HP 8340b - Page 227

Table
E-l.
Motherboard Wiring
List
Mnemonic
NDAC
NEG BLANK
NRFD
N1
N2
N2 TUNE
N2 TUNE RTN
N3
N4
N5
N6
PEN LIFT
PEN LIFT RTN
PH1
PH2
PINBIAS
PLSIN
PLS IN RTN
PMOD RTN
PRETUNE
PWR ON LED
Q1B
Q1E
Description
IEEE
488
NOT
DATA ACCEPTED
(NDAC)
NEGATIVE
BLANKING SIGNAL
IEEE
488
NOT
READY FOR DATA
(NRFD)
N NUMBER TO
M/N
OSCILLATOR BIT 1
N
NUMBER
TO
M/N
OSCILLATOR
BIT 2
TUNING
SIGNAL TO PLL2 VCO
GROUND RETURN
N NUMBER TO
M/N
OSCILLATOR
BIT 3
N NUMBER TO
M/N
OSCILLATOR BIT
4
N NUMBER
TO
M/N
OSCILLATOR BIT
5
N
NUMBER
TO
M/N
OSCILLATOR BIT 6
PLOTTER PEN LIFT
PLOTTER PEN LIFT GROUND RETURN
PLL1
PHASE DETECTOR OUTPUT
PLL2 PHASE
DETECTOR
OUTPUT
SYTM
PI
N DIODE BIAS
EXTERNAL PULSE
INPUT
EXTERNAL PULSE GROUND RETURN
PULSE MODULATOR DRIVE GROUND RETURN
YO PRETUNE
+5
Vac
THROUGH
CR1 AND R1
TO DSI
TRANSISTOR 01 BASE
TRANSISTOR 01 EMITTER
Type
DIGITAL
DIGITAL
DIGITAL
DIGITAL
DIGITAL
ANALOG
GROUND
DIGITAL
DIGITAL
DIGITAL
DIGITAL
OPEN
COLLECTOR
GROUND
ANALOG
ANALOG
DIGITAL
DIGITAL
GROUND
GROUND
ANALOG
POWER SUPPLY
ANALOG
ANALOG
Levels
TTL
0,
-5V
TTL
TTL
TTL
OVTO
+7V
0V
TTL
TTL
TTL
TTL
CLAMP AT 56 V
0V
OVTO
+5V
OVTO
+5V
-4V
TO
+12V
TTL
0V
0V
-25V/GHzOs2GHz
+
78V
ANODE-ON
E-16
Motherboard
Wiring
List
Change
5 HP
8340B/41B