Manual - Page 19
of Adjustment
6. DRM-1804X
Out of Adjustment
---FI.
-moomirigIr ly
1
Optimum Adjustment
Out of Adjustment
6 #.4),4
Eye Pattern
Out of Adjustment
Optimum ...and put the player into play mode. 3. Move the pickup to TP3, • Player state pinl (RF).
[Settings]
50mV/division 10ms/division AC mode
• Adjustment location
• Disc
Play VR5 YEDS - 7
[Procedure]
1.
Service Manual - Page 20
...
• Adjustment location
• Disc
Play VR4 (FCS. Pin1
TN 1.5 k
(10:1)
IFCS. DRM-1804X
7. of adjustment
• Measurement instrument connections
See Fig. 11.
• Player state
[Settings] CH1 : 20mV/division CH2 : 5mV/division X- Move the pickup to 1kHz and 1Vp -
p. 2. Set the AF generator output to halfway across the disc (R = 35mm). 3. Focus Servo Loop...
Service Manual - Page 22
...track search is no variation in succession.
10. Tracking Error Balance Re-adjustment
• Objective
To verify that the...Settings]
50mV/division 5ms/division DC mode
• Player state
• Adjustment location
• Disc
Focus and spindle servos closed and tracking servo open VR1 (TRK. Tracking Servo Loop Gain Adjustment" has been completed, adjust to TP1, pin4 (TRK. DRM-1804X...
Service Manual - Page 31
... orders, we may supply only the chapter 2. CD-ROM CHANGER
DRM-1804X
CHAPTER 2
CONTENTS
CHAPTER 2
2.1 PACKING AND EXPLODED VIEWS •- • 2-2
2.2 SCHEMATIC AND PCB CONNECTION
DIAGRAMS
2-13
PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153, Japan
PIONEER ELECTRONICS SERVICE INC. PIONEER ELECTRONICS OF CANADA, INC. 300 Allstate Parkway Markham, Ontario L3R...
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