Sony HCD-GP7, CMT-GP7 Schematic
HCD-GP7
SERVICE MANUAL
Ver 1.1 2003. 11
HCD-GP7 is the Amplifier, CD player, Tape
Deck and Tuner section in CMT-GP7.
Model Name Using Similar Mechanism NEW
CD
Section
TAPE
Section
CD Mechanism Type CDM55A-K6BD47S
Base Unit Name BU-K6BD71C
Optical Pick-up Name KSM-213D
Model Name Using Similar Mechanism HCD-EP515
Tape Transport Mechanism Type CMAL1Z240A
AEP Model
UK Model
Main unit
Amplifier section
DIN power output (rated): 40 + 40 watts (6 ohms at 1
kHz, DIN)
Continuous RMS power output (reference):
50 + 50 watts (6 ohms at 1
kHz, 10% THD)
Inputs
MD (VIDEO) (phono jacks):
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
SPECIFICATIONS
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
(50 kHz step)
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
antenna terminal
Intermediate frequency 450 kHz
MICRO HI-FI COMPONENT SYSTEM
General
Power requirements 230 V AC, 50/60 Hz
Power consumption 100 watts
0.3 watts (in Power Saving
Mode)
Dimensions (w/h/d) Approx. 190 × 250 × 340
mm incl. projecting parts
and controls
Mass Approx. 6.2 kg
Supplied accessories: Remote (1)
R6 (size AA) batteries (2)
AM loop antenna (1)
FM lead antenna (1)
Design and specifications are subject to change
without notice.
9-877-470-02
2003K16-1
© 2003.11
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
HCD-GP7
Ver 1.1 2003.11
TABLE OF CONTENTS
1. SERVICING NOTES ······················································· 3
2. GENERAL ·········································································· 5
3. DISASSEMBLY ································································ 7
3-1. Top Case, MAIN Board, Back Panel Assy ···················· 8
3-2. Front Panel Assy, CD Mechanism Deck ······················· 9
3-3. PANEL Board, HP Board, VOL Board ······················· 10
3-4. TC Board, single cassette mechanism
(CMAL1Z240A) ························································· 10
3-5. CD Mechanism (CDM55A-K6BD47S) ······················ 11
3-6. THR Board, DC FAN ·················································· 11
3-7. SPEAKER Board, POWER-AMP Board···················· 12
3-8. SUB-POWER Board, POWER Board························· 12
3-9. LOADING Board ························································ 13
3-10.CD Board ····································································· 13
3-11.Tray (CDM55D) ·························································· 14
3-12.Optical Pick-Up (KSM-213D) ···································· 14
4. TEST MODE···································································· 16
5. MECHANICAL ADJUSTMENTS ····························· 17
6. ELECTRICAL ADJUSTMENTS ······························· 17
7. DIAGRAMS······································································ 22
Contents
CIRCUIT BOARD LOCATION ·········································· 23
7-1. Block Diagram — CD Section — ······························· 24
— TUNER/TAPE Section — ······································ 25
— AMP Section — ····················································· 26
— DISPLAY/POWER SUPPLY Section — ··············· 27
7-2. Printed Wiring Board — CD Section — ····················· 28
7-3. Schematic Diagram — CD Section — ························ 29
7-4. Printed Wiring Board — TC Section —······················ 30
7-5. Schematic Diagram — TC Section — ························ 31
7-6. Printed Wiring Board — MAIN Section — ················ 32
7-7. Schematic Diagram — MAIN Section —··················· 33
7-8. Printed Wiring Board — PANEL Section — ·············· 34
7-9. Schematic Diagram — PANEL Section — ················· 35
7-10.Printed Wiring Board — POWER AMP Section — ··· 36
7-11.Schematic Diagram — POWER AMP Section — ······ 37
7-12.Printed Wiring Board — POWER Section — ·············38
7-13.Schematic Diagram — POWER Section — ··············· 38
8. EXPLODED VIEWS
8-1. Over All Section ·························································· 47
8-2. Front Panel Section ····················································· 48
8-3. Chassis Section ···························································· 49
8-4. CD Mechanism Section ··············································· 50
8-5. KSM-213D ·································································· 51
9. ELECTRICAL PARTS LIST······································· 52
2
SECTION 1
SERVICING NOTES
HCD-GP7
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 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.
This label is located on the rear exterior.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
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 pickup block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective 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.
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 viscous (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-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.
CAUTION : Not to Contact with the heat Sink.
Secure the respective cables firmly with the lead pins
so as not to contact them with the heat sink.
Lead pin
heat sink
MAIN board
3
HCD-GP7
Service Position of the Tape Cassette Mechanism Deck
MAIN board
Service Position of the CD Mechanism Deck
Tape Cassette Mechanism Deck
(CMAL1Z240A)
MAIN board
CD Mechanism Deck
(CDM55A-K6BD47S)
4
SECTION 2
Illustrati
GENERAL
List of button locations and reference pages
HCD-GP7
This section is extracted
from instruction manual.
How to use this page
Use this page to find the location of buttons and other
parts of the system that are mentioned in the text.
Main unit
ALPHABETICAL ORDER
A – M
Cassette compartment qg
CD SYNC qd (16)
DIRECTION 9 (15, 16, 17, 19)
Disc tray 4
Display window 3
DSG qa (17)
MD (VIDEO) qj (22)
P – Z
PHONES jack qh
PLAY MODE/TUNING MODE
9 (8, 10, 12, 13, 26)
Remote sensor 2
REPEAT/FM MODE 8 (10, 14)
TUNER/BAND qj (12, 13)
TUNING +/– 6 (12, 13)
VOLUME* 7 (18)
on number
r
DISPLAY 5 (14, 20, 21)
RR
Name of button/part Reference page
BUTTON DESCRIPTIONS
?/1 (power) 1 (7, 12, 18, 19, 2 3,
26)
.m/M> (go back/go
forward, rewind/fast forward)
6 (7, 9, 10, 15, 17, 18, 19)
x (stop) qs (9, 12, 15, 16, 17, 26)
REC PAUSE/START z qf (16,
17)
CD NX (play/pause) qk (8, 10)
TAPE nN (play) qk (15, 16,
17, 19)
Z (CD open/close) 5 (8, 9)
Z PUSH (tape open/close) 0
(15)
*To adjust the volume, first
press this control, and then
turn it.
12 345
qk
qj
qh
qdqfqg
0qaqs
6
7
8
9
5
HCD-GP7
Remote control
ALPHABETICAL ORDER
A – F
ALBUM +/– 8 (9, 10)
BASS/TREBLE qa (17)
CLEAR 3 (11)
CLOCK/TIMER SELECT qh
(19, 20)
CLOCK/TIMER SET qj (7, 18,
19)
DISPLAY 5 (14, 20, 21)
DSG 0 (17)
ENTER qg (7, 9, 10, 12, 18, 19)
FUNCTION 9 (8, 10, 12, 15, 22)
qj
qh
N – Z
Numeric buttons 2 (9, 11, 13)
PRESET +/– 6 (12, 13)
SLEEP qf (18)
TUNER MEMORY qd (12)
TUNING +/– 7 (12, 13)
VOL +/– 4 (18)
BUTTON DESCRIPTIONS
?/1 (power) 1 (7, 12, 18, 19, 23,
26)
m/M (rewind/fast forward)
7 (9, 15)
./> (go back/go forward)
6 (7, 9, 10, 17, 18, 19)
x (stop) qs (9, 12, 15, 16, 17)
X (pause) qs (9, 15)
N (play) qs (8, 10, 15, 16, 17,
19)
1
qg
qf
qd
qs
qa
0
9
2
3
4
5
6
7
8
6
• This set can be disassembled in the order shown below.
SET
TOP CASE, BACK PANEL,
MAIN BOARD
SECTION 3
DISASSEMBLY
HCD-GP7
Ver 1.1 2003.11
FRONT PANEL ASSY,
CD MECHANISM DECK
(CDM55A-K6BD47S)
POWER BOARD,
SUB-POWER BOARD
LOADING BOARD CD BOARD TRAY (CDM55D)
THR BOARD, DC FAN
SPEAKER BOARD,
POWER-AMP BOARD
PANEL BOARD,
HP BOARD, VOL BOARD
TC BOARD,
SINGLE CASSETTE MECHANISM
OPTICAL PICK-UP
(KSM-213D),
HOLDER (C213)
7
HCD-GP7
Note: Follow the disassembly procedure in the numerical order given.
3-1. Top Case, MAIN Board, Back Panel Assy
4
2
three s
(+BVTP 3
crews
top case
×
10)
a
3
five s
crews
(+BVTT 3
8
w
ire (flat type)
11p
×
8)
ql
back panel
tuner (FM/AM)
a
5
three s
(+BVTP 3
crews
×
10)
1
three s
(+BVTP 3
qa
connector (CN401)
qd
connector (CN302)
crews
×
b
10)
qs
(CN306)
b
qf
(CN304)
connector
connector
9
s
(+BVTP 3
crew
qg
qj
qk
connector (CN972)
qh
MAIN board
0
s
crew
(+BVTP 3
×
10)
connector (CN303)
6
five s
crews
(+BVTT 3
7
s
crew
(+BVTP 3
connector (CN962)
×
10)
×
8)
×
10)
8
3-2. Front Panel Assy, CD Mechanism Deck
k
7
connector 4p (CNJ331)
1
four claws
3
four s
(+BVTP 3
crews
×
12)
4
CD mechanism dec
HCD-GP7
8
front panel assy
2
CD lid
6
two s
(+BVTT 3
crews
5
×
8)
9
HCD-GP7
)
)
3-3. PANEL Board, HP Board, VOL Board
7
1
york bracket
2
HP board
3
ten s
(+BVTP 3
PA NEL board
8
crews
×
10)
volume knob
9
two s
(+BVTP 3
0
VOL board
6
connector 3p (CN811)
crews
×
8)
4
qa
VOL bracket
5
w
ire (flat type)
17p (CN801)
four s
crews
(+BVTP 3
×
10
3-4. TC Board, single cassette mechanism(CMAL1Z240A)
3
w
ire (flat type) 8p (CN602)
7
two s
6
s
crew
(+BTP 2.6
×6
)
9
crews
×10
(+BVTP 3
single cassette mechanism
(CMAL1Z240A)
)
2
1
connector 6p
8
two s
(+BVTP 3
w
ire (flat type) 19p (CN603)
4
three s
(+BTP 2.6
5
TC board
crews
×10
)
crews
×6
10
3-5. CD Mechanism (CDM55A-K6BD47S)
)
r
1
CD plate
6
CD mechanism deck
(CDM55A-K6BD47S)
4
s
crew (+BVTP 3
3
CN101
×
10)
2
w
ire (flat type) 31p (CN101
HCD-GP7
5
CD holder
3-6. THR Board, DC FAN
9
s
crew
qs
DC fan
0
four s
(+BVTT 3
crews
qa
×
8)
four s
crews
(+BVTP 3
3
three s
crews
×
(+BVTT 3
×
10)
10)
6
s
(+BVTT 3
crew
7
THR board
×
8)
5
connector 2p
(CN992)
1
three s
(+BVTP 3
2
qd
fan bracket
crews
×
10)
tuner(FM/AM)
4
heat sink cove
8
s
crew
11
HCD-GP7
k
d
3-7. SPEAKER Board, POWER-AMP Board
3
SPEAKER board
1
connector 6p
(CN982)
8
POWER-AMP board
7
two s
crews
(+BVTP 3
6
amp(pwb) bracket
5
s
(+BVTT 3
×
crew
16)
×
8)
2
4
s
(+BVTP 3
two s
(+BVTP 3
crew
crews
9
×
10)
×
10)
qa
two s
crews
(+BVTT 3
back panel
×
12)
0
heat sin
3-8. SUB-POWER Board, POWER Board
7
four s
crews
8
POWER board
(+BV SUMITITE 4
T901
3
two s
(+BVTT 3
×
8)
crews
5
SUB-POWER board
×
8)
1
connector 9p
(CN951)
2
two s
crews
(+BV SUMITITE B3)
4
power bracket
6
power cor
12
3-9. LOADING Board
p
4
motor
(M901)
1
(LD) assy
Remove the belt.
3
Remove soldering from the two points.
HCD-GP7
3-10. CD Board
4
wire (flat type) 21p (CN101)
2
Remove soldering
from the four points.
2
two
screws (+BTP 2.6
5
LOADING board
×
1
screw(+P 2.6
6)
5
CD board
×
5)
3
wire (flat type) 16
13
HCD-GP7
s
3-11. Tray (CDM55D)
1
While pressing the two protrusions A and B to unlock the two claws as shown,
pull the tray in the direction of the arrow C. (Be careful of the claws.)
A
claw
claw
C
2
tray
3-12. Optical Pick-Up (KSM-213D), Holder (C213)
3
5
screw (+PTTP M2.6)
6
stopper (BU)
7
compression spring
(T213)
8
insulator
qd
optical pick-up
(KSM-213DCP/C2NP)
insulator
B
2
two compression spring
1
(+PTPWH M2.6)
4
9
screw (+PTTP M2.6)
q;
stopper (BU)
qa
compression spring
(T213)
qs
insulator
(T213)
two floating
insulator
screw
14
qg
holder
(C213)
qf
floating
(+PTPWH M2.6)
screws
MEMO
HCD-GP7
15
HCD-GP7
SECTION 4
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 the ?/1 button to turn the set on.
2. Press three buttons x , PLAY MODE and ?/1
simultaneously.
3. All of settings are reset. Then the power is turned off and the
clock is displayed.
[Panel Test Mode]
*This mode is used to check the software version, the fluorescent
indicator tube, LED and keyboard.
Procedure:
1. Press the ?/1 button to turn the set on.
2. Press three buttons x , PLAY MODE and TUNER/BAND
simultaneously.
3.
Segments of the fluorescent indicator tube and LED are all turned on.
4. Version Check : When entering this mode, press the REPEAT
button. The model name (“GP7”) and destination are displayed.
5. Each time the REPEAT button is pressed, the display changes
“MC, GC, CD, CDD, CDMA, CDMB, BDA, BDB, ST, TA,
TM, TC and MD (returns to MC) in this order.
6. When the DSG button is pressed while the version numbers
are displayed, year, month and day of the software creation
appear. When the DSG button is pressed again, the display
returns to the software version display. When the REPEAT
button is pressed while year, month and day of the software
creation are being displayed, those are displayed in the same
order of version display.
7. Key Check : Press the PLAY MODE button and the key check
mode is activated. In the key check mode, the fluorescent
indicator tube displays “K 0 V 0”. Each time a button is pressed,
“K 0” value increases. However, once a button is pressed, it is
no longer taken into account. Key check ends at “K 14 V 0”.
“V 0” value increases like 1, 2, 3 ... if rotating the VOLUME knob
8.
clockwise, or it decreases like 0, 9, 8, ... if rotating counter-clockwise.
9. To exit from this mode, press three buttons in the same manner
as step 2, or disconnect the power cord.
[Common Test Mode]
Procedure:
1. Press the ?/1 button to turn the set on.
2. Press three buttons x , PLAY MODE and TAPE nN
simultaneously.
3. The common test mode is activated and “SLEEP” and “DAILY”
segments flash.
3-1. Amp Test Mode
1. In the common test mode, every time you press the BASS/
TREBLE button on the remote commander, the following
items changes in the order as shown below.
“TONE MAX” (BASS/TRE MAX)
“TONE MIN” (BASS/TRE MIN)
“TONE FLAT” (BASS/TRE FLAT)
2.
When the VOLUME knob is turned clockwise or the VOL +
button on the remote commander is pressed, volume goes MAX.
3. When the VOLUME knob is turned counter-clockwise or
the VOL - button on the remote commander is pressed,
volume goes MIN.
4. To exit from this mode, press the ?/1 button and disconnect
the power cord.
3-2. Tape Test
1. Check the set is in the common test mode.
2. Insert a recordable cassette tape.
3. Input audio signal into the MD IN (J301).
4. Press z REC/PAUSE/START button.
5. Select the recording direction with the TAPE nN button.
6. Press z REC/PAUSE/START button to start recording.
7. When the . m - or + M > button against the
tape recording direction is pressed, the tape is rewound to
the recording started point and the set starts playback.
8. To exit from this mode, press the ?/1 button and disconnect
the power cord.
[CD Ship Mode]
*This mode moves the optical pick-up to the position durable to vibration.
Use this mode when returning the set to the customer after repair.
Procedure:
1. Press the ?/1 button to turn the set on.
2. Set the function to CD.
3.
Press three buttons x , PLAY MODE and CD u simultaneously.
4. A message “LOCK” is displayed on the fluorescent indicator
tube, and the CD ship mode is set. Disconnect the power cord.
[Ship Mode]
* This mode is the combination of CD ship mode and cold reset.
Procedure:
1. Press the ?/1 button to turn the set on.
2. Set the function to CD.
3. Press three buttons x , REPEAT and ?/1 simultaneously.
4. A message “LOCK” is displayed on the fluorescent indicator
tube, and the CD ship mode is set. Disconnect the power cord.
[CD Service Mode]
*This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pickup.
Procedure:
1. Press the ?/1 button to turn the set on.
2. Set the function to CD.
3. Press three buttons x , REPEAT and CD u simultaneously.
4. The CD service mode is selected.
5.
With the CD in stop status, press the + M > button to move
the pickup to outside track (“SLED OUT” is displayed.), or press
the . m - button to inside track (“SLED IN” is displayed.).
6. To exit from this mode, disconnect the power cord.
[Disc Tray Lock]
The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.
Setting Procedure:
1. Press the ?/1 button to turn the set on.
2. Press two buttons of x and Z simultaneously for five seconds.
3. The message “LOCKED” is displayed and the tray is locked.
Releasing Procedure:
1.
Press two buttons of x and Z simultaneously for five seconds again.
2. The message “UNLOCKED” is displayed and the tray is
unlocked.
Note : When “LOCKED” is displayed, the tray lock is not released
by turning power on/off with the ?/1 button.
[MD/VIDEO Function Selection Mode]
*This mode is used to select the function of MD or VIDEO.
Procedure:
1. Press the ?/1 button to turn the set off.
2. Press the MD and ?/1 buttons simultaneously.
3. The function will change from MD to VIDEO, and “VIDEO”
is displayed.
4. To change change back to MD, repeat the same procedure.
16
SECTION 5
MECHANICAL ADJUSTMENTS
HCD-GP7
SECTION 6
ELECTRICAL ADJUSTMENTS
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
Mode
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
Torque meter Meter reading
3.04 – 6.96 mN • m
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
(31 to 71 g • cm)
(0.43 – 0.98 oz • inch)
0.20 – 0.58 mN • m
(2 to 6 g • cm)
(0.02 – 0.08 oz • inch)
3.04 – 6.96 mN • m
(31 to 71 g • cm)
(0.43 – 0.98 oz • inch)
0.20 – 0.58 mN • m
(2 to 6 g • cm)
(0.02 – 0.08 oz • inch)
6.97 – 14.02 mN • m
(71 to 143 g • cm)
(0.98 – 1.99 oz • inch)
9.8 mN • m or more
(100 g • cm or more)
(1.4 oz • inch or more)
9.8 mN • m or more
(100 g • cm or more)
(1.4 oz • inch or more)
DECK SECTION
0 dB=0.775 V
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 RCH.
7. Switches and controls should be set as follows unless otherwise
specified.
• Test Tape
Tape Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
[Record/Playback Hrad Azimuth Adjustment]
Procedure:
1. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
set
MAIN board
CN302
Pin
4
(L-CH)
6
(R-CH)
Pin
MAIN board
CN302
2
(GND)
Pin
level meter
+
–
17
HCD-GP7
e
r
e
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.
Output
level
within
1dB
L-CH
peak
R-CH
peak
within
1dB
Screw
position
L-CH
peak
Screw
position
R-CH
peak
3. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
L-CH
MAIN
board
CN302
set
R-CH
waveform of oscilloscope
in phase 45°90°135°180
pin
L
R
pin
good
4
pin
6
2
oscilloscop
V
wrong
H
°
4. Repeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Record/Playback/Erase Head.
[Rec Bias Adjustment]
Procedure:
In the common test mode, the “Tape test mode” is convenient for
this adjustment. In the “Tape test mode”, when the REC starts the
input signal FUNCTION is switched to MD automatically.
When the REC stops, the tape returns near to the recording start
position.
1. Press MD (VIDEO) button to select MD. (This step is not
necessary if the above test mode has already been set)
2. Insert a tape into deck B.
3. After press z REC PAUSE/START button, press z REC
PAUSE/START button, then recording start.
4. Mode: Record
MAIN board
MD (VIDEO)(J301)
1) 315 Hz
AF OSC
2) 10 kHz
attenuator
5. Mode: Playback
recorded
portion
6. Confirm the playback signal recorded in step 3 becomes
adjustable level as follows.
If these levels are not adjustable level, adjust the RV653 (L-CH)
and RV603 (R-CH) on the TC board to repeat steps 4 and 5.
Adjustable level: Playback output of 315 Hz to playback output
Adjustment Location: TC board & MAIN board
50 mV (–23.8 dB)
600
Ω
MAIN board
CN302
4
(L-CH)
Pin
6
(R-CH)
Pin
set
MAIN board
CN302 Pin
of 10 kHz: ±1.0 dB
set
2
(GND)
blank tap
CN-123
level mete
+
–
18
forward reverse
Adjustment Location
[MAIN board] (Conductor Side)
CN302
19
18
HCD-GP7
[TC board] (Component Side)
Rec Bias Adjustment
RV653 (L-CH)
2
1
IC401
IC602
RV603 (R-CH)
19
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