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Color Bar Signal Generator

PAL Color bar signal with 100% white level (EBU color bar signal)

Oscilloscope

Vertical sensitivity

: 5 mV/DIV, external trigger

Bandwidth

: more than 10 MHz

Oscilloscope Probe

Input capacity

: less than 25 pF (10:1)
  less than 40 pF (1:1)

Covering frequency

: DC ~ 40 MHz (10:1)
  DC ~30 MHz (1:1)

Digital Voltmeter

DC range

Alignment Tape

KRV-51P (8-192-605-36)

: SP mode, color bar, 400 Hz

(Color bar signal waveform is described below. Refer to Fig. 2-2-1)

Relay Jig

J-6090-036-A

: 7-wire flat cable for VP-1 PWB assembly (SLV-L45AR)

J-6090-019-A

: 12-wire flat cable for VP-1 PWB assembly
  (SLV-L65HFAR/L75HFAR)

Connect the flat cable end from the cylinder assembly to
the VP-1 PWB assembly using the relay jig to provide
simple repairing of the VP-1 PWB assembly, as shown in
Fig. 2-2-3. Further, when adjusting the VP-1 PWB assem-
bly, be sure to make contact an end of shield case with
bracket of the VP-1 PWB assembly to maintain the shield
effect. If the VP-1 PWB assembly does not contact, there
is insufficient ground and no proper play back image can
be obtained.

Color bar signal waveform (KRV-51P)

Color bar pattern (KRV-51P) on monitor TV

VP-1 PWB Assembly

Flat Cable

Cylinder
Assembly

• Prior to making these adjustments, the other adjustments

except the MTS Decoder should be completed.

TV Multichannel Sound Generator

LMS-238 (Prodused by Leader Electonics Corp.)

Oscilloscope

Standard Audio Signal Generator (SG)

Frequency Counter

Input frequency

: 20 Hz ~ 10MHz

AC Voltmeter

DC Voltmeter

DC Power Supply Unit

Voltage

: 0 ~ 15 V (DC)

Band Path Filter

200 Hz ~ 15 kHz

CP-1 PWB (Foil side)

VR351

VR631

TP633

VR634

VR632

VR635

VR633

TP631

TP635

TP101

• If adjusting the MTS Decoder Circuit, special equipment

shown in section 2-2-1. is necessary.

• Improper adjustment will cause loss of performance of

stereo sound and bilingual sound detection.

 CH : 1

TV multichannel

E-E mode

 AUDIO OUTPUT    sound generator
   terminal (L)

Oscilloscope

 CH : 2

Band path filter

 AUDIO OUTPUT  (200 Hz ~ 15kHz)
   terminal (R)

VR632 (SEP. LOW)

Minimum level (less than

VR634 (SEP. HIGHT)

15mVp-p)

• Set the INPUT switch on the remote control to TUNER.
• Set the VIF/RF OUTPUT switch on the TV Multichannel

Sound Generator to CH-3 or CH-4. And LEVEL volume
control to push (locked the RF output level).

 TP633

Standard audio

Disconnected

signal generator (SG)

Power cord of

Oscilloscope

VCR

Frequency counter
DC power supply unit

 VR633 (ST.DBX FIL)

Minimum level (Less than 10 mVp-p)

1. Temporary disconnect the power cord of the VCR to set

the power OFF.

2. Apply 5V(DC) to TP630 from the DC power supply unit.
3. Connect the standard audio signal generator and

frequency counter to TP631, and input 22.9 kHz 

±

 50

Hz, –10 

±

 1 dBM sine wave.

4. After confirming TP633 output on the oscilloscope,

adjust VR633 (ST. DBX FIL) so that the output is
brought to its minimum level (less than 10 mVp-p).

 TP635

TV multichannel

E-E mode

   sound generator
DC voltmeter

 VR635 (VCO)

–

1. Input the output signal of the TV multichannel sound

generator into the VCR ANT input terminal.

2. Set the TV multichannel sound generator as follows.

   SAP switch : OFF, INT FREQ switch : 300 Hz,
   STEREO switch : L + R, VIF/RF OUTPUT : CH-3 or CH-4.

3. Receive the signal of TV multichannel sound generator.

and confirm so that the “ L + R ” within the monitor TV

when PILOT switch to ON.

4. Set OFF the pilot switch of the TV multichannel sound

generator, then measure the DC output voltage of
TP635 and write the value down.

5. Set ON the pilot switch and confirm that “ ST ” within

the indicator panel lights. If not, adjust VR635 (VCO)
until “ ST ” lights.

6. Measure the output voltage of TP635, and adjust

VR635 (VCO) so that the output voltage agree with the
value (within 

±

 0.03 V) measured in step 3.

1. Input the output signal of the TV multichannel sound

generator into the VCR ANT input terminal.

2. Set the TV multichannel sound generator as follows.

SAP switch : OFF, EXT (MONO) switch : ON.

3. Input 300 

±

 50 Hz sine wave into the EXT INPUT terminal

of the TV multichannel sound generator from the standard
audio signal generator.

4. Connect the AC voltmeter to the EXT INPUT terminal, and

adjust the output level of the standard audio signal
generator so that the input voltage becomes 343.7 

±

 1

mVrms (terminated at 600

Ω

).

5. Adjust the VR631 (INPUT LEVEL) so that the AC voltme-

ter connected to TP631 becomes 100 

±

 5mVrms.

 TP631

TV multichannel

E-E mode

   sound generator
Standard audio
   signal generator
AC voltmeter

 VR631 (INPUT LEVEL)

100 

±

 5 mVrms

1. Input the output signal of the TV multichannel sound

generator into the VCR ANT input terminal.

2. Connect the oscilloscope to the AUDIO OUTPUT terminal

(L) and (R) of the VCR via the BPF.

3. Set the TV multichannel sound generator as follows.

     SAP switch : OFF, PILOT switch : ON.

4. Receive the signal of TV multichannel sound generator,

and confirm so that the “ L + R ” within the monitor TV
when PILOT switch to ON.

5. Set the TV multichannel sound generator (STEREO switch :

Rch, INT FREQ switch : 3 kHz), and adjust VR632 (SEP.
LOW) so that the output of the AUDIO OUTPUT terminal
(L) is brought to its minimum level (less than 15 mVp-p)
during Rch modulation.

6. Set the TV multichannel sound generator (STEREO switch :

Lch, INT FREQ switch : 300 Hz), and adjust VR634 (SEP.
HIGH) so that the output of the AUDIO OUTPUT terminal
(R) is brought to its minimum level (less than 15 mVp-p)
during Lch modulation.

1

STEREO

300Hz

approx.

300Hz

approx.

(“ ST ”  indicator lights)

sine

240 mVp-p

sine

15 mVp-p

wave

wave

2

MONO

300Hz

approx.

300Hz

approx.

(NO indicators)

sine

120 mVp-p

sine

120 mVp-p

wave

wave

3

SAP

300Hz

approx.

300Hz

approx.

(“ SAP ”  indicator lights)

sine

120 mVp-p

sine

180 mVp-p

wave

wave

4

SAP

300Hz

approx.

(“ SAP ”  indicator lights)

–

sine

180 mVp-p

wave

7. Set the TV multichannel sound generator (STEREO switch :

Lch, INT FREQ switch : 3 kHz), and confirm that the
difference between the AUDIO OUTPUT terminal (L)
and (R) is more than 25 dB.

8. Set the TV multichannel sound generator (STEREO switch :

Rch, INT FREQ switch : 300 Hz), and confirm that the
difference between the AUDIO OUTPUT terminal (L)
and (R) is more than 20 dB. If not, repeat steps 5 to 8.

Note : Measurement of steps 5 through 8, be sure to

connect the BPF between oscilloscope and AUDIO
OUTPUT terminals.

1. Input the output signal of the TV multichannel sound

generator into VCR ANT input terminal. Set the TV multi-
channel sound generator (INT FREQ switch : 300 Hz,
STEREO switch : L + R, SAP switch : ON, PILOT switch :
ON).

2. Receive the signal of TV multichannel sound generator,

and confirm so that the “ L + R ” within the monitor TV
when PILOT switch to ON.

3. Confirm “ ST ” and “ SAP ” within the VCR indicator panel

lights.

4. Confirm the waveform of the AUDIO OUTPUT terminal (L)

and (R) on the oscilloscope.

5. Set the TV multichannel sound generator as follows.

     PILOT switch : ON, STEREO switch : Lch.

6. Press the VCR PROGRAM button to set ON-SCREEN

MENU, and select the VCR SETUP menu.

7. Confirm that the waveforms of the AUDIO OUTPUT terminal

(L) and (R) become “ No. 1 to 3 ” in the table below when
selecting the MTS mode on the next screen, “ MONO ” 

n

“ STEREO ” 

n

 “ SAP ” sequentially.

8. Set the TV multichannel sound generator (EXT terminal : no

input, EXT (MONO) switch : ON).

9. Confirm that the waveforms of the AUDIO OUTPUT terminal

(L) and (R) become “ No.4 ” in the table below when selecting
the VCR SETUP menu then setting the MTS mode to “ SAP ”.

 CH : 1

TV multichannel

E-E mode

 AUDIO OUTPUT    sound generator
   terminal (L)

Oscilloscope

 CH : 2
 AUDIO OUTPUT
   terminal (R)

–

–