Hitachi V-209 Service Manual

							The S\\ itches  are set as shown  in the  table  below  to establi�h 
each  power  �upply  mode 
Switche  Po\.1.-er sourc e  Power 
mode 
upply lnode  select 
witch (J) 
select  witch  @ 
----
t  AC 
IXOP 
DC  D OP 
DC  t- 0 
OP 
When  charging  DC 
BATT 
CI-IARGC 
(AD-209) 
*DC  II to  14V  IS supphed  via EXT  DC I PUT  connector.   
After  completing  the charge  of AD-209,  be sure  to set 
power  mode select sw1tch  to DC  OPE. 
When  the output  voltage  of  DC power supply  becomes  less 
than  II V.  the  power  lamp 1 blmking.  When the output 
\'Oitage  1s less  than  approx  I 0.5V.  it stops  the operauon  to 
prevent  the battery  ovenltscharge. 
When  mstrument  is operated  by u�ing  the AD-209,  refer to 
chapter  5, "Battery  Operation." 
n  When  the AD-209  IS not  used,  it is possible  that the 
CIIARGE  lamp is illummated  by setting  the Charge  mode. 
Lxternal  DC operation 
The  V-209  can be operated  by e'temal iX l>Ource  (II to 14 
volts)  In  tillS  case,  DC source  IS supphcd  by the  attached  external DC 
ource  cable. Connect  the whtte  hne of source  cable to plus(+) 
s1de  Reversing  polanty connecuon  may cause  blow of the 
fuse 
D-209  and external  DC source  are automatically  switched 
by  mserting  the external  DC source  cable into EXT  DC 
INPUT  connector. 
7  
						

							Front 
View 
8  
						

							8 
rJ) 
Rear View 9  
						

							CD 
POWER  switch 
After  checking  the line  voltage  select switch,  set POWER 
switch  set to OFF  and then  connect  the AC  cord  to AC 
wall  socket. 
(})  POWER  lamp 
This  lamp  goes on in red  when  the power  supply  is in 
ON  state. 
G)  CHARGE  lamp 
This  lamp  goes on in red  in the  battery  charge mode. 
When  the battery  is completely  charged, this becomes 
dim. 
@)  FOCUS  control 
After  obtaining  an appropriate  brightness by operating 
INTENsity,adjust  FOCUS until the bright  line becames 
clearest.  Although  the focus  is also  corrected  automati­
cally  when  INTEN  is rotated,  the focus  is sometimes 
slightly  shifted. 
@  TRACE  ROTATION  control 
Used  to align  the trace  of CRT  with the horizontal 
graticule. 
@  INTENsity  control 
JO  Works 
as the  brightness  adjustment.  Brightness is increas­
ed  by  rotating  INTENSsity  clockwise.  (j) 
Power 
source  select switch 
Used  to select  the power  sources. 
AC  Operated  with the AC  power  source 
DC  Operated  with the AD-209  or external  DC 
power  source 
®  Power 
mode select switch 
Used  to select  the power  mode. 
See  Selection  of Power  supply  mode. 
  Do  not  set the  Power  mode select  switch  to the  BATT 
CHARGE  except charging  batteries. 
®  EXT 
DC INPUT  connector 
See  External  DC operation. 
(2)  Controls  of vertical  deflection  system 
@  CH 1 INPUT  connector 
B  C  connector  for vertical  axis input 
The  signal  input to this  terminal  becomes  the X-axis  sig­
nal  when  the instrument  is used  as an  X- Y oscilloscope.  
						

							@ 
CH2 INPUT  connector 
Thr  same  as CHI,  but when  the instrument  is used  as an 
X- Y  oscilloscope,  the signal  input to this  terminal 
becomes  the Y -axis  signal. 
@@  Input coupling  switches (AC-GND- DC) 
Used  to select  the coupling  system between  the input 
signal  and vertical  axis amplifier. 
AC  At 
this  setting.  the signal  is connected  through  a 
condenser.  The DC component  of the  input 
signal  is cut  off and  only  the AC component  is dis· 
played. 
GND  At this  setting,  the input  to the  vertical  axis ampli­
fier  is grounded. 
DC  At this  setting,  the input  signal is directly  con­
nected  to the  vertical  axis amplifier  and displayed 
unchanged,  including the DC  component. 
�  @  VOLTS/DIV  select switches 
A  step  attenuator  which selects  vertical  deflection  fac­
tor.  Set it to  an  easily  observable  range corresponding  to 
the  amplitude  of the  input  signal. 
Multiply  the reading  by I 0 when  the I 0:  I probe  is used 
in  combination  with the instrument.  @@ 
VARIABLE  controls 
Fine  tuning  device is used  to vary  the vertical  deflection 
sensitivity  continuously.  Attenuation of less  than  1/2.5 
is  obtained  when this device  is rotated  in the  reverse 
direction  of  the arrow  to the  full. 
This  control  is used  when  comparing  wavefom1s  or when 
measuring  the rise  tinle  of a square  wave in 2-channel 
observation.  Normally this control  is left  rotated  in the 
direction  of the  arrow  to the  full. 
@@  POSITION  controls 
Used  to adjust  the position  of the  vertical  axis. 
The  image  rises with  the clockwise  rotation of this  knob 
and  falls  with  the counterclockwise  rotation. When the 
knob  is at  PULL  position,  (pulled up state)  the gain  of 
the  vertical  axis is magnified  5 times  and the maximum 
sensitivity  becomes I mY  /DIY. 
@  MODE  select switch 
Used  to select  the operation  mode of the  vertical  deflec­
tion  system. 
CH  J Only  the signal  that has been  applied  to CHI 
appears  on the  screen. 
CH2  Only the signal  that has been  applied  to CH2  ap­
pears  on the  screen. 
J  1  
						

							AL 
T Signals  applied  respectively  to CHI  and CH2 
appear  on the  screen  alternatively  at  each sweep. 
This  setting  is used  when  the sweep  time is short  in 
2-channel  observation. 
CHOP  At this  setting,  the input  signals  applied  respec­
tively  to CHI  and CH2  are switched  at  about 
250  kHz independent  of the  sweep  and at the 
same  time appear  on the  screen.  This setting  is 
used  when  the sweep  time  is  long in 2-channel 
observation. 
ADD  The algebraic  sum of the  input  signals  applied 
respectively  to CHI  and CH2  appears  on the 
sc reen  .. 
@  CH2 INV button 
12  Used 
to inverse  the polarity  of the  input  signal  applied 
to  CH2.  Inversion  occurs in a state  where  the knob 
of  the  pushbutton  is depressed  ( _o._  ) and  restored  to 
normal  when the knob  is in  protruded  state ( _0_  ). 
This  switch  is conveniently  used in the  comparison  of 
two  waveforms  having different  polarity or in  the 
observation  of the  waveform  of  the difference  signal 
!CHI  l  -!CH2  I between  CHI and CH2  using  ADD.  (3) 
Controls  of horizontal  deflection system 
@  TIME/DIY  �lect switch 
Sweep  time ranges  are 18 steps  from  0.5 psjdiv  to 0.2s/ 
div. 
X- Y  This  position  is used  when  using the instrument  as 
an  X-Y oscillsocope. 
In  this  position,  the X (horizontal)  signal is con­
nected  to  the input  of CH  1 ; ·  the  Y (vertical) 
signal  is applied  to the  input  of CH2  and has a 
deflection  range from less than  one millivolt  to 
5  volts/div  at a reduced  band-width  of200 kHz. 
@  SWP VARiable  control 
Works  as CAL  and the sweep  time is calibrated  to the 
value  indicated  by TIME/DIY. 
TIM  E/DIV  of sweep  can be varied  continuously  when 
shaft  is out  of CAL  position. 
Then  the control  is rotated  in the  direction  of arrow  to 
the  full,  the CAL  state is produced  and the sweep  time 
is  calibrated  to the  value  indicated  by TIME/DIY. 
Counterclockwise  rotation to the  full delays  the sweep 
by  2.5  times  or more. 
@  FINE  PULL xlO MAG  :::POSITION  control 
Used  to move  the bright  line in horizontal  directions.  
						

							It is indisp ensable  to the  measurement  of the  time  of 
waveform. 
Bright  line is moved  toward  right when  the knob  IS ro­
tated  clockwise  and toward  left with  counterclockwise 
rotation.  The outer  shaft is for  coarse  adjustment  and 
the  inner  shaft for fine  adjustment. 
@  x 
10  MAG  control 
A  and  B sweeps  are magnified  I 0  ume s by  pulling 
out  FINE  knob (inner  shaft)  of POSITION.  In 
this  case,  the sweep  time is I /10  of the  value  indicated 
by  TIME tDJV. Bring  the position  of the  waveform 
to  be  magnified  for observation  from the center  of 
the  scale  by operating  =::POSITION  of the  horizontal 
axis.  Next.switchxiOMAG  switch to PULL  (pulled 
out  state).  Then the waveform  placed at the  center  ts 
magnified  in right  and left directions.  The sweep  time 
in  this  case  is I 0  times  of the  sweep  speed obtained  by 
TIM E/D IV ,  in  other  words.  the reading  is I 10  of the 
sweep  time indicated.  I 
! I 
. 
f-y 
; ft 
f-1-
i-Ii r-1 � 
I 
\ I ! --'-\ I ! 
! 
lf-f--+-
t -
��� 
._  t 
; 
1 
I I I 
Magnified  �--avefom1 
(4)  Synchronization  system 
@  SOURCE  select switch 
U  ed  to select  the triggering  signal source  A sweep. 
Cl ll  The 
input  signal  applied  to CHI  becomes  the trig­
gering  signal 
CH�  The 
input  signal  ttpplied  to CH2  becomes  the trig· 
gering  signal. 
13  
						

							LINE This setting  is used  when  observing  a signal  trig­
gering  with power  supply  line frequency. 
EXT  External  triggering  signal applied  to TRIG  IN­
PUT  becomes  the triggering  signal. 
This  setting  is used  when  triggering  with a special 
independency  of the  vertical  axis signal. 
@  TRIG  INput connector 
Input  terminal  used for external  triggering  signal of 
A  sweep. 
@  TRIG  LEVEL  control 
14  Used 
to decide  at which  portion  of the  waveform 
the  sweep  should  be started  by setting  trigger level. 
This  control  is also  enabled  to switch  SLOPE. 
Depressed  position (nonnal state) is for  SLOPE  and 
PULL  position  (state in which  the knob  is protruding)  is 
for  8 SLOPE. 
Explanation  of synchronization  polarity SLOPE 
Push  at  time  of 
@SLOPE 
Pull  at  time  of 
8  SLOPE  Explanation 
of synchronization  level LEVEL 
0  f' 
,_  At 
the  time 
_  of(±) 
SLOPE 
, -, + 
\  At 
the  time 
o  - ofG 
SLOPE 
- -/ 
@  TRIG 
MODE  select switch 
AUTO  Brought  into automatically  triggering sweep 
in  which  sweep  is always  conducted. 
In  the  presence  of triggered  signal, normal 
triggered  sweep is obtained  and the waveform 
stands  still. In the  case  of no  signal  or out  of 
triggering,  sweep line will appear  automatically. 
This  setting  is convenient  in usual  cases. 
NORM  Triggered  sweep is obtained  and sweep  is con­
ducted  only when  triggering  is effected.  No 
sweep  line will appear  in the  case  of no  signal  or 
out  of synchronization.  Use this MODE  when 
effecting  synchronization  to a very  low fre- 
						

							quency 
signal (30Hz or less). 
TV(V)  This setting  is used  when  observing  the enure 
vertical  picture of television  signal. 
TV(H)  Th1s 
setting  is used  when  observing  the entire 
horizontal  picture of television  signal. 
(NOTE)  Both TV V and  TV H synchronize  only when 
the  synchronizmg  signal is negative. 
(5)  Miscellaneous 
@  EXT  BLANK  connector 
Input  terminal  for brightness  modulation.  It is  of  the  DC 
coupling.  The brightness  is reduced  with  a  positive signal 
and  increases  with a negative  signal. 
@  CAL  O.SV  tip 
Output  terminal  of calibration  square  wave  of about 
I  kHz  and O.SV.  It has  a tip  terminal.  It is used  to cali­
brate  the probe  combination. 
@  GND  terminal 
Earth  terminal  of the  oscilloscope.  5. 
BATTERY  OPERATION 
Operation  of battery  pack AD-209 
I)  Set the  Power  source  select switch  (j) to DC  and  the 
Power  mode select switch @ to DC  OP. 
2)  Tum 
on the  POWER  switch CD. Then  the V-:!09  starts 
to  operate  on the  power  from the AD-:!09. 
The  continuous  operation time is one  hour  and half.  If 
the  battery  is operated  1n excess  of this  period,  the ter­
minal  voltage  will decrease  sharply and the battery  will 
be  in the over-discharged  condition. 
In  this  model,  an alarm  circuit  will be activated  before 
the  over-discharging  and the POWER  lamp G) starts  to 
Oash.  In this  case,  charge  the battery  immediately. 
Note:  When the alarm  c1rcuit  IS energized  and the volt­
age  is lowered  down to IO.SV,  the power  of the 
V-209  is off  automatically  to prevent  the over­
discharge  of the  AD-209. 
The  selection  of the  AD- 209 and  an external  DC 
source  is made  by the  external  DC input  con­
nector ®. 
15  
						

							Charging 
of battery 
I)  ( onne..:t  the \C  cord  10 an  AC  outlet  and  set the ,\(-DC  swnch (J) to  DC  and  the  DC 01'  B \  fT 
CIIARGL  switch@ to BAIT  CHARGE. 
:::!  )  Turn 
on the  pl)>N er  swit..:h CD  and the charging  will stan. 
In  this  case.  the POWER  lamp is not  illuminated. 
3)  T
he  ( 111\RG!  la mp  Q)  is bemg  J!luminated  dunng the 
� h arg e.  II will  take  about  IS hours  until  the batte ry  is 
charged  completely.  When the charging  is completed,  the 
CHARGf  lamp  becomes  dim. 
4)  Wh
en  the  V-109  is opera ted  on  the  AC source.  while it 
is  conn ected  with  the AD- :::!09.  the AD- 209  is in  the 
trickle  charge  mode. 
Operating  con ide rations 
16  Do 
not  short  the both  polarities. 
Do  not  throw  the battery  pack  into  fire. 
a)  Charge  the  battery  m the  ambient  temperature  from 
10 to 3S0C'. 
Do  no t  charge  the battery  for th re e  days  or 4g 
h ou r  in succession.  This  will shorten  the life of 
the  battery. 
b) 
Store  the battery  pack in a cool  and dark  place  and 
in the  ambient  temperature  from -IS to 35°C. 
When  a battery  stored for an e'tended  period is 
u sed . chargr  it for  IS hours. 
1.')  The 
hfe or the  battery  pack IS subject  to the  am­
bient  temperature.  load  cond1t1on and continuous 
operation. 
Usually.  the number  of the  charg e  and  discharge  is 
over  300. 
If  a charge  and  dis ch arg e  is  made  once a day.  the 
life  will  be more  than one year.  If the  life is over, 
the  battery  can not operate  nom1ally.  In this  case. 
replace  the battery. 
d)  Charge 
the spare  battery  once a month  to prevent  a 
self-discharge  of the  battery. 
AD-209  battery pack replacement  procedure 
1)  D
is con nec t  the  power  cord. 
2) 
a) Remove 
four screws  on the  upper  enclosure,  then 
remove  the upper  enclosure  (Refer to the  Fig.  a). 
Remove  the sc rew s and the  plate show n in  the  Fig.b. 
b)  Disconnect  the connecwrs  between the battery 
p ack  an d  t he  osci llosc o pe  and  take  out the batte ry 
pack  AD-209. 
c)  Install 
the new  battery  pack AD-209  to the  com­
partment  as shown. 
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