Hitachi VT-FX8000E User manual

HITACHI
. SERVICE MANUAL
(=
f= ©0C_J Geo =
VHS
This video deck is a VHS type video
racorder. For proper operation, only
the VHS type cassette must be used.
TK No.4809E
VT-FX8000E(AU)
VT-FX8000EM(GKI)NA
VT-FX8000EM(HKN)
VT-FX8000EM(JU)
US MECHANISM
This service manual does not include
information on the US Mechanism used
in this model. Use this manual together
with the following manual.
Manual related to the
VT-FX8000E/FX8000EM
Name of manual | Manual No. Shaptere
Included
US Mechanism 4527E | _----->
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
VIDEO CASSETTE RECORDER
August 1998 Image & Information Media Systems Division, Tokai

PRODUCT
AFETY NOTICE
Many electrical and mechanical parts have special safety-related characteristics. These are often not evident from
yisual inspection nor can the protection afforded by them necessarily be obtained by using replacement components
rated for a higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are
identified in this Service Manual. Electrical components having such features are identified by marking with a A\
on the schematics and the parts list in this Service Manual. The use of a Substitiite réplacement component which
does not have the same safety characteristics as the HITACHI recommended replacement one, shown in the parts
list in this Service Manual, may create shock, fire, or other hazards. Product safety is continuously under review
and new instructions are issued from time to time. For the latest information, always consult the current HITACHI
Service Manual. A subscription to, or additional copies for, HITACHI Service Manual may be obtained at a nominal
charge from HITACHI SALES CORPORATION.
CONTENTS
CHAPTER 1 GENERAL INFORMATION
SPECIFICATIONS
COMPARISON OF FEATURES -
COMPARISON OF MAIN CONTROL ICs
TIPS FOR SERVICING
TROUBLE DISPLAY FUNCTION
How to Remove the Cassette when a
Malfunction Has Occurred in the Mechanism
Instructions on Use and Description of New Functions +. 1-6
CHAPTER 2 DISASSEMBLY
1.Before Starting Disassembly
2.Disassembly Method -
Parts Hierarchy Chart
Disassembly Procedure Diagrams
2+1.Top cover, front panel, rear panel,
bottom cover and US-FL mechanism
2-2.Cassette door and buttons ---
2-3.Front frame, LCJ and FST boards
2-4.NCM and N&A, A2 or J&U boards.
2-5.US mechanism/MAS board assembly -
2-6,Separation of MAS board from US mechanism ------- 2-4
2-7,Procedure to remove only the US mechanism
Cautions When Reinstalling the US Mechanism
IC CICUIT AD, ENT AND
CHAPTER 3] TROUBLE DISPLAY. }
Service Position - o
1.Servicing position during electrical adjustment --
2,Servicing positions when repairing and
checking circuits ---
3.Be careful of electric shocks
Electrical Circuit Adjustment ---
1, Test equipment/jigs necessary for adjustment
2.Cautions on adjustment
3.Tips for adjustment --
4.Connections of test equipment -
5.Test Points and Adjustment points
6.Servo Circuit Adjustments
6-1.Switching point adjustment ---
6-2.X-value adjustment
6-3.Vertical jitter adjustment
6-4.Forward slow tracking preset adjustment.
6-5.Reverse slow tracking preset adjustment.
7.Audio Circuit Adjustments --.»
7-1.Hi-Fi audio playback level check
7-2.E-E audio level check --
8.Tape Navigation Circuit Adjustment:-
8-1.Skew adjustment --
9.MPX Audio Circuit Adjustment
9-1.MPX separation adjustment
9-2.MTS input level adjustment
10,Cylinder Rotation Accumulated ,
Hours of Usage Display ---:
11.List of Data in EEPROM and initial Settings ~
12.List of Hidden. Commands -:--
12-1.Mode setting commands during adjustment
12-2.EEPROM initialization commands
13.Coution When Handling IC4302 (NAVI EEPROM) «
14.Caution When Replacing IC903(EEPROM) «+
TROUBLE DISPLAY FUNCTION --
Troubleshooting According to Malfunction Display
+ B10
CHAPTER 4 EXPLODED VIEWS
1.CABINET SECTION --
2.US-MECHANISM (TOP VIEW) SECTION ---
3.US-MECHANISM (BOTTOM VIEW) SECTION
4.US-FL MECHANISM SECTION --
(Carter 5] REPLACEMENT PARTS LIST )
1.MECHANISM PARTS LIST -
2.ELECTRICAL PARTS LIST ----

SCHEMATIC, CIRCUIT BOARD AND BLOCK
CHAPTER 61 DIAGRAMS AND MICROPROCESSOR PIN
FUNCTION TABLES
CONNECTION DIAGRAM
ciRCUIT
SCHEMATIC goaRD
DIAGRAM DIAGRAM
LCD/JACK (LCu) --- see 8-3 / 6-33
FRONT SHUTTLE (FST.
CYLINDER MOTOR:-
CAPSTAN MOTOR
MAIN1 (MAS)
MAIN2 (MAS)
NICAM (N&A) [FOR (GKI)NA, (HKN)}-
A2 (A2) [FOR (AU)} ++
MPX AUDIO (J&U) {FOR (JU)]
TAPE NAVIGATION (NCM)
WAVEFORMS
SERVO WAVEFORMS:
Y/CHROMA WAVEFORNS -
BLOCK DIAGRAMS
MAIN CONTROL.
SERVO-
VIDEO
POWER SUPPLY
AUDIO
MICROPROCESSOR PIN FUNCTION TABLES :

CHAPTER 1 |.
Format:
Recording:
Head:
Tape Speed:
Tape Width:
Operation Temperature:
Video:
Recording Time:
Aerial input:
RF Output:
Video Input:
Video Output:
S/N Ratio (Video):
Audio(Linear):
Hi-Fi Audio:
Horizontal Resolution:
Audio Input:
Audio Output:
Fast Forward/Rewind Time:
Power:
Power Consumption:
Timer:
Cabinet Size:
Weight:
Accessories Included:
GENERAL INFORMATION.
SPECIFICATIONS : joc a - :
VHS PAL & NTSC Standard.
Rotary Two-Head Helical Scan Azimuth Recording
Double azimuth 4 video heads 2 for SP 2 fo LP/EP 2 Hi-Fi audio heads
PAL/MESECAM: 23.39 mm/sec.--SP, 11.7 mm/sec.--LP
NTSC: 33.35mm/sec (SP), 16.67mm/sec (LP) (playback only),
11,12mm/sec (EP)
12.7 mm :
5 TO 40T
PAL & MESECAM colour & CCIR monochrome signals 625 lines
Standard (3.68MHz) and modified (4.43MHz) NTSC colour &
EIA standard 528 lines
480 min. (using E-240 cassetie)(PAL/MESECAM LP mode)
480 min. (using T-160 cassette)(NTSC EP mode)
PAL mode: VHF: 2-12, UHF: 21-69, CATV: X-841
American NTSC mode: VHF: 2-13, UHF: 14-69, CATV: A-6 - W+84
Japan NTSC mode: VHF: 1-12, UHF: 18-62, CATV: C13-C63
PAL mode: UHF channel 38 (22-53 adjustable)...System IG and K
American NTSC mode: UHF channel 36 or 37 (16-56 adjustable)...
4 1 7 System M
Japan NTSC mode: UHF channel 35 or 36 (15-55 adjustable)... System M
0.5 to 1.5 Vp-p 75 ohm Unbalanced
1 Vp-p 75 ohm Unbalanced
43 dB
S/N Ration: 43 dB i
Frequency Range: 70 Hz to 12 kHz
Frequency Range: 20 Hz to 20 kHz
Dynamic Range: More than 90 dB
Wow and Flutter:. Less than 0.005% WRMS
Colour 260 lines
-7.8dBm 50 Kohm
-78dBm 1Kohm
About 2 minutes (with E-180/T-120 cassette)
AC110-240V, 50/60Hz
22 W (including timer)
3.3 W (standby mode)
24-hour digital indication
435 mm (W) X 99 mm (H) X 272 mm (D)
Approx.. 4.0 kg
1--PAL-NTSC aerial cable - (For(JU)]
1--Infrared remote contro] handset
2--Batteries
1--Audio/Video cable
1--Power socket adaptor [For (GKI)NA, (JU)}
1--Aerial plug adaptor {For (JU)]
* Design and specifications are subject to change without notice.

COMEARISON OF SeeuneS
(TEM [__VT-FXB000E/FX8000EM < VT-F99EM
VIDEO HEADS: DAd Heads + HERR" DA4 Heads + Hi-Fi
SP: 48 pm
z LP; 24pm
oe Hi-Fi: 28 pm Hi-Fi: 28 pm
@ [BASIC CHASSIS TYPE US US
© | CAPSTAN DRIVE DIRECT DRIVE DIRECT DRIVE
CYLINDER MOTOR THREE-PHASE OUTER THREE-PHASE OUTER
ROTOR : 360Hz ROTOR ; 360Hz
PAL COLOUR B/G,D/K,I,M (Except for AU) B/G,D/K,1,M
6 B/G (For AU) :
i | VIDEO PAL/MESECAM/PAL60 (PB only) | PAL/(MESECAM/PAL60 (PB only)
2 3.58NTSC/4.43NTSC 3.58NTSC/4.43NTSC
DYNAMIC PICUTRE ENHANCE | YES YES
MESECAM COLOUR YES YES
TUNING SYSTEM FS TUNING F.S TUNING
CATV. YES YES
ce | CHANNEL PRESET No. 49CH Tasch
| RF CONVERTER G,LK.M (Except for AU) G/K/I,M
5 G (For AU)
™ | RF CONV, CHANNEL (22-53) 38 38
[ag __| YES (xcept for JU) YES (For
NICAM YES (For (GKDNAHKN) YES (For SWNA,HKN)
Y!
REC. PROGRAMME 8 PROG/1 YEAR 8 PROG/1 YEAR
cL DIMMER YES (AUTO) | YES (AUTO)
ai (RT LENGTH ONLY. LENGTH ONLY
= | pack UP Time E30 MIN. ABOUT 30 MIN.
G-CORD YES (Except. for JU) YES (For SWNA)
AUTO HEAD CLEANING YES
POWER SAVE YES YES
EDIT IN/OUT JACK NO NO |
TAPE SPEED SP/LP (PAL), SP/LP(PAL),
SP/LP(play o NTSC SP/LP (play only/EP (NTSC:
VIDEO/AUDIO DUB NO NO
@ [xe PLAY NO NO
© | SLOW/REV.SLOW PLAY YES YES
& | RaDV PLAY YES YES
ii [| SATELLITE CONTROL YES _{| YES
= [SHUTTLE RING/JOG DIAL YES YES
w [WSC PLAYBACK YES YES
— {FRONT A/V INPUT JACK YES YES
© | COUNTER GO-TO NO NO
TITLE INDEX NO NO
TROUBLE MODE YES. YES
TAPE NAVIGATION YES NO
CLOSED CAPTION YES NO
AUTO TRACKING YES. YES
y | AUTO OPERATE ON YES YES
| AUTO PLAY YES + YES
5 | AUTO REWIND YES. YES
GE | AUTO REW.SHUT OFF YES YES
zit AUTO TUNING YES (For AU) NO
AUTO SEEK YES (For AU) NO.
AUTO TAPE CANCELLER YES. YES.
~ | PROGRAMME SETTING LCD osD.
i & [CLOCK SETTING LCD OSD.
Q& [veryvvcra/tv YES YES
40 | PROGRAMME MEMORY YES NO
© © [yIpEO PLUS+ YES. NO

COMPARISON OF MAIN CONTROL ICs _
ITEM VT-FXS000E/FX8000EM |. VT-FO9EM .
VIDEO SYSTEM
Y/CHROMA PROCESS JCP8016MSB dco201)__ | HA118203F (1G0202)
CCD DELAY Included in IC201 MSM7470-70MS-KR1 (1C0202)
“PRE/REC AMP.
AUDIO HEAD AMP AN38298' : C1102) _ [LA7256 C1102)
VIDEO HEAD AMP Included in IC201 HA118198F (C1101)
AUDIO
FM AUDIO PROCESS ANS964FB acos01) _ [AN3964FB (C0501)
MAIN CONTROL
MAIN uP (system control nP) HD6433977SC20F acos1) __| 16432977SB03F @co901)
EEPROM S7T24C02-6 acog03) __| sT24Cc02 (IC0903)
TAPE LOADING DRIVE BA6209 acos04) | BA6209 co904)
SERVO CONTROL Included in Main pp Included in Main yp
: = NICAM (For (GKI)NA,HKN) ~~
INICAM DECORDER TDA9874H (C1801) _ | SAA7283GP (101801)
DUAL OPE. AMP NJM4558M icis02) _ [ NJM4558M. (C1802)
A2 (For AU)
ST/DUAL SOUND PROCESSOR J TpA9s40T C1871 ;
FM DEMODULATO TDA9821 c1s72)_“] TDA9821 (C1852) _ |
“» MPX AUDIO (For JU) * 3 Ea
MTS DECODER usa) HTS7342._| C1801) _ | HTS7337A (EC1801)
IMPX DECODER (JAPAN) CXA20208""
ICCD pP (NAVI control)
TAPE NAVIGATION
ac1go2)._[‘CxXA20208 (161802)
USA/JAPAN SELECTOR BA3129FT c1so3)___|BA3129 (161803)
“POWER SUPPLY
SWITCHING DRIVER STR-F6653
M37272M8-122SP 14301) |__
OSD
MB90089-214FP
EP ROM AT24C16 (C4302:
RESET ae RN5VS454A. 104303:
SYNC SEPARATER. MM1108XFFE (1C4304)
VIDEO SW. NJM2249M {IC4103)
IM2535M
104102

TIPS FOR SERVICING
__ TROUBLE DISPLAY FUNCTION ;
This VCR has a function which displays
mechanism malfunctions, étc. in the LCD
display. Use this function to analyze the cause
when the power is shut off due to a malfunction,
ete, in the mechanism. d
Two types of information are displayed, 1) The
operation mode when the malfunction occurred,
2)Malfunction Codes.
The details of the malfunction are displayed-as
follows. :
PROCEDURE TO DISPLAY A MALFUNCTION
Press the ( CH W ) button on the VCR when the
power is turned off and hold it; the malfunction
code is displayed while the button is held
depressed.
LCD DISPLAY
Operation mode
[Display of details of malfunction]
Displayed No. | Item
Operation mode
Malfunction Codes
Details
"00" No malfunction
is FL mechanism lock Malfunction in_insertion/ejection of cassette
202" Capstan lock Malfunction of capstan motor drive during tape unloading
"o4" Reel lock Reel rotation trouble when tape is running
"06" Cylinder lock Cylinder rotation malfanction
"07" Loading mechanism lock | Malfunction in shifting mechanism mode
iat Bae Servo lock Shorting of 5V detected
[Mode Display when Malfunction Has Occurred]
Mode Display Mode Display
Stop No Display Playback PLAY
Fast forward IESE Reverse playback —PLAY
Rewind REW Forward search SRCH
Hight speed fast forward FF Reverse search =SRCH
Hight speed rewind Slow motion play SLOW
Recording ‘Reverse motion slow play —SLOW
Recording pause Still motion play STIEL
No symbols are displayed if the malfunction occurred when a cassette was inserted or ejected,
or the power was switched on from off, and off from on.

C How to Remove the Cassette when a Malfunction Has Occurred in the Mechanism )
Ifa cassette is caught in the mechanism because of a malfunction in the mechanism, remove it
by the following procedure.
(Work Procedure]
1. Remove the top cover.
2. Remove the front panel.
Tf the tape is wound
round the cylinder in
the loading state unloading state.
If the cassette dose not come out
from the FL mechanism in the
Remove the spring and lift the pressure roller to pull it out.
Lift the pressure
rolter and pull it out
Slacken the tape and release it from the tension pole, guide rollers, inclined
guides and P out arm.
{MPEDANCE ROLLER
jemove the screw.
INCLINED GUIDE
GUIDE ROLLER
Gy < OUT ARM
wales]
} 2) Hold the cassette lid with your
not.damaged and remove the FI
3) Remove the slack tape and ej

Instructions on Use and Description of New Functions
The follwing are extracts from the instruction manual.
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CHAPTER 2
identifications of Circuit Boards
N&A {(NICAM) BOARD. .
[FOR (GKI)NA, (HKN)]
A2 (A2) BOARD [FOR (AU)]
J&U (MPX AUDIO)BOARD
1. Before Starting Disassembly
“NCM (TAPE NAVIGATIN) *
BOARD
1) Unplug the power cord from the AC outlet.
2) [Removal procedure]
Ifa special procedure is required when dismantling any
component, it is indicated using numbers. Follow the °
numbers ((1),(2),(3) ...) shown in the illustrations.
[Reinstallation procedure] fins
Reinstall each component in the reverse order to removal
when otherwise not specified. : ;
3) Insert card connectors securely all the way as they are
of the direct insertion type.
LOv (LOD/JACK)
BOARD” -”
FST (FRONT/SHUTTLE)
BOARD.” MAS (MAIN)
7 BOARD
2. Disassembly Method Fig.1-1
When replacing defective parts, first refer to the "Parts hierarchy chart". shown below, This chart shows the
‘procedure for parts removal when replacing defective parts, . a
‘[How to use the parts hierarchy chart]
(1) Locate the part to be replaced.
(2) Check the parts in the ranks above the part to be replaced and start dismantling.
(3) Replace the defective part and reinstall the parts in the reverse order to that shown in the parts hierarchy chart.
_.. Parts Hierarchy Chart.
|....Note: Dismantie parts in the eject-state.
ss
Parts to remove item [ Parts to remove __ Item
Top cover 2-1 ]
Front panel 2-1 | Cassette door 2.2
; Oa Buttons 2-2
“Bottom cover _ 2-1" Front frame 2-3
Be LCJ and FST board 2.3
Rear panel
US-FLméchanism
ea
NCM and N&A, A2 or
J&U boards eis
US mechanism/
MAS board assembly
US mechanism _ 26
2-5

Disassembly
Procedure
Diagrams
ee
Item.
|
Parts
to
remove
2-1
Top
cover,
front
panel
sear
panel, bottom
cover
and
US-FL
mechanism
Caution
when
reinstalling
the
US-FL
mechanism
Reinstall
the
US-FL
mechanism
in
the
state
that
the
cassette
holder
is
Pulled
forward..
(Otherwise,
the
switch
arm
could
damage
the
FL
switch
on
the
MAS
board.)..
(1}.REMOVE:
THREE SCREWS
(5)
REMOVE
TWo
SCREWS
(6)
REMOVE
THREE
SCREWS
4
(3)
REMOVE
FOUR
US-FL
MECHANISM
SCREWS
(4) RELEASE
SIX STOPPERS
(2) RELEASE
EIGHT
SHUTTLE
RING
STOPPERS
JOG DIAL
@
Caution
when
reinstalling
the
front
panel
Reinstall
the
front
panel
in
thé
State
the
cassette
door
is
pushed
so
the
boss
of
the.
door
arm
comes
to
the
front
of
the
boss
support
of
the
cassette
door.
FRONT PANEL
CAUTIN WHEN REINSTALLING
NI
CASSETTE
DOOR
[say FRONT PANEL
RELEASE TWO.
STOPPERS. -
Boss
Boss
‘SUPPORT
CASSETTE
DOR

“| Item : ae Parts to remove
2-3 Front frame, LCJ and FST boards
FRONT FRAME
(1)
LCJ BOARD
(8) DISCONNECT =
FOUR CONNECTORS ~
(4) DISCONNECT:
CONNECTOR
(2) DISCONNECT
THE CONNECTOR
re ; [BOTTOM SIDE]
MAS BOARD :
Fig. 2-3
DISCONNECT
NOM BOARD THREE SCREWS
REMOVE FIVE
SCREWS
DISCONNECT
TWO SCREWS
N&A or A2 or
J&U BOARD,
RELEASE
STOPPER

Item Parts to: remove | C Procedure to remove only the US mechanism
2.6 Separation of MAS board from ___ With this VCR the US:mechanism'can be removed
without removing the MAS board. This is done by a
different method from the normal disassembly method.
US mechanism
[Rear of the mechanism]
= Parts to remove Item
[ : “so Top cover. 2-1
DISCONNECT
Two
CONNECTORS *) REMOVE
TWO SCREWS
Q
DISCONNECT
Two
CONNECTORS
| “os Front Panel 2. | 2-1
a
Yaad [ US-FL mechanism 2-1
REMOVE TWO © ae
- SCREWS ©
a
Remove two screws on the
MAS BOARD zi
bottom of the VCR."
“Remove five screws holding 2-7 :
the US mechanism.
2-7
Q
US MECHANISM
Procedure to remove only the US mechanism ~
REMOVE FIVE SCREWS
US MECHANISM
MAS BOARD

Cautions When Reinstalling the US Mechanism.
This VCR has mechanism sensors on the MAS board
and the capstan and loading motors are connected via
direct connectors. Therefore, when reinstalling the US
mechanism, observe the following cautions.
1) Align the V mark and mode no. 1 of the mechanism
state switch on the MAS board. (Mode no. 1 of the
mechanism state switch has a click position.)
2) Check that mode no. 1 on the P drive gear in the
mechanism and the’V mark of the spring hook are
aligned. If they are not aligned, turn the loading motor
pulley to align them.
3) Pass the end LED through the hole in the mechanism
and install the mechanism from immediately above
using the installation position holes as reference. Check
that the boss of the mechanism state switch and the
hole in the cam gear are aligned.
4) Push the terminal sections (shaded sectionsZ7J] )
of the capstan and loading motors and check that they
are inserted securely.
INSTALLATION =O
POSITION HOLE
BOSS
MECHANISM
STATE SWITCH
HOLE IN
CAME GEAR
INSTALLATION
POSITION HOLE
ALIGH No.1
AND THE ARROW
MECHANISM
STATE SWITCH
Fig. 2-8
INSTALLATION
POSITION HOLE
SPRING HOOK
@.
foeN
CHECK THE
ALIGNMENT
MARKS.
P.DRIVE GEAR
HOLE FOR END LED
LOADING
MOTOR PULLEY
Fig. 2-9
PRESS INSTALLATION
POSITION HOLE

CHAPTER 3
Service Positions
~ ELECTRIC CIRCUIT ADJUSTMENT
AND. TROUBLE DISPLAY
1. Servicing position during electrical
adjustment
Perform adjustment after removing the top cover, front
panel and rear panel. : ~
When the shield cover of the connector between the
cylinder motor and MAS circuit boards is remoted, noise
appears in the played back picture. Attach the shield
cover when checking the picture on the screen...
N&A (NIGAM) BOARD NCM (TAPE
[FOR (GKI)NA,(HKN)} NAVIGATIN)
‘A2 (A2) BOARD [FOR (AU)] BOARD
J&U (MPX AUDIO) BOARD
(FOR (JU)]
BOARD
FST (FRONT/SHUTTLE)
BOARD MAS (MAIN)
Fig. 1 BOARD
2. Servicing positions when repairing and
checking circuits
2-1. Procedure to set the LCJ, FST,NCM and N&A,
A2 or J&U boards to the servicing positions
(Fig. 2)
1) Remove the top cover, front panel and rear panel.
2) Remove the US-FL mechanism.
3) Remove the front frame and open each board as
shown in the diagram below and perform check from
the patterm side (indicated by the arrow).
N&A BOARD
[FOR (GKI)NA,(HKN)]
A2 [FOR (AU)]
J&U
BOARD
[FOR
(JU)]
NCM
BOARD
as |
a
FST BOARD Fig. 2
2-2. Procedure to set the MAS board to the
servicing position (Fig. 3)
1) Remove the top cover, front pane) and rear panel.
2) Remove the US-FL mechanism and front frame,
3) Remove the MAS board, with each board and the US
mechanism assembled on it, from the frame.
4) Turn over the MAS board and perform checks from the
pattern side (indicated by the arrow).
Take care of the following at. this time.
+ Lay the insulation sheet under the boards,
+ Attach the US-FL mechanism when loading a tape.
MAS BOARD
INSULATION SHEET °
FST BOARD
LCJ BOARD NCM BOARD
Fig. 3
3. Be careful of electric shocks
The power supply block’on the right of the VOR has'a
heat sink which generates a high voltage. "HIGH
VOLTAGE" is printed on the heat'sink. Take great
care when handling this heat sink when the power is
turned on during servicing.

1. Test equipmentjigs necessary for
adjustment
1) Dual-trace oscilloscope
2) Colour bar generator
3) Voltmeter
4) Monitor TV (with A/V jacks)
5) Alignment tapes:
MH-2: Part No. 7099052
24HMAF-2: Part No. 7099175
(Hi-Fi alignment tape)
6) Blank tape .
7) CAR oscillator
2. Cautions on adjustment
1) The following conditions apply when otherwise not
specified.
Probe of oscilloscope: 10:1
Synchronization of oscilloscope: Internal syne
Ground of test equipment: PG2508 pin 6
(on MAS board)
2) When performing more than one adjustment, follow
the specified order.
3. Tips for adjustment
3-1.Procedure to reset the main microprocessor
The main microprocessor is not reset even when
the power cord is unplugged from the AC outlet
because its power is backed up by a backup
circuit, Press $708 on the MAS board to reset the
entixe microprocessor. Do not press the reset
switch with the power cord unplugged from the
AC outlet as the slow tracking preset value could
drift. If the preset value drifts, plug the power
cord into an AC outlet and press the reset switch
again with the power turned on. It is
recommended that you press the reset switch
after reinstalling the front panel.
Fig. 5
5 rocedure to Switch off the blue pee :
function
1) Press the “MENU" button of the remote control to
display the menu on the monitor TV screen.
2) Press Cursor button to select the VCR setup screen.
3) Press Cursor bution to specify blue background off.
3-3. Procedure to obtain the LP head playback
mode (X-value adjustment test mode)
Press the CH UP(&) and DOWN(¥) buttons of the
remote control provided simultaneously when an
alignment tape is being played and hold them, then
press the "CHANNEL Y "button on the VCR; The
VCR enters the LP head playback mode (X-value
adjustment test mode).
4. Connections of test equipment
Connect the test equipment as follows when otherwise
not specified. :
1) Connect a colour bar generator to the video input.
jack of the VCR.
2) Connect a monitor TV to the Euro Socket of the VCR.
3) Connect an antenna to the antenna jack and receive
a TV broadcast (only for sound multiplex
adjustment).

5. Test Points and Adjustment Points
1 PBFM 6 GND
2CTLPULSE. 7 VIDEO OUT
3V.PULSE+NAVI 8 SW25Hz
4AUDIO(R) OUT 9 VIDEO IN
5 AUDIO(L) OUT
X-value adjustment screw
Fig. 6 MAS (Main) Circuit Board [Components Side]
RT351
SKEW
Fig. 7 NCM (Tape Navigation) Circuit Board [Components Side]