Sony HCD-GS300AV Service Manual ▷ View online
17
HCD-GS300AV
3-19. DOOR LED Board
9
CD holder (A)
0
DOOR LED Board
1
connector 2p (CN704)
5
CD lid
6
CD window
7
8
4
3
two screws
(BVTP2.6)
(BVTP2.6)
CD lid
2
Ver 1.3 2003.11
18
HCD-GS300AV
[Panel Test Mode]
Procedure:
1. Press three buttons of
1. Press three buttons of
x
,
[MENU]
, and
[DISPLAY]
simulta-
neously.
2. LEDs and fluorescent indicator tube are all turned on.
3. Press the
3. Press the
[MENU]
button and go to the version display mode.
Press the
m
button and go to the key and jog test mode.
4. To release from these mode, press three buttons in the same
manner as step 1, or disconnect the power cord.
– Version display mode –
In the version display mode, each time the
[MENU]
button is
pressed, the display changes in the order of MC, GC, CD, CDD,
CDM A, CDM B, BDA, BDB, ST, TA, TM and TC.
Press the
CDM A, CDM B, BDA, BDB, ST, TA, TM and TC.
Press the
.
button to display the date of the software.
– Key and jog test mode –
In the key check mode, the fluorescent indicator tube displays
“K 0 J0 V0”. Each time a button is pressed, “K” value in-
creases without
“K 0 J0 V0”. Each time a button is pressed, “K” value in-
creases without
I
/1
and
[DISPLAY]
buttons. However, once
a button is pressed, it is no longer taken into account.
“J” value increases like 1, 2, 3 ... if turn the
“J” value increases like 1, 2, 3 ... if turn the
[DISC SELECT]
dial clockwise, or it decreases like 0, 9, 8 ... if turn the
[DISC SELECT]
dial counterclockwise.
“V” value increases like 1, 2, 3 ... if turn the
[VOLUME]
knob
clockwise, or it decreases like 0, 9, 8 ... if turn the
[VOLUME]
knob counterclockwise.
[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.
the set to the customer.
Procedure:
1. Turn the power ON or set to the DEMO mode.
2. Press three buttons of
1. Turn the power ON or set to the DEMO mode.
2. Press three buttons of
x
,
[CLEAR]
, and
[DISPLAY]
simul-
taneously.
3. The set is reset, and becomes DEMO mode.
[CD Ship Mode and RAM Initialize]
• This mode moves the optical pick-up to the position durable to
vibration, and initializes the RAM. Use this mode when return-
ing the set to the customer after repair.
ing the set to the customer after repair.
Procedure:
1. Press the
1. Press the
I
/1
button to turn the power ON and select the func-
tion CD.
2. Press three buttons of
[ENTER]
,
[SURROUND MODE]
, and
X
simultaneously.
3. The set is turn the power off and initializes the RAM auto-
matically. A message “LOCK” is displayed on the fluorescent
indicator tube, and the CD delivery mode is set.
indicator tube, and the CD delivery mode is set.
[AM Channel Step 9 kHz/10 kHz Selection Mode]
• The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:
1. Press the
Procedure:
1. Press the
I
/1
button to turn the power on.
2. Select the function “TUNER”, and press the
[TUNER/BAND]
button to select the BAND “AM”.
3. Press the
I
/1
button to turn the power off.
4. Press the
[ENTER]
and
I
/1
buttons simultaneously.
5. Either the message “AM 9k STEP” or “AM 10k STEP” ap-
pears, and thus the channel step is changed over.
SECTION 4
TEST MODE
[CD Service Mode]
• This mode can run the CD sled motor optionally. Use this mode,
for instance, when cleaning the optical pick-up.
Procedure:
1. Press the
1. Press the
I
/1
button to turn the power ON.
2. Select the function “CD”.
3. Press three buttons of
3. Press three buttons of
[ENTER]
,
M
, and
[SURROUND MODE]
simultaneously.
4. Set to the Sled Servo mode.
5. With the CD in stop status, press the
5. With the CD in stop status, press the
M
button to move the
optical pick-up to outside track and display “SLED OUT”, or
press the
press the
m
button to move the optical pick-up to inside
track and display “SLED IN”.
6. To exit from this mode, perform as follows.
1) Move the optical pick-up to the most inside track.
2) Press three buttons of
2) Press three buttons of
x
,
[CLEAR]
, and
[DISPLAY]
simultaneously. (cold reset)
Notes:
• Always move the optical pick-up to most inside track when
exiting from this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can
be chipped.
[VACS Test Mode]
• This mode is used to switch on and off the VACS (Variable At-
tenuation Control System).
Procedure:
1. Press the
1. Press the
I
/1
button to turn the set on.
2. To enter the test mode, press the two buttons
[ENTER]
and
[DOLBY PRO LOGIC] simultaneously.
3. The message “VACS OFF” or “VACS ON” appears.
4. To exit from this mode, press the
4. To exit from this mode, press the
I
/1
button to turn the set
off.
[Function Selection Mode]
• This mode is used to select the input VIDEO or input MD.
Procedure:
1. Turn off the set.
2. Press the two buttons
Procedure:
1. Turn off the set.
2. Press the two buttons
x
and [5.1CH/VIDEO $MD%] simulta-
neously.
3. The message “VIDEO” or “MD” appears.
4. To exit from this mode, press the
4. To exit from this mode, press the
I
/1
button to turn the set
off.
19
HCD-GS300AV
SECTION 5
MECHANICAL ADJUSTMENTS
•
TAPE MECHANISM DECK SECTION
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 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
2.94 mN • m to 7.84 mN • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.14 mN • m to 0.59 mN • m
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
2.94 mN • m to 7.84 mN • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.14 mN • m to 0.59 mN • m
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
6.86 mN • m to 17.64 mN • m
71 to 143 g • cm
(0.98 – 1.99 oz • inch)
more than 0.98 N • m
100 g or more
(3.53 oz or more)
more than 0.98 N • m
100 g or more
(3.53 oz or more)
Mode
Torque meter
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Meter reading
FWD
FWD
back tension
back tension
REV
REV
back tension
back tension
FF/REW
FWD tension
REV tension
SECTION 6
ELECTRICAL ADJUSTMENTS
Precaution
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 ad-
justment should be completed before performing recording
circuit adjustment.)
justment should be completed before performing recording
circuit adjustment.)
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 specified.
• Test Tape
Tape
Signal
Used for
P-4-A100
10 kHz, – 10 dB
Azimuth Adjustment
WS-48B
3 kHz, 0 dB
Tape Speed Check
0 dB = 0.775 V
DECK SECTION
20
HCD-GS300AV
Tape Speed Check
Mode: Playback
1. Insert the WS-48B into the deck.
2. Press the bB button on the deck.
3. Confirm that the frequency counter reads 3,000 ± 90 Hz.
2. Press the bB button on the deck.
3. Confirm that the frequency counter reads 3,000 ± 90 Hz.
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
(WS-48B)
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.
3. Mode: Playback
4. Reapeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
5. After the adjustments, apply suitable locking compound to the
parts adjusted.
Screw
position
position
L-CH
peak
peak
within
1dB
1dB
Output
level
level
L-CH
peak
peak
R-CH
peak
peak
within
1dB
1dB
Screw
position
position
R-CH
peak
peak
set
test tape
P-4-A100
(10 kHz, – 10 dB)
P-4-A100
(10 kHz, – 10 dB)
R-CH
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
AMP board
FRONT SPEAKER terminal (J501)
L-CH
FRONT SPEAKER terminal (J501)
L-CH
+
–
–
set
test tape
WS-48B
(3 kHz, 0 dB)
WS-48B
(3 kHz, 0 dB)
AMP board
FRONT SPEAKER terminal (J501)
L-CH, R-CH
FRONT SPEAKER terminal (J501)
L-CH, R-CH
frequency counter
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: Playback (FWD)
1. Mode: Playback (FWD)
set
AMP board
FRONT SPEAKER terminal (J501)
L-CH, R-CH
FRONT SPEAKER terminal (J501)
L-CH, R-CH
+
–
–
level meter
test tape
P-4-A100
(10 kHz, – 10 dB)
P-4-A100
(10 kHz, – 10 dB)
Adjustment Location: Record/Playback/Erase Head
Head azimuth
adjustment screw
adjustment screw
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