Sony HTC-NX1 / MHC-NX1 / MHC-NX3AV Service Manual ▷ View online
13
SECTION 4
TEST MODE
[LED All Lit, Key Check Mode]
Procedure:
1. Press the
1. Press the
?
/
1
button to turn the power ON.
2. Press three buttons of
s
(DECK B),
A
(DISC 1), and
[DISC 5]
simultaneously.
3. LEDs are all turned on.
Press the
G
(CD) button, and the key check mode is activated.
LEDs are all OFF.
4. When a button is pressed, the LED near the pressed button
blinks or lights up.
Also, if all buttons are pressed, all LEDs light up (not blink).
Also, if all buttons are pressed, all LEDs light up (not blink).
5. To release from this mode, press three buttons in the same
manner as step 2, or remove the power cord.
[CD Delivery Mode]
• 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.
after repair.
Procedure:
1. Press the
1. Press the
?
/
1
button to turn the power ON.
2. Press the
s
(DECK B) and
[DISC 1]
buttons simultaneously.
3. A message “LOCK” is displayed on the liquid crystal display
of the STR-NX1/NX3, and the CD delivery mode is set.
[Tape Deck Test Mode]
(In case of connected to the STR-NX1/NX3)
(In case of connected to the STR-NX1/NX3)
• If connected to the STR-NX1/NX3, the mode also acts as the
STR-NX1/NX3 amplifer test mode.
Procedure:
1. Press the
1. Press the
?
/
1
button to turn the power ON.
2. Press three buttons of
s
(DECK B),
A
(DISC 1), and
S
(CD)
simultaneously.
3. On liquid crystal display of the STR-NX1/NX3, the disc cal-
endar blinks, and “ALC OFF” is displayed, then the function
which was set before the test mode became active is displayed.
which was set before the test mode became active is displayed.
4. The automatic level control of the tape deck is in OFF status,
but while the
s
(CD) and
[REC PAUSE/START]
buttons are
pressed during recording, automatic level control goes in ON
status.
status.
[Tape Deck Test Mode]
(In case of connected to the power feed jig)
(In case of connected to the power feed jig)
Procedure:
1. Turn on the Power switch on the power feed jig.
2. Press three buttons of s (DECK B), A (DISC 1),
1. Turn on the Power switch on the power feed jig.
2. Press three buttons of s (DECK B), A (DISC 1),
and s (CD) simultaneously.
3. The G (CD) and S (CD) LEDs blink, and then pressing G
(CD), G / g (DECK A), or G / g (DECK B) button can
make each play possible.
make each play possible.
4. Also, the other functions are enabled by pressing two buttons
simultaneously.
A combination of respective functions and buttons is as fol-
lows.
A combination of respective functions and buttons is as fol-
lows.
function
button
CD AMS –
s (DECK A), S (CD)
AMS +
s (DECK A), s (CD)
FR
s (DECK B), S (CD)
FF
s (DECK B), s (CD)
Deck-A REW/AMS –
s (CD), g (DECK A)
FF/AMS +
s (CD), G (DECK A)
Deck-B REW/AMS –
s (CD), g (DECK B)
FF/AMS +
s (CD), G (DECK B)
Note:
Check that CD/TC signal change switch of relay connector jig is
set to the TC position.
14
SECTION 5
MECHANICAL ADJUSTMENTS
SECTION 6
ELECTRICAL ADJUSTMENTS
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 sup-
ply voltage unless otherwise noted.
Torque Measurement
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
2 to 6 g • cm
(0.03 – 0.08 oz • inch)
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
2 to 6 g • cm
(0.03 – 0.08 oz • inch)
71 to 143 g • cm
(0.99 – 1.99 oz • inch)
100 g or more
(3.53 oz or more)
100 g or more
(3.53 oz or more)
Mode
FWD
Torque meter
CQ-102C
Meter reading
FWD
back tension
back tension
REV
REV
back tension
back tension
FF/REW
FWD tension
REV tension
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
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.
8. Set to the DOLBY NR OFF.
9. Set to the test mode. (See page 13)
9. Set to the test mode. (See page 13)
• Test Tape
Record/Playback Head Azimuth Adjustment
Note:
Perform this adjustments for both decks
Procedure:
1. Mode: Playback
1. Mode: Playback
Tape
Signal
Used for
P-4-A100
10 kHz, –10 dB
Azimuth Adjustment
WS-48B
3 kHz, 0 dB
Tape Speed Adjustment
P-4-L300
315 Hz, 0 dB
Level Adjustment
0 dB=0.775 V
TAPE DECK SECTION
DECK A DECK B
AUDIO OUT jack
+
–
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
PFJ-1
or
STR-NX1/
NX3
set
15
Tape Speed Adjustment
DECK B
• Execute only if connected to the STR-NX1/NX3
Mode: Playback
1. Insert the WS-48B into the deck B.
2. Press the
2. Press the
G
(DECK B) button.
3. Press the
[HI-DUB]
button in playback mode.
Then at HIGH speed mode.
4. Adjust RV1001 on the LEAF SW board do that frequency
counter reads 6,000 ± 180 Hz.
5. Press the
[HI-DUB]
button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000 ± 90 Hz.
Adjustment Location: LEAF SW board
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
(WS-48B)
Playback level Adjustment
DECK A DECK B
Procedure:
Mode: Playback
Mode: Playback
Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301
(L-CH) and RV401 (R-CH) so that adjustment within specified
value as follows.
(L-CH) and RV401 (R-CH) so that adjustment within specified
value as follows.
Specified Value:
AUDIO OUT jack PB level: 301.5 to 338.3 mV (–8.2 to –7.2
dB) level
difference between the channels: within ± 0.5 dB
dB) level
difference between the channels: within ± 0.5 dB
Adjustment Location: AUDIO board
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. Repeat 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
pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Earth Head (Deck B).
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
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
oscilloscope
AUDIO OUT (R) jack
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
AUDIO OUT (L) jack
L-CH
R-CH
PFJ-1
or
STR-NX1/
NX3
set
forward
reverse
Open the cassette holder
and unhock six claws of
the sub panel (TC2)
with tweezers or something,
then remove the sub panel (TC2).
and unhock six claws of
the sub panel (TC2)
with tweezers or something,
then remove the sub panel (TC2).
+
–
–
AUDIO OUT jack
test tape
WS-48B
(3 kHz, 0 dB)
WS-48B
(3 kHz, 0 dB)
frequency counter
set
STR-NX1/
NX3
+
–
–
test tape
P-4-L300
(315 Hz, 0 dB)
P-4-L300
(315 Hz, 0 dB)
level meter
AUDIO OUT jack
PFJ-1
or
STR-NX1/
NX3
set
16
REC Bias Adjustment
DECK B
Procedure:
1. Mode: Record
1. Mode: Record
2. Mode: Playback
3. Confirm playback the signal recorded in step 1 become speci-
fied value as follows.
If these values are out of specified value, adjust the RV341 (L-
CH) and RV441 (R-CH) on the AUDIO board to repeat steps
1and 2.
If these values are out of specified value, adjust the RV341 (L-
CH) and RV441 (R-CH) on the AUDIO board to repeat steps
1and 2.
Specified value: Playback output of 315 Hz to playback
output of 10 kHz: ± 0.5 dB
Adjustment Location: AUDIO board
REC Level Adjustment
DECK B
Procedure:
1. Mode: Record
1. Mode: Record
2. Mode: Playback
3. Confirm playback the signal recorded in step 1 become speci-
fied value as follows.
If these values are out of specified value, adjust the RV301 (L-
CH) and RV351 (R-CH) on the MAIN board to repeat steps 1
and 2.
If these values are out of specified value, adjust the RV301 (L-
CH) and RV351 (R-CH) on the MAIN board to repeat steps 1
and 2.
Specified value:
AUDIO OUT jack PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
AUDIO OUT jack PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
– MAIN BOARD (Conductor Side) –
– AUDIO BOARD (Component Side) –
– LEAF SW BOARD (Component Side) –
RV401
RV301
RV341
RV311
RV411
IC602
CN601
L
R
R L
RV441
PB LEVEL
– DECK B –
REC BIAS
L
R
PB LEVEL
– DECK A –
TAPE SPEED
RV1002
RV1001
(NORMAL) (HIGH)
CN1001
attenuator
1) 315 Hz
2) 10 kHz
2) 10 kHz
50 mV (–23.8 dB)
PFJ-1
or
STR-NX1/
NX3
AUDIO IN jack
600
Ω
blank tape
CN-123
CN-123
AF OSC
set
+
–
–
recorded
portion
portion
level meter
AUDIO OUT jack
PFJ-1
or
STR-NX1/
NX3
set
attenuator
315 Hz, 50 mV (–23.8 dB)
AUDIO IN jack
600
Ω
blank tape
CN-123
CN-123
AF OSC
PFJ-1
or
STR-NX1/
NX3
set
+
–
–
recorded
portion
portion
level meter
AUDIO OUT jack
PFJ-1
or
STR-NX1/
NX3
set
RV351
(R-CH)
RV301
(L-CH)
(L-CH)
IC301
REC
LEVEL
CN301
1
3
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