HP 8340A Service Manual page 313

MNEMONIC
DESCRIPTION TYP£ LEVELS
MOD RTN
ALC MODULATORS GROUND RETURN GROUND OV
XA26P1-21
MODHI HIGH BAND MODULATOR DRIVE
CURRENT SOURCE XA26P1·20
MOD LO
LOW BAND MODULATOR DRIVE ANALOG CURRENT SOURCE
XA26P1-22
MODLVL
MODULATOR LEVEL ANALOG 0 TO -3 LEVELED XA26P1·32
MUTE PLOTTER MUTE CONTROL
DIGITAL TTL (HIGH TRUE) XA57P1·61
M1 M NUMBER TO M/N OSCILLATOR BIT 1 DIGITAL
TTL (HIGH TRUE) XA59P1·33
M2
M NUMBER TO M/N OSCILLATOR BIT 2 DIGITAL TTL (HIGH TRUE)
XA59P1-88
M3
M NUMBER TO M/N OSCILLATOR BIT 3 DIG�TAL TTL (HIGH TRUE) XA59P1-32
M4 M NUMBER TO M/N OSCILLATOR BIT 4 DIGITAL
TTL (HIGH TRUE) XA59P1·87
M5
M NUMBER TO M/N OSCILLATOR BIT 5 DIGITAL
XA59P1-31
NDAC
IEEE 488 NOT DATA ACCEPTED (NDAC) DIGITAL TIL
XA60P1-4
NEG BLANK NEGATIVE BLANKING SIGNAL DIGITAL
0. ·-·5V XA57P1-41
NRFD
IEEE 488 NOT READY FOR DATA (NRFD) DIGITAL TIL
XA60P1-5
N1
N NUMBER TO M/N OSCILLATOR BIT 1 DIGITAL TIL XA59P1-48
N2
N NUMBER TO M/N OSCILLATOR BIT 2 DIGITAL TIL XA59P1-103
N2 TUNE TUNING SIGNAL TO PLL2 VCO ANALOG
OV TO 17V XA41P1-2 3
N2 TUNE TAN
GROUND RETURN GROUND ov
XA41 Pl-8
N3 N NUMBER TO M/N OSCILLATOR BIT 3
DIGITAL TIL XA59P1-47
N4 N NUMBER TO M/N OSCILLATOR BIT 4
DIGITAL TIL XA59P1-102
N5
N NUMBER TO M/N OSCILLATOR BIT 5 DIGITAL TIL
XA59P1-46
N6 N NUMBER TO M/N OSCILLATOR BIT 6
DIGITAL TIL XA59P1·101
PEN LIFT PLOTTER PEN LIFT
OPEN COLLECT CLAMP AT 56V XA57P1-108
PEN LIFT RTN PLOTTER PEN LIFT GROUND RETURN GROUND
ov XA57P1·109
PH1
PLL 1 PHASE DETECTOR OUTPUT ANALOG
A62R12
P , H 2 PLL 1 PHASE DETECTOR OUTPUT
ANALOG ov TO +sv A62R13
PIN BIAS
SYTM P.l.N. DIODE BIAS DIGITAL 4V TO +12V
XA24P1·24
PLS IN EXTERNAL PULSE INPUT
DIGITAL TIL A62J26 CENTER
PLS IN RTN EXTERNAL PULSE GROUND RETURN GROUND
ov NOTE 10
PMOD RTN
ov
XA21 P1-35
PRETUNE
YO PRETUNE ANALOG 2.5V/GC 0 2GC
XA54P1 ·24
�
PWR ON LEO
+s VAC 2 THROUGH CR1 ANO R 1 TO OSI POWER SUPPLY
+.78V ANODE ON A62R1
018 TRANSISTOR 01 BASE
ANALOG XA53-4
01E TRANSISTOR 01 EMITTER ANALOG
XA53-7. 8, 26, 26
02B TRANSISTOR 02 BASE
ANALOG XA53P1·21
02E TRANSISTOR 02 EMITTER
ANALOG XA53P1-1. 19
Q3B
TRANSISTOR Q3 BASE ANALOG
XA52-7
03C TRANSISTOR Q3 COLLECTOR
ANALOG
XA52·6, 30
03E TRANSISTOR Q3 EMMITER
ANALOG XA52·6, 32
048
TRANSISTOR 04 BASE ANALOG
XA52·3, 27
04C
TRANSISTOR 04 COLLECTOR ANALOG
XA52-1. 2, 25, 28
04E TRANSISTOR 04 EMITIER
ANALOG XA52-4, 5, 28. 29
REN
IEEE 488 REMOTE ENABLE (REN) DIGITAL
TTL (LOW TRUE) A62J7-10
RFSWP
SWEEP RAMP TO R.F. OUTPUT SECTION ANALOG 10V/SWEEP
XA57P1-42
REF
M/N 21!l/30 LOOP
LOOP
SOURCE
- - - - - - -
Cl. Cl. Cl. Cl. ii'. ii'.
Cl. Cl. Cl.
.. .. "' "' - "'
Ul !'- IS) (\J
� � �
� � � � � �
x
5
6
3
4
1
15
14
2 3
28
8 10
13
12
11
10
24 THAU R12
TO PIN 11
25 THRU R13
TO PIN 12
SVlEEP GENERATOR
Y/O LOOP CONTROLLER RF SECTION
- - - -
- - - - - "' - "' - - -
ii'.
Cl. Cl. Cl. Cl. Cl. & Cl. Cl. N� Cl. Cl. Cl. Cl. Cl.
.. "' "' "' - - ..,.
"' w IO Ul
"' !'- !'-
� � � � � � �� �� � � � �
Yi
21
20
22
32 01
61
33
88
32
87
31
4
4
41
5 5
48
103
47
102
46
101
108
109
24
18
17
35
24 8, 23
2 2
42 . 17
Scans by HB9HCA and HB9FSX
POWER SUPPLIES
MISCELLANEOUS Tl
A62 MOTHERBOARD
- - - A62 MOTHERBOARD WIRE COAX CONNECTORS
n: ii'. ii'.
Cl. Cl. Cl.
CONNECTORS COLORS J4-J6 J8-J17,J21-J28
"' IO (\J "' Ul
ID -
� � � �
A62J13 - SMC SHIELD
A62J14 - SMC SHIELD AND
GUARD TRACE AROUND MODH\
AND MODLO
A62J13 - SMC CENTER
A62J14 · SMC CENTER
A62J31 PINS 8, 22
'
A62J7 PIN 15
A62J31 PINS 1, 15
A62J7 PIN 13
A62J31 PINS 6, 20
A62J31 PIN 21
A62J18 PIN 10
A62J26:
·
A62J26' · SMC SHIELD AND
GUARD TRACE AROUND PLS IN
A62J 10/25 - SMC SHIELD AND
GUARD TRACE AROUND HIPMOD
AND LOPMOD ORV
22 A62J5 SMC CENTER
NOTE ·
B
4
7. 8
25, 26
21
1, 19
7
6, 30
8. 32
3, 27
1.2
25, 26
4. 5
28 29
A62J7 PIN 10
'
Refer to Table 8E·1. Motherboard Wiring List (7 of 7) for NOTES
Table 8£-1. Morherboard Wiring List (4 of 7)
A62 MOTHERBOARD GROUNDS AND
MNEMONICS
COMPONENTS GROUND PLANES
MOD RTN
MODHI
MOD LO
MODLVL
MUTE
M1
M2
M3
M4
M5
NDAC
NEG BLANK
NRFD
N1
N2
N2 TUNE
N2 TUNE TAN
N3
N4
N5
N6
PEN LIFT
PEN LIFT RTN
PH1
PH2
PIN BIAS
PLS IN
SMC CENTER
PLS IN RTN
PMOD RTN
PRETU NE
A62DS1 ANODE PWR ON LED
018
Q1E
Q2B
Q2E
038
03C
03E
04B
04C
04E
REN
RFSWP
8-407 /8-408