GOLDSTAR KF14U30, KF20U30, KF21U30 Service manual & schematics

General Information

TV/VCR Combination Unit

Chassis MC-48A

Also Covers: KY-20V30

Matrix

Item See Model Book

Deck Mech Alignment .................................................................................. D-17 Mech Video 4

Deck Mech Adjustment................................................................................ D-17 Mech Video 4

Recommended Safety Parts

Item Part No. Description

C801 181-017A C,MPP AC250V 0.1UF M
C802 181-017A C,MPP AC250V 0.1UF M
C812 181-120G CAPACITOR ACT 4KV E 472M FL10
C813 181-120G CAPACITOR ACT 4KV E 472M FL10
F801 131-098B FUSE 4A/250V HBC TIME DELAY 5X20
F851 131-096E FUSE MICRO 125V 4.0A
IC1801 0ISK670700B IC,SANKEN STR/S6707(LF.953) 9P (R5,R6)
L503 0LA0392K119 INDUCTOR 39UH K
L802 150-F06K COIL LINE FILTER SQE2930 60MH
T801 151-A10C TRANSFORMER SMPS COIL EER4445 STR-S6707 W
FR702 0RF0470H609 R,FUSIBLE 0.47 1/2W 5
FR703 0RF0101J607 R,FUSI8LE 1 1W 5%
FR704(14") 0RF0201K607 R,FUSIRLE 2 2W 5%
FR704(20") 0RF0121K607 R,FUSIBLE 1.20 2W 5%
FR705 0RF0470J607 R,FUSIBLE 0.47 1W 5%
FR706 0RF0470H609 R,FUSIBLE 0.47 1/2W 5
FR852 0RF0470J607 R,FUSIBLE 0.47 1W 5%
FR854 0RF0470J607 R,FUSIBLE 0.47 1W 5%
R813 180-C01C RESISTOR RC 1/2W 8.2M K TA52
SW801 140-289A SWITCH SDDF3PASP013(GS-ALPS) TV8

Adjustments

Alignment Procedures

1. It is safe to adjust after using insulating
transformer between the power supply line
and chassis input to prevent the risk of
electric shock and protect the instrument.

2. Never disconnect leads while the TV receiver
is on.

3. Don’t short any portion of circuits while power
is on.

4. The adjustment must be done by the correct
appliances. But this is changeable in view of
productivity.

5. Unless other-wise noted, set the line voltage
to 220V ±10%, 50/60Hz.

Test Equipment required

1. Color signal generator: PAL/SECAM

2. Digital multi-meter

3. White balance meter

RF AGC adjustment
(at the MAIN PCB of VCR)

Test point : TP AGC (W718)
Adjust : VR771

The RF AGC control (VR771) was aligned at the

time of manufacture for optimum preformance
over a wide range conditions. Readjust of
VR771 should not be necessary unless unusual
local conditions exist, such as;

1) Channel interference in a CATV system.

2) Picture bending and I or color beats, which
are unusually due to excessive RF signal
input when the receiver is too close to a
transmitting tower or when the receiver is
connected to an antenna distribution system
where the RF signal has been amplified. In
this case the input signal should be attenu­ated (with a pad or filter) to a satisfactory
level.

3) Picture noise caused by “broadcast noise” or
weak signal. If the broadcast is “clean” and
the RF signal is at least lmV (60dBu) the
picture will be noise free in any area.

Adjusting the VR771(RF AGC) control to one
end of rotation will usually caused a relatively
poor signal to noise ratio;
Adjusting to the other end of rotation will usually
cause a degradation of overload capabilities
resulting in color beats or adjacent channel
reference.
For best results, adjust the VR771 control while
preforming on all other local channels, or the
voltage at TP AGC (W718) will be 5.5±0.1VDC.

Note: TP AGC (W718) VR771 are located
inside VCR unit. Refer to below fig A.

1GOLDSTAR KY-14V30

Fig. A
Focus adjustment

Test point : Observe Display
Adjust : Focus control of FBT

1) Set color to minimum, brightness and
contrast to maximum.

2) Tune the TV set to an inactive channel
station.

3) Adjust the focus control for best overall focus.

Screen & white balance (colour temperature)
adjustment

Note: The colour bias controls (VR901, VR902,

VR903) affect the low light (dark) area of the
picture while the color drive controls (VR904,
VR905) affect the high light (white) areas.

1) Tune the standard white signal, set the colour
and brightness, contrast to the normal
position.

2) Turn the screen VR counter-clockwise and
set it to the minimum position.

3) Set the VR901, 902, 903, 904, 905 on the
CPT Board to the mechanical center position.

4) Press CUTOFF button on service remote
controller. (That is to obtain a horizontal line)

5) Turn the screen VR clockwise slowly to obtain
a first horizontal line on screen.

6) Adjust Two Bias VR (two of three, VR901,
902, 903) so that the horizontal line on screen
may become white.

7) Turn the screen VR adjust horizontal line on
screen just disappear point.

8) Press again CUTOFF button on service
remote controller, then TV screen returns
normal status.

9) Receive the adjust pattern white and black
signal.

10)Adjust VR904 (RED Drive) and VR905 (Blue
Drive) high light on screen may become
white.

11)By using color analyzer (white balance
checker), adjust X position equals to 281±2
and Y position equals to 288±2, it means
color temperature is 10000˚ ±800˚K at low
light (4.5ft.L) at high light (over 45ft.L)

12)Adjust Contrast and Birghtness and then
conform whether you have a considerable
adjustment in a high and low light screen,
otherwise, re-adjust above item 4)-11).

Vertical size adjustment

1) Tune the TV set to receive a digital test
pattern.

2) Adjust VR301 so that the circle of a digital
pattern may be located within the effective
screen of CPT.

Vertical/Horizontal/SECAM Adjustment
NOTE: These adjustments are already aligned

at the time of manufacture for optimum perform­ance. Readjust of them should not be necessary
unless IC503(EEPROM) is defective. Because
all the information of these adjustment are
memorized in that IC.

Adjustment procedures

1) Tune the TV set to receive a digital pattern
unless otherwise noted.

2) Press SVC button on service remote control­ler then you can find On Screen Display.
Refer to the following fig. B.

3) Press PR+ or PR- button for desirous function
adjustment.

4) Press VOL + or VOL- button for correct
picture.

LINE SVC 1 PR1
H-CENT 14
V-CENT 04
SUB BRIGHT 00
SUB CONTRAST 00
SECAM BELL 04
SECAM R-Y 08
SECAM B-Y 08
SECAM AMP 03

Fig. B
Horizontal centre adjustment

Adjust so that the horizontal center line of digital
pattern is in accord with gemetric horizontal
center of the CPT.

Vertical centre adjustment

Adjust so that the vertical center line of digital
pattern is in accord with geometric center of the
CPT.

SECAM BELL filter adjustment

1) Tune the TV set to receive a SECAM digital
pattern.

2) Adjust so that the color on the 3.8MHz pattern
is minimized.

SECAM B-Y/R-Y adjustment

1) Tune the TV set to receive a SECAM digital
pattern.

2) Adjust so that the background color is equal
to the PAL background color.

SECAM AMP adjustment

1) Tune the TV set to receive a SECAM digital
pattern.

2) Adjust so that the level of SECAM color is
equal to the level of PAL color.

Adjustments (VCR)

1. VCO (Voltage controlled oscillator) Adjustment.

a. Connect the measuring equipments to the set

as shown Fig 1.

Fig. 1

b. Adjust T702 so that the level of picture carrier

(38.0MHz) maker point may be the oscillation
position as shown on Fig 2.

NOTE: SW1 - Vco Adjustment: ON

- AFT Adjustment: OFF

Waveform

Fig. 2

2. AFT Adjustment

a. Connect the measuring equipments to the set

as shown Fig 1.

b. Adjust T703 so that the level of picture carrier

(38.0MHz) marker point may be the center
position as shown Fig 3.

Waveform

Fig. 3

3. SIF Adjustment

Measurement Point TPSIF
Adjustment Point T701
Specification 5.5V± 0.2V

a. Connect the measuring equipments to the

shwon Fig 4. b. Adjust T701 so that the DC
voltage 5.5V ± 0.2V

Fig. 4

4. RF AGC Adjustment

Measurement Point TP AGC (W799)
Adjustment Point VR771
Specification DC 5.5V± 0.1V

a. Receive the VHF Band 11CH(175.25MHz) ;

60dBuv± 1dBu.

b. Connect the Digital Multimeter to TP AGC

(W799).

c. Adjust VR771 so that may be DC5.3V± 0.1V.

5. Servo Circuit Adjustment

1. Necessary Instrunents and Components

a. Oscilloscope: lEA
b. PAL Test Tape (sp): lEA

2. ±PG Adjustment

Adjustment Point VR201
Measurement Point H.SW VIDEO OUT

(W403)

Specification 416 ± 10usec
a. Playback a PAL-SP Test Tape.

b. Connect CH-1 of oscilloscope to W250 and

CH-2 to Video Out.

c. Trigger H.SW of CH-1 to composite video

signal.

d. Adjust VR 201 so that the time difference of

between A (B) Head part to H.SW signal and
vertical synchronizing signal may be 6.5(H)
(416 S, 1H=64 S)

e. Using Polarity Invert Knob, change A/B Head

sw signal.

Waveform

Fig. 5

6. Y/C Circuit Adjustment

1. Necessary Instruments and Components

a. Dual Type of SECAM/L and PAL B/G
b. Oscilloscope (above 10MHz, 2mV)
c. Video Signal Generator (Dual Type of SECAM

and PAL)

d. Standard Play Back Tape (Color Bar of 100%

White) SECAM or PAL
e. Recording Tape
f. Blank Tape

2. Adjustment

1) EE Level Adjustment

Mode STOP
Measurement Point VIDEO OUT (W403)
Adjustment Point VR305 EE LEVEL
Specification 2±0.1Vp-p

a. Connect CH-1 of oscilloscope to VIDEO OUT.
b. Input the Video Signal of 100% white to Video

Input Jack.
c. Adjust VR305 so that the value of between

Syn. terminal and 100% white may be 2±0.1

Vp-p.

Waveform

Fig. 6

2) FM Carrier Frequency Adjustment

MODE REC
Measurement Point C306(REC-FM)
Adjustment Point VR304
Specification White Peak

4.8±0.05MHz
Sync Tip 3.8± 0.05MHz

Adjustments / (VCR) / (VCR) Cont’d / Safety Parts / Troubleshooting (TV) / (TV) Cont’d / Troubleshooting (VCR) / (VCR) Cont’d (1) / (VCR) Cont’d (2) / Head Amp Diagram / TV Diagram

Audio (VCR) Diagram / Connection Diagram / CRT Diagram / Key PCB Diagram / Power Supply (VCR) Diagram / Remote Handset / Y/C Diagram / Tuner IF Diagram / Servo Diagram

GOLDSTAR KY-14V30

2

Adjustments (VCR) Cont’d

a. Connect by reffering to Fig 8. (But, the set

and Modem Test must be connected by a 1:1
probe.)

b. Input the Video signal of 100% white to Video

Input Jack.

c. Set the terminal position of Modem Test to

ATT 0dB and operate it to be PAL/SECAM
Mode, Demod and Marker On.

d. Adjust VR304 so that 3.8MHz Marker on

Scope may coincide with the lower step of
sync.

Fig. 7

NOTE: The connection Diagram and waveform

are same as those of FM carrier Frequency
Adjustment.

4) Play Back Luminance Level Adjustment

Mode PLAY
Measurement Point VIDEO OUT (W403)
Adjustment Point VR303
Specification 2 ± 0.1 Vp-p

a. Connect CH-1 of oscilloscope to VIDEO OUT.
b. Play a standard Tape for sp with 100% white

signal.

c. Adjust VR303 so that the Video waveform

may be 2 ± 0.1Vp-p.

Fig. 9

7. Audio Circuit Adjustment

1. Necessary Instruments and Components.

a. D.C Power Supply
b. Audio Signal Generator (SSG)
c. Level Meter
d. Frequency Counter
e. Oscilloscope

Troubleshooting Guides (TV)

Fig. 8

3) FM Deviation Frequency Adjustment

Mode REC
Measurement Point C306(REC-FM)
Adjustment Point VR301
Specification 1±0.1MHz

2. Adjustment

1) REC Detection Frequency Adjustment

Specification 70KHZ ± 5KHZ
Measurement Point PMJ01 8PIN
Mode Recording the

Recording/Tape

Adjustment Point T401
a. Connect the frequency counter of detection

frequency to PMJ01 8PIN (70KHZ ± 5KHZ).
b. Adjust T401 so that it may be 70KHZ ±
5KHZ.

2) REC Bias current Adjustment

Specification 2.5mV
Measurement Point R400
Mode Recording the

Recording/Tape

Adjustment Point VR401
a. Connect the level Meter terminal to R400 and

check the detection voltage is 2.5mV.

b. Adjust VR401 so that it may be 2.5mV.

End.

a. Connect by reffering to figure 8. (But, the Set

and Modem Test is connected by a 1:1 probe.)

b. Input Video Signal of 100% white to Video

Input Jack.

c. Set the terminal position of Modem Test to

ATT 0dB and operate it to be PAL/SECAM
Mode, Demod and Marker On.

Adjustments / (VCR) / (VCR) Cont’d / Safety Parts / Troubleshooting (TV) / (TV) Cont’d / Troubleshooting (VCR) / (VCR) Cont’d (1) / (VCR) Cont’d (2) / Head Amp Diagram / TV Diagram

Audio (VCR) Diagram / Connection Diagram / CRT Diagram / Key PCB Diagram / Power Supply (VCR) Diagram / Remote Handset / Y/C Diagram / Tuner IF Diagram / Servo Diagram

Troubleshooting Guides

(TV) Cont’d

3GOLDSTAR KY-14V30

Troubleshooting Guides (VCR)

Adjustments / (VCR) / (VCR) Cont’d / Safety Parts / Troubleshooting (TV) / (TV) Cont’d / Troubleshooting (VCR) / (VCR) Cont’d (1) / (VCR) Cont’d (2) / Head Amp Diagram / TV Diagram

Audio (VCR) Diagram / Connection Diagram / CRT Diagram / Key PCB Diagram / Power Supply (VCR) Diagram / Remote Handset / Y/C Diagram / Tuner IF Diagram / Servo Diagram

GOLDSTAR KY-14V30

4

Troubleshooting Guides (VCR) Cont’d

Adjustments / (VCR) / (VCR) Cont’d / Safety Parts / Troubleshooting (TV) / (TV) Cont’d / Troubleshooting (VCR) / (VCR) Cont’d (1) / (VCR) Cont’d (2) / Head Amp Diagram / TV Diagram

Audio (VCR) Diagram / Connection Diagram / CRT Diagram / Key PCB Diagram / Power Supply (VCR) Diagram / Remote Handset / Y/C Diagram / Tuner IF Diagram / Servo Diagram

Troubleshooting Guides (VCR) Cont’d

5GOLDSTAR KY-14V30

Head Amp

Diagram

Adjustments / (VCR) / (VCR) Cont’d / Safety Parts / Troubleshooting (TV) / (TV) Cont’d / Troubleshooting (VCR) / (VCR) Cont’d (1) / (VCR) Cont’d (2) / Head Amp Diagram / TV Diagram

Audio (VCR) Diagram / Connection Diagram / CRT Diagram / Key PCB Diagram / Power Supply (VCR) Diagram / Remote Handset / Y/C Diagram / Tuner IF Diagram / Servo Diagram

GOLDSTAR KY-14V30

6

TV Diagram

Adjustments / (VCR) / (VCR) Cont’d / Safety Parts / Troubleshooting (TV) / (TV) Cont’d / Troubleshooting (VCR) / (VCR) Cont’d (1) / (VCR) Cont’d (2) / Head Amp Diagram / TV Diagram

Audio (VCR) Diagram / Connection Diagram / CRT Diagram / Key PCB Diagram / Power Supply (VCR) Diagram / Remote Handset / Y/C Diagram / Tuner IF Diagram / Servo Diagram

7GOLDSTAR KY-14V30

Audio (VCR) Diagram

Connection

Diagram

Power Supply (VCR) DiagramCRT Diagram

Adjustments / (VCR) / (VCR) Cont’d / Safety Parts / Troubleshooting (TV) / (TV) Cont’d / Troubleshooting (VCR) / (VCR) Cont’d (1) / (VCR) Cont’d (2) / Head Amp Diagram / TV Diagram

Audio (VCR) Diagram / Connection Diagram / CRT Diagram / Key PCB Diagram / Power Supply (VCR) Diagram / Remote Handset / Y/C Diagram / Tuner IF Diagram / Servo Diagram

GOLDSTAR KY-14V30

8

Tuner IF Diagram

Remote Handset Diagram

Key PCB Diagram

Adjustments / (VCR) / (VCR) Cont’d / Safety Parts / Troubleshooting (TV) / (TV) Cont’d / Troubleshooting (VCR) / (VCR) Cont’d (1) / (VCR) Cont’d (2) / Head Amp Diagram / TV Diagram

Audio (VCR) Diagram / Connection Diagram / CRT Diagram / Key PCB Diagram / Power Supply (VCR) Diagram / Remote Handset / Y/C Diagram / Tuner IF Diagram / Servo Diagram

9GOLDSTAR KY-14V30

Y/C Diagram

Adjustments / (VCR) / (VCR) Cont’d / Safety Parts / Troubleshooting (TV) / (TV) Cont’d / Troubleshooting (VCR) / (VCR) Cont’d (1) / (VCR) Cont’d (2) / Head Amp Diagram / TV Diagram

Audio (VCR) Diagram / Connection Diagram / CRT Diagram / Key PCB Diagram / Power Supply (VCR) Diagram / Remote Handset / Y/C Diagram / Tuner IF Diagram / Servo Diagram

GOLDSTAR KY-14V30

Servo Diagram

10

Adjustments / (VCR) / (VCR) Cont’d / Safety Parts / Troubleshooting (TV) / (TV) Cont’d / Troubleshooting (VCR) / (VCR) Cont’d (1) / (VCR) Cont’d (2) / Head Amp Diagram / TV Diagram

Audio (VCR) Diagram / Connection Diagram / CRT Diagram / Key PCB Diagram / Power Supply (VCR) Diagram / Remote Handset / Y/C Diagram / Tuner IF Diagram / Servo Diagram