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CX-JN331/JPK331
SERVICE MANUAL E Model
Ver. 1.0 2005.05




CX-JN331 is the amplifier, CD player, tape deck
and tuner section in JAX-N331.
CX-JPK331 is the amplifier, CD player, tape deck
and tuner section in JAX-PK331.



Model Name Using Similar Mechanism CX-JN33/JPK33
CD CD Mechanism Type CDM74KS-F1BD81C
Section Base Unit Name BU-F1BD81C
Optical Pick-up Name KSM-215DCP
Model Name Using Similar Mechanism CX-JN33/JPK33
Tape deck
CWM43FF13 (JPK331)
Section Tape Transport Mechanism Type
CWM43FR34 (JN331)


SPECIFICATIONS
Amplifier section CD player section Tuner section
CX-JN331 System Compact disc and digital FM stereo, FM/AM superheterodyne tuner
The following measured at AC 120, 127, 220, 240 V audio system FM tuner section
50/60 Hz Laser Diode Properties Emission duration: Tuning range 87.5 - 108.0 MHz
DIN power output (rated): 48 + 48 watts (6 ohms at continuous (50-kHz step)
1 kHz, DIN) Laser Output: Less than Antenna FM lead antenna
Continuous RMS power output (reference): 44.6 µW Antenna terminals 75 ohms unbalanced
60 + 60 watts (6 ohms at (This output is the value Intermediate frequency 10.7 MHz
1 kHz, 10% THD) measurement at a distance
AM tuner section
of 200 mm from the
objective lens surface on Tuning range
CX-JPK331
the Optical Pick-up Block 2 Band type: 530 - 1,710 kHz
The following measured at AC 120, 127, 220, 240 V (with the tuning interval
with 7 mm aperture)
50/60 Hz set at 10 kHz)
Frequency response 2 Hz - 20 kHz (±0.5 dB)
DIN power output (rated): 48 + 48 watts (6 ohms at 531 - 1,602 kHz
Signal-to-noise ratio More than 90 dB
1 kHz, DIN) (with the tuning interval
Dynamic range More than 90 dB
Continuous RMS power output (reference): set at 9 kHz)
60 + 60 watts (6 ohms at Antenna AM loop antenna
Tape deck section
1 kHz, 10% THD) Antenna terminals External antenna terminal
Recording system 4-track 2-channel, stereo
Intermediate frequency 450 kHz
Inputs Frequency response 50 - 13,000 Hz (±3 dB),
VIDEO/MD IN (phono jacks): using Sony TYPE I
voltage 450/250 mV, cassettes
impedance 47 kilohms Wow and flutter ±0.15% W. Peak (IEC)
MIC (phone jack) chilean and peruvian model 0.1% W. RM S (NAB) ­ Continued on next page ­
sensitivity 1 mV, ±0.2% W. Peak (DIN)
impedance 10 kilohms
Outputs
PHONES (stereo mini jack):
accepts headphones of

SPEAKER:
8 ohms or more
accepts impedance of 6 to
16 ohms
COMPACT DISC DECK RECEIVER
CX-JN331/JPK331



General Notes on chip component replacement
Power requirements · Never reuse a disconnected chip component.
Mexican models: 127 V AC, 60 Hz · Notice that the minus side of a tantalum capacitor may be
Other models: 120 V, 22 0 V or damaged by heat.
230 - 240 V AC, 50/60 Hz
Adjustable with voltage
selector
Flexible Circuit Board Repairing
Power consumption 110 watts · Keep the temperature of the soldering iron around 270 °C
during repairing.
Dimensions (w/h/d) incl. projecting parts and controls · Do not touch the soldering iron on the same conductor of the
Amplifier/Tuner/Tape /CD section: circuit board (within 3 times).
Approx. 280 × 325 × · Be careful not to apply force on the conductor when soldering
425 mm
Mass Approx. 8.3 kg
or unsoldering.

Design and specifications are subject to change
without notice.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.


This appliance is classified as a CLASS 1
LASER product.
This label is located on the rear exterior.




SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.


2
CX-JN331/JPK331



TABLE OF CONTENTS

1. SERVICING NOTES ............................................... 4 8. EXPLODED VIEWS
8-1. Case Section .................................................................... 56
2. GENERAL ................................................................... 7 8-2. Tape Mechanism Deck Section
(CWM43FF13: JPK331)/(CWM43FR34: JN331) .......... 57
3. DISASSEMBLY 8-3. Panel Board Section ........................................................ 58
3-1. Disassembly Flow ........................................................... 9 8-4. Cassette Box Section ....................................................... 59
3-2. Case (Side-L/R) ............................................................... 10 8-5. Front Panel Section ......................................................... 60
3-3. Case (Top) ....................................................................... 10 8-6. Back Panel Section .......................................................... 61
3-4. Tray Panel ........................................................................ 11 8-7. Chassis Section ................................................................ 62
3-5. CD Mechanism Deck (CDM74KS-F1BD81C) ............... 11 8-8. CD Mechanism deck Section-1
3-6. Front Pack Block ............................................................. 12 (CDM74KS-F1BD81C) .................................................. 63
3-7. Back Panel Section ......................................................... 12 8-9. CD Mechanism deck Section-2
3-8. MAIN Board .................................................................... 13 (CDM74KS-F1BD81C) .................................................. 64
3-9. Tape Mechanism Deck 8-10. CD Mechanism deck Section-3
(CWM43FF13: JPK331)/(CWM43FR34: JN331) .......... 13 (CDM74KS-F1BD81C) .................................................. 65
3-10. Table Assy ....................................................................... 14 8-11. Base Unit (BU-F1BD81C) .............................................. 66
3-11 MOTOR (TB) Board ...................................................... 14
3-12 MOTOR (LD) Board ...................................................... 15 9. ELECTRICAL PARTS LIST ................................ 67
3-13 Base Unit (BU-F1BD81C) .............................................. 15
3-14 Motor Gear Assy (Sled) (M102), CD BOARD ............. 16
3-15 Optical Pick-up (KSM-215DCP) .................................... 16

4. TEST MODE .............................................................. 17

5. MECHANICAL ADJUSTMENTS ....................... 21

6. ELECTRICAL ADJUSTMENTS ......................... 21

7. DIAGRAMS
7-1. Block Diagram - SERVO Section - .............................. 24
7-2. Block Diagram - MAIN Section - ................................ 25
7-3. Block Diagram
- PANEL/POWER SUPPLY Section - ........................... 26
7-4. Printed Wiring Board - CD Board - ............................. 28
7-5. Schematic Diagram - CD Board - ................................. 29
7-6. Printed Wiring Boards - CHANGER Section - ........... 30
7-7. Schematic Diagram - CHANGER Section - ................. 31
7-8. Printed Wiring Board
- CDMP3 CONNECT Board - ....................................... 32
7-9. Schematic Diagram
- CDMP3 CONNECT Board - ....................................... 33
7-10. Schematic Diagram - MAIN Section (1/4) - ................ 34
7-11. Schematic Diagram - MAIN Section (2/4) - ................ 35
7-12. Schematic Diagram - MAIN Section (3/4) - ................ 36
7-13. Schematic Diagram - MAIN Section (4/4) - ................ 37
7-14. Printed Wiring Boards - MAIN Section - ..................... 38
7-15. Printed Wiring Boards - PANEL Section - ................... 39
7-16. Schematic Diagram - PANEL Section (1/2) - ............... 40
7-17. Schematic Diagram - PANEL Section (2/2) - ............... 41
7-18. Printed Wiring Board - POWER AMP Section - .......... 42
7-19. Schematic Diagram - POWER AMP Section - ............. 43
7-20. Printed Wiring Boards - TRANS Section - ................... 44
7-21. Schematic Diagram - TRANS Section - ....................... 45




3
CX-JN331/JPK331
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP · MODEL IDENTIFICATION
BLOCK OR BASE UNIT ­ Rear View ­

The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
PART No.

NOTES ON LASER DIODE EMISSION CHECK R L R L



The laser beam on this model is concentrated so as to be focused on + +


­ ­
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
MODEL PART No.
CX-JPK331: Mexican model 4-252-231-2[]
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK CX-JN331/JPK331: Chilean and Peruvian models 4-252-231-3[]
Carry out the "S curve check" in "CD section adjustment" and check
that the S curve waveforms is output three times.


UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)

: LEAD FREE MARK
Unleaded solder has the following characteristics.
· Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
· Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
· Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.




4
CX-JN331/JPK331



HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH TURNS OFF.


1 Remove the case (side-L).

2 Turn the loading gear in the direction
of arrow A.




A
3 Pull-out the disc tray.




SERVICE POSITION
­ CD MECHANISM DECK ­


CD mechanism deck




stand




CDMP3 CONNECT board




5
CX-JN331/JPK331



­ FRONT PANEL SECTION ­




MAIN board




PANEL board
front panel section




tape mechanism deck




­ AMP BOARD ­




front panel section


SUB TRANS board
AMP board




TRANS board




MAIN board




6
CX-JN331/JPK331
SECTION 2 This section is extracted from
GENERAL instruction manual.

· LOCATION OF CONTROLS


Main unit
ALPHABETICAL ORDER BUTTON DESCRIPTIONS

A­N O­Z ?/1 (power) 1
Z PUSH (deck A) (eject) 0
ALBUM + wk Operation Dial
Z (eject) wg
ALBUM - wk (AMS/TUNING) qf
P FILE 6 PUSH Z (deck B) (eject) wj
BASS control 5
PHONES jack qa m (rewind) wk
CD qh
PLAY MODE w; x (stop) wk
CD SYNC qs
PRESET EQ 3 H or hH 1) (play) wk
Deck A 9
REC PAUSE /START 8 X (pause) wk
Deck B wl
Remote sensor 7 M (fast forward) wk
DISC 1 - 3 wd
DISC SKIP/EX-CHANGE wf SURROUND wa
1)
Disc tray ws TAPE A/B qk CX-JN331 only
2)
DISPLAY qg TREBLE control 5 CX-JPK331 chilean and
Display window 4 TUNER/BAND qj peruvian model only
ENTER 2 TUNING MODE w;
i-Bass qd VIDEO/MD ql
MIC jack2) e; VOLUME control wh
MIC LEVEL2) e;
MIDDLE control 5


1234 5 6 7 qh qj qk qlw;waws




qg wd
qf -- + -- +
wf
Z Z


qd -- + -- + -- + -- + -- + -- + wg
qs -- + -- + wh
qa
wj
0
wk
9 wl
e;

8




7
CX-JN331/JPK331




Remote control
ALPHABETICAL ORDER BUTTON DESCRIPTIONS

A­E F­Z ?/1 (power) 1
ALBUM + qa FM MODE 4 m/M (rewind/fast forward)
ALBUM - qd 7
FUNCTION 6
CD qk N (play) 8
PLAY MODE w;
CLEAR qg X (pause) 8
REPEAT 4
CLOCK/TIMER SELECT 2 x (stop) 8
SLEEP ws
CLOCK/TIMER SET 3 -/+ (tuning) qh
TAPE qj
DISC SKIP 0 ./> (go back/go forward)
TUNER BAND 5
DISPLAY wa qh
TUNER MEMORY ql
ENTER 9 TUNING MODE w;
EQ qf VOLUME +/- qs




ws 1
wa 2
w; 3
ql 4
qk 5
qj 6
qh 7
8
qg 9
qf q;

qd qa
qs




8
CX-JN331/JPK331
SECTION 3
DISASSEMBLY
· This set can be disassembled in the order shown below.

3-1. DISASSEMBLY FLOW



Note 1: The process described in can be performed in any order.
Note 2: Without completing the process described in , the next process can not be performed.




SET




3-2. CASE
(SIDE-L/R)
(Page 10)



3-3. CASE (TOP) 3-4. TRAY PANEL
(Page 10) (Page 11)



3-5. CD MECHANISM DECK
(CDM74KS-F1BD81C)
(Page 11)


3-6. FRONT PANEL 3-7. BACK PANEL 3-10. TABLE ASSY 3-13. BASE UNIT
BLOCK SECTION (Page 14) (BU-F1BD81C)
(Page 12) (Page 12) (Page 15)


3-9. TAPE
MECHANISM
DECK
(CWM43FF13: JPK331)/
(CWM43FR34: JN331)
(Page 13)



3-8. MAIN BOARD 3-11. MOTOR (TB) 3-14. MOTOR GEAR ASSY (SLED) (M102),
(Page 13) BOARD CD BOARD
(Page 14) (Page 16)
3-12. MOTOR (LD)
BOARD
(Page 15) 3-15. OPTICAL PICK-UP
(KSM-215DCP)
(Page 16)




9
CX-JN331/JPK331


Note: Follow the disassembly procedure in the numerical order given.

3-2. CASE (SIDE-L/R)



1 two screws
(case 3 TP2) 3 two screws
(BVTP3 × 10)




7 case (side-R)

2 screw
(case 3 TP2)




4 case (side-L)




6 two screws
(BVTP3 × 10)




5 three screws
(case 3 TP2)



3-3. CASE (TOP)




2 three claws 1 two screws
(BVTP3 × 10)

3 case (top)




10
CX-JN331/JPK331



3-4. TRAY PANEL



four claws
3 Remove the tray panel
1 Turn the loading gear in the direction of arrow C.
in the direction of arrow A.



A

C




B 2 Pull-out the tray in the direction
of arrow B.




3-5. CD MECHANISM DECK
(CDM74KS-F1BD81C)
7 CD mechanism deck
(CDM74KS-F1BD81C)




6 two connectors
(CN701, CN874)
5 wire (flat type) (17 core)
(CN873)


2 screw
3 three screws
(BVTP3 × 10)
4 (BVTP3 × 10)




1 screw
(BVTP3 × 10)


11
CX-JN331/JPK331



3-6. FRONT PANEL BLOCK 2 connector
(CN112)


1 wire (flat type) (29 core) 2 connector
(CN302) (CN324)

2 connector
6 front panel block
(CN103)



3 screw
(BVTP3 × 8)




4 harness




2 connector
(CN309)

5 three screws
(BVTP3 × 8)



3-7. BACK PANEL SECTION

4 duct cover



9 back panel section
8 SUB TRANS board

3 two screws
(BVTP3 × 10)
7 two screws
(BVTP3 × 10)

2 connector
(CN901)




1 wire (flat type) (15 core)
(CN101)
5 three screws
(BVTP3 × 10)




2 two connectors
(CN904, 906)
6 two screws
(BVTP3 × 8)




12
CX-JN331/JPK331



3-8. MAIN BOARD




1 connector
(CN907) 4 MAIN board




3 connector
(CN307)




2 two screws
(BVTP3 × 8)




3-9. TAPE MECHANISM DECK
(CWM43FF13: JPK331)/
(CWM43FR34: JN331)




1 six screws
(BVTP2.6 × 8)




2 tape mechanism deck
(CWM43FF13: JPK331)/
(CWM43FR34: JN331)




13
CX-JN331/JPK331



3-10. TABLE ASSY



5 two claws




A

4 hook
3 wire (flat type) (5 core)
(CN702)

2 Pull-out the table assy. 1 Turn the loading gear
6 table assy in the direction of arrow A.




3-11. MOTOR (TB) BOARD

1 screw
(PTPWH M2.6)

2 tray




3 belt (table)




6 MOTOR (TB) board
4 connector
(CN731)




5 two screws
(BTTP M2.6)




14
CX-JN331/JPK331



3-12. MOTOR (LD) BOARD




3 two screws
(BTTP M2.6)
4 MOTOR (LD) board




2 connector
(CN704)
1 belt (loading)




3-13. BASE UNIT (BU-F1BD81C)




5 base unit
(BU-F1BD81C)

1 wire (flat type) (27 core)
(CN201)



4 four insulators


3 four coil springs
(insulator)
2 four floating screws
(PTPWHM2.6)




15
CX-JN331/JPK331



3-14. MOTOR GEAR ASSY (SLED) (M102), CD BOARD

7 gear (A)




6 claw




2 two screws 8 gear (B)
(P2 × 3)




5 wire (flat type) (16 core)
(CN101)

qa CD board



0 motor gear assy (SLED)
(M102)
1 Remove two
solders.



4 3 screw (2.6 × 8)

9 Remove two solders.




3-15. OPTICAL PICK-UP (KSM-215DCP)



3 Remove the optical pick-up
(KSM-215DCP) in the direction
of arrow B.




B




A
2 sled shaft




1 Slide the lever
in the direction of arrow A.




16
CX-JN331/JPK331
SECTION 4
TEST MODE
MC COLD RESET CD TRAY LOCK MODE
· The cold reset clears all data including preset data stored in · This mode is used to unable to take sample disc out of tray in
the RAM to initial conditions. Execute this mode when the shop.
returning the set to the customer. Procedure:
Procedure: 1. Press the I/1 button to turn the power ON.
1. Press the I/1 button to turn the power ON. 2. Press the [CD] button to select "CD".
2. Press three buttons of x , [P FILE] and [DISC 1] simultaneously. 3. Set disc on the CD tray, press two buttons of x and Z for 5
3. The message "COLD RESET" is displayed on the fluorescent seconds.
indicator tube momentarily, then becomes standby states. 4. The message "LOCKED" is displayed on the fluorescent
indicator tube and the CD tray is locked. (Even if pressing
TUNER STEP CHANGE-OVER the Z button, the message "LOCKED" is displayed on the
· A step of AM channels can be changed over between 9 kHz fluorescent indicator tube and the CD tray is locked)
and 10 kHz. 5. To release from this mode, press two buttons of x and Z for
Procedure: 5 seconds.
1. Press the I/1 button to turn the power ON. 6. The message "UNLOCKED" is displayed on the fluorescent
2. Press the [TUNER/BAND] button to select "AM". indicator tube and the CD tray is unlocked.
3. Press the I/1 button to turn the power OFF.
4. Press two buttons of [PLAY MODE/TUNING MODE] and I/1 AMP TEST MODE
simultaneously. · This mode is used to display the parameter of amplifier IC
5. The message "AM 9K STEP" or "AM 10K STEP" is displayed and display the VACS status.
on the fluorescent indicator tube, and thus the channel step is Procedure:
changed over. 1. Press the I/1 button to turn the power ON.
2. Press three buttons of x , [P FILE] and [PLAY MODE/TUNING
CD SHIP (LOCK) MODE MODE] simultaneously.
· This mode moves the optical pick-up to the position durable 3. When the AMP test mode is activated, the message "AMP
to vibration. Use this mode when returning the set to the TEST IN" is displayed on the fluorescent indicator tube
customer after repair. momentarily, then amplifier adjustment mode is displayed on
Procedure: the fluorescent indicator tube.
1. Press the I/1 button to turn the power ON. 4. Press the [DISPLAY] button to changed over between VACS
2. Press the [CD] button to select "CD". status display mode and the amplifier IC parameter display
3. Press two buttons of [CD] and [POWER] simultaneously. mode.
4. The message "LOCK" is displayed on the fluorescent indicator 5. In the amplifier IC parameter display mode, press the [i-BASS]
tube, and the CD ship mode is set. button to changed over DBFB ON/OFF, and when it is ON,
the character "D" is displayed on the fluorescent indicator tube.
CD SHIP (LOCK) MODE & COLD RESET 6. In the amplifier IC parameter display mode, press the
· This mode is used to perform CD chip (lock) mode and cold [SURROUND] button to changed over surround ON/OFF, and
reset simultaneously. when it is ON, the character "S" is displayed on the fluorescent
Procedure: indicator tube.
1. Press the I/1 button to turn the power ON. 7. In the amplifier IC parameter display mode, turn each knob of
2. Press the [CD] button to select "CD". [BASS], [MIDDLE] and [TREBLE] causes respective parameters
3. Press three buttons of x , [CD] and [DISPLAY] simultaneously. to be changed, as well as change-over of the display on the
4. The message "COLD RESET" is displayed on the fluorescent fluorescent indicator tube.
indicator tube momentarily, then becomes standby states.

CHANGE-OVER FUNCTION OF MD/VIDEO
· This mode is used to enable function of external input to change
over between MD and VIDEO.
Procedure:
1. Press the I/1 button to turn the power ON.
2. Press two buttons of VIDEO (MD) and I/1 simultaneously.
3. The message "MD" or "VIDEO"is displayed on the fluorescent
indicator tube, and the function of external input is changed
over.




17
CX-JN331/JPK331



AGING MODE 3. Tape Deck Section
· This mode can be used for operation check of CD section and The sequence during the aging mode is following as below.
tape deck section. If an error occurred, stop display that step.
CD section and tape deck section work in parallel.
If an error occurred: Aging mode sequence (tape deck section) :
The aging operation stops only an error occurred sections and
display then status.
If no error occurs: Rewind the tape A and B
The aging operation continues repeatedly. "TAPE AAG-1 or TAPE BAG-2"
Procedure:
Shut off
1. Press the I/1 button to turn the power ON.
2. Press the [CD] button to select "CD". FWD play the tape A
3. Set disc on the CD tray and set tape into the deck. "TAPE AAG-3"
4. Press three buttons of x , [P FILE] and [DISC SKIP/EX-
CHANGE] simultaneously. 2 minutes
5. Aging operations of CD and tape are started at the same time.
6. To release from this mode, press the I/1 button to turn the Rewind the tape A
power OFF and press the function buttons. "TAPE AAG-6"

Shut off
1. Display at the Aging Mode
Display operating state of CD section and tape deck section FWD play the tape B
alternately. "TAPE BAG-3"
If an error occurred, stop display which that section.
2 minutes
2. CD Section
Rewind the tape B
The sequence during the aging mode is following as below. "TAPE BAG-6"
Display at the aging mode is the same as the normal operation.
Shut off
Aging mode sequence (CD section) :

Start (from disc 1) Note: "TAPE *AG-*" is display of each step.

PANEL TEST MODE
Disc chucking · This mode is used to check the fluorescent indicator tube, LEDs
and buttons.
Procedure:
TOC read 1. Press the I/1 button to turn the power ON.
2. Press three buttons of x , [P FILE] and [ENTER] simultaneously.
3. Fluorescent indicator tube and LEDs are all turned ON.
Play first track for 2 seconds 4. Press two buttons of X and [ENTER] simultaneously, mode
is changed over.
Play last track for 2 seconds 5. In the key check mode, press each key, the defined key number
of every each key list is displayed on the fluorescent indicator
tube.
EX-change open/close 6. In the key count check mode, "KEYCNT 0" is displayed on
the fluorescent indicator tube. Each time a key is pressed, "K"
value increases. However, once a key is pressed, it is no longer
Open the disc tray taken into account.
7. In the headphone input check mode, connect the headphone,
Disc skip the message "H_P ON" is displayed on the fluorescent
indicator tube, and disconnect the headphone, the message
"H_P OFF" is displayed on the fluorescent indicator tube.
Close the tray 8. In the volume check mode, "VOLUME FLAT" is displayed
on the fluorescent indicator tube. Turn the [VOLUME] knob
clockwise, the message "VOLUME UP" is displayed on the
Change the next disc. fluorescent indicator tube momentarily and turn the [VOLUME]
knob counterclockwise, the message "VOLUME DOWN" is
displayed on the fluorescent indicator tube momentarily.




18
CX-JN331/JPK331



MC TEST MODE 1. Mechanism Deck Error Code Mode
· This mode is used to check operations of microprocessor. · When this mode is entered, mechanism deck error code is
Procedure: displayed with the 10-character format on the fluorescent
1. Press the I/1 button to turn the power ON. indicator tube.
2. Press three buttons of x , [P FILE] and [DISC 3] simultaneously.
3. When the MC test mode is activated, VACS level is displayed The first digit from the left indicates:
on the fluorescent indicator tube momentarily. The first digit from the left indicates which mode the error history
4. Turn the [AMS/TUNING] knob clockwise, the message "ALL is. In the mechanism deck error code mode, "M" is displayed on
EQ MAX" is displayed on the fluorescent indicator tube the fluorescent indicator tube.
momentarily and turn the [AMS/TUNING] knob
counterclockwise, the message "ALL EQ MIN" is displayed The second digit from the left indicates:
on the fluorescent indicator tube momentarily. (Error history No. display)
5. Press the [PRESET EQ] button, the message "ALL EQ FLAT" The second digit from the left indicates which order the error history
is displayed on the fluorescent indicator tube momentarily. is. "1" indicates the latest error history, and each time the number
6. Turn the [VOLUME] knob clockwise, the message "VOLUME increases by one, the error history goes back to one-previous error.
MAX" is displayed on the fluorescent indicator tube
momentarily and turn the [VOLUME] knob counterclockwise, The third and 4th digit from the left indicates:
the message "VOLUME MIN" is displayed on the fluorescent (Error status display)
indicator tube momentarily. The third and 4th digit from the left indicates which error status is
7. Press the [i-BASS] button to changed over VACS ON/OFF. indicated.
8. When the [REC PAUSE/START] button is pressed twice with a
tape set in the deck-B, the function is switched "MD" or Display Status
"VIDEO" and recording starts. When the m or M button 0 0 No error
is pressed during recording, the tape is rewound back to the 0 8 Table operation time-out (Table does not move to the target
beginning of recording, the function is switched to "TAPE position within the specified time)
B", then playback starts.
1 6 In the chucking down operation, the operation was retried
9. When the [CD SYNC] key is pressed with the test tape (AMS-
by the maximum number of times but the operation could
100, AMS-110A) in the deck, number of space between tunes
is counted, then if AMS-110A is set, "OK" is displayed on the not be completed
fluorescent indicator tube and if AMS-100 is set, "NG" is 1 7 In the chucking up and down operation, the reverse
displayed on the fluorescent indicator tube. recovery processing was attempted but it could not be
10. Press the I/1 button to release from this mode, then cold reset recovered
is performed. 1 8 In the chucking up operation, the operation was retried by
the maximum number of times but the operation could not
VERSION DISPLAY MODE be completed
· This mode is used to check the model, destination and software 2 0 Loading operation time-out (Table does not move to the
version.
target position within the specified time)
Procedure:
1. Press the I/1 button to turn the power ON. 2 2 As the chuck was in the ex-open status at the initialization,
2. Press three buttons of x , [P FILE] and [DISC 2] simultaneously. the closing was attempted but could not be completed
3. When this mode is activated, model and destination is displayed
on the fluorescent indicator tube. The 5th and 6th digit from the left indicates:
4. Press the [DISPLAY] button to changed over between software (Present status display)
version and year, month, day of the software creation display The 5th and 6th digit from the left indicates which operating status
mode and model and destination display mode. when an error occurred is indicated.
5. To release from this mode, press three buttons of x , [P FILE]
and [DISC 2] simultaneously. Display Status
0 1 Open completion status
CD ERROR CODE DISPLAY MODE 0 2 From open status, the movement to chucking down position
· This mode can be used for error code display of CD section. is under way
Procedure: 0 3 From chucking down position, the open operation is under
1. Press the I/1 button to turn the power ON. way
2. Press the [CD] key to select "CD". 0 4 Chucking down completion status
3. Press three buttons of x , [CD] and [DISC 1] simultaneously.
1 0 The chucking down operation is under way
4. When this mode is activated, mechanism deck error code is
displayed on the fluorescent indicator tube. 1 1 The chucking up operation is under way
5. Press the [i-BASS] button to changed over between optical pick- 1 2 Close completion status
up error code display mode and mechanism deck error code 1 3 From close status, the ex-open operation is under way
mode. 1 4 From ex-open status, the close operation is under way
6. Turn the [AMS/TUNING] knob to change over display of error 1 8 Ex-pen completion status
history.




19
CX-JN331/JPK331



The 7th and 8th digit from the left indicates: The 5th and 6th digit from the left indicates:
(Motor status display) (Error step display)
The 7th and 8th digit from the left indicates which motor output The 5th and 6th digit from the left indicates which processing when
status when an error occurred is indicated. a trouble occurred

Display Status Display Contents
× 0 No table motor output 0 1 Power OFF in progress
× 1 Table motor forward output 0 2 Initialize in progress
× 2 Table motor backward output 0 3 Oscillation stopping
× 3 Table motor break output 0 4 From oscillation stop, oscillation starting
0 × No loading motor output 0 5 Stopping
1 × Loading motor forward output 0 6 Stop operation is under way
2 × Loading motor backward output 0 7 Start operation in progress
3 × Loading motor break output 0 8 TOC read in progress
0 9 Search operation is under way
The 9th and 10 th digit from the left indicates: 0 A Playback operation is under way
(Tray status display) 0 B Pause operation is under way
The 9th and 10th digit from the left indicates which target processing 0 C Playback manual search operation is under way
when an error occurred is indicated.
0 D Pause manual search operation is under way
0 E -
Display Status
0 1 Open operation
The 7th and 8th digit from the left indicates:
1 2 Close operation
The 7th and 8th digit from the left indicates which operation in
1 8 Ex-open operation progress when a trouble occurred. (Step of each processing of the
5th and 6th digits is indicated)
2. Optical Pick-up Error Code Mode
· When this mode is entered, optical pick-up error code is 5 REPEAT LIMIT CANCEL MODE
displayed with the 8-character format on the fluorescent · Number of repeat for CD playback is 5 times when the repeat
indicator tube. mode is "REPEAT". This mode is used to enables CD to repeat
playback for limitless times.
The first digit from the left indicates: Procedure:
The first digit from the left indicates which mode the error history 1. Press the I/1 button to turn the power ON.
is. In the optical pick-up error code mode, "D" is displayed on the 2. Press the [CD] button to select "CD".
fluorescent indicator tube. 3. Press three buttons of x , [CD] and [ENTER] simultaneously.
4. The message "LIMIT OFF" is displayed on the fluorescent
The second digit from the left indicates: indicator tube momentarily, CD repeat 5 limit is cancelled.
(Error history No. display)
The second digit from the left indicates which order the error history
is. "1" indicates the latest error history, and each time the number
increases by one, the error history goes back to one-previous error.

The third and 4th digit from the left indicates:
(Error status display)
The third and 4th digit from the left indicates which error status is
indicated.

Display Status
0 1 Not focused (TOC read without a disc)
0 2 GFS NG (TOC read with a disc chucked)
0 3 Start operation time-over
0 4 Defocused continuously (Defocused during TOC reading)
0 5 Q code not entered for specified time
0 6 Tracking not turned ON
0 7 Blank disc (Blank disc TOC read)




20
CX-JN331/JPK331
SECTION 5 SECTION 6
MECHANICAL ADJUSTMENTS ELECTRICAL ADJUSTMENTS
PRECAUTION DECK SECTION 0 dB = 0.775 V
1. Clean the following parts with a denatured alcohol-moistened
swab: 1. Demagnetize the record/playback head with a head
record/playback heads pinch rollers demagnetizer.
erase head rubber belts 2. Do not use a magnetized screwdriver for the adjustments.
capstan idlers 3. After the adjustments, apply suitable locking compound to
2. Demagnetize the record/playback head with a head de- the parts adjust.
magnetizer.
3. Do not use a magnetized screwdriver for the adjustments. · Test Tape
4. After the adjustments, apply suitable locking compound to
Tape Signal Used for
the parts adjusted.
P-4-A100 10 kHz, -10 dB Azimuth Adjustment
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.

TORQUE MEASUREMENT RECORD/PLAYBACK HEAD AZIMUTH ADJUST-
MENT
Mode Torque meter Meter reading
DECK A DECK B
3.06 N · m to 6.96 N · m
FWD FCQ-102C 31 to 71 g · cm Note: Perform this adjustments for both decks
(0.43 ­ 0.98 oz · inch) Procedure:
0.19 N · m to 0.58 N · m 1. Mode: Playback
FWD
CQ-102C 2 to 6 g · cm
back tension
(0.02 ­ 0.08 oz · inch) test tape MAIN board
3.06 N · m to 6.96 N · m P-4-A100 CN309
REV CQ-102RC 31 to 71 g · cm (10 kHz, -10 dB) Pin 5 (L-CH)
Pin 3 (R-CH) level meter
(0.43 ­ 0.98 oz · inch)
0.19 N · m to 0.58 N · m set
REV +
CQ-102RC 2 to 6 g · cm
back tension ­
(0.02 ­ 0.08 oz · inch)
MAIN board
6.96 N · m to 14.02 N · m CN309
FF/REW CQ-201B 71 to 143 g ·