Test Mode - Sony HCD-D290 Service Manual

QQ
3 7 63 1515 0
SECTION 4
MECHANISM ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback head
erase head
capstan
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
Forward CQ-102C
Forward
CQ-102C
Back Tension
Reverse CQ-102RC
Reverse
CQ-102RC
Back Tension
FF, REW CQ-201B
TE
• Tape Tension Measurement
L 13942296513
Mode Tension Meter
Forward CQ-403A
Reverse CQ-403R
www
.
http://www.xiaoyu163.com
pinch roller
rubber belts
idlers
Meter Reading
36 to 61g·cm
(0.50 – 0.84 oz·inch)
2 to 6g·cm
(0.026 – 0.082 oz·inch)
36 to 61g·cm
(0.50 – 0.84 oz·inch)
2 to 6g·cm
(0.026 – 0.082 oz·inch)
61 to 143g·cm
(0.85 – 1.98 oz·inch)
Meter Reading
more than 100g (3.52 oz)
more than 100g (3.52 oz)
x ao u163
y
i
– 32 –
http://www.xiaoyu163.com
2 9
8
SECTION 5
ELECTRICAL ADJUSTMENTS
DECK SECTION 0dB=0.775V
1. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
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 sup-
ply 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.)
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.
8. Set to test mode. (Press key switch same time GROOVE
ENTER/NEXT and DISC 4 button.)
• Test Tape
Tape Signal
P-4-A100 10kHz, –10 dB
WS-48B 3kHz, 0dB
P-4-L300 315Hz 0dB
Record/Playback Head Azimuth Adjustment
Q Q
3 6 7 1 3 1 5
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback (FWD)
test tape
main board
P-4-A100
CN207
(10KHz, –10dB)
Pin 1 (L-CH)
Pin 3 (R-CH)
set
main board
CN207
Pin 2
co
.
9 4 2 8
Used for
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
0 5 8 2 9 9 4 2 8
level meter
+
–
m
9 9
9 9