• HCD-GTR33 is the amplifi er, USB, CD player, tuner and
tape deck (only E4 model) section in MHC-GTR33.
• HCD-GTR55 is the amplifi er, USB, CD player, tuner and
tape deck (only E4 model) section in MHC-GTR55.
• HCD-GTR77 is the amplifi er, USB, CD player, tuner and
tape deck (only E4 model) section in MHC-GTR77.Photo: HCD-GTR77 (E4 Model)
“WALKMAN” and “WALKMAN” logo are registered
trademarks of Sony Corporation.
MICROVAULT is a trademark of Sony Corporation.
MPEG Layer-3 audio coding technology and patents licensed
from Fraunhofer IIS and Thomson.
Windows Media is a registered trademark of Microsoft
Corporation in the United States and/or other countries.
“Memory Stick” is a trademark of Sony Corporation.
Amplifi er section
MHC-GTR77
The following are measured at
Mexican model:
AC 127 V, 60 Hz
Other models:
AC 120 V, 220 V, 240 V, 50/60 Hz
Front/Satellite Speaker
Power Output (rated):
120 W + 120 W (at 6 Ω, 1 kHz, 1% THD)
Front Speaker
RMS output power (reference):
225 W + 225 W (per channel at 8 Ω, 1 kHz)
Satellite Speaker
RMS output power (reference):
100 W + 100 W (per channel at 24 Ω,
1 kHz)
Subwoofer
RMS output power (reference):
130 W + 130 W (12 Ω, 100 Hz)
MHC-GTR55
The following are measured at
Mexican model:
AC 127 V, 60 Hz
Other models:
AC 120 V, 220 V, 240 V, 50/60 Hz
Front Speaker
Power Output (rated):
110 W + 110 W (at 6 Ω, 1 kHz, 1% THD)
RMS output power (reference):
240 W + 240 W (per channel at 6 Ω, 1 kHz)
Subwoofer
RMS output power (reference):
240 W (6 Ω, 100 Hz)
MHC-GTR33
The following are measured at
Mexican model:
AC 127 V, 60 Hz
Other models:
AC 120 V, 220 V, 240 V, 50/60 Hz
Front Speaker
Power Output (rated):
75 W + 75 W (at 6 Ω, 1 kHz, 1% THD)
RMS output power (reference):
165 W + 165 W (per channel at 6 Ω, 1 kHz)
Subwoofer
RMS output power (reference):
160 W (6 Ω, 100 Hz)
Inputs
PC (AUDIO IN) L/R
Voltage 700 mV, impedance 47 kilohms
MIC
Sensitivity 1 mV, impedance 10 kilohms
(USB) port: Type A
Outputs
PHONES
Accepts headphones of 8 Ω or more
USB section
Supported bit rate
MP3 (MPEG 1 Audio Layer-3):
32 kbps – 320 kbps, VBR
WMA: 48 kbps – 192 kbps
AAC: 48 kbps – 320 kbps
Sampling frequencies
MP3 (MPEG 1 Audio Layer-3):
32 kHz/44.1 kHz/48 kHz
WMA: 44.1 kHz
AAC: 44.1 kHz
Transfer speed
Full-Speed
Supported USB device
Mass Storage Class
Maximum current
500 mA
Disc player section
System
Compact disc and digital audio system
CD Section
Tape Section
(Only for E4 model)
Model Name Using Similar MechanismHCD-GTZ4/GTZ4i/GTZ5
CD Mechanism TypeCDM88BL-DVBU101
Optical Pick-up NameKHM-313CAB/C2NP
Model Name Using Similar MechanismHCD-GT111/GT222/GT444/GT555
Tape mechanism TypeCS-21SC-900TP
SPECIFICATIONS
Laser Diode Properties
Emission Duration: Continuous
Laser Output*: Less than 44.6 μW
* This output is the value measurement at
a distance of 200 mm from the objective
lens surface on the Optical Pick-up Block
with 7 mm aperture.
Frequency response
20 Hz – 20 kHz
Signal-to-noise ratio
More than 90 dB
Dynamic range
More than 88 dB
Tape deck section
(For African model only)
Recording system
4-track 2 channel, stereo
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
North American models:
87.5 MHz – 108.0 MHz (100 kHz step)
Other models:
87.5 MHz – 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
Pan American and Oceanian models:
530 kHz – 1,710 kHz (with 10 kHz tuning
interval)
Antenna
AM loop antenna, external antenna terminal
Intermediate frequency
450 kHz
General
Power requirements
Oceanian model: AC 230 V – 240 V,
50/60 Hz
Mexican model: AC 127 V, 60 Hz
Argentina model: AC 220 V, 50/60 Hz
Other models: AC 120 V, 220 V or
230 V – 240 V, 50/60 Hz, Adjustable with
voltage selector
Power consumption
MHC-GTR77: 260 W
MHC-GTR55: 250 W
MHC-GTR33: 280 W
Dimensions (w/h/d) (excl. speakers)
(Approx.)
231 mm × 361 mm × 429.5 mm
Mass (excl. speakers) (Approx.)
African and Pan Asian models:
HCD-GTR77/HCD-GTR55: 10.7 kg
HCD-GTR33: 10.5 kg
Other models:
HCD-GTR77/HCD-GTR55: 10.2 kg
HCD-GTR33: 10.0 kg
Design and specifi cations are subject to change
without notice.
Audio & Video Business Group
Published by Sony EMCS (Malaysia) PG Tec
HCD-GTR33/GTR55/GTR77
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.
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 AC leakage from any 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. Follow the manufacturers’ instructions to use these instruments.
2. A battery-operated AC 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 low-voltage scale. The Simpson
250 and Sanwa SH-63Trd are examples of a passive VOM that is
suitable. Nearly all battery operated digital multimeters that have a 2
V AC range are suitable. (See Fig. A)
To Exposed Metal
Parts on Set
AC
1.5 kΩ0.15 μF
Earth Ground
voltmeter
(0.75 V)
Fig. A. Using an AC voltmeter to check AC leakage.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specifi ed herein may result in hazardous radia-
tion exposure.
This appliance is classified as a CLASS 1
LASER product. This 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 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.
8. ELECTRICAL PARTS LIST ............................... 58
2
SECTION 1
SERVICING NOTES
HCD-GTR33/GTR55/GTR77
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 fl exible 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 refl ective 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.
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 fl ow)
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.
MODEL IDENTIFICATION
– Back Panel –
PART No.
ModelPart No.
HCD-GTR33: E2, E51
HCD-GTR33: AR
HCD-GTR33: MX
HCD-GTR33: E4
HCD-GTR55: E2, E51
HCD-GTR55: AR
HCD-GTR55: MX
HCD-GTR55: E4
HCD-GTR77: E2, E51
HCD-GTR77: AR
HCD-GTR77: MX
HCD-GTR77: E4
• Abbreviation
AR : Argentina model
E2 : 120V AC area in E model
E4 : African model
E51 : Chilean and Peruvian models
MX : Mexican model
4-164-386-0[]
4-164-386-1[]
4-164-386-2[]
4-164-386-4[]
4-170-620-0[]
4-170-620-1[]
4-170-620-2[]
4-170-620-4[]
4-170-621-0[]
4-170-621-1[]
4-170-621-2[]
4-170-621-4[]
NOTE OF REPLACING THE IC102 ON THE DMB19
BOARD
IC102 on the DMB19 board cannot exchange with single. When
this part is damaged, exchange the entire mounted board.
RELEASING THE DISC TRAY LOCK
The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.
Releasing Procedure:
1. Press [I/
STANDBY] button to turn the power on.
1
2. Press the [CD] button to select CD function.
3. While pressing the [x] button, press the [Z OPEN/CLOSE]
button for more 5 seconds).
4. The message “UNLOCKED” is displayed and the disc tray is
unlocked.
Note: When “LOCKED” is displayed, the slot lock is not released by
turning power on/off with the [I/
STANDBY] button.
1
3
HCD-GTR33/GTR55/GTR77
a
HOW TO OPEN THE TRAY WHEN POWER SWITCH TURN OFF
Step: 1) Work after removing the case (side-R and side-L) referring to “2.2. CASE(SIDE-L/R)” on disassembly (page 5).
2) Work after removing the top case referring to “2-3. TOP CASE” on disassembly (page 6).
state of opening the CD tray
Turn a gear by
d
a driver till a lever
rises up to the
position of the figure.
(Try to push gear at the
lever
same time slowly pull
Front panel away.)
gear
b
c
e
c
HOW TO DISTINGUISH TAPE MECHANISM DECK
Two kinds of tape mechanism decks installed by this set exist.
Please do the repair exchange after confi rming which tape mechanism deck set of the repair according to how to distinguish the fi gure below.
tape deck
motor
Tape Deck NameTape Deck Part No.Belt Part No.
CS-21SC-900TP1-797-575-11
2-688-621-01 BELT (R/F)
2-688-622-01 BELT (MAIN)
Mold part: CS-21SC-900TP
4
DISASSEMBLY
• This set can be disassembled in the order shown below.
2-1. DISASSEMBLY FLOW
SET
2-2. CASE (SIDE-L/R)
(Page 5)
2-3. TOP CASE
(Page 6)
HCD-GTR33/GTR55/GTR77
SECTION 2
2-5. FRONT PANEL BLOCK, HUB BOARD, DMB19 BOARD
(Page 7)
2-6. DC FAN (M101), BACK PANEL
(Page 7)
2-7. MAIN BOARD
(Page 8)
2-8. POWER AMP BOARD
(Page 8)
Note: Follow the disassembly procedure in the numerical order given.
2-9. CHASSIS SECTION
(Page 9)
2-10. CD MECHANISM BLOCK (CDM88BL-DVBU101)
(Page 9)
1 Turn a gear till a lever
rises up to the position
of the figure.
lever
gear
10
SECTION 3
TEST MODE
HCD-GTR33/GTR55/GTR77
PANEL TEST MODE
This mode is used to check the fl uorescent indicator tube, LEDs,
keys, [MASTER VOLUME] jog, [OPERATION DIAL] jog, model, destination and software version.
2. All LEDs and segments in fl uorescent indicator tube are light-
ed up.
3. When you want to enter to the software version display mode,
press [DISC 1] button. The model information appears on the
fl uorescent indicator tube.
• “GVX 1S” is shown for MHC-GTR33.
• “GVX 3S” is shown for MHC-GTR55.
• “GVX 4S” is shown for MHC-GTR77.
Press [DISC 1] button again to view the destination informa-
tion.
4. During the destination information display, press [DISC 1]
button. Each time [DISC 1] button is pressed, the fl uorescent
indicator tube shows the version of each category software in
the following sequence: SC, MTK (DMB Board fi rmware ver-
sion), GC, SYS, CD, CDMA, CDMB, ST, TC TA, TM , MTR
(METER) and return back to model information display.
5. When [DISC 3] button is pressed while the version numbers
are being displayed except model and destination, the date
of the software creation appears. When [DISC 3] button is
pressed again, the display returns to the software version display. When [DISC 1] button is pressed while the date of the
software creation is being displayed, the date of the software
creation is displayed in the same order of software version display.
6. Press [DISC 2] button, the key check mode is activated.
7. In the key check mode, the fl uorescent indicator tube displays
“K 0 V0”.
Each time a button is pressed, “K” value increases. However,
once a button has been pressed, it is no longer taken into account.
“V” value increases in the manner of 0,1, 2, 3 ... if [MASTER
VOLUME] knob is turned clockwise, or it decreases in the
manner of 0, 9, 8,7 ... if [MASTER VOLUME] knob is turned
counterclockwise.
8. When [DISC SKIP/EX-CHANGE] button is pressed after all
LEDs and segments in fl uorescent indicator tube light up, al-
ternate segments in fl uorescent indicator tube and LEDs would
light up. If you press [DISC SKIP/EX-CHANGE] button
again, another half of alternate segments in fl uorescent indi-
cator tube and LEDs would light up. Pressing [DISC SKIP/
EX-CHANGE] button again would cause all segments in fl uo-
rescent indicator tube and LEDs light up.
9. To release from this mode, press three buttons in the same
manner as step 1, or disconnect the power cord.
2. Press [EQ BAND/SURROUND] button repeatedly until a
message “GEQ MIN” appears on the fl uorescent indicator
tube. GEQ decreases to its minimum.
3. Press [EQ BAND/SURROUND] button repeatedly until a
message “GEQ FLAT” appears on the fl uorescent indicator
tube. GEQ is set to fl at.
4. When the [MASTER VOLUME] knob is turned clockwise
even slightly, the sound volume increases to its maximum and
a message “VOLUME MAX” appears on the fl uorescent indi-
cator tube.
5. When the [MASTER VOLUME] knob is turned counterclockwise even slightly, the sound volume decreases to its minimum
and a message “VOLUME MIN” appears on the fl uorescent
indicator tube.
To release from Common Test mode
1. To release from this mode, press [
2. The cold reset is enforced at the same time.
STANDBY] button.
?/1
COLD RESET
The cold reset clears all data including preset data stored in the
EEPROM to initial conditions. Execute this mode when returning
the set to the customer.
Procedure:
1. Press [
2. Press [x] button, [ENTER] button, and [
ton simultaneously.
3. “COLD RESET” appears on the fl uorescent indicator tube.
After that, the fl uorescent indicator tube becomes blank for a
while, and the system is reset.
STANDBY] button to turn on the system.
?/1
?/1
STANDBY] but-
VACS ON/OFF
This mode is used to switch ON and OFF the VACS (Variable Attenuation Control System).
Procedure:
1. Press [
2. Press [x] button, [RETURN], and [DISPLAY] button simultaneously. The message “VACS OFF” or “VACS ON” appears
on the fl uorescent indicator tube.
STANDBY] button to turn on the system.
?/1
TUNER STEP CHANGE
The step interval of AM channels can be toggled between 9 kHz
and 10 kHz.
Procedure:
1. Press [
2. Press [TUNER/BAND] button repeatedly to select the “AM”.
3. Press [
4. Press [ENTER] button and [
neously. The system turns on automatically. The message “AM
9K STEP” or “AM 10K STEP” appears on the fl uorescent
indicator tube and thus the channel step is changed.
STANDBY] button to turn on the system.
?/1
STANDBY] button to turn off the system.
?/1
STANDBY] button simulta-
?/1
COMMON TEST MODE
This mode is used to check operations of the Amplifi er section.
Procedure:
To enter Common Test Mode
1. Press [
CLOSE] button simultaneously.
2. The CD ring indicators fl ash on the fl uorescent indicator tube.
The function is changed to AUDIO and the volume is changed
to VOLUME MIN.
Check of Amplifi er
1. Press [EQ BAND/SURROUND] button repeatedly until a
message “GEQ MAX” appears on the fl uorescent indicator
tube. GEQ increases to its maximum.
] button, [METER MODE] button and [OPEN/
x
CD SHIP MODE (WITH MEMORY CLEAR)
This mode moves the optical pick-up to the position durable to
vibration and clears all data including preset data stored in the EEPROM to initial conditions during the next AC-In. Use this mode
when returning the set to the customer after repair.
Procedure:
1. Press [
2. Select CD function.
3. Press [x] button, [OPEN/CLOSE] button and [
BY] button simultaneously. The system turns off automatically.
4. After the “STANDBY” blinking display fi nishes, a message
“MECHA LOCK” is displayed on the fl uorescent indicator
tube and the CD ship mode is set.
STANDBY] button to turn on the system.
?/1
?/1
STAND-
11
HCD-GTR33/GTR55/GTR77
CD SHIP MODE (WITHOUT MEMORY CLEAR)
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 [
2. Select CD function.
3. Press [DISC SKIP/EX-CHANGE] button and [
BY] button simultaneously. The system turns off automatically.
4. After the “STANDBY” blinking display fi nishes, a message
“MECHA LOCK” is displayed on the fl uorescent indicator
tube and the CD ship mode is set.
STANDBY] button to turn on the system.
?/1
?/1
STAND-
CD TRAY LOCK MODE
This mode let you lock the disc tray. When this mode is activated,
the disc tray will not open when [OPEN/CLOSE] button or [DISC
SKIP/EX-CHANGE] button is pressed. The message “LOCKED”
will be displayed on the fl uorescent indicator tube. This mode only
applied when there is disc(s) on the tray.
Procedure:
1. Press [
2. Select CD function.
3. Press [x] button and [OPEN/CLOSE] button simultaneously
and hold down until “LOCKED” or “UNLOCKED” displayed
on the fl uorescent indicator tube (around 5 seconds).
STANDBY] button to turn on the system.
?/1
FACTORY PRESET
This mode is use to load all the factory use preset frequencies
into FM 1-FM 20 and AM 1-AM 10. Originally, frequency of FM
1-FM 20 and AM 1-AM10 are set to the minimum frequency.
Procedure:
1. Press [
2. Press [EQ BAND/SURROUND] button, [x] button, and
[DISC 1] button simultaneously and the message “FACTORY” appears on the fl uorescent indicator tube. The function is
changed to TUNER automatically.
STANDBY] button to turn on the system.
?/1
VACS DISPLAY
This mode is used to check the VACS level.
Procedure:
1. Press [
2. Press [ERASE] button, [x] button and [ENTER] button simultaneously.
3. The fl uorescent indicator tube displays “V0 AP0”.
“V” represents Conventional VACS (Triggered by signal level)
“AP” represents AP VACS (Abuse Protection Variable Attenuation Control System)
• To release from VACS display mode
To release from this mode, do the step (2) again.
STANDBY] button to turn on the system.
?/1
METER SWITCH TOUCH COUNT DISPLAY
This mode is used to display the total count of meter pointer touch
initial switch and max switch.
Procedure:
1. Press [
2. Press [x] button, [ENTER] button and [DISPLAY] button simultaneously.
3. The fl uorescent indicator tube displays “IxxxxxMyyyyy”.
“I” represents the Initial Switch touch.
“xxxxx” represents the total count of Initial Switch touch.
(Maximum Value of “xxxxx” = 65535)
“M” represents the Max Switch touch.
“yyyyy” represents the total count of Max Switch touch.
(Maximum Value of “yyyyy” = 65535)
• To release from Meter Switch Touch Count Display Mode.
To release from this mode, do the step (2) again.
The fl uorescent indicator tube displays “MODE OUT”.
STANDBY] button to turn on the system.
?/1
METER TEST MODE
This mode is used to check the meter device.
Procedure:
1. Press [
2. Press [x] button, [ENTER] button and [METER MODE] but-
ton simultaneously.
3. Meter Backlight LEDs, Meter Pointer LEDs, Power Illuminator LEDs and fl uorescent indicator tube are lighted up.
4. When you want to perform count total step from Initial
Switch to Max Switch operation mode, press [M / > /
TUNING + ] button. The meter pointer will move from Initial
Switch to Max Switch and fi nally move back to the middle
position. The total step count information appears on the fl uo-
rescent indicator tube. “xxx STP yy” is shown.
“xxx” represents the total step.
(Value of “xxx” should between 430 steps to 470 steps)
“yy” represents the status of total step count.
(If total step between 430 steps to 470 steps, “yy” is OK,
Else “yy” is NG)
5. When you want to perform count total step from Max
Switch to Initial Switch operation mode, press [m / . /
TUNING – ] button. The meter pointer will move from Max
Switch to Initial Switch and fi nally move back to the middle
position. The total step count information appears on the fl uo-
rescent indicator tube. “xxx STP yy” is shown.
“xxx” represents the total step.
(Value of “xxx” should between 430 steps to 470 steps)
“yy” represents the status of total step count.
(If total step between 430 steps to 470 steps, “yy” is OK,
else “yy” is NG)
• To release from Meter Test Mode.
To release from this mode, do the step (2) again.
The fl uorescent indicator tube displays “TST MODE OUT”.
STANDBY] button to turn on the system.
?/1
CDM AGING MODE
This mode is used to display the total count of all disc playing.
Procedure:
1. Press [
2. Select CD function and All DISC play mode
3. Put discs on all trays and close the tray.
4. Press [GROOVE] button, [x] button and [RETURN] button
simultaneously.
“xxxx” represents the error counter
(Maximum Value of “xxxx” = 9999)
“yyyyy” represents the cycle counter
(Maximum Value of “yyyy” = 9999)
6. Press [m / . / TUNING – ] or [M / > / TUNING +
] to search for Aging History Error Display
The fl uorescent indicator tube displays “Mx E1E2E3E4”. x: error history number
E1: Loading sequence JCP high
E2: Loading sequence JCP low
E3: Loading operation JCP
E4: Cam position operation JCP
7. Press [RETURN] to Aging Display
• To release from CDM Aging Mode.
To release from this mode, press [
perform COLD RESET operation.
STANDBY] button to turn on the system.
?/1
STANDBY] button or
?/1
12
SECTION 4
MECHANICAL ADJUSTMENTS
(For African model only)
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistenedswab :
record/playback head pinch roller
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head demagnetizer. (Do not bring the head magnetizer close to the erase
head.)
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
ModeTorque MeterMeter Reading
FWDCQ-102AS
FWD
Back Tension
FFCQ-201AS
REVCQ-201B
CQ-102C
2.0 – 8.0 mN • m
(20 to 80 g • cm)
(0.28 – 1.12 oz • inch)
0.15 – 0.6 mN • m
(1.5 to 6 g • cm)
(0.021 – 0.083 oz • inch)
5 – 17.7 mN • m
(50 to 177 g • cm)
(0.7 – 2.48 oz • inch)
5 – 17.7 mN • m
(50 to 177 g • cm)
(0.7 – 2.48 oz • inch)
HCD-GTR33/GTR55/GTR77
• Tape Tension Measurement
ModeTension MeterMeter Reading
FWDCQ-403A
more than 80 g
(more than 2.82 oz)
13
HCD-GTR33/GTR55/GTR77
SECTION 5
ELECTRICAL CHECK
TUNER SECTION
FM TUNE LEVEL CHECK
signal
generator
set
Procedure:
1. Turn on the set.
2. Input the following signal from signal generator to FM antenna
input directly.
Carrier frequency : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation : 75 kHz
Modulation : 1 kHz
ANT input : 35 dBu (EMF)
Note: Use 75 ohm coaxial cable to connect signal generator and the set.
You cannot use video cable for checking.
Use signal generator whose output impedance is 75 ohm.
3. Set to FM tuner function and tune A, B and C signals.
4. Confi rm “TUNED” is lit on the display for A, B and C signals.
When the selected station signal is received in good condition,
“TUNED” is displayed.
3. Mode: Playback
test tape
P-4-A063
(6.3 kHz, 10 dB)
in phase 45q90q 135q 180q
MIC board
PHONES jack
(J702)
set
waveform of oscilloscope
good
oscilloscope
V
wrong
H
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Record/Playback/Erase Head
DECK SECTION0dB = 0.775V
(For African model only)
1. Demagnetize the record/playback head with a head demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
TEST TAPE
TapeSignalUsed for
P-4-A0636.3 kHz, -10 dBAzimuth Adjustment
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Procedure:
1. Mode: Playback
test tape
P-4-A063
(6.3 kHz, 10 dB)
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.
MIC board
PHONES jack
(J702)
set
level meter
+
–
L-CH
peak
Screw
position
14
R-CH
peak
Output
level
within
1 dB
L-CH
peak
R-CH
peak
within
1 dB
Screw
position
HCD-GTR33/GTR55/GTR77
HCD-GTR33/GTR55/GTR77
1515
6-1. BLOCK DIAGRAM - RF SERVO, USB Section -
SECTION 6
DIAGRAMS
OPTICAL PICK-UP
BLOCK
RF AMP, SERVO DSP,
AUDIO PROCESSOR
IC101
SYSTEM
CONTROLLER
IC401 (1/4)
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
IC201
AUTOMATIC POWER
CONTROL
Q102-1
RF_IP
125
RF_C
3
RF_B
2
RF_A
1
RF_D
4
RF
VOA/A
VOB/B
VOC/C
VOD/D
RF_F6VOE/E+G
RF_E5VOF/F+H
V2O12VC
LDO117LD (780)
AUTOMATIC POWER
CONTROL
Q102-2
LDO2
18LD (650)
FOO25
CD ON
SWITCH
Q101-1
CD ON
SWITCH
Q101-2
VR (780)
MSW
GPIO
23
118
VR (650)
FCS+
MSW
MDI115
MDI216
PD
LIMIT
Q103
SF_CS#CS_
SD-RAM
IC104
X101
27MHz
36
FCS–37
1
TRO24
TRK+35
TRK–34
4
FMO21
SL+29
SL–30
10
DMO20
SP+27
SP–28
31
32
41
46
47
13
SPFG/OPINN128
45
GPIO
GPIO
GPIO
120
DG0, DQ1 – DQ15
RD0 – RD15
PRST #
A0 – A11
RA0 – RA11
2, 4, 5, 7, 8, 10, 11, 13, 42,
44, 45, 47, 48, 50, 51, 53
45 – 49, 51 – 53,
64 – 61, 56 – 59
82, 83, 85, 86,
74 – 69, 81, 67
23 – 26,
29 – 34, 22, 35
36
XTALI
9
1
SF_CKSCK
39
6
BA0BA0
78
20
BA1BA1
80
21
RCLKCLK
66
38
DQM0LDQM
55
15
DQM1UDQM
65
39
RAS#RAS
77
18
CAS#CAS
76
17
RWE#WE
75
16
: CD PLAY
: AUDIO
: USB
FOCUS
COIL DRIVE
TRACKING
COIL DRIVE
SLED
MOTOR DRIVE
SPINDLE
MOTOR DRIVE
REGULATOR
GPIOMUTE123116
19
6
7
MUTE4MUTE422
20
GPIOTSD-M94
22
IOPMON/
OPINP
127
40
8
PS
21
BUFFER
BUFFER
RF +3.3V
43
REGO2
REGO1
REGO2
REGO1
(KHM-313CAB)
FLASH ROM
IC102
XTALO
10
L-OUT
115
119
GPIO
114
GPIO19
106
VINL
14
13
VINR
BCK
7
LRCK
6
8
SCKI
A/D CONVERTER
IC4601
9
DOUT
REC_L
R-CH
USB CONTROLLER
IC1501
31
USBUP_DP
30
USBUP_DM
AOUT-L
5
8
AOUT-R
D/A CONVERTER
IC4602
1
SDATA
2
SCLK
3
LRCK
4
MCLK
USB_DP 27
R-CH
USB_DM 28
SO
2SI5
SF_DO37SF_DI
38
CD MECHANISM
DECK
M1-
M2+
M2-
M1+
M1+
21
M1- 18
M2+
7
M2- 6
MOTOR
DRIVE
Q645 - 648
MOTOR
DRIVE
Q640, 641,
Q643, 644
SW3
SW2
SW7-CHACK
SW1
SW1
23
SW3
22
SW2 25
SW-CHUCK
24
SW5-STOCK
SW8-OPEN
SW6-CLOSE
SW-STOCK
27
SW-CLOSE
26
SW-OPEN 28
2USBDN1_DP
1USBDN1_DM
73MTK-OC2
CN1001
3
2
1
D+
D–
68MTK-OC1
VBUS
VBUS OVER
CURRENT DETECT
IC1500
4USBDN2_DP
3USBDN2_DM
3
2
1
D+
D–
VBUS
MTK-RST48
MTK-TX
35
MTK-RX
36
MTK-CLOCK
37
MTK-XIFCS
34
MTK-BUSY
19
IFSDI
35
IFSOD
41
IFSCK
40
IFCS#
88
IFBSY
87
HUB_RST47
VBus_Det
57
VBUS_DET27
RESET_N
26
X1500
24MHz
XTAL1/
CLKIN
33
XTAL2
32
USB +5V
PLAY A
REC/PLAY B
CN1000
SIGNAL PATH
R-ch is omitted due to same as L-ch.
OPOUT126
1
7
3
5
A
(Page 16)
B
(Page 16)
HCD-GTR33/GTR55/GTR77
HCD-GTR33/GTR55/GTR77
1616
6-2. BLOCK DIAGRAM - MAIN Section -
R-CH
TUNER (FM/AM)
AM
FM ANT
AM ANT
ST-L
ST-R
ST-DOUT
R-CH
R-CH
(E4)
R-CH
ST-DIN
ST-CLK
ST-CE
FM75:
COAXIAL
ANTENNA
TUNED
61 ST-TUNED
43 ST-L
56 ST-R
45 TAPE L
54 TAPE R
36 REC BL
7 REC BR
21
DATA22CLK
4230AUX-L
46 MIC
29 VOLINLTONEOUTL26OUTL
44 CD-L
67 ST-DOUT
66 ST-CLK
63 ST-CE
R2A15216FP-DATA
60
TC REC MUTE
41
TP STATE
70
9
SA2
POWER ILLUMINATOR
71
VACS IN
89
R2A15216FP-CLK
59
HP/MIC DET
66
23SWOUT
28BB1L
37RECAL
BAND-PASS
FILTER
Q115
27
19
17
18
BB2L
BASS AGC
Q128
BASS AGC
Q178
D630
INPUT SELECTOR,
ELECTRICAL VOLUME
IC407
SYSTEM CONTROLLER
IC401 (2/4)
: AUDIO
SIGNAL PATH
R-ch is omitted due to same as L-ch.
: TUNER (FM/AM)
J700
MIC
RV700
MIC LEVEL
IC700 MIC AMP
65 ST-DIN
R
L
J120
PC IN
L-OUT
REC-L
HP DET
OUT
SW OUT
BASS AGC
: MIC
: TAPE (PLAY)
: TAPE (REC)
R-CH
1375
R-CH
Q682
75
57
R-CH
L501
S501
IC502
IC501
OP AMP
OP AMP
MUTE
SW
Q683
MUTE
SW
BIAS OSC
Q501, 502
R-CH
EH
VREF
SW
L-CH
TAPE DECK
A
(Page 15)
13X-OUT
15X-IN
X402
8MHz
11XC-OUT
10XC-IN
X401
32.768kHz
Abbreviation
E4 : African model
J
(Page 17)
B
(Page 15)
D
(Page 17)
E
(Page 17)
F
(Page 17)
HCD-GTR33/GTR55/GTR77
HCD-GTR33/GTR55/GTR77
1717
6-3. BLOCK DIAGRAM - AMP Section -
LINE AMP
IC252
POWER
AMP
IC800
MUTING
Q402
OVER LOAD
DETECT
Q801
OVER LOAD
DETECT
Q800
OVER LOAD
DETECT
Q802
R-CH
MUTING
Q430
LINE AMP
IC253
–1
–2
MUTING
CONTROL
Q670
LINE MUTE
58
STK MUTE
51
17
2022
191310
SW SPK RELAY
52
FAN M OTOR
DRIVE
Q697, 699
RY800
+
–
–
+
RY500
D807
TH802
M
M101
(FAN)
PHONES
+
–
SUBWOOFER
SUBWOOFER
JK500
RELAY
DRIVE
Q500
FR SPK RELAY
53
PROTECT
50
RELAY
DRIVE
Q502
R-CH
J702
SYSTEM CONTROLLER
IC401 (3/4)
: AUDIO
SIGNAL PATH
R-ch is omitted due to same as L-ch.
DC
DETECT
Q803, 806
THERMAL
DETECTOR
Q807, 808
R
L
FRONT
SPEAKER
JK800
+
–
–
+
R
L
SATELLITE
SPEAKER
JK801
FAN ON/OFF
38
BASS AGC
HP DET
OUT
SW OUT
BUFFER
Q431
AC CUT
DETECT
Q501
PROTECT DETECT
Q809, 811
AC DETECT
PROTECT
(GTR77)
(GTR77)
(GTR33/55)
MUTING
Q425
15
8
J
(Page 16)
F
(Page 16)
D
(Page 16)
E
(Page 16)
G
(Page 18)
+
–
+
–
JK501
H
(Page 18)
HCD-GTR33/GTR55/GTR77
HCD-GTR33/GTR55/GTR77
1818
6-4. BLOCK DIAGRAM - PANEL, POWER SUPPLY Section -
REMOTE CONTROL
RECEIVER
IC1100
FL1100
FLUORESCENT
INDICATOR
TUBE
94 SW/USB CTRL
FLUORESCENT INDICATOR
TUBE DRIVER
IC1101
SYSTEM CONTROLLER
IC401 (4/4)
F955
(MX)
(EXCEPT MX)
R955
RECT
D902, 903
D904, 905
PROTECT
DETECT
Q606
RECT
D610 – 613
LED-VOL1. 2
LED-VOL3. 4
LED-VOL5. 6
S1100 – 1109,
S1110 – 1119,
S1124 – 1133,
S1302
54STBY RELAY
RESET SWITCH
Q210, 214, 215
D213
+3.3V
FL +3.3V
83OVERVOLTAGE
20AC CUT
12RESET
85 MASTER VOL
SG5/KS5 –
SG24/KS24
14 – 33
D1105 – 1107, SEL A
D1108 – 1110, SEL B
(STREAM)
LED DRIVE
Q1122
80 USB-LED CTRL
LED DRIVE
Q1121
D1104
SUBWOOFER
95 STBY LED
AD KEY0
4 SIRCS
D1011
I/1
STANDBY
ROTARY
ENCODER
MASTER
VOLUME
S1301
DIN
FL-DRIVER-DATA23
CLK
FL-DRIVER-CLK12
STB
FL-DRIVER-CS31
86
91
90
74
97
87
84
POWER/DISPLAY-KEY
AD-KEY0
AD-KEY1
AD-KEY2
(AC IN)
RY901
RELAY
DRIVE
Q903
VOLTAGE
SELECTOR
S901
DVDD +3.3V
D607D628
D623, 624
FAN
+12V
D908
TUNER +9V,
A+9V
A+9V
M+9V
F956
RECT
D601
F952
F953
F951
F953
RECT
D800
D608
+9V
REGULATOR
IC678
+9V
REGULATOR
IC602
AVDD +5V
+5V
REGULATOR
Q696
VM+9V
+3.3V
REGULATOR
IC603
+4V
REGULATOR
Q211, 212
LED SEL A,
LED SEL B
CD MECHANISM
MOTOR B+
REGULATOR
Q655 – 658
69LED CTRL
5CDM-SD
JOG B+
43AD SUPPLY SW
B+ SWITCH
Q627, 628
–32V
REGULATOR
Q902
AMP
SECTION
B+
FOR
FLUORESCENT
INDICATOR
TUBE
–VFL
VF
VF
PT902
SUB POWER
TRANSFORMER
PT901
MAIN POWER
TRANSFORMER
VCC +3.3V
EVER +3.3V
+VH
–VH
D1002, 1003
PROTECT
(E2, E51, E4)
(MX, AR)
AC DETECT
GR1 – GR14
34 – 47
LED DRIVE
Q1118 – 1120
USB B
D1000
USB A
AVDD +1.8V
82
MTK POWER
MONITOR
RF +3.3V
+5V
REGULATOR
IC677
45MTK OE
USB +5V
(GTR55/77)
D651
METER +5V
+5V
REGULATOR
Q698
D505, 502
B+ SWITCH
Q300 – 303
31
METER LED
CTRL
METER
DISPLAY
BLOCK
RECT
D906, 907
+1.8V
REGULATOR
IC 111
+3.3V
REGULATOR
IC107
39 METER BL CTL
LED DRIVE
Q230
LED SEL A
LED SEL B
LED
LED DRIVE
Q231
81 METER SW
72 METER-IN4
77 METER-IN3
79 METER-IN2
METER-IN1
(GTR55/77)
78
+9V
SWITCH
Q684
M+9V
(E4)
RECT
D801
+VL
–VL
POWER
CONTROL
Q673
SW DRIVER
Q681
49TC_M+9V SW
+12V REG
IC600
(GTR55/77)
G
(Page 17)
H
(Page 17)
Abbreviation
AR : Argentina model
E2 : 120V AC area in E model
E4 : African model
E51 : Chilean and Peruvian models
MX : Mexican model
HCD-GTR33/GTR55/GTR77
HCD-GTR33/GTR55/GTR77
1919
• Circuit Boards Location
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
For Schematic Diagrams.
Note:
• All capacitors are in μF unless otherwise noted. (p: pF) 50
WV or less are not indicated except for electrolytics and
tantalums.
• All resistors are in Ω and 1/4 W or less unless otherwise
specifi ed.
• f : Internal component.
• 2 : Nonfl ammable resistor.
• 5 : Fusible resistor.
• C : Panel designation.
• A : B+ Line.
• B : B– Line.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
- TC Board -
no mark : TAPE PLAY
( ) : TAPE REC
- Other Boards -
no mark : TUNER (FM/AM)
( ) : CD PLAY
<< >> : TAPE PLAY
[ ] : TAPE REC
< > : USB
{ } : PC
* : Impossible to measure
• Voltages are taken with VOM (Input impedance 10 M).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F : AUDIO
f : TUNER (FM/AM)
d : TAPE PLAY
G : TAPE REC
N : MIC
J: CD PLAY
c : DIGITAL
E : USB
• Abbreviation
AR : Argentina model
E2 : 120V AC area in E model
E4 : African model
E51 : Chilean and Peruvian models
MX : Mexican model
For Printed Wiring Boards.
Note:
• X : Parts extracted from the component side.
• Y : Parts extracted from the conductor side.
• f : Internal component.
• : Pattern from the side which enables seeing.
(The other layers’ patterns are not indicated.)
• Indication of transistor.
CEB
These are omitted.
Caution:
Pattern face side:
(SIDE B)
Parts face side:
(SIDE A)
Parts on the pattern face side seen
from the pattern face are indicated.
Parts on the parts face side seen from
the parts face are indicated.
Note: The components identifi ed by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specifi ed.
Caution:
Pattern face side:
(Conductor Side)
Parts face side:
(Component Side)
Parts on the pattern face side seen
from the pattern face are indicated.
Parts on the parts face side seen from
the parts face are indicated.
• DMB19 board is multi-layer printed board.
However, the patterns of intermediate layers have not
been included in diagrams.
• Abbreviation
AR : Argentina model
E2 : 120V AC area in E model
E4 : African model
E51 : Chilean and Peruvian models
MX : Mexican model
C
Q
B
E
These are omitted.
LED (GVX) board
included in METER DISPLAY ASSY
(GTR55/GTR77)
included in DISPLAY PANEL (GVX1) ASSY
(GTR33)
SW (GVX) board
included in METER DISPLAY ASSY
(GTR55/GTR77)
TC board
(For African Model only)
TRANS board
HUB board
MOTOR DRIVE board
included in METER DISPLAY ASSY
(GTR55/GTR77)
MAIN board
POWER board
DMB19 board
TUNER (FM/AM)
VOL board
USB board
MIC board
DISPLAY board
HCD-GTR33/GTR55/GTR77
HCD-GTR33/GTR55/GTR77
2020
6-5. PRINTED WIRING BOARD - DMB19 Board -
Note: When IC102 cannot exchange with single. When this part