Sony HCD-GTR33 / HCD-GTR55 / HCD-GTR77 / MHC-GTR33 / MHC-GTR55 / MHC-GTR77 Service Manual ▷ View online
HCD-GTR33/GTR55/GTR77
13
SECTION 4
MECHANICAL ADJUSTMENTS
(For African model only)
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened-
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened-
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head demag-
netizer. (Do not bring the head magnetizer close to the erase
head.)
head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
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
Torque Meter
Meter Reading
FWD
CQ-102AS
2.0 – 8.0 mN • m
(20 to 80 g • cm)
(0.28 – 1.12 oz • inch)
FWD
Back Tension
Back Tension
CQ-102C
0.15 – 0.6 mN • m
(1.5 to 6 g • cm)
(0.021 – 0.083 oz • inch)
FF
CQ-201AS
5 – 17.7 mN • m
(50 to 177 g • cm)
(0.7 – 2.48 oz • inch)
REV
CQ-201B
5 – 17.7 mN • m
(50 to 177 g • cm)
(0.7 – 2.48 oz • inch)
•
Tape Tension Measurement
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 80 g
(more than 2.82 oz)
HCD-GTR33/GTR55/GTR77
14
SECTION 5
ELECTRICAL CHECK
FM TUNE LEVEL CHECK
Procedure:
1. Turn on the set.
2. Input the following signal from signal generator to FM antenna
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.
TUNER SECTION
Adjustment Location: Record/Playback/Erase Head
(For African model only)
1. Demagnetize the record/playback head with a head demagne-
1. Demagnetize the record/playback head with a head demagne-
tizer.
2. Do not use a magnetized screwdriver for the adjustments.
TEST TAPE
Tape
Signal
Used for
P-4-A063
6.3 kHz, -10 dB
Azimuth Adjustment
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Procedure:
1. Mode: Playback
Procedure:
1. Mode: Playback
set
MIC board
PHONES jack
(J702)
PHONES jack
(J702)
+
–
level meter
test tape
P-4-A063
(6.3 kHz,
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.
so that outputs match within 1dB of peak.
Screw
position
L-CH
peak
within
1 dB
Output
level
L-CH
peak
R-CH
peak
within
1 dB
Screw
position
R-CH
peak
DECK SECTION
0dB = 0.775V
3. Mode: Playback
set
test tape
P-4-A063
(6.3 kHz,
10 dB)
oscilloscope
V
H
waveform of oscilloscope
in phase 45
q
90
q 135q 180q
good
wrong
MIC board
PHONES jack
(J702)
PHONES jack
(J702)
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
signal
generator
set
HCD-GTR33/GTR55/GTR77
HCD-GTR33/GTR55/GTR77
15
15
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
VOD/D
RF_F
6
VOE/E+G
RF_E
5
VOF/F+H
V2O
12
VC
LDO1
17
LD (780)
AUTOMATIC POWER
CONTROL
Q102-2
LDO2
18
LD (650)
FOO
25
CD ON
SWITCH
Q101-1
CD ON
SWITCH
Q101-2
VR (780)
MSW
GPIO
23
118
VR (650)
FCS+
MSW
MDI1
15
MDI2
16
PD
LIMIT
Q103
SF_CS#
CS_
SD-RAM
IC104
X101
27MHz
36
FCS–
37
1
TRO
24
TRK+
35
TRK–
34
4
FMO
21
SL+
29
SL–
30
10
DMO
20
SP+
27
SP–
28
31
32
32
41
46
47
47
13
SPFG/OPINN
128
45
GPIO
GPIO
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
XT
ALI
9
1
SF_CK
SCK
39
6
BA0
BA0
78
20
BA1
BA1
80
21
RCLK
CLK
66
38
DQM0
LDQM
55
15
DQM1
UDQM
65
39
RAS#
RAS
77
18
CAS#
CAS
76
17
R
WE#
WE
75
16
: CD PLAY
: AUDIO
: AUDIO
: USB
FOCUS
COIL DRIVE
TRACKING
COIL DRIVE
SLED
MOTOR DRIVE
SPINDLE
MOTOR DRIVE
REGULATOR
GPIO
MUTE123
116
19
6
7
MUTE4
MUTE4
22
20
GPIO
TSD-M
94
22
IOPMON/
OPINP
OPINP
127
40
8
PS 21
BUFFER
BUFFER
RF +3.3V
43
REGO2
REGO1
REGO2
REGO1
(KHM-313CAB)
FLASH ROM
IC102
XT
ALO
10
L-OUT
115
119
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
3 LRCK
4 MCLK
USB_DP 27
R-CH
USB_DM 28
SO
2
SI
5
SF_DO
37
SF_DI
38
CD MECHANISM
DECK
M1-
M2+
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
SW2
SW7-CHACK
SW1
SW1 23
SW3 22
SW2 25
SW3 22
SW2 25
SW-CHUCK 24
SW5-STOCK
SW8-OPEN
SW6-CLOSE
SW-STOCK 27
SW-CLOSE 26
SW-CLOSE 26
SW-OPEN 28
2
USBDN1_DP
1
USBDN1_DM
73
MTK-OC2
CN1001
3
2
1
D+
D–
68
MTK-OC1
VBUS
VBUS OVER
CURRENT DETECT
IC1500
4
USBDN2_DP
3
USBDN2_DM
3
2
1
D+
D–
VBUS
MTK-RST
48
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
IFBSY 87
HUB_RST
47
VBus_Det
57
VBUS_DET
27
RESET_N
26
X1500
24MHz
XTAL1/
CLKIN
CLKIN
33
XTAL2
32
USB +5V
PLAY A
REC/PLAY B
CN1000
SIGNAL PATH
R-ch is omitted due to same as L-ch.
OPOUT
126
1
7
3
5
A (Page 16)
B (Page 16)
HCD-GTR33/GTR55/GTR77
HCD-GTR33/GTR55/GTR77
16
16
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
DA
TA
22
CLK
42
30
AUX-L
46 MIC
29 VOLINL
TONEOUTL
26
OUTL
44 CD-L
67 ST-DOUT
66 ST-CLK
63 ST-CE
63 ST-CE
R2A15216FP-DA
TA
60
TC REC MUTE
41
TP
ST
ATE
70
9
SA2
POWER ILLUMINA
TOR
71
VACS IN
89
R2A15216FP-CLK
59
HP/MIC DET
66
23
SWOUT
28
BB1L
37
RECAL
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
1
3
7
5
R-CH
Q682
7
5
5
7
R-CH
L501
S501
IC502
IC501
OP AMP
OP AMP
MUTE
SW
Q683
MUTE
SW
BIAS OSC
Q501, 502
Q501, 502
R-CH
EH
VREF
SW
L-CH
TAPE DECK
A
(Page 15)
13
X-OUT
15
X-IN
X402
8MHz
11
XC-OUT
10
XC-IN
X401
32.768kHz
Abbreviation
E4 :
E4 :
African
model
J (Page 17)
B (Page 15)
D (Page 17)
E (Page 17)
F (Page 17)
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