HP 8562E Service Manual

-“-“-“-“-”
; A5 IF ASSEMBLY
-m--m----
RESOLUTION
BANDW I OTH
I
10.7 MHz
IF ADJ OFF
EANDWI DTH
(WHITE) 1
--------------- J
I
CAL OSC
I
+lV DC
L---------,
IF ADJ OFF
w54
DISCONNECTED
J3
+-is-
I
I
LINEAR
j+J- D-
w54
J4 ,‘-,
J
LOG
I
u (RED) )
?
I
WITH COUNTER ON
I
BURSTS OF 5.35 MHz
I
APPROX 10 mSEC
5 VP-P
I
w53
IJ5 (-)
I
/,
!
lyL (BROWN)
w55
J6 A
I
L.& (WHITE/ )
I
BLUE)
I
, A4 LOG AMP/CAL OSC ASSEMBLY 1
.---m---------------
W27
w
(ORANGE)
SK171
Figure 9-2. IF Section Troubleshooting with the TAM
Both the digital control and DACs are multiplexed onto test point “channels” through
resistive networks. One DAC from each of the quad-DAC packages feeds into a network.
The TAM varies each DAC individually to isolate which ones failed. Similarly, 10
digitally-controlled lines feed into a network and are monitored by the TAM. The channels
used to monitor the DACs are listed below:
Channel A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A5J9 pin 1 (MSl)
Channel B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A5J9 pin 3 (MS3)
Channel C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A5J9 pin 4 (MS4)
Channel D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A5J9 pin 2 (MS2)
1. On the HP 85623 spectrum analyzer, press (PRESET), MOIIULE , and Diagnose. Select
Cal fist Troubleshooting Nude.
2. On the HP 85623 spectrum analyzer, disconnect W27 (coax 3) from A5J5 and monitor the
output of A5J5 with a second spectrum analyzer.
IF Section 9-7

HP 8562E Specifications

General

Brand	HP
Model	8562E
Category	Measuring Instruments
Language	English