Mechanical Adjustments; Electrical Adjustments - Sony WM-FX522 Service Manual

WM-FX522
SECTION 4

MECHANICAL ADJUSTMENTS

PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head
rubber belts
2. Demagnetize the playback head with a head demagnetizer.
(Do not bring the head demagnetizer close to the erase head.)
3. The adjustments should be performed with the rated power
supply voltage (1.3 V) unless otherwise noted.
TORQUE MEASUREMENT
Mode Torque Meter
FWD CQ-102C
FWD
CQ-102C
Back Tension
REV CQ-102RC
REV
CQ-102RC
Back Tension
FF, REW CQ-201B
12
pinch roller
capstan
Meter Reading
1.57 – 2.45 mN•m
(16 – 25 g•cm)
(0.23 – 0.34 oz•inch)
0.049 – 0.147 mN•m
(0.5 – 1.5 g•cm)
(0.007 – 0.02 oz•inch)
1.57 – 2.45 mN•m
(16 – 25 g•cm)
(0.23 – 0.34 oz•inch)
0.049 – 0.147 mN•m
(0.5 – 1.5 g•cm)
(0.007 – 0.02 oz•inch)
more than 4.90 mN•m
(more than 50 g•cm)
(more than 0.7 oz•inch)
SECTION 5

ELECTRICAL ADJUSTMENTS

PRECAUTION
1. Specified voltage: 1.3 V (DC)
2. Setting
MB : OFF
AVLS : OFF
BL SKIP : OFF
MODE : s
VOLUME : MAX
HOLD : OFF
TAPE DECK SECTION
TEST TAPE
Type Signal
WS-48A 3 kHz, 0 dB
TAPE SPEED ADJUSTMENT
Setting:
Function: TAPE
Test tape
WS-48A
(3 kHz, 0 dB)
set
Procedure:
1. Playback WS-48A (tape center) in the FWD state.
2. Adjust RV601 so that the frequency counter reading becomes
3,000 Hz.
Specification Values: 2,970 to 3,030 Hz
3. Check that deflection of the frequency counter reading between
the beginning and the end of tape is within 1.5% (approx.45
Hz).
4. Playback WS-48A (tape center) in the REV state.
Check that the frequency counter reading is within 2%
(approx.60 Hz) of the reading of step 1.
Adjustment Location: MAIN BOARD (See page 13)
0 dB=0.775 V
Used for
Tape Speed Adjustment
frequency counter
16 Ω
+
–
i jack (J301)