Sony HCD-GZR777D / MHC-GZR777D (serv.man2) Service Manual ▷ View online
HCD-GZR777D
25
SECTION 5
ELECTRICAL ADJUSTMENTS
DVD SECTION
When the optical pick-up assy is replaced, perform the “Execute
IOP Measurement”.
IOP Measurement”.
Execute IOP Measurement (See page 22)
[TEST DISC LIST]
Be sure to use the DVD disc that matches the signal standards of
your region.
• CD
your region.
• CD
YEDS-18
(Part No.: 3-702-101-01)
PATD-012 (Part No.: 4-225-203-01)
• DVD SL (Single Layer)
NTSC : HLX-503
NTSC : HLX-503
(Part No.: J-6090-069-A)
HLX-504
(Part No.: J-6090-088-A)
PAL : HLX-506
(Part No.: J-6090-077-A)
• DVD DL (Double Layer)
NTSC : HLX-501
NTSC : HLX-501
(Part No.: J-6090-071-A)
HLX-505
(Part No.: J-6090-089-A)
PAL : HLX-507
(Part No.: J-6090-078-A)
[RFMON Level Check]
Connection:
+
–
–
CN105 pin 6 (RFMON)
CN105 pin 3 (GND)
oscilloscope
DMB19 board
Procedure:
1. Connect an oscilloscope to CN105 pin 6 (RFMON) and
CN105 pin 3 (GND) on the DMB19 board.
2. Turn the power on.
3. Set the test disc (refer to the TEST DISC LIST) on the tray and
3. Set the test disc (refer to the TEST DISC LIST) on the tray and
press the [
N
] button to playback.
4. Confirm 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.
RFMON signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
level: 0.58 ± 1.23 Vp-p (DVD)
0.57 ± 1.1 Vp-p (CD)
Checking Location: DMB19 board (Side A)
CN105 pin 3
(GND)
CN105 pin 6
(RFMON)
– DMB19 BOARD (SIDE A) –
IC104
CN105
CN1104
IC101
CN1
103
TUNER SECTION
FM Tune Level Check
set
signal
generator
Procedure:
1. Turn on the set.
2. Input the following signal from signal generator to FM antenna
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 dB
Modulation : 1 kHz
ANT input : 35 dB
m (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. Confirm “TUNED” is lit on the display for A, B and C signals.
4. Confirm “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.
“TUNED” is displayed.
HCD-GZR777D
26
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
VIDEO SECTION
0 dB = 0.775V
Video Level Check (VIDEO BOARD)
Purpose
This adjustment is made to satisfy the NTSC standard, and if not
adjusted correctly, the brightness will be too large or small.
Purpose
This adjustment is made to satisfy the NTSC standard, and if not
adjusted correctly, the brightness will be too large or small.
oscilloscope
set
J1502
VIDEO OUT
VIDEO OUT
75
:
+
–
–
Procedure:
1. Connect oscilloscope to VIDEO OUT jack.
2. Load a DVD reference disc playback.
3. Check the video signal level is 1.00±0.07Vp-p.
1. Connect oscilloscope to VIDEO OUT jack.
2. Load a DVD reference disc playback.
3. Check the video signal level is 1.00±0.07Vp-p.
1.00 ± 0.07 Vp-p
(WHITE 100%)
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 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 ad-
justment.)
should be completed before performing recording circuit ad-
justment.)
6. The adjustments should be performed for both L-CH and
R-CH.
7. Switches and controls should be set as follows unless other-
wise specifi ed.
• 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
+
–
level meter
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
MAIN board
IC101
pin wh (L-CH)
pin ql (R-CH)
IC101
pin wh (L-CH)
pin ql (R-CH)
MAIN board
IC101
pin t; (GND)
IC101
pin t; (GND)
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.
HCD-GZR777D
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3. Mode: Playback
oscilloscope
waveform of oscilloscope
in phase
good
wrong
45°
90°
135° 180°
V
R
L
R-CH
L-CH
H
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
MAIN
board
IC101
board
IC101
pin wh
pin t;
pin ql
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Record/Playback Head
HCD-GZR777D
28
SECTION 6
DIAGRAMS
• Circuit Boards Location
FRONT board
FL board
DMB19 board
DRIVER board
SW board
SENSOR board
TRANS-SUB board
VIDEO board
MOTOR (LD) board
MOTOR (TB) board
TC-AMP board
MIC board
USB-LED board
LEFT board
VOL-LED board
RIGHT board
POWER AMP board
MAIN board
TRANS board
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