Sony HCD-GPX5 Service Manual
HCD-GPX5
SERVICE MANUAL
Ver 1.0 2004.04
HCD-GPX5 is the amplifier, CD player, tape deck
and tuner section in CMT-GPX5.
CD
Section
Tape deck
Section
AEP Model
UK Model
Model Name Using Similar Mechanism NEW
CD Mechanism Type CDM80B-K6BD80A
Base Unit Name BU-K6BD80A
Optical Pick-up Block Name KSM-213DAP
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type CMAL1Z234A
Amplifier section
UK model:
DIN power output (rated): 40 + 40 W (6 ohms at 1
kHz, DIN)
Continuous RMS power output (reference):
50 + 50 W (6 ohms at 1
kHz, 10% THD)
Music power output (reference):
90 + 90 W
AEP model:
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)
Music power output (reference):
60 + 60 W
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.
SPECIFICATIONS
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 531 – 1,602 kHz
(with the tuning interval
set at 9 kHz)
Antenna AM loop antenna, external
Intermediate frequency 450 kHz
General
Power requirements 230 V AC, 50/60 Hz
Power consumption
UK model: 95 W
AEP model:
Dimensions (w/h/d) Approx. 181.5 × 261.5 ×
Mass Approx. 5.8 kg
Design and specifications are subject to change
without notice.
antenna terminal
0.25 W (in Power Saving
Mode)
80 W
0.25 W (in Power Saving
Mode)
357.5 mm incl. projecting
parts and controls
9-877-795-01 Sony Corporation
2004D05-1 Home Audio Company
© 2004.04 Published by Sony Engineering Corporation
COMPACT DISC DECK RECEIVER
HCD-GPX5
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.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIA GRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.
2
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.
TABLE OF CONTENTS
HCD-GPX5
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-K6BD80A)............................................. 12
3-9. Motor Gear Assy (Sled) (M102), BD Board.................. 12
3-10. Driver Board.................................................................... 13
3-11. Chassis (Top)................................................................... 13
3-12. Lever (Loading-L/R)....................................................... 14
3-13. Lever (Disc Sensor)/(Disc Stop) ..................................... 15
3-14. Holder (BU215) Assy ..................................................... 15
3-15. Lever (BU Lock)............................................................. 16
3-16. Close Lever ..................................................................... 16
3-17. Lever (Dir), Gear (IDL-B).............................................. 17
3-18. Gear (IDL-C)................................................................... 17
4. TEST MODE.............................................................. 18
7. EXPLODED VIEWS
7-1. Side Plates Section .......................................................... 48
7-2. Front Panel Section ......................................................... 49
7-3. Top Block Section ........................................................... 50
7-4. MAIN Section ................................................................. 51
7-5. Chassis Section ............................................................... 52
7-6. CD Mechanism Deck Section-1
(CDM80B-K6BD80A).................................................... 53
7-7. CD Mechanism Deck Section-2
(CDM80B-K6BD80A).................................................... 54
7-8. CD Mechanism Deck Section-3
(CDM80B-K6BD80A).................................................... 55
7-9. CD Mechanism Deck Section-4
(CDM80B-K6BD80A).................................................... 56
7-10. Base Unit Section (BU-K6BD80A) ............................... 57
8. ELECTRICAL PARTS LIST ............................... 58
5. ELECTRICAL ADJUSTMENTS
Deck Section ................................................................... 20
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 – BD Board – ............................. 26
6-6. Schematic Diagram – BD Board – ................................ 27
6-7. Printed Wiring Board – DRIVER Board – .................... 28
6-8. Schematic Diagram – DRIVER Board –....................... 28
6-9. Printed Wiring Board – CN Board – ............................. 29
6-10. Printed Wiring Board – MAIN Board – ........................ 30
6-11. Schematic Diagram – MAIN Board (1/3) – .................. 31
6-12. Schematic Diagram – MAIN Board (2/3) – .................. 32
6-13. Schematic Diagram – MAIN Board (3/3) – .................. 33
6-14. Printed Wiring Board – AMP Board – .......................... 34
6-15. Schematic Diagram – AMP Board – ............................. 35
6-16. Printed Wiring Board – PANEL (1) Board – ................ 36
6-17. Schematic Diagram – PANEL (1) Board – ................... 37
6-18. Printed Wiring Board – PANEL (2) Board – ................ 38
6-19. Schematic Diagram – PANEL (2) Board – ................... 39
6-20. Printed Wiring Board – POWER Board – ..................... 40
6-21. Schematic Diagram – POWER Board –........................ 41
3
HCD-GPX5
SECTION 1
SER VICING 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.
SERVICE POSITION
– TAPE MECHANISM DECK –
tape mechanism deck
4
– CD MECHANISM DECK –
HCD-GPX5
CD mechanism deck
– AMP BOARD –
1
two screws
(BVTP3
2
Remove the AMP board
from heat sink.
×
16)
heat sink
AMP board
heat sink
5
HCD-GPX5
12 3 56
w;q
wdwsw
q
qhq
4
• LOCATION OF CONTROLS
Main unit
ALPHABETICAL ORDER
A – O P – Z
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
SECTION 2
GENERAL
BUTTON DESCRIPTIONS
?/1 (power) 1
./> (CD skip back/skip
forward) w;
m/M (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
This section is extracted from
instruction manual.
ea
e;
wl
wk
wj
wh
wg
wf
?
/
1
mM
x
Y
7
8
9
0
qa
qs
qd
qf
qg
.>
N
Xx
Z
k
j
a
mM
l
6
HCD-GPX5
Remote control
ALPHABETICAL ORDER
A – O P – Z
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
ql
qk
qj
qh
qg
qf
w; 1
BUTTON DESCRIPTIONS
?/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
2
3
4
5
6
7
8
Setting the cl ock
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.
qd
9
qs
0
* This button is not available for this model.
*
7
HCD-GPX5
• This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
SET
3-2. SIDE PLATE
(L)/(R)
(Page 9)
3-3. TOP BLOCK
ASSY
(Page 9)
SECTION 3
DISASSEMBLY
3-5. FRONT PANEL
SECTION
(Page 10)
3-6. MAIN BOARD
(Page 11)
3-7. CD
MECHANISM
DECK BLOCK
(Page 11)
3-8. BASE UNIT
(BU-K6BD80A)
(Page 12)
3-14. HOLDER
(BU215) ASSY
(Page 15)
3-15. LEVER
(BU LOCK)
(Page 16)
3-4. TAPE MECHANISM DECK
(CMAL1Z234A)
(Page 10)
3-9. MOTOR GEAR
ASSY (SLED)
(M102),
BD BOARD
(Page 12)
3-10. DRIVER
BOARD
(Page 13)
3-11. CHASSIS (TOP)
(Page 13)
3-12. LEVER
(LOADING-L/R)
(Page 14)
3-13. LEVER (DISC
SENSOR)/
(DISC STOP )
(Page 15)
3-18. GEAR
(IDL-C)
(Page 17)
3-16. CLOSE
LEVER
(Page 16)
3-17. LEVER (DIR),
GEAR (IDL-B)
(Page 17)
8
Note: Follow the disassembly procedure in the numerical order given.
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)
3-2. SIDE PLATE (L)/(R)
HCD-GPX5
3-3. TOP BLOCK ASSY
2
4
Open the plate.
screw
(BVTT3
3
×
6)
harness
8
top block assy
6
wire (flat type)
(7 core) (CN302)
5
7
connector
(CN301)
1
screw
(BVTT3
×
8)
4
Open the plate.
9
HCD-GPX5
3-4. TAPE MECHANISM DECK
(CMAL1Z234A)
2
harness
3
tape mechanism deck (CMAL1Z234A)
1
four screws
(BVTP3 × 8)
3-5. FRONT PANEL SECTION
5
front panel section
1
wire (flat type)
(21 core) (CN310)
2
connector
(CN311)
10
4
Open the plate.
3
two screws
(BVTT3
4
Open the plate.
×
6)
3-6. MAIN BOARD
)
0
wire (flat type)
(15 core) (CN305)
0
wire (flat type) (27 core)
(CN304)
1
wire (flat type) (9 core)
(CN306)
qf
MAIN board
qa
connector (CN301)
(UK)
6
connector
(CN701)
4
2
three connectors
(CN603, 605, 901)
9
heat sink cover
HCD-GPX5
3
two screws
(BVTT3
7
three screws
(BVTP3
×
8)
×
10
qd
MAIN PWB bracket
qs
screw
×
(BVTT3
6)
3-7. CD MECHANISM DECK BLOCK
2
two screws
(BVTT3 × 6)
1
two screws
(BVTT3 × 6)
8
screw
(BVTT3
5
connector (CN201)
×
6)
3
CD mechanism deck block
11
HCD-GPX5
3-8. BASE UNIT (BU-K6BD80A)
3
CD mecha bracket (L)
2
two screws
(BVTT3
×
10)
qd
base unit (BU-K6BD80A)
5
CD mecha bracket (R)
block
4
two screws
(BVTP3
×
1
10)
wire (flat type) (17 core)
(CN702)
9
two insulators
8
two coil springs
(insulator)
7
two stoppers
(BU)
6
two screws
(BVTP M2.6)
3-9. MOTOR GEAR ASSY (SLED) (M102), BD BOARD
qs
two insulators
qa
two coil springs
(insulator)
0
two floating screws
(PTPWH M2.6)
12
4
BD board
1
Remove four solders.
3
screw (2.6 × 8)
2
wire (flat type) (16 core)
(CN101)
3-10. DRIVER BOARD
3
Remove two solders.
4
motor (pully) assy
(loading)
2
two screws
(BVTP 2.6
×
8)
5
DRIVER board
HCD-GPX5
3-11. CHASSIS (TOP)
3
two screws
(P 2
5
chassis (top)
4
three screws
(BVTP 2.6 × 8)
×
10)
1
belt (MOT)
1
screw
(BVTP 2.6
2
lever (CL UP2)
×
8)
13
HCD-GPX5
3-12. LEVER (LOADING-L/R)
5
lever (loading-R)
1
SPT-T (loading-R) SPT-T (loading-L)
4
two hooks
1
2
two hooks
3
lever (loading-L)
14
PRECAUTION DURING LEVER (LOADING R / L) INSTALLATION
– Bottom view –
Align the horizontal position.
lever (loading-L)
Install the
both levers so that they move symmetrically.
lever (loading-R)
3-13. LEVER (DISC SENSOR)/(DISC STOP)
1
gear (cap)
2
gear (IDL L)
HCD-GPX5
PRECAUTION DURING DISC STOP LEVER INSTALLATION
5
two hooks
6
lever (disc stop)
3-14. HOLDER (BU215) ASSY
3
two claws
4
lever (disc sensor)
hole
hole
Install the lever (disc stop) so that the both holes
are aligned.
1
screw
(BVTP 2.6
chassis (top)
lever (disc stop)
×
8)
5
213 down holder SPR-E
6
holder (BU215) assy
4
floating screw
(PTPWHM2.6)
3
floating screw
(PTPWHM2.6)
2
lever (CL UP2)
15
HCD-GPX5
3-15. LEVER (BU LOCK)
5
lever (BU lock)
2
gear (cap)
3
gear (BU lock)
1
floating screw
(PTPWH M2.6)
4
three hooks
3-16. CLOSE LEVER
3
claw
5
close lever
1
washer (3-1-0.4)
2
4
shaft disc stop
SPR-E lever close
16
3-17. LEVER (DIR), GEAR (IDL-B)
2
washer
1
DIR SPR-E
claw
0
lever (DIR)
3
nylon washer 1.7
4
pulley (gear)
5
gear (cap)
6
gear (IDL-A)
qa
gear (IDL-B)
HCD-GPX5
9
stoper
7
Loosen the screw.
8
Hold the release lever
and change the direction.
3-18. GEAR (IDL-C)
1
gear (IDL-F)
7
3
gear (IDL-D)
2
two claws
gear (IDL-C)
4
three hooks
5
gear loading lever
6
claw
17
HCD-GPX5
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] simultaneously.
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 clockwise, it displays “VOL MAX”, and if turn the knob counterclockwise, it displays “VOL MIN”.
2. If the [TREBLE] knobs are turned clockwise or counterclockwise, 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. To 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. To release from this mode, disconnect the AC plug to turn the
power off.
z
z
nN
[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 (TAPE), and [DSGX]
simultaneously.
3. When the panel test mode is activated, LEDs and segments 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.
18
HCD-GPX5
[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.
[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”.
[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) button, 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. To 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”.
19
HCD-GPX5
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:
digital voltmeter
(AC range)
MAIN board
TP101 (L), TP201 (R)
TP (GND)
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 (Conductor Side) –
z
REC BIAS ADJUSTMENT
(R-CH) (L-CH)
RV201 RV101
TP201 (R)
TP101 (L)
TP (GND)
20
CD SECTION
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
0.7
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
0.3 Vp-p
Note:
1. CD Block is basically constructed to operate without
adjustment.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10 MΩ 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.
5. Check the focus bias check when optical block is replaced.
FOCUS BIAS CHECK
oscilloscope
(DC range)
BD board
HCD-GPX5
TP012 (RFACO)
TP013 (VC)
+
–
Procedure :
1. Connect the oscilloscope to TP012 (RFA CO) and TP013 (VC)
on the BD board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the u CD button.
4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape (◊) in the
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
Checking Location:
– BD BOARD (Conductor Side) –
TP012
(RFACO)
TP013
(VC)
2121
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