Sony HCD-GPX6,HCD-GPX7 Service Manual
SERVICE MANUAL
COMPACT DISC DECK RECEIVER
US Model
Austr alian Model
HCD-GPX6
AEP Model
HCD-GPX7
E Model
HCD-GPX6/GPX7
HCD-GPX6/GPX7
Ver 1.0 2004.04
9-877-742-01 Sony Corporation
2004D05-1 Home Audio Company
© 2004.04 Published by Sony Engineering Corporation
SPECIFICATIONS
HCD-GPX6/GPX7 are the amplifier, CD player,
tape deck and tuner section in CMT -GPX6/GPX7.
Model Name Using Similar Mechanism NEW
CD
CD Mechanism Type CDM80B-F1BD81
Section
Base Unit Name BU-F1BD81A
Optical Pick-up Block Name KSM-215DCP
Tape deck
Model Name Using Similar Mechanism NEW
Section
Tape T ransport Mechanism T ype CMAL1Z234A
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
(The United States model only)
With 6 ohm loads, both channels driven, from
120-10,000 Hz; rated 35 watts per channel minimum
RMS power, with no more than 10% total harmonic
dist ortion from 250 milliwatts to rated output.
Amplifier section
HCD-GPX7
DIN power output (rated): 40 + 40 W (6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference): 60 + 60 W
(6 ohms at 1 kHz, 10% THD)
Music power output (reference): 100 + 100 W
HCD-GPX6
North American model:
Continuous RMS power output (reference): 40 + 40 W
(6 ohms at 1 kHz, 10% THD)
Other models:
The following measured at AC 240 V, AC 220 V or AC 120 V
DIN power output (rated): 30 + 30 W (6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference): 35 + 35 W
(6 ohms at 1 kHz, 10% THD)
Inputs
MD/VIDEO: Sensitivity 450/250 mV, impedance
47 kilohms
Outputs
PHONES: Accepts headphones with an
impedance of 8 ohms or more
SPEAKER: Accepts impedance of 6 to 16 ohms.
CD player section
Laser Semiconductor laser (λ=780 nm)
Emission duration: continuous
Frequency response 20 Hz − 20 kHz
Wavelength 780 − 790 nm
Tape deck section
Recording system 4-track 2-channel, stereo
Frequency response 50 − 13,000 Hz (±3 dB), using
Sony TYPE I cassettes
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 − 108.0 MHz
Antenna FM lead antenna
Antenna terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
Pan-American model: 530 − 1,710 kHz
(with the tuning interval set at 10 kHz)
531 − 1,710 kHz
(with the tuning interval set at 9 kHz)
European model: 531 − 1,602 kHz
(with the tuning interval set at 9 kHz)
Other models: 530 − 1,710 kHz
(with the tuning interval set at 10 kHz)
531 − 1,602 kHz
(with the tuning interval set at 9 kHz)
Antenna AM loop antenna, external
antenna terminal
Intermediate frequency 450 kHz
General
Power requirements
North American model: 120 V AC, 60 Hz
European model: 230 V AC, 50/60 Hz
Korean model: 220 V AC, 60 Hz
Australian model: 230 − 240 V AC, 50/60 Hz
Other models: 110 − 120 V or 220 − 240 V
AC, 50/60 Hz
Adjustable with voltage
Power consumption
HCD-GPX7: 105 W
0.25 W (in Power Saving Mode)
HCD-GPX6: 80 W
Dimensions (w/h/d) Approx. 181.5 × 261.5 × 357.5 mm
incl. projecting parts and controls
Mass
HCD-GPX7: Approx. 6.3 kg
HCD-GPX6: Approx. 5.8 kg
Design and specifications are subject to chang e without notice.
Argentina model: 220 V AC, 50 Hz
Photo: HCD-GPX7
HCD-GPX6/GPX7
2
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of the 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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation exposure.
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.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the leadfree 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.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
The A C leakage from an y exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT -540A. Follo w the manufacturers’ instructions to use these
instruments.
2. A battery-operated A C milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate lowvoltage scale. The Simpson 250 and Sanwa SH-63T rd are examples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V A C range are suitable. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k
Ω
0.15 µF
AC
voltmete
r
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
HCD-GPX6/GPX7
3
TABLE OF CONTENTS
1. SERVICING NOTES ................................................ 4
2. GENERAL
Location of Controls ....................................................... 6
3. DISASSEMBLY
3-1. Disassembly Flow ........................................................... 8
3-2. Side Plate (L)/(R) ............................................................ 9
3-3. Top Block Assy ............................................................... 9
3-4. Tape Mechanism Deck (CMAL1Z234A)....................... 10
3-5. Front Panel Section ......................................................... 10
3-6. MAIN Board ................................................................... 11
3-7. CD Mechanism Deck Block ........................................... 11
3-8. Base Unit (BU-F1BD81A) ............................................. 12
3-9. Motor Gear Assy (Sled) (M102), CD Board .................. 12
3-10. Optical Pick-up (KSM-215DCP).................................... 13
3-11. Chassis (Top)................................................................... 13
3-12. Lever (Loading-L/R)....................................................... 14
3-13. Lever (Disc Sensor)/(Disc Stop)..................................... 15
3-14. Driver Board.................................................................... 15
3-15. Holder (BU215) Assy ..................................................... 16
3-16. Lever (BU Lock) ............................................................. 16
3-17. Close Lever ..................................................................... 17
3-18. (Lever Dir), Gear (IDL-B) .............................................. 17
3-19. Gear (IDL-C)................................................................... 18
4. TEST MODE.............................................................. 19
5. ELECTRICAL ADJUSTMENTS
Deck Section ................................................................... 21
CD Section ...................................................................... 21
6. DIAGRAMS
6-1. Block Diagram – CD SERVO Section – ....................... 22
6-2. Block Diagram – MAIN Section – ................................ 23
6-3. Block Diagram
– PANEL/POWER SUPPLY Section – .......................... 24
6-4. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 25
6-5. Printed Wiring Board – CD Board – ............................. 26
6-6. Schematic Diagram – CD Board – ................................ 27
6-7. Printed Wiring Board – DRIVER Board – .................... 28
6-8. Schematic Diagram – DRIVER Board – ....................... 29
6-9. Printed Wiring Board – MAIN Board – ........................ 30
6-10. Schematic Diagram – MAIN Board (1/3) – .................. 31
6-11. Schematic Diagram – MAIN Board (2/3) – .................. 32
6-12. Schematic Diagram – MAIN Board (3/3) – .................. 33
6-13. Printed Wiring Board – AMP Board – .......................... 34
6-14. Schematic Diagram – AMP Board – ............................. 35
6-15. Printed Wiring Board – PANEL (1) Board – ................ 36
6-16. Schematic Diagram – PANEL (1) Board – ................... 37
6-17. Printed Wiring Board – PANEL (2) Board – ................ 38
6-18. Schematic Diagram – PANEL (2) Board – ................... 39
6-19. Printed Wiring Board – POWER Board –..................... 40
6-20. Schematic Diagram – POWER Board –........................ 41
7. EXPLODED VIEWS
7-1. Side Plates Section .......................................................... 50
7-2. Front Panel Section ......................................................... 51
7-3. Top Block Section ........................................................... 52
7-4. MAIN Section ................................................................. 53
7-5. Chassis Section ............................................................... 54
7-6. CD Mechanism Deck Section-1 (CDM80B-F1BD81) .. 55
7-7. CD Mechanism Deck Section-2 (CDM80B-F1BD81) .. 56
7-8. CD Mechanism Deck Section-3 (CDM80B-F1BD81) .. 57
7-9. CD Mechanism Deck Section-4 (CDM80B-F1BD81) .. 58
7-10. Base Unit Section (BU-F1BD81A) ................................ 59
8. ELECTRICAL PARTS LIST ............................... 60
4
HCD-GPX6/GPX7
– Rear View –
Power requirement
indication
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
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.
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 emission, observe from more than 30 cm away from the objectiv e lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveforms is output three times.
• MODEL IDENTIFICATION
SERVICE POSITION
– TAPE MECHANISM DECK –
tape mechanism deck
MODEL Power requirement indication
US model AC: 120V 60Hz
AEP model AC: 230V - 50/60Hz
Hong Kong, Singapore AC: 120V/220V/230-240V
models - 50/60Hz
Argentina model AC: 220V - 50Hz
Korean model AC: 220V - 60Hz
Australian model AC: 230V-240V - 50/60Hz
5
HCD-GPX6/GPX7
2
Remove the AMP board
from heat sink.
AMP board
1
two screws
(BVTP3
×
6)
heat sink
heat sink
– AMP BOARD –
– CD MECHANISM DECK –
CD mechanism deck
6
HCD-GPX6/GPX7
Main unit
ALBUM +/– w;
BASS +/– wk
Cassette compartment 4
CD SYNCHRO 7
DIRECTION 6
Disc slot wf
DISPLAY ea
Display window 3
DSGX qs
FM MODE wh
FUNCTION e;
PHONES jack wd
PLAY MODE ws
Remote sensor 2
REPEAT wa
TREBLE +/– qd
TUNER/BAND qg
TUNER MEMORY wj
TUNING +/– wg
TUNING MODE qf
VOLUME qa
?/1 (power) 1
.m/M> (CD skip
back/skip forward, CD rewind/
fast forward) ql
m/M (tape rewind/fast
forward) wl
x (CD stop) qj
x (tape stop) 9
z REC PAUSE/START 8
CD/NX (play/pause) qk
TAPE/nN (play) 0
A (CD eject) qh
A PUSH EJECT (tape open/
close) 5
ALPHABETICAL ORDER
A – O P – Z
BUTTON DESCRIPTIONS
?
/
1
mM
Y
x
.m M>
N
Xx
Z
12 3 56
7
8
9
w; qlwdwswa qk
0
qs
qd
qf
qg
wf
wg
wh
wj
wk
wl
e;
ea
qh
qj
qa
4
SECTION 2
GENERAL
This section is extracted from
instruction manual.
• LOCATION OF CONTROLS
7
HCD-GPX6/GPX7
Use buttons on the remote for the operation.
1 Press ?/1 to turn on the system.
2 Press CLOCK/TIMER SET.
3 Press ./> repeatedly to set the
hour.
4 Press ENTER.
5 Press ./> repeatedly to set the
minute.
6 Press ENTER.
The clock starts working.
To adjust the clock
1
Press CLOCK/TIMER SET.
2
Press ./> until “CLOCK SET”
appears, then press ENTER.
3
Do the same procedures as step 3 to 6
above.
Note
The clock is not displayed in Power Saving Mode.
Setting the cl ock
Remote control
ALBUM +/– qa
CD qh
CLEAR qd
CLOCK/TIMER SELECT 2
CLOCK/TIMER SET 3
DISPLAY ql
ENTER 9
EQ qs
FM MODE 4
FUNCTION 6
PLAY MODE qk
REPEAT 4
SLEEP w;
TAPE qg
TUNER/BAND 5
TUNER MEMORY qj
TUNING MODE qk
VOLUME +/– 0
?/1 (power) 1
m/M (rewind/fast forward)
7
./> (skip back/skip
forward) qf
x (stop) 8
X (pause) 8
N (play) 8
+/– (tuning) qf
ALPHABETICAL ORDER
A – O P – Z
BUTTON DESCRIPTIONS
* This button is not available for this model.
4
5
6
7
8
9
w; 1
qa
qd
qs
ql
qk
qj
qh
qg
qf
0
3
2
*
CMT-GPX7/CMT-GPX6
HCD-GPX6/GPX7
8
• This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
SECTION 3
DISASSEMBLY
SET
3-2. SIDE PLATE
(L)/(R)
(Page 9)
3-7. CD
MECHANISM
DECK BLOCK
(Page 11)
3-15. HOLDER
(BU215) ASSY
(Page 16)
3-16. LEVER
(BU LOCK)
(Page 16)
3-17. CLOSE
LEVER
(Page 17)
3-18. LEVER (DIR),
GEAR (IDL-B)
(Page 17)
3-9. MOTOR GEAR
ASSY (SLED)
(M102),
CD BOARD
(Page 12)
3-10. OPTICAL PICK-UP
(KSM-215DCP)
(Page 13)
3-8. BASE UNIT
(BU-F1BD81A)
(Page 12)
3-11. CHASSIS (TOP)
(Page 13)
3-14. DRIVER
BOARD
(Page 15)
3-12. LEVER
(LOADING-L/R)
(Page 14)
3-13. LEVER (DISC
SENSOR)/
(DISC STOP )
(Page 15)
3-19. GEAR
(IDL-C)
(Page 18)
3-4. TAPE MECHANISM DECK
(CMAL1Z234A)
(Page 10)
3-5. FRONT PANEL
SECTION
(Page 10)
3-6. MAIN BOARD
(Page 11)
3-3. TOP BLOCK
ASSY
(Page 9)
HCD-GPX6/GPX7
9
3-3. TOP BLOCK ASSY
Note: Follow the disassembly procedure in the numerical order given.
3-2. SIDE PLATE (L)/(R)
q;
side plate (R)
7
two screws
(BVTT3
×
6)
4
two screws
(BVTT3
×
8)
5
side plate (L)
1
screw
(BVTP3
×
10)
2
two screws
(BVTT3
×
6)
3
screw
(BVTP3
×
10)
6
screw
(BVTP3
×
10)
8
screw
(BVTP3
×
10)
9
two screws
(BVTT3
×
8)
5
8
top block assy
7
connector
(CN301)
2
screw
(BVTT3
×
6)
6
wire (flat type)
(7 core) (CN302)
4
Open the plate.
3
harness
4
Open the plate.
1
screw
(BVTT3
×
8)
HCD-GPX6/GPX7
10
3-4. TAPE MECHANISM DECK
(CMAL1Z234A)
3-5. FRONT PANEL SECTION
2
harness
1
four screws
(BVTP3 × 8)
3
tape mechanism deck
(CMAL1Z234A)
5
front panel section
4
Open the plate.
3
two screws
(BVTT3
×
6)
1
wire (flat type)
(21 core) (CN310)
2
connector
(CN311)
4
Open the plate.
HCD-GPX6/GPX7
11
3-6. MAIN BOARD
3-7. CD MECHANISM DECK BLOCK
4
CD mechanism
deck block
2
two screws
(BVTT3 × 6)
3
two screws
(BVTT3 × 6)
1
wire (flat type)
(27 core) (CN201
)
0
wire (flat type) (27 core)
(CN304)
1
wire (flat type) (9 core)
(CN306)
8
screw
(BVTT3
×
6)
qs
MAIN board
9
4
heat sink cover
7
three screws
(BVTP3
×
10
)
3
two screws
(BVTT3
×
8)
qa
connector (CN301)
(US, AEP, Argentina)
2
connector (CN901)
5
connector (CN201)
2
two connectors
(CN603, 605)
6
connector
(CN701)
0
wire (flat type)
(15 core) (CN305)
HCD-GPX6/GPX7
12
3-8. BASE UNIT
(BU-F1BD81A)
qs
base unit (BU-F1BD81A)
3
two screws
(BVTP3
×
10)
1
two screws
(BVTT3
×
10)
4
CD mecha bracket (R)
2
CD mecha bracket (L)
7
two coil springs
(insulator)
8
two insulators
6
two stoppers
(BU)
5
two screws
(BVTP M2.6)
9
two floating screws
(PTPWH M2.6)
q;
two coil springs
(insulator)
qa
two insulators
1
Remove four solders.
4
CD board
2
wire (flat type) (16 core
)
(CN101)
3
screw (2.6 × 8)
3-9. MOTOR GEAR ASSY (SLED) (M102), CD BOARD
HCD-GPX6/GPX7
13
2
sled shaft
1
Slide the lever
in the direction of arrow
A
.
3
Remove the optical pick-up
(KSM-215DCP) in the directio
n
of arrow B.
A
B
3-10. OPTICAL PICK-UP (KSM-215DCP)
3-11. CHASSIS (TOP)
1
screw
(BVTP 2.6 × 8)
4
three screws
(BVTP 2.6 × 8)
3
two screws
(P 2 × 10)
5
chassis (top)
2
lever (CL UP2)
HCD-GPX6/GPX7
14
lever (loading-R)
Align the horizontal position.
lever (loading-L)
Install the
both levers so that they move symmetrically.
– Bottom view –
2
two hooks
4
two hooks
3
lever (loading-L)
5
lever (loading-R)
SPT-T (loading-R) SPT-T (loading-L)
1
1
PRECAUTION DURING LEVER (LOADING R / L) INSTALLATION
3-12. LEVER (LOADING-L/R)
HCD-GPX6/GPX7
15
3-13. LEVER (DISC SENSOR)/(DISC STOP)
chassis (top)
hole
Install the lever (disc stop) so that the both holes
are aligned.
hole
1
gear (cap)
3
two claws
5
two hooks
6
lever (disc stop)
lever (disc stop)
4
lever (disc sensor)
PRECAUTION DURING DISC STOP LEVER INSTALLATION
2
gear (IDL L)
3-14. DRIVER BOARD
3
Remove two solders.
2
two screws
(BVTP 2.6
×
8)
5
DRIVER boar
d
4
motor (pully) assy
(loading)
1
belt (MOT)
HCD-GPX6/GPX7
16
3-15. HOLDER (BU215) ASSY
5
213 down holder SPR-E
1
screw
(BVTP 2.6
×
8)
2
lever (CL UP2)
6
holder (BU215) assy
3
floating screw
(PTPWHM2.6)
4
floating screw
(PTPWHM2.6)
3-16. LEVER (BU LOCK)
4
three hooks
1
floating screw
(PTPWH M2.6)
5
lever (BU lock)
2
gear (cap)
3
gear (BU lock)
HCD-GPX6/GPX7
17
3-17. CLOSE LEVER
1
washer (3-1-0.4)
2
SPR-E lever close
4
shaft disc stop
5
close lever
3
claw
3-18. (LEVER DIR), GEAR (IDL-B)
4
pulley (gear)
3
nylon washer 1.7
2
claw
washer
0
lever (DIR)
6
gear (IDL-A)
qa
gear (IDL-B)
1
DIR SPR-E
9
stoper
7
Loosen the screw.
8
Hold the release lever
and change the direction.
5
gear (cap)
HCD-GPX6/GPX7
18
6
claw
1
gear (IDL-F)
5
gear loading lever
2
two claws
4
three hooks
3
gear (IDL-D)
7
gear (IDL-C)
3-19. GEAR (IDL-C)
19
HCD-GPX6/GPX7
SECTION 4
TEST MODE
[MC COLD RESET]
The cold reset clears all data including preset data stored in the
memory to initial conditions. Execute this mode when returning
the set to the customer.
Procedure:
1. In the standby status, press the I/1 button to turn the power
on.
2. Press three buttons of I/1 , x (CD), and [DSGX] simulta-
neously.
3. The set is reset, and become standby status.
[COMMON TEST MODE]
Enter The Common Test Mode
Procedure:
1. In the standby status, press the I/1 button to turn the power
on.
2. Press three buttons of [REPEAT], x (TAPE), and [DSGX]
simultaneously.
3. When the common test mode is activated, “SLEEP” and
“PLAY” icons are blink on the fluorescent indicator tube.
AMP Test
Procedure:
1. In the common test mode, if turn the [VOLUME] knob clock-
wise, it displays “VOL MAX”, and if turn the knob counterclockwise, it displays “VOL MIN”.
2. If the [TREBLE] knobs are turned clockwise or counterclock-
wise, it displays “TONE FLAT”.
3. If the [BASS] knobs are turned clockwise, it displays “TONE
MAX”, and if turn the knob counterclockwise, it displays
“TONE MIN”.
4. T o release from this mode, disconnect the AC plug to turn the
power off.
Tape T est
Procedure:
1. In the common test mode, insert a tape.
2. Input any audio signal from the [VIDEO/MD] jack (J301) on
the MAIN board.
3. Press the [ REC] button, and press the [ TAPE] button
to select the tape direction.
4. Press the [ REC] button again to start recording.
5. If press the m (TAPE) or M (TAPE) button, the tape is
returned to recording start point by cue or review operation,
and starts playback.
6. T o release from this mode, disconnect the AC plug to turn the
power off.
[PANEL TEST MODE]
Enter The Panel Test Mode
Procedure:
1. In the standby status, press the I/1 button to turn the power
on.
2. Press three buttons of [PLAY MODE], x (T APE), and [DSGX]
simultaneously.
3. When the panel test mode is activated, LEDs and se gments of
fluorescent indicator tube are all turned on.
Version Check
Procedure:
1. In the panel test mode (all LEDs and segments of fluorescent
indicator tube are turned on), press the [TUNING MODE] button.
2. Destination indication and model type indication are displayed
on the fluorescent indicator tube alternately.
3. From this status, each time the [TUNING MODE] button is
pressed, it changes the version display of each module cyclically as follows.
Display Module
MC Main controller
GC Display
CD CD system
CDD CD device master
CDMA CDM upper module
CDMB CDM lower module
BDA BD upper module
BDB BD lower module
ST Tuner
TA Amplifier
TM Timer
TC Tape
4. To date of any module, press the [DSGX] button.
5. To release from this mode, press three buttons of [PLAY
MODE], x (TAPE), and [DSGX] simultaneously.
Key Check
Procedure:
1. In the panel test mode (all LEDs and segments of fluorescent
indicator tube are turned on), press the [PLAY MODE] button.
2. It displays “K 0 J0 V0” on the fluorescent indicator tube.
3. Each time a button is pressed, “K” value increases. However,
once a button is pressed, it is no longer taken into account.
All keys are pressed, display becomes “K26”.
4. “V” value increases like 1, 2, 3 ... if turn the [VOLUME] knob
clockwise, or it decreases like 0, 9, 8 ... if turn the knob counterclockwise.
“J” value increases like 1, 2, 3 ... if turn the [BASS] or
[TREBLE] knob clockwise, or it decreases like 0, 9, 8 ... if
turn the knob counterclockwise.
5. To release from this mode, press three buttons of [PLAY
MODE], x (TAPE), and [DSGX] simultaneously.
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20
HCD-GPX6/GPX7
[CD REPEAT 5 LIMIT CANCEL MODE]
Number of repeat for CD playback is 5 times when the repeat
mode is “REPEA T”. This mode enables CD to repeat playback for
limitless times.
Procedure:
1. Press the I/1 button to turn the power on.
2. Press the [FUNCTION] button to select CD function.
3. Press three buttons of . m (CD), x (TAPE), and
[DSGX] simultaneously.
4. It enters the CD repeat 5 limit cancel mode and display “LIMIT
OFF”
5. To release this mode, press the I/1 button to turn the power
off.
[CD SHIP MODE]
This mode can run the CD sled motor optionally. Use this mode,
for instance, when cleaning the optical pick-up.
Procedure:
1. Press the I/1 button to turn the power on.
2. Press the [FUNCTION] button to select CD function.
3. Press three buttons of [TUNING MODE], x (CD),
and I/1 simultaneously. *1
4. Set to the CD ship mode. (chucking on)
5. After blink “STANDBY”, “LOCK” is displayed, disconnect
the AC plug.
*1) If press three buttons of [DIRECTION], u (CD), and
[DSGX] simultaneously, Activate the CD ship mode and
MC cold reset.
[CD SLOT LOCK]
This mode is for the antitheft of CD disc in shop. (not for transport)
Procedure:
1. Press the I/1 button to turn the power on.
2. Press the [FUNCTION] button to select CD function.
3. Insert a disc.
4. While pressing the x (CD) b utton, press the A (CD) button
for more 5 seconds.
5. The message “LOCKED” is displayed and the disc slot is
locked. (Even if exiting from this mode, the disc slot is still
locked)
6. If press the A (CD) button to eject the disc, the message
“LOCKED” is displayed and can not eject the disc.
7. T o release this lock, while pressing the x (CD) button, press
the A (CD) button for 5 seconds again.
8. The message “UNLOCKED” is displayed and the disc slot is
unlocked.
[CD POWER MANAGE]
This mode is for switch the CD power supply on/off. Even if this
state pulls out AC plug, it is held.
Procedure:
1. Press the I/1 button to turn the power on.
2. Press the [FUNCTION] button to select CD function.
3. Press the I/1 button again to turn the power off (standby).
4. While pressing the x (CD) button, press the I/1 button.
5. It turns power on and display “CD POWER”, then display
“ON” or “OFF”.
[CHANGE-OVER THE AM TUNING INTERVAL]
(EXCEPT AEP model)
The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:
1. Press the I/1 button to turn the power on.
2. Press the [BAND, TUNER] button to select TUNER (AM) function.
3. Press the I/1 button again to turn the power off (standby).
4. While pressing the [TUNING +] button, press the I/1 button.
5. It turns power on and display “STEP 9kHz” or “STEP 10kHz”,
and thus the tuning interval is changed over.
[MD/VIDEO FUNCTION CHANGE]
Select either VIDEO or MD of the external input.
Procedure:
1. Press the I/1 button to turn the power on.
2. Press the [FUNCTION] button to select MD or VIDEO function.
3. Press the I/1 button again to turn the power off (standby).
4. While pressing the [FUNCTION] button, press the I/1 button.
5. The another function of the previous function is selected and
display “MD” or “VIDEO”.
HCD-GPX6/GPX7
2121
SECTION 5
ELECTRICAL ADJUSTMENTS
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 for both L-CH and RCH.
6. Switches and controls should be set as follows unless otherwise specified.
REC BAIS ADJUSTMENT
Setting:
Procedure:
1. Connect a digital voltmeter (AC range) to TP101 (L), TP201
(R) and TP (GND) on the MAIN board.
2. Insert a tape.
3. Press the I/1 button to turn the power on, and press the
[FUNCTION] button to select TAPE function.
4. Press the [ REC] button twice to start recording.
5. Adjust RV101 (L-ch), RV201 (R-ch) on the MAIN board so
that the digital voltmeter reads AC 6.15 V.
6. Connect an oscilloscope or frequency counter to TP101 (L),
TP201 (R) and TP (GND) on the MAIN board.
7. Confirm that the frequency is 82 kHz ±3 kHz.
Adjustment Location:
MAIN board
digital voltmeter
(AC range)
TP101 (L), TP201 (R)
TP (GND)
– MAIN BOARD (Conductor Side) –
RV201 RV101
TP (GND)
REC BIAS ADJUSTMENT
(R-CH) (L-CH)
TP201 (R)
TP101 (L)
CD SECTION
Note:
1. CD Block is basically designed to operate without adjustment. Therefore,
check each item in order given.
2. Use YEDS-18 (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩ impedance.
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 (FE) and TP (VC) on the CD
board.
2. Press the I/1 button to turn the power ON.
3. Load a disc (YEDS-18) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
4. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak le v el
within 2.0 ± 0.5 Vp-p.
Note: • Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.
• Ta ke sweep time as long as possible and light up the
brightness to obtain best waveform.
Connecting Location: CD board
RFAC LEVEL CHECK
Procedure :
1. Connect an oscilloscope to TP (RFACO) and TP (VC) on the
CD board.
2. Press the I/1 button to turn the power ON.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check if RF AC
signal level is correct or not.
Note: Clear RFAC signal waveform means that the shape “ ◊ ” can be
clearly distinguished at the center of the waveform.
Connecting Location: CD board
CD board
Oscilloscope
TP(FE)
TP(VC)
symmetry
S-curve waveform
within 2.0
±
0.5 Vp-p
A
B
TP(RFACO)
CD board
oscilloscope
TP(VC)
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 0.7 ± 0.3 Vp-p
– CD BOARD (Conductor Side) –
TP
(VC)
TP
(FE)
TP
(RFACO)
IC101
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