Sony MHC-D7 - Page 11

SECTION 4
ADJUSTMENTS
4-1, MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-
moistened swab :
record/playback head _ pinch roller
erase head rubber belts
capstan :
2. Demagnetize the record/playback head with a head
demagnetizer.
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 supply voltage unless otherwise noted.
@ Torque Measurement
Meter Reading
sata om 4 0
(0.50 — 0.84 oz*inch)
Forward 2 to 6gecm
CQ-102C (0.028 ~ 0.083 ozeinch)
36 to 6lgecm
CQ-102RC (0.50 — 0.84 ozsinch)
Reverse CQ-102RC
Back Tension
FF, REW CQ-201B
® Tape Tension Measurement
Motor Reading
CQ-403A more than 100g (3.53 02)
CQ-403R more than 100g (3.53 oz)
2 to 6gecm
(0.028 — 0.083 ozeinch)
61 to 143g*cm
(0.85 — 1.99 ozeinch)
4-2. ELECTRICAL ADJUSTMENTS
DECK SECTION
1. The adjustment should be performed in the publication.
(Be sure to make playback adjustment at first.)
2. The adjustment and measurement should be performed for
both L-CH and R-CH.
@ Switch position
DOLBY NR switch : OFF
FUNCTION button : OFF
EFECT switch : OFF
DBFB switch : OFF
3. Deck section electrical adjustments are made in test mode by
pressing DISPLAY/DEMO, TUNER/BAND, MENUI at the
same time.
4. Input point and output level measurement point.
Output level
—— measurement Input point
paint AF OSC
21.8mV ( - 310B)
R-CH 47k oie)
Output level attenuator re)
measurement |
point
o—-o
ooo | |
ly O———0
(MAIN BOARD}
(Component side)
@ Test Tape
[Tape | Contents [Use Ss
0 dB=0.775V
Record/Playback Head Azimuth Adjustment
Procedure :
1. Forward Playback mode
Reverse Playback mode
test tape
P-4-A100
(f0kHz, — 10dB)
Output level measurement point