Sony XR-C7500R / XR-C7500RX Service Manual ▷ View online
13
LEVER (LDG-A) / (LDG-B)
GEAR (LDG-FT)
shaft A
shaft B
shaft C
1
Fit the lever (LDG-A) on
shafts A – C and install it.
shafts A – C and install it.
shaft A
shaft B
2
Fit the lever (LDG-B) on
shafts A and B and
install it.
shafts A and B and
install it.
3
type-E stop ring 2.0
gear (LDG-D)
5
gear (LDG-FT)
6
polyethylene washer
2
tension spring (LD-2)
2
tension spring (LD-1)
gear (LDG-FB)
lever (LDG-A)
hole
hole
4
Align hole in the gear (LDG-D)
with hole the lever (LDG-A).
with hole the lever (LDG-A).
3
Move the lever (LDG-B)
in the direction of the arrow .
in the direction of the arrow .
1
14
GUIDE (C)
MOUNTING POSITION OF CAPSTAN/REEL MOTOR (M901)
2
guide (C)
1
three claws
two precision screws
(P2
(P2
×
2)
capstan/reel motor
(M901)
(M901)
30˚
15
SECTION 5
MECHANICAL ADJUSTMENTS
• Tape Tension Measurement
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
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
Torque Meter
Meter Reading
2.95 – 6.37 mN•m
Forward
CQ-102C
(30 – 65 g•cm)
(0.42 – 0.90 oz•inch)
Forward
0.05 – 0.44 mN•m
CQ-102C
(0.5 – 4.5g•cm)
Back Tension
(0.01 – 0.06 oz•inch)
2.95 – 6.37 mN•m
Reverse
CQ-102RC
(30 – 65 g•cm)
(0.42 – 0.90 oz•inch)
Reverse
0.05 – 0.44 mN•m
CQ-102RC
(0.5 – 4.5g•cm)
Back Tension
(0.01 – 0.06 oz•inch)
5.89 – 19.61 mN•m
FF, REW
CQ-201B
(60 – 200 g•cm)
(0.83 – 2.78 oz•inch)
Mode
Tension Meter
Meter Reading
more than 8.83 mN•m
Forward
CQ-403A
(more than 90 g)
(more than 3.18 oz)
more than 8.83 mN•m
Reverse
CQ-403R
(more than 90 g)
(more than 3.18 oz)
SECTION 6
ELECTRICAL ADJUSTMENTS
TEST MODE
This set has the test mode function.
<Set the Test Mode>
1. Turn ON the regulated power supply. (The clock is displayed)
1. Turn ON the regulated power supply. (The clock is displayed)
Note:
Press the
[OFF]
button, if the clock is not displayed.
2. Press the preset
[4]
button.
3. Press the preset
[5]
button.
4. Press the preset
[1]
button for more than two seconds.
5. Then the display indicates all lights, the test mode is set.
<Release the Test mode>
1. Press the
1. Press the
[OFF]
button.
16
Adjustment Location:
– SET UPPER VIEW –
– SET BOTTOM VIEW –
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
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.
Specification: Constant speed
Dolby Level Adjustment
Setting:
[MENU]
button
: ON (light up SET UP and
PLAY MODE)
Preset
[DISC +]
t
[+ ]
(
t) buttons
: NR off
[DSO]
(BAS, TRE) button
: off
[SOUND]
(BAL) button
: Center
[SOUND]
(FAD (Front)) button : Center
[SOUND]
(FAD (Rear)) button
: Center
VOLUME CONTROL dial
: Maximum
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust RV230 (L-CH) and RV240 (R-CH) so that the level
1. Put the set into the FWD PB mode.
2. Adjust RV230 (L-CH) and RV240 (R-CH) so that the level
meter reading is –6±0.5 dB (0.37 to 0.41 V).
set
+
–
–
test tape
P-4-D400
(400Hz, 0 dB)
P-4-D400
(400Hz, 0 dB)
level meter
MAIN board
TP (DOLBY-L)/
TP (DOLBY-R)
TP (DOLBY-R)
0 dB=0.775 V
TAPE DECK SECTION
Speed checker
Frequency counter
–1.5 to +2.5%
2,955 to 3,075 Hz
set
+
–
test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
LINE OUT REAR jack (CN13)
10 k
Ω
speed checker
or
frequency counter
> M
TUX1
Tape Speed Adjustment
RV240
Dolby Level Adjustment (R-CH)
Dolby Level Adjustment (R-CH)
RV230
Dolby Level Adjustment (L-CH)
Dolby Level Adjustment (L-CH)
TP (DOLBY-R)
TP (DOLBY-L)
Dolby Level
Adjustment
Adjustment
TP
(GND)
(GND)
TUNER SECTION
Tuner section adjustments are done automatically in this set.
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