HP 214B - SERVICE BLOCK 1 TROUBLESHOOTING TREE

-
Model 214B
SERVICE BLOCK 1
TROUBLESHOOTING TREE
The purpose of the following troubleshooting tree is to provide a fast means of isolating a fault
down to a function. For detailed theory of operation on a specific function, the serviceman
should proceed
to the associated Service Block e.g. Service Block 3 for Timing.
(
POWER ON
)
...
MEASURE POWER SUPPLY
A4TP5
~ -133 V
A4TPl ~ -155 V
..I 22 V
-5.2 V; +5 V
+15
V; -15 V
VC0602
= 1/2 VCQ601
i.L
~
"
P.S. VOLTAGES
N
OK?
Y
REMOVE WIRE 927
FROM A4
POWER SUPPLY
BOARD
USING EXTENDER BOARD
00214-66590 CONNECT A 1
BOARD
~
"
A2TP5
r-v--L-.
5V
-1.8 V
A2TP5
N
OK?
Y
SHORT A 1 R478
...
.....
"
AHP8
DEPENDING ON AMPLITUDE
VERNIER SETTING
+6 V TO +16 V
<b
N
OK?
Y
214B SETTINGS:
DISCONNECT 214B
FROM LINE
POWER
...
..
AND REMOVE Al
..
OUTPUT AMPLIFIER
......
BOARD
A2TP3
nIL·""
...
..
-...
+1.3V
AHP1
+9.3 V
...
,..J
.-l
..
..
I
+7.5 V
......
+5.6 V
PERIOO
10 )J!i
POSITION
2
"' OEL
WIDTl-I
3 i-/S
AMPLITUDE 3 V - 10 V
OUTPUT
POLARITY
NEG
...
....
,
AHP3
AHP4
I
Q'.'"
REPAIR POWER SUPPL Y
(see Troubleshooting Hints)
+.5V
<b
N
OK ?
Y
,
~~
REMOVE POWER CORD
,
REMOVE SHORT FROM
A1R478
"
MEASURE RESISTANCE ACROSS
A2TP4
A1R420
= 9.5!1
nrl--
5V
A1R432 = 9.5 11
MEASURE SCREEN GRID RES.
...
DEl. ADV. D.P. CIRCUIT
A1R486
= 560!!
-2.2 V
A1R490
= 560!!
<-h
N
OK ?
AHP6
AHP7
Y
-
+--
+16 V DC
...
-.3 V DC
....
,~
CONNECT WIRE 927
TO THE POWER SUPPLY
BOARD AND
APPL Y
LINE
POWER
AHP2 AHP5
~
nJL·m
nrL+19 V
...
..
r---
OVERLOAD LED SHOULD
+12 V
SWITCH OFF AFTER 1 MIN.
+.2 V
CHECK ATTENUATOR
...
...
Scans by Artekmedia => 2009