Hameg HM 203, Manual

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INDENTIFICATION OF ELECTRICAL COMPONENTS HM 2 0 3 -4
Electrical components on certain parts of the HM 203-4
are marked such that the first numeral is on:
Chassis 0..
Y-Inputs, Trig. ext. input, Component tester connector,
Eyelet (Calibrator), Trace rotation coil, LED, Appliance
inlet. Power switch, Power transformer
EY-Board I + II 1..
Attenuator and preamplifier Ch.l + ll
XY-Board 2..
Y-Intermediate amplifier Ch.l + ll, Channel selection flip-
flop, Y-Gate driver stages, Chopper generator, Trig, and
ext. X-Signal amplifier, Trig, gate driver stages,
Component tester, X-Final amplifier, LV-Power, Calibrator
Trigger Board (T-Board) 3..
Trigger circuit, Timebase circuit, Trigger signal final
amplifier, Unblanking circuit, HV-Power, LV-Power 12VT,
Check point strip
Z-Board 5..
Y-Final amplifier
Abbreviations
AI... Appliance inlet
BFt... Bridge rectifier (Silicium)
C. .. Capacitor (fixed)
ChP... Check point
CN...
Connector
CRT... Cathode ray tube
D.
.. Diode (Silicium)
E. .. Eyelet (Calibrator)
F. .. Fuse
1C... Integrated Circuit
L... Inductor, Coil
LED... Light emitting diode
P... Plug
R. .. Resistor (fixed)
S. .. Switch
T. .. Transistor (Silicium)
TR... Transformer
VC... Variable capacitor
VR... Variable resistor
W... Wire
Z... Z Diode
Meaning of Connection Abbreviations
Trigger Board
P2-3/1-
1 6
m u
3..
n
□
Plug
Socket
CRT-Board
CRT
6..
Wire
TS-Board
Trigger selector
7..
1 6
W 2-3/1 -
Resistor Identification XY-Board 2..
Example: P2-3/1-5 or W 2-3/1-5 respectively.
P = Flat cable plug (soldered on board).
W = Flat cable wiring (directly soldered on board) with socket (movable).
2-3 = Connection between Board 2 (XY-Board) and Board 3 (Trigger-Board)
1 = First flat cable connection between Board 2 and 3.
5 = Serial number of the wire (in the flat cable).
( T ) = Serial number of the wire (in the diagram).
O
Trigger Board 3..
P2-3/1 -
O — Q — O • O '
W 2-3/1 -
XY-Board
2..
Color-Abbreviations for insulated wire
bk = black
ye = yellow
gr = grey
bn = brown
gn = green
wh = white
rd = red bl = blue
trp = transparent
or = orange vi = violet gn/ye = green/yellow stripe
Resistor 0.25W 2% (carbon film)
Resistor 0.25W 1 % tc = 50-10 6/K (metal film)
Resistor 0.25W 0.5% tc = 50- 1 0 6/K (metal film)
Resistor 0.5W 2% (or for HV) (carbon film)
Resistor 4W 2% tc = 400- 1 0 6/K (metal oxide film)
Check strip
on Trigger Board
10
—
•
CRT Cathode
22V T U + ( - 1900V).*-
9
• — 1 .9 k V ^
8
O
(NC)
7
• + 3.75V
6
• + 140 V
5
•
+ 260V
4
•
+ 3.1V ( - 1 2 V antipole)
3
•
+ 24V
2
• + 5V
1 • - 1 2 V
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