Contents - Philips pm3232 Instruction Manual

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 (R 6
,
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