Sony HCD-GN1300D / MHC-GN1300D Service Manual ▷ View online
HCD-GN1300D
21
SECTION 4
MECHANICAL ADJUSTMENTS
Precaution
1. Clean the following parts with a denatured alcohol-moistened
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 demagne-
tizer.
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-102C
2.9m N • m to 6.9m N • m
30 to 70 g • cm
(0.42 – 0.97 oz • inch)
FWD
back tension
back tension
CQ-102C
0.15m N • m to 0.59m N • m
2 to 6 g • cm
(0.03 – 0.08 oz • inch)
REV
CQ-102RC
2.9m N • m to 6.9m N • m
30 to 70 g • cm
(0.42 – 0.97 oz • inch)
REV
back tension
back tension
CQ-102RC
0.15m N • m to 0.59m N • m
2 to 6 g • cm
(0.03 – 0.08 oz • inch)
FF/REW
CQ-201B
4.8m N • m to 16.7m N • m
49 to 170 g • cm
(0.68 – 2.36 oz • inch)
HCD-GN1300D
22
SECTION 5
ELECTRICAL ADJUSTMENTS
[FM Tune Level Check]
Procedure:
1. Turn the power on.
2. Input the following signal from Signal Generator to FM
1. Turn the power on.
2. Input the following signal from Signal Generator to FM
antenna input directly.
* Carrier Freq : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation : 75 kHz
Modulation : 1 kHz
ANT input : 35 dBu (EMF)
Note: Please use 75 ohm “coaxial cable” to connect SG and the set. You
cannot use video cable for checking.
Please use SG 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.
The mark of “TUNED” means “The selected station signal is
received in good condition.”
TUNER SECTION
FM signal generator
OUT (75 7)
SET
DECK SECTION
Tape
Signal
Used for
P-4-A100
10 kHz, –10 dB
Azimuth Adjustment
0 dB=0.775V
1. Demagnetize the record/playback head with a head demagne-
tizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
3. After the adjustments, apply suitable locking compound to the
parts adjusted.
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 ad-
justment.)
should be completed before performing recording circuit ad-
justment.)
6. The adjustments should be performed for both L-CH and
RCH.
7. Switches and controls should be set as follows unless other-
wise specifi ed.
• Test Tape
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Procedure:
1. Mode: Playback
1. Mode: Playback
set
Audio Out Jack
at Back Panel
(White-L-CH)
(Red-R-CH)
Chassis GND
+
–
level meter
test tape
P-4-A100
(10 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 outouts match within 1dB of peak.
screw so that outouts match within 1dB of peak.
DECK
L-CH
peak
peak
Output
level
level
within
1dB
1dB
within
1dB
1dB
Screw
position
position
R-CH
peak
peak
R-CH
peak
peak
L-CH
peak
peak
Screw
position
position
HCD-GN1300D
23
DVD SECTION
3. Mode: Playback
set
Audio Out Jack
at Back Panel
test tape
P-4-A100
(10 kHz, –10 dB)
Chassis-GND
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
° 135° 180°
good
wrong
Red-R-CH
White-L-CH
L
R
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Record/Playback/Erase Head
[TEST DISC LIST]
Use the following test disc on test mode.
• CD:
Use the following test disc on test mode.
• CD:
YEDS-18 (PART No. 3-702-101-01)
or
PATD-012 (PART No. 4-225-203-01)
• DVD (SL)
NTSC
NTSC
HLX-503 (PART No. J-6090-069-A)
or
HLX-504 (PART No. J-6090-088-A)
PAL
HLX-506 (PART No. J-6090-077-A)
• DVD (DL)
NTSC
NTSC
HLX-501 (PART No. J-6090-071-A)
or
HLX-505 (PART No. J-6090-089-A)
PAL
HLX-507 (PART No. J-6090-078-A)
Note: When the BASE UNIT is replaced, perform the Execute
IOP measurement
(Refer to page 18).
[RFMON Level Check]
Connection:
Connection:
+
–
–
CN105 pin (RFMON)
CN105 pin (GND)
oscilloscope
DMB18 board
Procedure:
1. Connect an oscilloscope to CN105 pin 6 (RFMON) and CN105
1. Connect an oscilloscope to CN105 pin 6 (RFMON) and CN105
pin 3 (GND) on the DMB18 board.
2. Turn the power on.
3. Set the test disc (DVD: HLX-503 (NTSC) or HLX-504 (PAL),
3. Set the test disc (DVD: HLX-503 (NTSC) or HLX-504 (PAL),
CD: YEDS-18) on the tray and press
C#
button to play-
back.
4. Confi rm that oscilloscope waveform is clear and check RF-
MON signal level is correct or not.
Note: A clear RFMON signal waveform means that the shape “◊”
can be clearly distinguished at the center of the waveform.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
RFMON signal waveform
level: 0.58 to 1.23 Vp-p (DVDSL)
0.57 to 1.1 Vp-p (CD)
reverse
forward
HCD-GN1300D
24
Checking Location: DMB18 board (Side A)
IC102
IC101
IC104
IC201
CN105
CN109
DMB18 BOARD (SIDE A)
CN105 pin (GND)
CN105 pin (RFMON)
1
6
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