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Tandy CM-4 User Manual

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NO
SYNCHRONIZATION CAN
BE
PROVIDED
Circuits
checked:
IC601
and
its
related
circuits.
I
IC601,Q423
Both
horizontal
synchronization
obtained.
and vertical
cannot
be
HORIZONTAL
SYNCHRONIZATION
CANNOT BE OBTAINED.
Does
pin
@
of
IC601
have
a saw-
tooth
wave and
sync signal?
X
Yes
1C601
1
R605
I
R606
l
R607
'
I
I
(But
vertical synchroni-
zation
is
normal.)
With
the H-hold
control
adjusted,
does
the horizontal
sync frequency
vary?
No
i
1C6011
1 Q423
'
Yes
1
C606
I
C604
'
I I
No
r
zrr
n
1C601
1
R620
1
I
D602
I
'
R607
'
Q423
I
I
1
VERTICAL
SYNCHRONIZATION
CANNOT BE
OBTAINED
Vertical
sync,
possible
at
all.
r
.._.j
!
IC601
R502
C501
I
1
IC601
R514
C504|
1 1
adjustment
is not
a
(But horizontal
synchronization
is
normal.)
The
vertical sync frequency
car
varied
slightly.
1
_±_.
1
1C601
R513
1
R510
R514
1 R511 C503
1
R512 C505
L
be
VERTICAL
SWEEP
DOES
NOT
OCCUR
Circuits
Checked
:
IC601
and its related
circuits
Q501
and
Q502,
and
their related
circuits
Apply
a
ripple current signal,
across
a
resistor
(1
Kohm)
and capacitor
(10>F)
in
serial
connection,
to pin
(2)
of
IC601.
Sweep
occurs
vertically
on
the
raster.
I
IC601
|R504
1
R505
R506
LR507
T
R508
R509
R510
C503
C506
No
sweep occurs.
ct:_
R511
I
Caution:
R51
2
| When
inspecting,
reduce
the brightness
R513
|
level
to protect
the
CRT
from damage.
R514
1
R51_5j
Note:
Ripple
current
signal
is represented
at
the
junction of
C706
and R703.
L
IC601
R505
R506 R519
Q501
D502
R507 R520
Q502
D503
R508
C509
DY601
R503 R516
C510
D504 R504
R518
C512
R524
20

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Tandy CM-4 Specifications

General IconGeneral
BrandTandy
ModelCM-4
CategoryMonitor
LanguageEnglish

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