Sony MHC-NX1 Service Manual - Page 57

Mechanical Adjustments, Tape Deck Deck - belt

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SECTION 5 MECHANICAL 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 parts adjusted. 5. The adjustments should be performed with the rated power sup- ply voltage unless otherwise noted. Torque Measurement Mode Torque meter FWD FWD back tension REV REV back tension FF/REW CQ-102C CQ-102C CQ-102RC CQ-102RC CQ-201B FWD tension CQ-403A REV tension CQ-403R Meter reading 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) SECTION 6 ELECTRICAL ADJUSTMENTS TAPE DECK SECTION 0 dB=0.775 V 1. Demagnetize the record/playback head with a head demagnetizer. 2. Do not use a magnetized screwdriver for the adjustments. 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 adjustment.) 6. The adjustments should be performed for both L-CH and RCH. 7. Switches and controls should be set as follows unless otherwise specified. 8. Set to the DOLBY NR OFF. 9. Set to the test mode. (See page 13) • Test Tape Tape P-4-A100 WS-48B P-4-L300 Signal 10 kHz, -10 dB 3 kHz, 0 dB 315 Hz, 0 dB Used for Azimuth Adjustment Tape Speed Adjustment Level Adjustment Record/Playback Head Azimuth Adjustment DECK A DECK B Note: Perform this adjustments for both decks Procedure: 1. Mode: Playback test tape P-4-A100 (10 kHz, -10 dB) set PFJ-1 or STR-NX1/ NX3 level meter + - AUDIO OUT jack 14

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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
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
REV
REV
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
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.)
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)
•
Test Tape
Record/Playback Head Azimuth Adjustment
Note:
Perform this adjustments for both decks
Procedure:
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)
PFJ-1
or
STR-NX1/
NX3
set