Philips pm3232 - Service Data

63
Contents
3.
SERVICE
DATA
65
3.1.
Circuit description
05
3.1.1.
Channel
Ya
vertical
amplifier
65
3. 1.1.1. Genera!
65
3. 1.1.
2. Input coupling
65
3. 1.1.
3.
Input
attenuator
65
3.
1.1.
4. Input stage
65
3.
1.1.
5. Pre-amplifier
66
3.
1
.
1
.
6. T
rigger pick-off
stage
66
3.1.
1.7.
Drift-
reduction
circuit
66
3. 1.1.8.
Output amplifier
68
3.1.2.
Channel
Yg
vertical amplifier
68
3.1.3.
Triggering
68
3. 1.3.1.
Trigger pre-amplifier for
internal
triggering
68
3. 1.3.
2.
Trigger
pre-amplifier for
external triggering
68
3. 1.3.
3. Long-tailed pair
circuit
69
3.
1.3.
4. Synchronisation
separator
69
3. 1.3.
5.
Trigger-pulse
shaper
69
3.1.4.
Time-base
generator
69
3. 1.4.1.
Sweep-gating
multivibrator
and sawtooth generator
7
q
3.1.4.2.
Hold-off
circuit
7
q
3. 1.4.
3.
Auto circuit
7
q
3.1.5.
Horizontal
amplifier
7
q
3.1.6.
Cathode-
ray
tube circuitry
71
3.
1.6.1. General
information
71
3.1. 6.2. C.r.t.
circuit
72
3. 1.6.3. Focusing
in the
split-beam
c.r.t.
72
3. 1.6.4.
Blanking circuit
73
3.1.7.
Calibration
voltage
73
3.1.8.
Power supply
73
3.1.
8.1. Mains
transformer
73
3. 1.8.2.
Converter
and
stabilized power
supply
74
3.1. 8.3.
Illumination
circuit
75
3.2.
Checking
and
adjusting
75
3.2.1. General information
75
3.2.2. Power supply
75
3.2.2.1. Mains
current
7
g
3.2.2.2.
Supply
voltages (R823)
70
3.2.3. Cathode-ray
tube circuit
77
3.2.3.1. Adjustment
to display
time-base
lines
77
3.2.3.2. Trace
rotation
(R813)
77
3.2.3.3.
Beam correction
77
3.2.3.4.
Focus
and astigmatism (R809)
77
3.2.3.
B.
Barrel and
pin-cushion
distortion
75
3.2.3.6. Brightness (R711,
R801, R802)
75
3.2.3.7.
Focus correction
75
3.2.4.
Vertical
amplifiers
75
3.2.4.
1
. General
information
75
3.2.4.2.
D.C.
Balance
(R6
,
R7)
7
^
3. 2. 4.3.
Gate current
(R126, R326)
7
^
3.Z4.4. Pre-amplifier
(R64, R99, R264, R299)
7
^
3.2.4.5.
Sensitivity
{R111, R311)
75
3.2.4.6.
Input
attenuator
7
^
3.2.4.7.
Square-wave
response
(C62, C262)
3.2.4.5.
Bandwidth of
the vertical
amplifiers
jl
3.
2.4.9.
H.F. Deflection
and
cross-talk
H
3.2.5.
Triggering
^1
3.2.5.I. Trigger
pre-amplifier
(R414)
3.2.B.2.
Long-tailed
pair circuit
(R424)
3.2.5.3.
Trigger
slope
^2