DOWNLOAD Sony XR-C6093SP Service Manual ↓ Size: 988.1 KB | Pages: 34 in PDF or view online for FREE

– 13 –

1. Clean the following parts with a denatured-alcohol-moistened

swab:

playback head

pinch roller

rubber belt

capstan

idlers

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.

•

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)

•

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)

0 dB= 0.775 V

1. The adjustments should be performed in the order given in

this service manual.

2. The adjustments should be performed for both L-CH and

R-CH.

Procedure:
1. Put the set into the FWD PB mode.

2. Turn the screw and check the output peak value.  Adjust the

screw so that the peak value in channels L and R coincides
within 2 dB.

3. Check the phase in the FWD PB mode.

Type

 Signal

 Used for

P-4-A100

10 kHz, –10 dB

head azimuth adjustment

WS-48A

3 kHz, 0 db

tape speed adjustment

level meter

test tape 
P-4-A100
(10 kHz, –10 dB)

set

speaker out terminal

–

+

4 

Ω

screw
position

L-CH
peak

within
2 dB

output
level

L-CH
peak

R-CH
peak

within
2 dB

angle

R-CH
peak

test tape 
P-4-A100
(10 kHz, –10 dB)

L-CH

R-CH

speaker out terminal

oscilloscope

V

H

+ +

–

–

Screen pattern

in phase

good

wrong

45 

°

90 

°

135 

°

180 

°

4 

Ω

4 

Ω

set

– 14 –

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 17.

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

Procedure:
1. Put the set into the FWD PB mode.
2. Adjust RV121 (L-CH) and RV221 (R-CH) so that the level

meter reading is –6 ± 0.5 dB (0.37 to 0.41 V).

Adjustment Location: See page 17.

See the adjustment location from on page 17 for the
adjustment.

Speed checker

Frequency counter

–2 to +3%

2,940 to 3,090 Hz

4. Repeat the above adjustment for the REV PB mode.
5. Check that output level difference between FWD PB mode

and REV PB mode is within 4 dB.

Adjustment Location: PB head

REV         FWD

adjustment screws















+

–

speed checker

or

frequency counter

test tape
WS-48A
(3 kHz, 0 dB)

speaker out terminal

set

4 

Ω

+
–

level meter

MAIN board

L-CH: TP101 (DOLBY-L)
R-CH: TP201 (DOLBY-R)

 



test tape
P-4-D400
(400 Hz, 0 dB)

set

– 15 –

L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.

Specification: Separation more than 26 dB

Adjustment Location: See page 17.

FM Stereo

Level meter

Level meter

signal generator

connection

reading (dB)

output channel

L-CH

L-CH

A

B

R-CH

L-CH

Adjust RV4 on TU1

for minimum reading.

R-CH

R-CH

C

D

L-CH

R-CH

Adjust RV4 on TU1

for minimum reading.

 0 dB=1 µV

When the tuner unit is defective, replace it by a new one be-
cause its internal block is difficult to repair.

 Adjust the tuner section in the sequence shown below.

1. FM Auto Scan/Stop Level Adjustment.
2. FM Stereo Separation Adjustment.
3. MW Auto Scan/Stop Level Adjustment.
4. FM Polar VCO Adjustment.
5. FM Polar Pilot Adjustment.

[SOURCE]

 button: FM 1

Procedure:
1. Tune the set to 98.0 MHz.
2. Connect the digital voltmeter to TP (SD) on MAIN board.
3. Adjust RV2 on TU1 so that the reading on the digital voltme-

ter changes point from low to high.

Adjustment Location: See page 17.

[SOURCE]

 button: FM 1

+
–

TP (SD)

MAIN board







digital 
voltmeter

FM RF signal 

generator

dummy

antenna

Carrier frequency : 98.00MHz
Output leve

: 20 dB (10.0 

µ

V)

Mode

: mono

Modulation

: 1 kHz, 22.5 kHz deviation (30 %)

antenna
terminal

set

50 

Ω

50 

Ω

+
–

FM RF signal 

generator

dummy

antenna

Carrier frequency 
Output level         
Mode                   
Modulation          

: 98.00MHz
: 70 dB (3.2 mV)
: stereo
: main : 1 kHz, 20 kHz deviation (26.7 %)
  sub : 1 kHz, 20 kHz deviation (26.7 %)
  pilot : 19 kHz, 7.5 kHz deviation (10 %)
 

antenna
terminal

set

50 

Ω

50 

Ω

4 

Ω

level 

meter

speaker out terminal

– 16 –

[SOURCE]

 and 

[MODE]

 button: MW

Procedure:
1. Tune the set to 999 kHz
2. Connect the digital voltmeter to TP (SD) on MAIN board.
3. Adjust RV1 on TU1 so that the reading on the digital voltme-

ter changes point from low to high.

Adjustment Location:  See page 17.

[SOURCE]

 button: FM2

Procedure:
1. Tune the set to 69.5 MHz, and set the internal modulation level

of the FM RF signal generator to 10 kHz deviation (20%).

2. Connect the frequency counter to the TP401 (VCO) on MAIN

board.

3. Adjust RV402 so that the reading on the frequency counter

becomes to 31.25 ± 0.1 kHz.

Adjustment Location:  See page 17.

AM RF signal

generator

Carrier frequency : 999 kHz
30% amplitude
modulation by
1 kHz signal
Output level

: 33 dB (44.7 

µ

V)

(50 

Ω

)

set

AM dummy antenna

30 

Ω

15 pF

65 pF

antenna terminal

    

TP401 (VCO)

MAIN board

frequency counter

+

–

set

FM RF signal

generator

antenna terminal

Carrier frequency : 69.5 MHz
Output level          : 66 dB (1.995 mV)

+
–

TP (SD)

MAIN board







digital 
voltmeter

[SOURCE]

 button: FM2

Procedure:
1. Connect the level meter to the TP402 (PLT) on MAIN board.
2. Set the modulation frequency of the FM RF signal generator

to 1 kHz, 40 kHz deviation (80 %)

3. Then output level is supposing that (A) dB.
4. Set the modulation frequency of the FM RF signal generator

to 31.25 kHz, 10 kHz deviation (20%)

5. Adjust L401 so that the reading on the level meter becomes to

maximum.

6. Adjust RV401 so that the reading on the level meter becomes

to (A) + 13.0 dB ± 0.5 dB.

Adjustment Location: See page 17.

set

FM RF signal

generator

antenna terminal

Carrier frequency : 69.5 MHz
Output level          : 66 dB (1.995 mV)

    

TP402 (PLT)

MAIN board

level meter

+

–