Page1of 3
Filename: oven-gpg1.tcw
Date: 12/20/97
By:R. Fenske
OVEN-G
SCHEMATIC
7812
REG.
7912
REG.
1000 uF
1000 uF
C8
C10
C9
C11
C12
0.1uF
0.1uF
10 uF
+12V
-12V
OVEN
BOARD
GROUND
BR3
BRIDGE
RECTIFIER
POWERSUPPLYSECTION
LM324OPAMPS INTHIS
CIRCUITOPERATE
USING+12VONPIN4
AND -12VONPIN11.
CAUTION:
ACHOTANDACCOMMONARE
HAZARDOUSVOLTAGESAND
AREPRESENTONTHISANDOTHER
CIRCUITBOARDSWHILE G.C.
POWER ISON.
"JITTER"CIRCUIT:
OPTIMIZES
TEMPERATURE
STABILITY
3
2
1
+
-
LM324
U3
10
9
8
+
-
U3
LM324
C1 0.02uF
R6
100K
100K
1M
R4
R5
+6V
-6V
TO 'OVEN', 'CHASSIS',
AND 'COOL2'
SETPOINTSUMMING
CIRCUITS.
(LABELLED"JITTER")
JITTERCIRCUIT
OVEN
HEATING
AND
COOLING
CIRCUITS
OVEN-GCIRCUITBOARDLAYOUT
CHASSISCOOLINGCIRCUIT
POWERSUPPLY
OVEN-GPCB
READYLIGHT
CIRCUIT
VR1
VR2
OVEN
BOARD
GROUND
CHASSIS
GROUND
35v
35v
50v
Rev.Date: 7/26/04
By: J.Bassett
THEOVENBOARDCONTROLSREADYLIGHT,
OVENHEATING /COOLING,AND INTERNAL
G.C.CHASSISTEMPERATUREREGULATION.
THISPAGEDEPICTS:
POWERSUPPLY,JITTER,VIRTUALOVEN,
ANDCHASSISCOOLINGCIRCUITS.
SEEPAGETWOFOROVENHEATINGANDCOOLING
CIRCUITSANDPAGETHREEFORREADYLIGHTCIRCUIT.
TO24V
CHASSIS
FAN
BRIDGE
RECTIFIER
+
BR2
C7
RED
BLACK
50V
10uF
10
LM324
U4
1N914
D6
U6
R26
100OHM
1WATT
R27
100OHM
1WATT
SCR3
Q6004
ACSWITCHINGCIRCUIT:
SWITCHESACTOCHASSISFAN
FORCHASSISCOOLING
-
+
9
8
COMPARATORCIRCUIT:
COMPARESTHEACTUALTEMPERATURE
(PIN9) TOSETPOINTTEMPERATURE (PIN10)
VIRT
INHIBIT
VIRT
+12V
THELM35 INDICATES
ACTUALCHASSISTEMPERATURE
JITTER INPUT FROMU3 PIN 8
(SHOWNONBOTTOMOF
THISPAGE)
5
6
7
+
-
LM324
U4
Q10
LM35
CHASSISFANCIRCUIT:
VOLTAGEDIVIDER
DETERMINESFANON/OFF
SETPOINTFORCHASSISCOOLING
3.3K
R38
R36
4.02M
+12V
CHASSISCOOLINGFAN
&VIRTUALOVENCIRCUIT
SPADE
U8
SEEPAGETWOFOROVEN
HEATINGANDCOOLINGCIRCUITS.
100K
R37
R48
10K
+
+
+
C
O
1
2
4
6
1
2
4
6
"GATE"
SPADE
LUG
R11
100OHM
1WATT
BLUE(ACHOT)
R10
100OHM
1WATT
SPADE
WHITE
RED
GREEN
POWER INPUTSECTION
MOC3041
OPTOISOLATOR
MOC3041
OPTOISOLATOR
28
VAC
WHITE
RED
GREEN
28
VAC
BLUE (ACHOT)
BLACK (ACCOM)
115VAC
POWER INPUTSECTION
+
1
2
3
NOTE:
VIRTUALOVENOPTION:
CHANGER26TO11K, 1/4WATT,
JUMPBETWEENVIRT.AND
VIRT. INHIBIT, AND
CUTGROUNDTRACETOSPADE
3
1
2
