HP 214B - Page 100

(
POWER ON )
'------,--------'
MEASURE POWER SUPPLY
A4TP5" -133 V
A4TP1 "
-155 V .:I 22 V
-5.2 V; +5 V
+15
V; -15 V
VC0602 = 1/2 VCQ601
P.S. VOLTAGES
OK?
y
REMOVE WIRE 927
FROM
A4 POWER SUPPLY
BOARD
USING EXTENDER
BOARD
00214-66590 CONNECT A1
BOARD
....
""
"
A2TP5
N
r---l r----l -.5 V
J W l---1.8V
AlTPB
A2TP5
OK?
y
SHORT A 1 R478
N
DEPENDING ON AMPLITUDE
VERNIER SETTING
+6 V TO +16 V
y
.
.
..
DISCONNECT 214B
FROM LINE
POWER
AND REMOVE A1
OUTPUT
AMPLIFIER
BOARD
A2TP3
n n +3.8 V
I U L+1.3V
A1TP1
I .....l +9.3 V
,......-''----'--- +7.5 V
, +5.6 V
214B SETTINGS:
·
PERIOD
POSITION
WIDTH
AMPLITUDE
OUTPUT
POLARITY
10
"'
2", DEL
3 "'
3 V - 10 V
NEG
I
REPAIR POWER SUPPLY
(see Troubleshooting Hints)
A2TP4
nn
-·
5V
-2.2 V
..
-..
AlTP6
+16 V DC
AlTP2
n h +3.2V~;
I U L+.2V
·
·
...
..
DEL. ADV. D.P. CIRCUIT
AlTP7
-.3 V DC
AlTP5
~ Il +19V I--
I U L+12V
AlTP3
AlTP4
n n +6Vto+16V
I U L+.5V
~~~N ___ ~ ..
Y
REMOVE POWER CORD
REMOVE SHORT FROM
A1R478
MEASURE RESISTANCE ACROSS
A1R420 =
9.5 n
A1R432 = 9.5 n
MEASURE SCREEN GRID RES.
A1R486 = 560 n
A1R490 = 560 n
y
CONNECT WIRE 927
TO THE POWER SUPPLY
BOARD
AND APPLY
LINE
POWER
OVERLOAD LED SHOULD
SWITCH OFF
AFTER 1 MIN.
CHECK
ATTENUATOR
AlTP1
AlTP2
.-l .-l +9.3 V
... -'----,--''---- +7.5 V I---~'"
+5.6 V
h h +3.2 V
I U L+.2V
.
CHANGE RESISTOR
AND CORRESPONDING
TUBE
..
CHECK FET"S
Q408/Q418
CHECK FET DRIVERS
A405; Q406; Q407;
Q415; Q416; Q417
USING
AN OHMMETER. CHECK AND
REPLACE IF NECESSARY:
A1VR410; A1CR411; A1CR412; A1VR404;
A1CR408; A1CR409; A1CR418; A1CR419;
AlVR430
Service
~-
t--
8-5
Scans by ArtekMedia => 2009