Sony HCD-D670AV Service Manual - Page 11

Mechanical Adjustments, Deck Db=0.775v

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SECTION 3 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 demagnetizer. 3. Do not use a magnetized screwdriver for the adjustments. 4. The adjustments should be performed with the rated power supply voltage unless otherwise noted. Torque Measurement Torque Torque meter FWD CQ-102C FWD back tension CQ-102C REV CQ-102RC REV back tension FF/REW CQ-102RC CQ-201B FWD tension CQ-403A REV tension CQ-403R Meter reading 36 to 61g • cm (0.5-0.84 oz • inch) 2 to 6g • cm (0.02-0.08 oz • inch) 36 to 61g • cm (0.5-0.84 oz • inch) 2 to 6g • cm (0.02-0.08 oz • inch) 61 to 143g • cm (0.85-1.99 oz • inch) 100g or more (3.53 oz or more) 100g or more (3.53 oz or more) SECTION 4 ELECTRICAL ADJUSTMENTS DECK SECTION 0 dB=0.775V 1. Demagnetize the record/playback head with a head damagnetizer. 2. Do not use a magnetized screwdriver for the adjustments. 3. After the adjustments, apply suitable locking compound to the parts adjusted. 4. The adjustmetns 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 R-ch. 7. Switches and controls should be set as follows unless otherwise specified. DOLBY NR switch : OFF (US, CND, AEP, UK, G, IT model) 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 (FWD) test tape P-4-A100 (10kHz, -10dB) main board CN403 Pin 3 (L-CH) Pin 1 (R-CH) level meter set main board CN403 Pin 2 • Abbreviation CND : Canadian model. G : German model. IT : Italian model. - 11 -

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— 11 —
SECTION 3
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 demagnetizer.
3.
Do not use a magnetized screwdriver for the adjustments.
4.
The adjustments should be performed with the rated power supply
voltage unless otherwise noted.
Torque Measurement
Torque
FWD
FWD
back tension
REV
REV
back tension
FWD tension
REV tension
FF/REW
Torque meter
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Meter reading
36 to 61g • cm
(0.5–0.84 oz • inch)
2 to 6g • cm
(0.02–0.08 oz • inch)
36 to 61g • cm
(0.5–0.84 oz • inch)
2 to 6g • cm
(0.02–0.08 oz • inch)
61 to 143g • cm
(0.85–1.99 oz • inch)
100g or more
(3.53 oz or more)
100g or more
(3.53 oz or more)
SECTION 4
ELECTRICAL ADJUSTMENTS
DECK SECTION
0 dB=0.775V
1.
Demagnetize the record/playback head with a head damagnetizer.
2.
Do not use a magnetized screwdriver for the adjustments.
3.
After the adjustments, apply suitable locking compound to the
parts adjusted.
4.
The adjustmetns 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 R-ch.
7.
Switches and controls should be set as follows unless otherwise
specified.
DOLBY NR switch : OFF (US, CND, AEP, UK, G, IT model)
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 (FWD)
test tape
P-4-A100
(10kHz, –10dB)
level meter
main board
CN403
Pin
3
(L-CH)
Pin
1
(R-CH)
main board
CN403
Pin
2
• Abbreviation
CND : Canadian model.
G
: German model.
IT
: Italian model.
set