JVC HR-S2110T, HR-S6700KR, HR-S7800U, HR-S7800UC Service Manual
SERVICE MANUAL
VIDEO CASSETTE RECORDER
HR-S2110T/S6700KR/S7800U/U(C)
MBRSET
CABLE/
DBS
A/B
TV
POWER
TV/VCR
DISPLAY
A. MONITOR
123
2
456
DBS
DAILY(M-F)
WEEKLY
89
7
AUX
C.RESET
4
CANCEL
TIMER
0
START STOP DATE
CH
EXPRESS PROGRAMMING
PROG
PROG SP/EP SKIP SEARCH
1
CHECK
PLAY
F
W
F
E
R
R
T
V
V
O
L
–
C
E
NU
E
M
SHUTTLE
MULTI BRAND
REMOTE CONTROL UNIT
STOP
P
A
U
S
E
3
O
K
H
C
V
+
T
PLUS
+
L
O
V
V
T
–
T
H
V
C
POWER
S-VIDEO
DIGITAL TBC/NR
(MONO)L—AUDIO—RVIDEO
S-VHS ET
SP EP
VCR
Regarding service information other than these sections, refer to the HR-S4800U service manual (No. 82792).
Also, be sure to note important safety precautions provided in the service manual.
REW
MENU
CH
OK
FF
PLAY
REC
PAUSE
STOP/EJECT
SPECIFICATIONS
(The specifications shown pertain specifically to the model HR-S7800U)
GENERAL
Power requirement : AC 120 V` , 60 Hz
Power consumption
Power on : 20 W
Power off : 2.5 W
Temperature
Operating : 5°C to 40°C (41°F to 104°F)
Storage : –20°C to 60°C (–4°F to140°F)
Operating position : Horizontal only
Dimensions (W x H x D) : 400 mm x 94 mm x 281 mm
(15-3/4" x 3-3/4" x 11-1/8")
Weight : 3.5 kg (7.7 lbs)
Format : S-VHS/VHS NTSC standard
Maximum recording time
SP : 210 min. with ST-210 video cassette
EP : 630 min. with ST-210 video cassette
VIDEO/AUDIO
Signal system : NTSC-type color signal and EIA
monochrome signal, 525 lines/60 fields
Recording/
Playback system : DA-4 (Double Azimuth) head helical
scan system
Signal-to-noise ratio : 45 dB
Horizontal resolution
VHS : 230 lines
S-VHS : 400 lines
Frequency range
Normal audio : 70 Hz to 10,000 Hz
Hi-Fi audio : 20 Hz to 20,000 Hz
Input/Output : RCA connectors (IN x 2, OUT x 1)
S-video connectors (IN x 2, OUT x 1)
TUNER
Tuning system : Frequency-synthesized tuner
Channel coverage
VHF : Channels 2–13
UHF : Channels 14–69
CATV : 113 Channels
RF output : Channel 3 or 4 (switchable; preset
to Channel 3 when shipped) 75 Ω,
unbalanced
TIMER
Clock reference : Quartz
Program capacity : 1-year programmable timer/
8 programs
Memory backup time : Approx. 3 min.
ACCESSORIES
Provided accessories : Infrared remote control unit,
“AA” battery x 2,
Audio/video cable,
RF cable (F-type),
S-video cable (4-pin),
S-VHS ET labels,
Controller
Specifications shown are for SP mode unless specified otherwise.
E. & O.E. Design and specifications subject to change without notice.
This service manual is made from all recycled paper.
COPYRIGHT © 2000 VICTOR COMPANY OF JAPAN, LTD.
No. 82806
May 2000
TABLE OF CONTENTS
DIFFERENT TABLE .................................................................................................................................................................................... 1 to 5
3. ELECTRICAL ADJUSTMENT (3-1 to 3-7)
3.1 PRECAUTION ........................................................................................................................................................................................ 3-1
3.2 SERVO CIRCUIT ................................................................................................................................................................................... 3-2
3.3 VIDEO CIRCUIT .................................................................................................................................................................................... 3-2
3.4 AUDIO CIRCUIT .................................................................................................................................................................................... 3-4
3.5 DEMODULATOR CIRCUIT .................................................................................................................................................................... 3-5
3.6 SYSCON CIRCUIT ................................................................................................................................................................................ 3-7
4. CHARTS AND DIAGRAM (4-1 to 4-12)
4.1 BOARD INTERCONNECTIONS ............................................................................................................................................................ 4-1
4.2 3D DIGITAL/2M SCHEMATIC DIAGRAM .............................................................................................................................................. 4-3
4.3 DEMODULATOR SCHEMATIC DIAGRAM [HR-S6700KR] ................................................................................................................... 4-5
4.4 MAIN,A/C HEAD, S JACK, R.PAUSE, C.BOX AND LOADING MOTOR CIRCUIT BOARDS ............................................................... 4-7
4.5 3D DIGITAL/2M CIRCUIT BOARD ...................................................................................................................................................... 4-10
4.6 DEMODULATOR CIRCUIT BOARD [HR-S6700KR] ........................................................................................................................... 4-11
4.7 REMOTE CONTROL SCHEMATIC DIAGRAM [HR-S2110T/S6700KR] ............................................................................................. 4-12
5. PARTS LIST (5-1 to 5-4)
5.1 CABINET AND CHASSIS ASSEMBLY <M2> ........................................................................................................................................ 5-1
5.2 ELECTRICAL PARTS LIST .................................................................................................................................................................... 5-3
The following table indicate main different points between models HR-S4800U, HR-S7800U, HR-S7800U(C), HR-S6700KR
and HR-S2110T.
ITEM
JOG/SHUTTLE DIAL ON DECK SH/PLAY J/S
POWER VOLTAGE (RATING) 120V,60Hz 110 `220V(60Hz)
POWER PLUG UL,CSA KOREAN SASO
POWER SAVE USED NOT USED
FRONT PANEL COLOR BLACK CHMP
HEAD CLEANER NOT USED USED
RECORDING & PLAYBACK SPEED
DIGITAL 3R NOT USED USED
TBC NOT USED USED
3D-MEMORY NOT USED USED
STEREO DECODER MTS A2(KOREAN) MTS
RF OUT CH [3CH],4CH 13CH
SUMMER TIME ADJ. USED NOT USED
CHILD LOCK USED NOT USED
VCR PLUS+ VCR+C3 G-CODE
AUTO CLOCK USED NOT USED
JUST CLOCK USED NOT USED
CABLE & DBS BOX CONTROL USED NOT USED
Notes : Mark
MODEL
is same as left.
HR-S4800U HR-S7800U HR-S7800U(C) HR-S6700KR HR-S2110T
REC: SP/EP,
PLAY: SP/LP/EP
SP/EP
Mark — is not used.
1
The following table indicate different parts number between models HR-S4800U, HR-S7800U, HR-S7800U(C), HR-S6700KR
and HR-S2110T.
PACKING AND ACCESSORY ASSEMBLY <M1>
REF. MODEL
NO. ITEM
301 PACKING CASE LP30658-013A LP30658-022A LP30658-026A LP30658-029A
306 REMOTE CONTROLLER LP20303-015A LP20878-004B
306A COVER(BATTERY) LP40225-002A LP40610-002A
! 310 INST.BOOK(EN) LPT0348-001A LPT0349-001A ———
! 310 INST.BOOK(FR) ——LPT0349-003A ——
! 310 INST.BOOK(KO) ———LPT0430-001A —
! 310 INST.BOOK(EN.CH) ————LPT0429-001A
313 A/V CABLE PEAC0359-120 ——
314 S CABLE QAM0004-002 QAM0246-002
315 CONTROLLER QAL0095-005 ——
316 WARRANTY CARD ——BT-52004-1 BT-56009-2M —
317 Q.S.SHEET LPT0348-002A LPT0349-002A ——
319 REGIST.CARD BT-51020-2 ———
320 SER.NET CARD ——BT-20071B ——
323 CONNECTION SHEET ——PU36560 ——
HR-S4800U HR-S7800U HR-S7800U(C) HR-S6700KR HR-S2110T
CABINET AND CHASSIS ASSEMBLY <M2>
REF. MODEL
NO. ITEM
! 501 FRONT PANEL ASSY LP10289-019B LP10289-020C LP10289-039B LP10289-042B
501A CASSETTE DOOR LP20868-005A LP20868-017A
501C DISPLAY WINDOW LP20869-023A LP20869-024A LP20869-052A LP20869-060A
! 502 TOP COVER LP10013-021D LP10013-031C
503 TAP SCREW QYTDSF3010M QYTDSF3010R
! 511 BOTTOM CHASSIS LP10108-012B LP10108-016A
! 517 POWER CORD QMPD190-170-K PQ21730N QMP73J0-170
518 CLEANER ASSY ———LP40369-001D
518A CLEANER ROLLER ———PQ46418-1-2
518B CLEANER ———PQ46419-1-2
518C CLEANER ARM ———LP30407-001D
527 WASHER,DRUM QYWW267505Z ——
528 SPACER,DRUM LP30017-21A ——
529 KNOB(JOG) LP30653-001A LP30651-004A
530 KNOB(SHUTTLE) LP30652-001A LP30652-002A
533
SPACER, SHIELD FRAME*LP30002-088A
HR-S4800U HR-S7800U HR-S7800U(C) HR-S6700KR HR-S2110T
Notes : Mark is same as left.
Mark — is not used.
Mark
HR-S4800U was also changed.
*
2
MAIN BOARD ASSEMBLY <03>
REF. MODEL
NO. ITEM
PW1 MAIN BOARD ASSY LPA10089-01B1 LPA10089-06B1 LPA10089-08B1 LPA10089-13A1
IC3001 IC MN101D02HJP MN101D02HAA
IC3004 IC M24C04-BN6 M24C08-BN6
IC5101 IC STR-G6532 STR-G6551 STR-G6532
Q6030 TRANSISTOR ———2SB1218A/QR/-X —
Q6551 TRANSISTOR
Q7201 TRANSISTOR 2SA720/RS/-T ——
D6551 Z DIODE MTZJ10B-T2 — MTZJ10B-T2
D7005 SI DIODE — 1SS133-T2
D7010 LED — SLR-325MC-T
R31 MG RESISTOR NRSA02J-152X NRSA02J-122X
R46 MG RESISTOR NRSA02J-471X NRSA02J-271X
R75 MG RESISTOR — NRSA02J-225X
R111 MG RESISTOR NRSA02J-222X ————
R3029 MG RESISTOR — NRSA02J-0R0X
R3032 MG RESISTOR — NRSA02J-0R0X
R3045 MG RESISTOR — NRSA02J-102X
R3093 MG RESISTOR — NRSA02J-0R0X
R5001 RESISTOR QRZ9046-475Z ——
R5102 RESISTOR QRE141J-300Y QRE141J-100Y QRE141J-300Y
R5104 OMF RESISTOR QRG02GJ-683 QRG02GJ-473 QRG02GJ-683
R5306 MG RESISTOR NRSA02J-563X NRSA02J-823X NRSA02J-563X
R6030 MG RESISTOR ———NRSA02J-332X —
R6032 MG RESISTOR NRSA02J-123X — NRSA02J-123X
R6053 MG RESISTOR NRSA02J-102X —
R6508 MG RESISTOR NRSA02J-0R0X NRSA02J-682X NRSA02J-0R0X
R6509 MG RESISTOR ———NRSA02J-682X —
R6510 MG RESISTOR NRSA02J-0R0X NRSA02J-682X NRSA02J-0R0X
R6511 MG RESISTOR ———NRSA02J-682X —
R6551 MG RESISTOR NRSA02J-271X — NRSA02J-271X
R6552 MG RESISTOR NRSA02J-101X — NRSA02J-101X
R7041 MG RESISTOR — NRSA02J-331X
R7202 RESISTOR QRE141J-471Y ——
R7203 MG RESISTOR NRSA02J-222X ——
R7204 RESISTOR QRE123J-100X ——
C18 E CAPACITOR QEKJ1HM-105 ————
C63 CAPACITOR NCB21EK-104X NCB21EK-473X
C128 MG RESISTOR NRSA02J-0R0X ———NRSA02J-0R0X
C561 E CAPACITOR — QERF1HM-105Z
C3018 TRIM CAPACITOR ———QAT3725-300Z
C3019 CAPACITOR NDC21HJ-180X NDC21HJ-100X
C5004 CAPACITOR QCZ9094-472 QCZ9071-222
C5006 E CAPACITOR QETM2DM-157 QEZ0374-826 QETM2DM-157
C5102 E CAPACITOR QEMT1VM-276 QEMU1VM-276Z QEMT1VM-276
C5103 CAPACITOR QCZ0302-470Z QCZ0302-330Z QCZ0302-470Z
C5304 MF CAPACITOR QFVF1HJ-124Z QFVF1HJ-224Z QFVF1HJ-124Z
C5310 M CAPACITOR QFLC1HJ-183Z — QFLC1HJ-183Z
C6519 CAPACITOR ———NCB21EK-223X —
C6520 CAPACITOR ———NCB21EK-223X —
C7206 E CAPACITOR QEKJ0JM-227Z ——
L7201 P COIL QQL29BJ-101Z ——
X3002 CRYSTAL ———QAX0445-001
S6050 SLIDE SWITCH QSW0460-001 —
! PC5101 IC(PHOTO COUPLER) PS2501-1 PS2561L1-1/WL/
TU6001 TUNER QAU0163-001 QAU0125-001 QAU0177-001
! TB1 TERMINAL BOARD LP20887-002B LP20887-006A LP20887-007A
FW3002
J7101 PIN JACK QNN0288-001 QNN0288-002
! SG5001 SURGE ABSORBER QAF0046-242Z ——
! VA5001 VARISTOR QAF0023-431Z ——
! VA5002 VARISTOR QAF0023-431Z ——
! VA5003 VARISTOR ———QAF0026-621 —
! F5001 FUSE QMF51N2-1R25J1 QMF51E2-2R0
PARA RIBON WIRE QUM022-30A4A4 ——
HR-S4800U HR-S7800U HR-S7800U(C) HR-S6700KR HR-S2110T
2SC1740S/QRS/-T
— 2SC1740S/QRS/-T
Notes : Mark
is same as left.
Mark — is not used.
3
2D DIGITAL BOARD ASSEMBLY <05>
REF. MODEL
NO. ITEM
PW1
2D DIGITAL BOARD ASSY
HR-S4800U HR-S7800U HR-S7800U(C) HR-S6700KR HR-S2110T
LPA10090-01B ————
3D DIGITAL/2M BOARD ASSEMBLY <05>
REF. MODEL
NO. ITEM
PW1
3D DIGITAL/2M BOARD ASSY
HR-S4800U HR-S7800U HR-S7800U(C) HR-S6700KR HR-S2110T
— LPA10105-02A
R.PAUSE BOARD ASSEMBLY <06>
REF. MODEL
NO. ITEM
PW2 R.PAUSE BOARD ASSY LPA10089-01B2 LPA10089-01C2
HR-S4800U HR-S7800U HR-S7800U(C) HR-S6700KR HR-S2110T
DEMOD BOARD ASSEMBLY <14>
REF. MODEL
NO. ITEM
PW1 DEMOD BOARD ASSY PB11076A PB11091A PB11076A
IC1501 IC UPC1852AGT KA2268 UPC1852AGT
Q1501 TRANSISTOR ———2SC1740S/QRS/-T —
Q1502 DIGI TRANSISTOR ———DTC144WSA —
R1501 MG RESISTOR QRE141J-102Y NRSA02J-471X QRE141J-102Y
R1502 MG RESISTOR QRE141J-334Y NRSA02J-102X QRE141J-334Y
R1503 MG RESISTOR QRE141J-124Y NRSA02J-822X QRE141J-124Y
R1504 MG RESISTOR QRE141J-302Y NRSA02J-103X QRE141J-302Y
R1505 MG RESISTOR QRE141J-512Y NRSA02J-473X QRE141J-512Y
R1506 MG RESISTOR QRE141J-333Y NRSA02J-101X QRE141J-333Y
R1507 MG RESISTOR QRE141J-333Y NRSA02J-102X QRE141J-333Y
R1508 MG RESISTOR QRE141J-392Y NRSA02J-273X QRE141J-392Y
R1509 MG RESISTOR QRE141J-122Y NRSA02J-103X QRE141J-122Y
R1510 MG RESISTOR QRE141J-392Y NRSA02J-563X QRE141J-392Y
R1511 MG RESISTOR QRE141J-122Y NRSA02J-562X QRE141J-122Y
R1512 MG RESISTOR ———NRSA02J-332X —
R1513 MG RESISTOR ———NRSA02J-123X —
R1514 MG RESISTOR ———NRSA02J-123X —
R1515 MG RESISTOR ———NRSA02J-562X —
R1516 MG RESISTOR ———NRSA02J-273X —
R1517 MG RESISTOR QRE141J-123Y NRSA02J-103X QRE141J-123Y
R1518 MG RESISTOR ———NRSA02J-102X —
R1520 MG RESISTOR ———NRSA02J-102X —
R1521 MG RESISTOR ———NRSA02J-471X —
VR1501 V RESISTOR ———QVPA606-103Z —
VR1502 TRIM RESISTOR ———QVP0039-683Z —
C1501 CAPACITOR QETC1CM-226Z NCB21EK-473X QETC1CM-226Z
C1502 E CAPACITOR QETC1HM-104Z QEKC1CM-106Z QETC1HM-104Z
C1503 CAPACITOR QETC1HM-105Z NCB21HK-471X QETC1HM-105Z
C1504 E CAPACITOR QETC1HM-475Z — QETC1HM-475Z
C1505 CAPACITOR QETC1HM-225Z NDC21HJ-470X QETC1HM-225Z
C1506 CAPACITOR QETC1HM-104Z NDC21HJ-470X QETC1HM-104Z
C1507 CAPACITOR QFV11HJ-473Z NCB21EK-104X QFV11HJ-473Z
C1508 MF CAPACITOR QETC1HM-474Z QFV11HJ-124Z QETC1HM-474Z
C1509 CAPACITOR QETC1HM-104Z NCB21EK-104X QETC1HM-104Z
C1510 CAPACITOR QETC1HM-105Z NCB21EK-473X QETC1HM-105Z
C1511 E CAPACITOR QETC1HM-105Z — QETC1HM-105Z
C1512 CAPACITOR QETC1HM-105Z NCB21EK-683X QETC1HM-105Z
C1513 E CAPACITOR QETN1HM-335Z QEKC1EM-475Z QETN1HM-335Z
C1514 E CAPACITOR QETN1HM-106Z QEKC1EM-475Z QETN1HM-106Z
C1515 M CAPACITOR QETC1HM-105Z QFLC1HJ-683Z QETC1HM-105Z
C1516 CAPACITOR QETC1HM-106Z NCB21EK-473X QETC1HM-106Z
C1517 E CAPACITOR QETC1HM-106Z QETC1CM-227Z QETC1HM-106Z
C1518 E CAPACITOR QETC1HM-105Z QETC1CM-106Z QETC1HM-105Z
HR-S4800U HR-S7800U HR-S7800U(C) HR-S6700KR HR-S2110T
Notes : Mark is same as left.
Mark — is not used.
4
REF. MODEL
NO. ITEM
C1519 E CAPACITOR ———QETC1CM-106Z —
C1520 E CAPACITOR ———QETC1CM-106Z —
C1521 E CAPACITOR QETC1HM-106Z — QETC1HM-106Z
C1522 E CAPACITOR ———QEKC1CM-106Z —
C1523 CAPACITOR ———NCB21HK-332X —
C1524 E CAPACITOR ———QETC1CM-227Z —
C1526 CAPACITOR ———NDC21HJ-470X —
C1527 CAPACITOR ———NDC21HJ-470X —
C1528 E CAPACITOR ———QEKC1CM-106Z —
C1530 CAPACITOR ———NCB21EK-473X —
L1501 P COIL ———QQL01BJ-680Z —
HR-S4800U HR-S7800U HR-S7800U(C) HR-S6700KR HR-S2110T
SUTTLE BOARD ASSEMBLY <85>
REF. MODEL
NO. ITEM
PW1 SUTTLE BOARD ASSY LPA20006-02A LPA20006-01A
UN7001 JOG SHUTTLE SW PESW0679 QSW0845-001
HR-S4800U HR-S7800U HR-S7800U(C) HR-S6700KR HR-S2110T
C.BOX BOARD ASSEMBLY <92>
REF. MODEL
NO. ITEM
PW3 C.BOX BOARD ASSY LPA10089-01B3 LPA10089-01C3 ——
HR-S4800U HR-S7800U HR-S7800U(C) HR-S6700KR HR-S2110T
5
SECTION 3
ELECTRICAL ADJUSTMENT
3.1 PRECAUTION
The following adjustment procedures are not only necessary
after replacement of consumable mechanical parts or board
assemblies, but are also provided as references to be referred
to when servicing the electrical circuitry.
In case of trouble with the electrical circuitry, always begin a
service by identifying the defective points by using the measuring instruments as described in the following electrical adjustment procedures. After this, proceed to the repair, replacement and/or adjustment. If the required measuring instruments are not available in the field, do not change the
adjustment parts (variable resistor, etc.) carelessly.
3.1.1 Required test equipments
• Color (colour) television or monitor
• Oscilloscope: wide-band, dual-trace, triggered delayed
sweep
• Frequency counter
• Audio level meter
• Signal generator: RF / IF sweep / marker
• Signal generator: stairstep, color (colour) bar [NTSC]
• Recording tape
• Digit-key remote controller(provided)
3.1.2 Required adjustment tools
Jig RCU
PTU94023B
Alignment tape
(SP, stairstep, NTSC)
MHP
Jig RCU
INITIAL MODE
DATA CODE
[Data transmitting method]
Depress the “ ” ( 3 ) button
after the data code is set.
CUSTOM CODE
43: A CODE
53: B CODE
Fig. 3-1-4a Jig RCU
•
Set the switches as shown below unless otherwise
specified on the relevant adjustment chart. The
switches that are not listed below can be set as desired.
If the VCR is not equipped with the functions detailed
below, setup is not required.
AUTO PICTURE/VIDEO CALIBRATION/
OFF
B.E.S.T./D.S.P.C.
PICTURE CONTROL/SMART PICTURE
NORMAL/NATURAL
VIDEO STABILIZER OFF
TBC ON
Digital 3R ON
•
Unless otherwise specified, all measuring points and
adjustment parts are located on the Main board.
•
In the Signal column of the adjustment chart, “Ext. Sinput” means the Y/C separated video signal and “Ext.
input” means the composite video signal input.
LPF
PTU93006
3.1.3
Color (colour) bar signal,Color (colour) bar pattern
s
Color bar signal [NTSC]
White(100%)
White(75%)
100 IRE
1V
40 IRE
Horizontal sync
Yellow
Cyan
Green
Magenta
QI
Alignment tape
(S-VHS SP/EP, color (colour) bar)
MH-1H
s
Red
Burst
Blue
40 IRE
Color bar pattern [NTSC]
(75%)
Green
Magenta
Red
Cyan
White
Yellow
White
Q I Black
100%
3.1.4 Switch settings and standard precautions
The SW settings of the VCR and the standard precautions
for the electrical adjustments are as follows.
When using the Jig RCU, set its custom code to match
•
the custom code of the VCR.
Blue
3.1.5 EVR Adjustment
Some of the electrical adjustments require the adjustment
performed by the EVR system. The Main board assembly
have EEPROMs for storing the EVR adjustment data and user
setups.
Notes:
•
In the EVR adjustment mode, the value is varied with
the channel buttons (+, –). The adjusted data is stored
when the setting mode changes (from PB to STOP,
when the tape speed is changed, etc.). Take care to
identify the current mode of each adjustment item
when making an adjustment.
•
When changing the address setting in the EVR adjustment mode, use the Jig RCU or the remote controller
having numeric keypad with which a numeric code can
be directly input.
The remote control code of the Jig RCU corresponds
to each of the digit keys on the remote controller as
follows.
Digit-key 0 1 2 3 4 5 6 7 8 9
Code 20 21 22 23 24 25 26 27 28 29
•
As the counter indication and remaining tape indication are not displayed FDP during the EVR adjustment
mode, check them on the TV monitor screen.
•
When performing the EVR adjustment, confirm that the
FDP indication is changed to the EVR mode, as shown
below.
3-1
FDP
Fig. 3-1-5a EVR mode
3.2 SERVO CIRCUIT
3.2.1 Switching point
Signal (A1) • Stairstep signal
Mode (B) • PB
Equipment (C) • Oscilloscope
Measuring point (D1) •
External trigger (E) • TP111 (D.FF)
Adjustment part (F) • Jig RCU: Code “5A”
Specified value (G) • 7.5 ± 0.5H [MHP]
Adjustment tool (H) • Jig RCU [PTU94023B]
(A2) • Alignment tape [MHP]
• TBC: OFF
VIDEO OUT terminal (75Ø terminated)
(D2) • TP106 (PB. FM)
(1) Play back the signal (A1) of the alignment tape (A2).
(2) Apply the external trigger signal to D.FF (E) to observe
the VIDEO OUT waveform and V.PB FM waveform at
the measuring points (D1) and (D2).
(3) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(4) Adjust tracking by pressing the channel buttons (+, –) so
that the V.PB FM waveform becomes maximum.
(5) Set the VCR to the Auto adjust mode by transmitting the
code (F) from the Jig RCU. When the VCR enters the
stop mode, the adjustment is completed.
(6) If the VCR enters the eject mode, repeat steps (1) to (5)
again.
(7) Play back the alignment tape (A2) again, confirm that the
switching point is the specified value (G).
Trigger point
Switching point
V.sync
V. rate
(1) Record the signal (A2) in the mode (B1), and play back
the recorded signal.
(2) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(3) Set the VCR to the FWD slow mode.
(4) Transmit the code (F) from the Jig RCU to adjust so that
the noise bar becomes the specified value (G) on the TV
monitor in the slow mode.
(5) Set the VCR to the Stop mode.
(6) Confirm that the noise bar is (G) on the TV monitor in
the slow mode.
(7) Repeat steps (3) to (6) in the REV slow mode.
(8) Repeat steps (1) to (7) in the mode (B2).
Note:
For FWD slow playback, transmit the code “08” from
•
the Jig RCU to enter the slow playback mode, and
transmit the code “D0” for REV slow mode.
3.3 VIDEO CIRCUIT
3.3.1 D/A level
Signal (A1) • Ext. S-input / Ext. input
(A2) • Color (colour) bar signal [NTSC]
(A3) • S-VHS tape
Mode (B) • S-VHS
• EE
Equipment (C) • Oscilloscope
Measuring point (D) •
Adjustment part (F) •
Specified value (G) • 1.00 ± 0.015 Vp-p (reference value)
(Note)
VIDEO OUT terminal (75Ø terminated)
VR1401 (DA Y LEVEL ADJ) [3D board]
(1) Insert the cassette tape (A3) to enter the mode (B).
(2)
Observe the VIDEO OUT waveform at the measuring
point (D).
(3) Check the Y level value when the External S-input (Y/C
separated video signal).
(4) Switch the input signal to the External input (composite
video signal), and adjust the adjustment part (F) so that
the Y level becomes the same value observed in step
(3).
Note:
The specified value (G) is just a reference value to be
•
obtained when the External S-Video (Y/C separated
video) signal is input. In actual adjustment, set it to the
value observed in step (3).
Fig. 3-2-1a Switching point
3.2.2 Slow tracking preset
Signal (A1) • Ext. input
Mode (B1) • S-VHS SP
Measuring point (D) • TV-Monitor
Adjustment part (F) • Jig RCU: Code “71“ or “72”
Specified value (G) • Minimum noise
Adjustment tool (H) • Jig RCU [PTU94023B]
3-2
(A2) • Color (colour) bar signal [NTSC]
(B2) • S-VHS EP
Y level
H. rate
Fig. 3-3-1a D/A level
3.3.2 EE Y level
H. rate
Y level
1 kØ 39 µH 180 µH
120 pF 180 pF
PB. FM
629 [kHz]
PB COLOR
(PB COLOUR)
Signal (A1) • Ext. input
Mode (B) • EE
Equipment (C) • Oscilloscope
Measuring point (D) • Y OUT terminal (75Ø terminated)
EVR mode (F1) • Jig RCU: Code “57”
EVR address (F2) •
Specified value (G) • 1.00 ± 0.03 Vp-p
Adjustment tool (H) • Jig RCU [PTU94023B]
(1)
Observe the Y OUT waveform at the measuring point (D).
(A2) • Color (colour) bar signal [NTSC]
A:11 (Press remote controller “1” key twice)
• Digit-key remote controller
(2) Set the VCR to the EVR mode by transmitting the code
(F1) from the Jig RCU.
(3) Set the EVR address to (F2) by pressing the button of
the digit-key remote controller.
(4) Adjust with the channel buttons (+, –) on the VCR (or on
the remote controller) so that the Y level of the Y OUT
waveform becomes the specified value (G).
(5) Release the EVR mode of the VCR by transmitting the
code (F1) from the Jig RCU again. (When the EVR mode
is released, the adjusted data is memorized.)
Y level
Fig. 3-3-3a PB Y level
3.3.4 REC color (colour) level
Signal (A1) • Alignment tape [MH-1H]
(A2) • Ext. input
(A3) • Color (colour) bar signal [NTSC]
Mode (B1) •S-VHS SP
(B2) • S-VHS EP
Equipment (C) • Oscilloscope
Measuring point (D1) • TP106 (PB. FM)
(D2) • PB color (colour) output of the LPF
External trigger (E) • TP111 (D.FF)
EVR mode (F1) • Jig RCU: Code “57”
EVR address (F2) • A:02 (Press remote controller
“0” and “2” keys)
Specified value (G) • SP: “B” x 125 ± 5%
• EP: “B” x 125 ± 5%
Adjustment tool (H1) • Jig RCU [PTU94023B]
(H2) • Digit-key remote controller
(H3) • LPF [PTU93006] (See Fig. 3-3-4a.)
H. rate
Fig. 3-3-2a EE Y level
3.3.3 PB Y level (S-VHS / VHS)
Signal (A1) • Ext. input
Mode (B1) • S-VHS SP
Equipment (C) • Oscilloscope
Measuring point (D) • Y OUT terminal (75Ø terminated)
EVR mode (F1) • Jig RCU: Code “57”
EVR address (F2) •
Specified value (G) • 1.00 ± 0.03 Vp-p
Adjustment tool (H) • Jig RCU [PTU94023B]
(A2) • Color (colour) bar signal [NTSC]
(B2) • VHS SP
A:11 (Press remote controller “1” key twice)
• Digit-key remote controller
(1) Observe the Y OUT waveform at the measuring point (D).
(2) Record the signal (A2) in the mode (B1), and play back
the recorded signal.
(3) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(4) Set the VCR to the EVR mode by transmitting the code
(F1) from the Jig RCU.
(5) Set the EVR address to (F2) by pressing the button of
the digit-key remote controller.
(6) Adjust with the channel buttons (+, –) on the VCR (or on
the remote controller) so that the Y level of the Y OUT
waveform becomes the specified value (G).
(7) Release the EVR mode of the VCR by transmitting the
code (F1) from the Jig RCU again. (When the EVR mode
is released, the adjusted data is memorized.)
(8) Repeat steps (2) to (7) in the mode (B2).
Fig. 3-3-4a LPF
(1) Connect the adjustment tool (H3) to the measuring point (D1).
(2) Apply the external trigger signal to D.FF (E) to observe the
PB color (colour) waveform at the measuring point (D2).
(3) Play back the signal (A3) in the mode (B1) of the align-
ment tape (A1).
(4) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(5) Adjust tracking by pressing the channel buttons (+, –) so
that the PB color (colour) waveform becomes maximum.
Make a note of the higher PB color (colour) level as “B”
at this time.
(6) Record the signal (A3) in the mode (B1), and play back
the recorded signal.
(7) Set the VCR to the EVR mode by transmitting the code
(F1) from the Jig RCU.
(8) Set the EVR address to (F2) by pressing the button of
the digit-key remote controller.
(9) Adjust with the channel buttons (+, –) on the VCR (or on
the remote controller) so that the higher level channel
becomes the specified value (G) of the note "B" level as
shown in Fig. 3-3-4b. (Adjust before recording, then confirm it by playing back.)
(10)
After adjustment, record the signal (A3) then playing it
back again. At this time, confirm that there is no inverting phenomenon or noise appearing on the playback
screen.
(11)
Release the EVR mode of the VCR by transmitting the
code (F1) from the Jig RCU again. (When the EVR mode
is released, the adjusted data is memorized.)
(12)
Repeat steps (3) to (11) in the mode (B2).
3-3
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