Sony XR-C6090, Руководство по обслуживанию

Страница: 13 / 30

– 13 – – 14 –
SECTION 4
MECHANICAL ADJUSTMENTS
1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head pinch roller
rubber belt capstan
idler
2. Demagnetize the 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 power supply
voltage unless otherwise noted.
•
Torque Measurement
Mode Tension Meter Meter Reading
Forward CQ-403A
more than 90 g
(more than 3.18 oz)
Reverse CQ-403R
more than 90 g
(more than 3.18 oz)
•
Tape Tension Measurement
Mode Torque Meter Meter Reading
Forward CQ-102C
30 - 65 g•cm
(0.42 - 0.90 oz•inch)
Forward
CQ-102C
0.5 - 4.5g•cm
Back Tension (0.01 - 0.06 oz•inch)
Reverse CQ-102RC
30 - 65 g•cm
(0.42 - 0.90 oz•inch)
Reverse
CQ-102RC
0.5 - 4.5g•cm
Back Tension (0.01 - 0.06 oz•inch)
FF, REW CQ-201B
60 - 200 g•cm
(0.83 - 2.78 oz•inch)
SECTION 5
ELECTRICAL ADJUSTMENTS
Tape Speed Adjustment
Setting:
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust adjustment resistor for inside capstan motor so that the
reading on the speed checker or frequency counter becomes in
specification.
Specification: Constant speed
Adjustment Location: See page 14.
set
+ –
test tape
WS-48A
(3 kHz, 0 dB)
speaker out terminal
4
Ω
speed checker
or
frequency counter
Speed checker Frequency counter
–2 to +3% 2,940 to 3,090 Hz
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust RV231 (L-CH) and RV131 (R-CH) so that the level
meter reading is –6±1 dB (0.35 to 0.44 V).
Adjustment Location: See page 14.
Dolby Level Adjustment
Setting:
Preset
3
(DOLBY) button : NR OFF
SEL (BAS) button : Center
SEL (TRE) button : Center
SEL (BAL) button : Center
SEL (FAD) button : Center
SEL (VOL) button : Maximum
D-BASS control : OFF
set
+
–
test tape
P-4-D400
(400Hz, 0dB)
MAIN board
level meter
MAIN board
TP (DOLBY )
TP (GND)



L-CH: IC301
7
R-CH: IC301
@¢
Adjustment Location:
– SET UPPER VIEW –
TP (GND)
S501
POWER SELECT
SWITCH
B (OFF)
↔
A (ON)
R-CH
L-CH TP (DOLBY)
Dolby Level Adjustment



– SET BUTTON VIEW –
Tape Speed Adjustment
RV131
(R-CH) RV231
(L-CH)
Dolby Level
Adjustment
    
TAPE DECK SECTION 0 dB=0.775 V
TUNER SECTION
Tuner Section is no Adjustment.