Sony HCD-DX80 User manual

SERVICE MANUAL
MINI HI-FI COMPONENT SYSTEM
E Model
SPECIFICATIONS
HCD-DX80
Ver 1.1 2001.11
9-929-593-12 Sony Corporation
2001K0500-1 Home Audio Company
C2001.11 Published by Sony Engineering Corporation
Model Name Using Similar Mechanism HCD-DX50
CD CD Mechanism Type CDM58E-30BD60
Section Base Unit Name BU-30BD60
Optical Pick-up Name A-MAX.3
Tape deck Model Name Using Similar Mechanism NEW
Section Tape Transport Mechanism Type TCM-230AWR41
– Continued on next page –
• HCD-DX80 is the tuner, deck, CD and
amplifier section in MHC-DX80.

2
HCD-DX80
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED
LINE WITH MARK 0ON 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 PUB-
LISHED BY SONY.
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of soldering iron around 270˚C
during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static 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.
NOTES ON LASER DIODE EMISSION CHECK
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 emis-
sion, observe from more than 30 cm away from the objective lens.

3
HCD-DX80
MODEL IDENTIFICATION
— BACK PANEL —
MODEL
BR, E2, E51, SP, AR models
MX model
PARTS No.
4-231-580-4s
4-231-580-5s
• Abbreviation
AR : Argentina model
BR : Brazilian model
E2 : 120 V AC Area in E model
E51 : Chilean and Peruvian model
SP : Singapore model
MX : Mexican model
PARTS No.
TABLE OF CONTENTS
1. GENERAL ................................................................... 4
2. DISASSEMBLY ......................................................... 7
2-1. Disassembly Flow ........................................................... 7
2-2. Case (Top) ....................................................................... 8
2-3. Loading Panel.................................................................. 8
2-4. CD Mechanism Deck (CDM58E-30BD60) ................... 9
2-5. Front Panel Section ......................................................... 9
2-6. Tape Mechanism Deck (TCM-230AWR41)................... 10
2-7. Back Panel Section.......................................................... 10
2-8. Main Board...................................................................... 11
2-9. LEAF SW Board, HEAD (A) Board,
HEAD (B) Board ............................................................ 11
2-10. Base Unit (BU-30BD60) ................................................ 12
2-11. DRIVER Board, MOTOR Board, SENSOR Board ....... 12
3. TEST MODE ............................................................... 13
4. MECHANICAL ADJUSTMENTS ........................ 15
5. ELECTRICAL ADJUSTMENTS.......................... 15
6. DIAGRAMS
6-1. Block Diagram –TUNER/CD Section –......................... 21
6-2. Block Diagram –MAIN Section – .................................. 22
6-3. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 23
6-4. Schematic Diagram –BD Board – .................................. 24
6-5. Printed Wiring Board –BD Board – ............................... 25
6-6. Schematic Diagram –MAIN Board (1/4) – .................... 26
6-7. Schematic Diagram –MAIN Board (2/4) – .................... 27
6-8. Schematic Diagram –MAIN(3/4)/HEAD Board –......... 28
6-9. Schematic Diagram –MAIN Board (4/4) – .................... 29
6-10. Printed Wiring Board –MAIN Board – .......................... 30
6-11. Schematic Diagram
–POWERAMP/SENSOR Board – ................................. 32
6-12. Printed Wiring Boards
–POWERAMP/SENSOR Board – ................................. 33
6-13. Schematic Diagram
–PANEL/VIDEO SWITCH Board – .............................. 34
6-14. Printed Wiring Boards
–PANEL/VIDEO SWITCH Board – .............................. 35
6-15. Schematic Diagram
–CD SWITCH/PAD SWITCH Board – ......................... 36
6-16. Printed Wiring Boards
–CD SWITCH/PAD SWITCH Board – ......................... 37
6-17. Schematic Diagram –LEAF SW Board – ....................... 38
6-18. Printed Wiring Boards –LEAF SW/HEAD Board – ...... 39
6-19. Schematic Diagram
–ADDRESS SENSOR/DRIVER/MOTOR Board – ...... 40
6-20. Printed Wiring Boards
–ADDRESS SENSOR/DRIVER/5MOTOR Board – .... 41
6-21. Schematic Diagram
–MAIN TRANS/SUB TRANS Board – ........................ 42
6-22. Printed Wiring Boards
–MAIN TRANS/SUB TRANS Board –......................... 43
6-23. IC Pin Function Description ........................................... 47
7. EXPLODEDVIEWS
7-1. Cabinet Section ............................................................... 52
7-2. Front Panel Section ......................................................... 53
7-3. Main Board Section ........................................................ 54
7-4. CD Mechanism Deck Section (CDM58E-30BD60) ...... 55
7-5. Base Unit Section (BU-30BD60) ................................... 56
7-6. Tape Mechanism Deck Section-1 (TCM-230AWR41).... 57
7-7. Tape Mechanism Deck Section-2 (TCM-230AWR41).... 58
8. ELECTRICAL PARTS LIST.................................. 59

4
HCD-DX80 SECTION 1
GENERAL This section is extracted from
instruction manual.

5
HCD-DX80

6
HCD-DX80

7
HCD-DX80
• This set can be disassembled in the order shown below.
2-1. DISASSEMBLY FLOW
SECTION 2
DISASSEMBLY
2-4. CD MECHANISM DECK
(CDM58E-30BD60)
(Page 9)
2-3. LOADING PANEL
(Page 8)
2-2. CASE (TOP)
(Page 8)
2-5. FRONT PANEL SECTION
(Page 9)
2-7. BACK PANEL SECTION
(Page 10)
2-8. MAIN BOARD
(Page 11)
2-6. TAPE MECHANISM DECK
(TCM-230AER41)
(Page 10)
2-11. DRIVER BOARD,
MOTOR BOARD,
ADDRESS SENSOR BOARD
(Page 12)
2-10. BASE UNIT (BU-30BD60)
(Page 12)
2-9. LEAF SW BOARD,
HEAD (A) BOARD,
HEAD (B) BOARD
(Page 11)
SET

8
HCD-DX80
Note: Follow the disassembly procedure in the numerical order given.
2-2. CASE (TOP)
q;
q;
5
two screws (case 3 TP2)
7 two screws
(+BVTP 3
× 10)
3 two screws
(+BVTP 3
× 10)
1 two screws (case 3 TP2
)
6 screw (case 3TP2)
8 side panel (L)
4 side panel (R)
2 screw (case 3 TP2)
9 four screws
(+BVTP 3
× 12)
qa case (Top)
2-3. LOADING PANEL
2 Pull-out the disc tray.
3 loading panel
1 Turn the pulley in the direction of the arrow.
Front panel side
CD mechanism deck (CDM58E-30BD60)
–BOTTOM VIEW–

9
HCD-DX80
9
6
two screws
(+BVTP 3
× 10 )
7 screws (+BVTP 3 × 10 )
8 Screws
(+BVTP 3
× 10)
5 screw
(+BVTP 3
× 10)
2 wire (flat type)
(17 core)
(CN304)
3 connector ( CN1)
4 connector ( CN2)
0 front panel section
1 connector ( CN607)
2-4. CD MECHANISM DECK (CDM58E-30BD60)
2-5. FRONT PANEL SECTION
4 screw (+BVTP 3 × 10)
1 wire (flat type)
(21 core) (CN201)
3 screw
(+BVTP 3 × 10 )
2 connector
( CN202)
5 CD mechanism deck
(CDM58E-30BD60)

10
HCD-DX80
2-6. TAPE MECHANISM DECK (TCM-230AWR41)
2 Tape mechanism deck
(TCM-230AWR41)
1 five screws
(+BVTP 2.6
× 8
)
2-7. BACK PANEL SECTION
4 five screws
(+BVTP 3
× 10)
5 two screws
(+BVTP 3
× 10
)
1 connector (CN973)
2 connector (CN505)
6 back panel section
3 connector (CN891)

11
HCD-DX80
2-8. MAIN BOARD
2-9. LEAF SW BOARD, HEAD (A) BOARD, HEAD (B) BOARD
1 two screws (+BVTP 3 × 10)
2 MAIN board
MAIN board
6 screw (+PTT 2 × 4)
4 screw (+PTT 2 × 4)
3 LEAF SW board
2 five claws
5 head (A) board
7 head (B) board
1 Remove the four solderings.

12
HCD-DX80
2-10. BASE UNIT (BU-30BD60)
2-11. DRIVER BOARD, MOTOR BOARD, ADDRESS SENSOR BOARD
qa
9 two screws (+PTPWH M2.6)
1 screw (+PTPWH M2.6)
q; screws (DIA. 12)
7 two screws (+BVTP 2.6 × 8)
6 BD board
5 rivet
qs two insulators (BU-30)
2 holder assy
qs two insulators (BU-30)
8 two stoppers (BU)
4 wire (flat type)
(16 core)
(CN102)
qd base unit
(BU-30BD60)
3 wire (flat type)
(21 core)
(CN101)
qa Pull-out the disc tray.
6 two screws (+BVTP 2.6 × 8)
qs screw (+PTPWH 2.6 × 8)
qd tray
1 s crew (+BVTP 2.6 × 8)
qf screw (+BVTP 2.6 × 8)
7
0
MOTOR board
qg ADDRESS SENSOR board
4 driver board
2
5 Remove the two solderings of motor.
9 connector
3 wire (flat type)
(8 core)
(CN702)
8 wire (flat type)
(8 core)
(CN721)

13
HCD-DX80
SECTION 3
TEST MODE
[Cold Reset]
• The cold reset clears all data including preset data stored in the
RAM to initial conditions. Execute this mode when returning
the set to the customer.
Procedure:
1. Press three buttons x, ENTER , and ?/1simultaneously.
2. The fluorescent indicator tube becomes blank instantaneously,
and the set is reset.
[Hot Reset]
• This mode resets the set with the preset data kept stored in the
memory. The hot reset mode functions same as if the power
cord is plugged in and out.
Procedure:
1. Press three buttons x, ENTER , and DISPLAY
simultaneously.
2. The fluorescent indicator tube becomes blank instantaneously,
and the set is reset.
[Tuner Step Change]
• A step ofAM channels can be changed over between 9 kHz and
10 kHz.
Procedure:
1. Press ?/1button to turn the set ON.
2. Select thefunction “TUNER”, and press TUNER/BAND button
to select the BAND “AM”.
3. Press ?/1button to turn the set OFF.
4. Press ENTER and ?/1buttonssimultaneously, and the display
of fluorescent indicator tube changes to “AM 9 k STEP” or
“AM 10 k STEP”, and thus the channel step is changed over.
[Function Change Mode]
• Select either VIDEO or MD of the external FUNCTION input.
Procedure:
1. Turn on the power.
2. Hold down MD (VIDEO) button then press ?/1 button , and
release ?/1button first in order not to switch off the set
immediately.
The another function of the previous function is selected , the
input level is also changed and displayed “ MD ” or “VIDEO”.
[GCTest Mode]
• This mode is used to check the software version, FL tube, LED,
keyboard and VACS.
Procedure:
1. Press three buttons x, ENTER ,and DISC 2 simultaneously.
2. LEDs and fluorescent indicator tube are all turned on.
3. When you want to enter the software version display mode,
press DISC 1. The model numberand destination aredisplayed.
4. Each time DISC 1 is pressed, the display changes starting
from MC version, GC version, CD version, CDD version,CDM
version, BD version, ST version, TC version, TA version and
TM version in this order, and returns to the model number and
destination display.
5. When DISC 3 is pressed while the version numbers are being
displayed except model number and destination, year, month
and day of the software creation appear. When DISC 3 is
pressedagain, the display returns to thesoftware versiondisplay.
When DISC 1 is pressed while year, month and day of the
software creation are being displayed, the year, month and day
of creation of the software versions are displayed in the same
order of version display.
6. Press DISC 2 button, and the key check mode is activated.
7. In the key check mode, the fluorescent indicator tube displays
“K0V0”. Eachtime a button is pressed, “KEY”value increases.
However, once a button is pressed, it is no longer taken into
account.
“VOL” value increases like 1, 2, 3 ... if rotating VOLUME
knob in “+” direction, or it decreases like 0, 9, 8 ... if rotating in
“–” direction.
8. Also when DISC 3 is pressed after lighting of all LEDs and FL
tubes, value of VACS appears.
9. To exit from this mode, press three buttons in the same manner
as step 1, or disconnect the power cord.
[MCTest Mode]
• This mode is used to check operations of the respective sections
of Amplifier, Tuner, and Tape.
Procedure:
* To enter MC Test Mode
1. Press the ?/1button to turn on the set.
2. Press the three buttons of x, ENTER and DISC 3
simultaneously.
3. The messages MUSIC, MOVIE, GAME and P FILE flash on
the FL display tube.
The input FUNCTION is Changed to VIDEO.
* Check of Amplifier
1. When v(CURSOR UP) button is pressed, GEQ increases to
its maximum and a message “GEQ MAX” appears.
2. When V(CURSOR DOWN) button is pressed, GEQ decreases
to its minimum and a message “GEQ MIN” appears.
3. When b(CURSOR LEFT) or B(CURSOR RIGHT) button
is pressed, GEQ is set to flat and a message “GEQ FLAT”
appears.
4. When the VOLUME control knob is turned clockwise even
slightly, the sound volume increases to its maximum and a
message “VOLUME MAX” appears for two seconds, then the
display returns to the original display.
5. When the VOLUME control knob is turned counter-clockwise
even slightly, the sound volume decreases to its minimum and a
message “VOLUME MIN” appears for two seconds, then the
display returns to the original display.
* Check of clock frequency
1. To check the frequency of clock used to run the time in the unit,
the clock output is available at pin 39 (IC 501, MASTER
CONTROL) only during MC test mode.
2. The frequency is 32.768 kHz or so.
* Tuner function
1. In the test mode, the default-preset channel is called even when
the TUNER is selected and an attempt is made to call the preset
channel that has been stored in memory. (It means that the
memory is cleared.)
2. The minimum, center and maximum frequency of each band is
set then.

14
HCD-DX80
[CD Ship Mode (Memory Clear) ]
• This mode moves the pickup to the position durable to vibra-
tion. Use this mode when returning the set to the customer after
repair.
Procedure:
1. Press ?/1button to turn the set ON.
2. Press three buttons x, ENTER and GAME simultaneously.
3. After the "STANDBY" display blinks six times, a message
“LOCK” is displayed on the fluorescent indicator tube, and the
CD ship mode is set.
[CD Ship Mode (No Memory Clear) ]
• This mode moves the pickup to the position durable to vibra-
tion. Use this mode when returning the set to the customer after
repair.
Procedure:
1. Press ?/1button to turn the set ON.
2. Press CD button and ?/1button simultaneously.
3. After the "STANDBY" display blinks six times, a message
“LOCK” is displayed on the fluorescent indicator tube, and the
CD ship mode is set.
* Tape function
1. When a tape is inserted in Deck B and recording is started, the
input source function selects VIDEO automatically.
When CD SYNC/HI-DUB button is pressed during Rec in
function, ALC is turned on.
2. When xbutton is pressed to stop recording, the Tape (Deck)
B is selected and tape is rewound, tape is rewound using m
button, tape is stops at around the record-starting position and
playback of the recordedportionofthe tape isstarted. IfPAUSE
is inserted even once during recording, tape is rewound to the
position around the PAUSE position and is played back.
3. When CD SYNC / HI-DUB button is pressed during playback
of Deck B, either normal speed or high speed can be selected
by this button.
* AMS Test Mode
1. Set TAPE function
2. Select the desired loop by pressing the PLAY MODE button.
Insert a test tape AMS-110A or AMS-120 to Deck A.
3. Press the SPECTRUM button to enter theAMS test mode.
4. After a tape is rewound first, the FFAMS is checked, and the
mechanism is shut off after detecting theAMS signal twice.
5. Then the REWAMS is checked and the mechanism is shut off
after detecting the AMS signal twice.
6. When the check is complete, a message of either OK or NG
appears.
* To return to normal mode again.
1. When you want to exit this mode, press the ?/1button.
2. The cold reset is enforced at the same time.
[VACS ON/OFF Mode]
• This mode is used to switch ON and OFF the VACS (Variable
Attenuation Control System).
Procedure:
Press the ENTER and SPECTRUM buttons simultaneously. The
message “VACS OFF” or “VACS ON” appears.
[CD Service Mode]
• This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pickup.
Procedure:
1. Press ?/1button to turn the set ON.
2. Select the function “CD”.
3. Press three buttons x, ENTER , and OPEN/CLOSE simul-
taneously.
4. The CD service mode is selected.
5. With the CD in stop status, press M button to move the pickup
to outside track, or press m button to inside track.
6. To exit from this mode, perform as follows:
1) Move the pickup to the most inside track.
2) Press ?/1button to turn the set OFF.
Note: • Always move the pickup to most inside track when exiting from
this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can be
chipped.
+
–

15
HCD-DX80
SECTION 4
MECHANICAL ADJUSTMENTS SECTION 5 ELECTRICAL ADJUSTMENTS
0 dB=0.775 V
DECK SECTION
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless otherwise
specified.
• Test Tape
Record/Playback Head Azimuth Adjustment
Tape Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
WS-48B 3 kHz, 0 dB Tape Speed Adjustment
P-4-L300J 315 Hz, 0 dB Level Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
set
main board
CN301
Pin
3 (L-CH)
Pin
1 (R-CH)
main board
CN301
Pin
2 (GND)
+
–
level mete
r
test tape
P-4-A100
(10 kHz, –10 dB)
3.06 N •m to 6.96 N •m
31 to 71 g •cm
(0.43 –0.98 oz •inch)
0.19 N •m to 0.58 N •m
2 to 6 g •cm
(0.02 –0.08 oz •inch)
3.06 N •m to 6.96 N •m
31 to 71 g •cm
(0.43 –0.98 oz •inch)
0.19 N •m to 0.58 N •m
2 to 6 g •cm
(0.02 –0.08 oz •inch)
6.96 N •m to 14.02 N •m
71 to 143 g •cm
(0.98 –1.99 oz •inch)
9.80 N •m
100 g or more
(3.53 oz or more)
9.80 N •m
100 g or more
(3.53 oz or more)
Mode Torque meter
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Meter reading
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension

16
HCD-DX80
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
3. Mode: Playback
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
Tape Speed Adjustment DECK B
Note: Start the Tape Speed adjustment as below after setting to the test
mode.
In the test mode, the tape speed is high during pressing the
CD SYNC/HI-DUB button.
Procedure:
1. Turn the power switch on.
2. Press the xbutton, ENTER button and DISC 3 button
simultaneously.
(The “TEST MODE”on the fluorescent indicator tube display
while in the test mode.)
To exit from the test mode, press the ?/1button.
Mode: Playback
1. Insert the WS-48B into the deck B.
2. Press the gG button on the deck B.
3. Press the CD SYNC/HI-DUB button in playback mode.
Then at HIGH speed mode.
4. Adjust RV1001 on the LEAF SW board so that frequency
counter reads 6,000 ±30 Hz.
5. Press the CD SYNC/HI-DUB button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000 ±15 Hz.
Adjustment Location: LEAF SW board
Playback level Adjustment DECK A DECK B
Procedure:
Mode: Playback
1. Confirm that level difference between the channels is with ±
0.5 dB.
2. After check, adjust the following RVs.
Deck A is RV302 (L-CH), Deck B is RV303 (L-CH) so that
adjustment within adjustment level as follows.
Adjustment Level:
CN301 PB level: 334.4 to 748.7 mV (–7.3 to –0.3 dB)
Adjustment Location: MAIN board
Sample Volue of Wow and Flutter: 0.3% or less W. RMS
(WS-48B)
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak R-CH
peak
within
1dB
Screw
position
R-CH
peak
MAIN
board
CN301
set
test tape
P-4-A100
(10 kHz, –10 dB)
pin
1
oscilloscop
e
L-CH
R-CH
VH
waveform of oscilloscope
in phase 45 ° 90 ° 135 ° 180 °
good wrong
pin 2
pin 3
L
R
+
–
set
test tape
WS-48B
(3 kHz, 0 dB)
main board
CN301 (Pin
3 : L-CH)
(Pin
1 : R-CH)
frequency counter
+
–
set
test tape
P-4-L300J
(315 Hz, 0 dB)
main board
CN301 (Pin
3 : L-CH)
(Pin
1 : R-CH)
level meter
forward
reverse

17
HCD-DX80
4. Mode: Record
5. Mode: Playback
6. Confirm the play back signal recorded in step 3 becomes
adjustable level as follows.
If these levels are not adjustable level, adjust the RV301 (L-
CH) and RV351 (R-CH) on the MAIN board to repeat steps 4
and 5.
Adjustable level:
CN301 PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
[MAIN BOARD] (Component Side)
[LEAF SW BOARD] (Component Side)
REC Bias Adjustment DECK B
Procedure:
In the MC test mode, the “REC memory mode”is convenient for
this adjustment. In the “REC memory mode”, when the REC starts
the input signal FUNCTION is switched to VIDEO automatically.
When the REC stops, the tape returns near to the recording start
position.
1. Press MD (VIDEO) button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
3. After press REC PAUSE/START button, press REC PAUSE/
START button, then recording start.
4. Mode: Record
5. Mode: Playback
6. Confirm the playback signal recorded in step 3 becomes
adjustable level as follows.
If these levels are not adjustable level, adjust the RV304 (L-
CH) and RV354 (R-CH) on the MAIN board to repeat steps 4
and 5.
Adjustable level: Playback output of 315 Hz to playback output
of 10 kHz: ±1.0 dB
Adjustment Location: MAIN board
REC Level Adjustment DECK B
Procedure:
In the MC test mode, the “REC memory mode”is convenient for
this adjustment. In the “REC memory mode”, when the REC starts
the input signal FUNCTION is switched to VIDEO automatically.
When the REC stops, the tape returns near to the recording start
position.
1. Press MD (VIDEO) button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
3. After press REC PAUSE/START button, press REC PAUSE/
START button, then recording start.
attenuator
set
MD/VIDEO (AUDIO) IN (J101)
1) 315 Hz
2) 10 kHz 50 mV (–23.8 dB)



600 Ω
blank tape
CN-123
AF OSC
+
–
set
recorded
portion
CN301 (Pin
3 : L-CH)
(Pin
1 : R-CH)
level mete
r
set
MD/VIDEO (AUDIO) IN (J101)
315 Hz, 50 mV (–23.8 dB) blank tape
CS-123
600
Ω
attenuator
AF OSC
+
–
set
recorded
portion
CN301 (Pin
3 : L-CH)
(Pin
1 : R-CH)
level meter
TAPE SPEED
RV1002 RV1001
(NORMAL) (HIGH)
CN1001
         
T11
RV11
CN301
RV301
RV302
RV353
RV303
RV351 RV304 RV354
NO303
CN304
RV352
31
REC LEVEL (L)
(B)
PB LEVEL (L)
(A)
PB LEVEL (L)
(B)
REC LEVEL (R)
(B) REC BIAS (R)
(B)
REC BIAS (L)
(B)

18
HCD-DX80
FMTuned Level Adjustment
Procedure:
1. Supply a 98 MHz signal at 28dB from theANTENNAterminal.
2. Tune the set to 98 MHz.
3. Adjust RV11tothe point (moment) when the TUNED indicator
will change from going off to going on.
Adjustment Location: MAIN board
Null Adjustment
Procedure:
1. Supply a 98 MHz signal at 60dB from theANTENNAterminal.
2. Tune the set to 98 MHz.
3. Measure voltage between pin 22 and pin 3 of IC11. Adjust
T11 until the voltage becomes 0V.
Adjustment Location: MAIN board
Adjustment Location
[MAIN BOARD] (Component Side)
FM RF SIGNAL GENERATOR
75
Ω coaxial
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 28 dB (at 75
Ω open)
FM ANTENNA terminal
(TM1)
set
FM RF SIGNAL GENERATOR
75
Ω coaxial
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 60 dB (at 75
Ω open)
FM ANTENNA terminal
(TM1)
set
CD SECTION
Note :
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use LUV-P01 (4-999-032-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩimpedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
S-Curve Check
Procedure :
1. Connect an oscilloscope to TP (FEO).
2. Connect between TP (FEI) and TP (DVC) ( 1.65 V) by lead
wire.
3. Turn Power switch on.
4. Load a disc (LUV-P01) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
5. Confirm that the oscilloscope waveform (S-curve) is
symmetrical betweenA and B.And confirm peak to peak level
within 2 ±0.5 Vp-p.
6. After check, remove the lead wire connected in step 2.
Note : •Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.
•Take sweep time as long as possible and light up the
brightness to obtain best waveform.
RF Level Check
Procedure :
1. Connect an oscilloscope CH1 to TP (RFDC) and CH2 to TP
(RFAC).
2. Turn Power switch on.
3. Load a disc (LUV-P01) and playback.
4. Confirm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
BD board Oscilloscope
TP(FEO)
TP(DVC)
T11
RV11
CN301
RV301
RV302
RV353
RV303
RV351 RV304 RV354
NO303
CN304
RV352
31
NULL
FM TUNED LEVEL
TUNER SECTION
symmetry
S-curve waveform
within 2
± 0.5Vp-
p
A
B
TP(RFDC)
TP(RFAC)
BD board oscilloscope
TP(DVC)

19
HCD-DX80
Note : Clear RF signal waveform means that the shape “◊”can be clearly
distinguished at the center of the waveform.
E-F Balance (1Track jump) Check
Procedure :
1. Connect an oscilloscope to TP (TEO) and TP (DVC).
2. Turn Power switch on.
3. Load a disc (LUV-P01) and playback the number nine track.
4. Press the gG button. (Becomes the 1 track jump mode.)
5. Confirm that the level B andA (DC voltage) on the oscilloscope
waveform.
6. Adjust RV101 on the BD board so that the center of waveform
becomes the same voltage of DVC. (i.e. A=0V)
Adjustment Location:
[BD BOARD] (Conductor Side)
RF signal waveform VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 0.65
± 0.15Vp-p (RFDC)
1.1
± 0.4Vp-p (RFAC)
TP(TEO)
TP(DVC)
BD board oscilloscop
e
level=1.0 ± 0.5Vp-p symmetry
A (DC voltage
)
center of
waveform
B
DVC
1 track jump waveform
TP (TEO)
TP
(RFAC)
TP
(FEI) TP
(RFDC)
TP (FEO) IC101
IC103
RV101
TP (DVC)
1
15
30
1
2021
40
60
80
41
61
16

20
HCD-DX80
MEMO