Goldstar P 434 I Manual

GOLDSTAR P 434 I
Matrix
Item
Safety Notes ................................................................................................ P934 I
Service Cables ............................................................................................ P934 I
Mechanism Disassembly ........................................................................... P934 I
Mechanism Adjustments ........................................................................... P934 I
Mechanism Troubleshooting Guides ....................................................... P934 I
Deck Exploded Parts View ........................................................................ P934 I
Electrical Adjustments Reference:
1. Record PG Adjustment is proceed in the
Electronic Test Equipment
Record mode and must be input video signal.
2. The deviation between A/B Head Adjustment
Oscilloscope
location should be within i-0.5H (32usec).
Video Signal Generator
3. The deviation between the specification of
Level Meter
adjustment and the practical measurement
+ Driver
value should be within t-S0usec.
Test Tape (SP)
4. Oscilloscope and VCR set should be con-
Recording Tape
nected with GND.
Digital Multimeter
5. When the Power Assy of set is changed, you
Monitor Scope
should be readjust Record PG.
Power Supply
1-2) Playback PG Adjustment
ABBREVIATIONS
SPEC: Specification
Procedure
M.P: Measurement Point
a. Playback a PAL SP test tape.
A.P: Adjustment Point
b. At this time, the ATR' is lighting, after pressing
the A.TR (+) or A.TR(-) and adjust the X-
1. Servo Circuit
Value.
c. Connect CH-1 terminal of oscilloscope to
1) PG Adjustment
TP302(H.SW) and CH-2 terminal to Video Out
terminal (JK701 pin(1) of VCR.
Purpose:
d. Trigger the complex Video signal of CH2 to
For the phase dividing of the Video A,B heads
CH-1 (H.SW), and adjust VR501 so that the
with 180 and the exact tracing of each track to
distance from A(B) head selection point of
meet head switching point with VHS Spec.
H.SW signal to the starting point of Vertical
synchronized signal is 6.5H (416usec, 1H=
64usec).
e. The conversion of A/B Head SW signal uses
the Polarity Invert Knob of oscilloscope.
Reference:
1. ±PG adjustment is proceed in the state of
maximum RF level and locked servo system
(MTR Mode).
2. The deviation between A/B Head Adjustment
location should be within ±0.5H (32usec).
3. The deviation between the specification of
adjustment and the practical measurement
value should be within ±0.5H (32usec).
Fig. 3-1
4. Oscilloscope and VCR set should be con-
nected with GND.
1-1) Record PG Adjustment
2. Audio Circuit
MODE: Record
SPEC: 416±50usec
1) Record Bias Adjustment
M.P: TP302 (H.SW) JK701 Pin(1) (Video Out)
A.P: VR502
MODE: Record
SPEC: 3.0mW±0.2mV RMS
1-2) Playback PG Adjustment
M.P: W105(+) W106 (-)
A.P: VR401
MODE: Playback
SPEC: 6.5H±0.5H (41 6usec, 1 H=64usec)
Purpose:
M.P: TP302 (H.SW) JK701 pin (Video Out)
This is adjusting the bias current to specification
A.P: VR501
in recording.
1-1) Record PG Adjustment
Procedure:
a. Connect (+) terminal of the Level Meter to
Procedure:
W105 (+).
a. Set the VCR to AN mode.
b. Connect (-) terminal of the Level Meter to
b. Connect CH-1 terminal of oscilloscope to
W106 (-).
TP302 (H.SW) and CH-2 terminal to video out
c. Confirm that the Oscillation Voltage is
terminal (JK701 pin(1) of VCR.
3.0mV±0.2mV RMS.
c. Input the Video signal to Video Input Jack.
d. At this time, adjust VR401 and make the
d. Record in PAL SP mode.
oscillation voltage fit to specification.
e. Trigger the complex Video signal of CH2 to
CH-1 (H.SW), and adjust VR502 so that the
3.Tuner/IF Circuit
distance from A(B) head selection point of H.SW
signal to the starting point of Vertical synchro-
1) VCO (Voltage Controlled Oscillation)
nized signal is 416±50usec.
Adjustment
MODE: PAL I (38.9MHz)
SPEC: DC 2.5±0.1V
M.P: P7M02 pin(5)(AFC CTL)
See Model Book
A.P: T750AFC
(Automatic Frequency Control) (VCO COIL)
6
6 Procedure:
a. Connect as shown in Fig. 3-2.
6
6
6
6
Fig. 3-2.
b. Input the PAL I 38.9MHz (Strength of input
electric field: 75±5dBu) signal Out Terminal of
TV RF Pattern GEN instrument.
c. Confirm that the video signal is Output by
connect oscilloscope to P7M01(2)PlN.
d. Adjust VCO coil T750 so that the voltage of
P7M02 pin (5) became DC 2.5 ±0.1V.
2) RF AGC (Automatic Gain Control) Adjust-
ment
MODE: PAL B/G (E11CH)
SPEC: 5.5±0.1V p-p
M.P: W393
A.P: VR701
Procedure:
a. Be tuning PAL B/G E11CH (216.25MHZ)
(strength of input electric field: 70±1dBu).
b. Connect the Digital Voltmeter to Tuner AGC
PIN.
c. Adjust VR701 so that the digital voltmeter is
5.5 ±0.1Vp-p.
Reference:
Maintain the input gain in adjusting AGC
faithfully.
1
Location Part No.
A43 3721R-F004V
A44 3501R-0278C
A45 3501R-0690A
OR
A45 501-520B
A46 3501R-0263E
250 217-570B
260 315-347B
266 321-738A
267 255-429A
268 255-359A
269 255-362A
270 321-743A
275 340-086A
280 3720R-F009K
283 3580R-0003E
284 442-681A
300 681-142E
320 258-728C
330 220-050A
452 353-051 A
459 353-046A
462 353-136A
Cabinet Exploded View
Cabinet Parts List
Description Specification
PANEL ASSY FRONT
BOARD ASSY SMPS
BOARD ASSY PRE-AMP
MODULE PRE-AMP(P401P)
BOARD ASSY MAIN I
CASE TOP
FRAME MAIN(60HR)
BRACKET ASSY HOUSING
PLATE GND(M/F)
PLATE SIDE GND
PLATE PREAMP GND
BRACKET PROTECT
HOLDER DIGITRON
PANEL FRONT
DOOR CST
SPRING DOOR
CORD H03WH2-F 2-0.75MM(2X0.5MH)
PANEL ASSY DISTRIBUTOR
COVER BOTTOM
SCREW SPECIAL(3X10 FZMY)
SCREW SPECIAL (3X6 FZMY)
SCREW SPECIAL(4.6X12.5 FBK)
U-View Limited