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– 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 – 4.5 g•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 – 4.5 g•cm

Back Tension

(0.01 - 0.06 oz•inch)

FF, REW

CQ-201B

60 – 200 g•cm

(0.83 – 2.78 oz•inch)

<Set the Test Mode>
1. Set the “power select” switch (S501) is “A (ON)” position.
2. Turn ON the regulated power supply. (All LEDs on the set

lights up, and the clock is displayed)

 Press the 

[OFF]

 button, if the clock is not displayed.

3. Push the preset 

[4]

 button.

4. Push the preset 

[5]

 button.

5. Press the preset 

[1]

 button for more than two seconds.

6. Then the display indicates all lights, the test mode is set.

<Release the Test mode>
1. Push the [OFF] button.
2. Return the “power select” switch (S501) to initially set posi-

tion.

See the adjustment location from on page 14 for the
adjustment.

0 dB=0.775 V

Speed checker

Frequency counter

–1.5 to +2.5%

2,955 to 3,075 Hz

set

+

–

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

AUDIO OUT jack (J331)

10 k

Ω

speed checker

or

frequency counter

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.

– 14 –

 0 dB=1 µV

The tuner section has no adjustment.

– SET UPPER VIEW –

Tape Speed Adjustment

– 15 –

• X

: parts extracted from the component side.

• Y

: parts extracted from the conductor side.

• b

: Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

Caution:
Pattern face side:

Parts on the pattern face side seen from

(Conductor Side)

the pattern face are indicated.

Parts face side:

Parts on the parts face side seen from

(Component Side)

the parts face are indicated.

Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted.  pF: µµF

50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in 

Ω

 and 

1

/

4

 

W or less unless otherwise

specified.

•

C

: panel designation.

•

U

: B+ Line.

• Power voltage is dc 14.4V and fed with regulated dc power

supply from ACC and BATT cords.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.
no mark : FM
(

) : AM

〈〈

 

〉〉

: TAPE PLAYBACK

∗

: Impossible to measure

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal produc-
tion tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc-
tion tolerances.

• Circled numbers refer to waveforms.
• Signal path.

F

: FM

f

: AM

E

: TAPE PLAYBACK

L

: BUS AUDIO IN

– 16 –

1

IC21 

1

 (XT OUT)

2

IC501 

!∞

 (XT IN)

3

IC501 

!£

 (OSC IN)

0.2 Vp-p

97.6 ns

1.7 Vp-p

30.5 

µ

s

1.3 Vp-p

54.2 ns

2.7 Vp-p

27 

µ

s

1

IC901 

^º

 OSC