Heathkit IO 4541 Flowcharts

Page 1

TEST#1
+9,+5VOLTPOWERSUPPLY

Measure the voltage at points AA. BB. and CC on the
power supply circuit board, This voltage should be = - 9
volts DC,

9

Diode ZD414 incorrectly Installed or shorted. Resistor
R409 incorrect value.

39

Measure the voltage at point R or P on the power supply
circuit board. This voltage should be m 20 volts AC.

3

Low voltage transformer. T2 Is faulty.

VES

YES

VES

VES

Measure the voltage at point W. X. or Y on the power
supply circuit board. This voltage should be = + 9 volts
DC.

Repeat Test #1.

Diode D408, D409. D411, or D410 Incorrectly Installed
or shorted.

Repeat Test #1.

9

Diode ZD415 Incorrectly Installed or shorted.

VES

YES

Repeat Test # 1.

YES

Repeat Test # 1.

Measure the voltage at point A on the power supply
circuit board. This voltage should be + 5 volts DC.

9

Diode 20413 incorrectly installed or shorted. Resistor
F1411 Incorrect value.

VES

Repeat Test # 1.

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Page 2

TEST #2
VERTICAL DEFLECTOR AMPLIFIER

Alternately measure the collector voltage of 0109

Turn the power on and short the base of 0109 to the

The collector voltages of 0109 and 0110 are the
same.

Turn the power o and remove the short 1mm.
between 0109 and 0110, Then short the base of
0107 to the base 010108.Turn the power on.

and 0110. Adjust the VERT P05 control until these N0 base or 0110 Tum the Oscilloscope on,

voltages are equal.
YES

Measure tlie voltage at the source ts) 01 0101 and

3"!5 9 DC L "m' ° 5" ""7 V"" DC 0101 or 0102 incorrectly installed or laulty, Check

0 associated Circuitry (soldering. wrong value parts).

was Repeat Test #2.

Alternalely measure the collector voltages of 0109

3"" 01m. Adm" "5 VERT P05 °" and "9 N0 0103 or 0104 incorrectly installed or faulty. Check

PLATE VOLTS ADJ until these voltages ale equal at
2 30 volts DC.

The vertical deflection amplifier circuits are operating
properly.

associated circuitry (soldering, wrong value parts).

YES

Repeat Test #2. \

D404, D405, D406, D407 installed backward or
faulty.

R32 Incorrect Value.

(325A incorrectly wired or shorted,

YES

Repeat Test #2.

ND

0109 or 0110 incorrectly installed or faulty. Cheek
associated circuitry (soldering, wrong value parts],

The collector voltages of 0109 and 0110 are the
same,

Turn the power a" and remove the short from
between 0107 and 0108, Then short the base of
0105 to the base of 0106. Turn the power on.

N0

0107 or 0108 incorrectly installed or faulty, Check
associated circuitry (soldering, wrung value parts).

Page 12

The collector voltages of 0109 and (1110 are the
same.

Turn the power off and remove the short from
between (1105 and 0106. Turn the power on.

NO

01051 0106, or 0104, installed incorrectly or faulty.
Check associated circuitry (soldering, wrong value
parts).

VES

I Repeat Test #2

0101, 0102, or 0103 incorrectly installed or faulty.
Check associated circuitry (soldering, wrong value
parts).

Page 7

AI!

CA
AC INPUT INPUT 1 OUTPUT OUTPUT AMPLIFIER DRIVER OUTPUT Y1
CAL AUENUATOR FOLLOWER ATTENUATOR FOLLOWER STAGE _ STAGE - STAGE -
PUT : x1,x10, 0101 7 x1,x2,x5 0103 _0105,0106_ 0107,0108 _0109,0110_
8 DC X100 Y2
= i VERTICAL
POSITION <-
BLANKING 3
AMPLIFIFR
->
0308, 0309
+
INT INPUT TRIGGER OUTPUT PULSE SWEEP OUTPUT
' FOLLOWER AMP. STAGE 0 SHAPER GENERATOR FOLLOWER
SWEEP _. _ 0.
0301 0304, 0305 0306, 0307 mm |C303 0311,0312
EXT- 9 I0302
EXT. TRIG. IN TRIG J
9 LEVEL RE-CYCLE
: AND
HOLD~0FF
CIRCUITS .
0310, |C304
SWEEP
INPUT LENGTH OUTPUT AMPLIFIER OUTPUT 3-1-
FOLLOWER FOLLOWER STAGE STAGE
0201 HORIZ, I 0203 0205 0207,0208 --
ExT, GAIN 02 ' X2
IN. = ,
HORIZ.
POSITION

BLOCK DIAGRAM

Page 17