GE JS968TK1WW User manual

30" RADIANT SLIDE-IN CONVECTION RANGE
SURFACE UNIT SWITCHES
HOT SURFACE INDICATOR LIGHT
When glass temperature reaches 150°F, the hot surface indicator light is activated
to alert consumer that glass surface is too hot to touch. The hot surface indicator
light is turned on by an additional set of contacts within the temperature limiter.
229C4059P536
RADIANT HEATING ELEMENT SYSTEMS
Heating Elements: The radiant heating element consists of a resistance
ribbon attached to microporous insulation with molded ceramic fiber walls in
a corrosion-protected metal tray.
The Heating Elements come in four sizes:
• 6″– 240 Volt, 1200 Watts
• 12″– 240 Volt, 3000 Watts (Tri Ring 6″, 9″or 12″)
• Bridge – 240 Volt, 2600 Watts
• 6″– 240 Volt, 120 Watts
CONTROL PANEL ASSEMBLY
Replacing Infinite Switches
1. Remove the two screws holding the
infinite switch.
2. Remove steel control panel insert by
removing 4 screws.
3. From the rear of the control panel
assembly, unplug wires and remove
infinite switch.
4. Repeat steps in reverse order to
reassemble the unit.
Removing Faceplate
1. Turn the power off to the unit.
2. Remove all knobs.
3. Unscrew all faceplate retainers while
holding the faceplate against the
control trim. The retainers must only
be hand-tightened.
4. Move the faceplate 3 inches away
from the control panel and unplug the
harness from the panel.
5. Repeat steps in reverse order to
reassemble the unit.
DUAL CIRCUIT CONTROL
The left-front element has two cooking zones:
• To use the bridge, push to turn the control knob clockwise to desired setting.
• To use the 8 ″ cooking area, push to turn the control knob counterclockwise to desired
setting.
When a cooking zone is activated, coils beneath the zone radiate heat through the glass
cooktop to the utensil. The red glow of the coils will be visible through the glass. It will
take the cooking zone on the glass surface a few moments to heat up. The coil cycles on
and off to maintain your selected control setting.
NOTE: Installation information for reference
only. See Installation Instructions shipped
with product for complete details and before
attempting to install. Anti-tip bracket must be
attached to the floor or wall to hold either
right or left rear leg leveler. Make sure leg
leveler reengages the bracket when range is
moved for any reason.
MINIMUM CLEARANCES
Temperature Limit/Hot Light Switch
The Temperature Limit/Hot Light Switch performs two functions:
1. Turns on HOT LIGHT as soon as glass temperature reaches 150°F. The HOT LIGHT
will remain on until the glass surface above the heating unit has cooled below 150°F
(even after surface unit switch has been turned off).
2. Detects when glass temperature above a unit has exceeded its limit of approximately
1031°F and disconnects power to that unit. When glass temperature cools below 1031°F,
the unit will turn back on.
The Temperature Limit/Hot Light Switch cannot be calibrated.
REMOVABLE OVEN DOOR
COMPONENT COMPARTMENT AIRFLOW
The oven uses a fan for cooling the components. Air is pulled in by the fan
blades and circulated in the component compartment. The air is exhausted
through louvers below the control panel and out the slots above the door.
DOOR ASSEMBLIES:
The doors can be separated into two assemblies: (1) Outer assembly which
consists of handle, vent trim, outer glass, bottom trim and frame; (2) Inner
assembly which consists of inner panel, gasket, glass panels and insulation.
The assemblies are held together by 2 screws on each side, along with 4
screws across the bottom.
CAUTION: Care must be taken when mounting door handle not to overtighten
handle screws. Overtightening screws can damage handle. Hand-tighten
screws (do not use electric driver). Make sure handle fits snuggly to door
panel.
SELF-CLEAN DOOR GASKET: The door gasket is attached to the inner door
panel by a chain of spring clips.
1. Locate spring clip at center of gasket and insert in hole on inner door panel near top.
2. Install gasket by bending at 90°beside clip and rocking into hole.
3. Tuck loose ends into slot at the bottom of inner panel.
CONTROL PANEL REMOVAL
The control panel contains the ERC and infinite switches.
To service:
1. Remove faceplate (reference section on control panel assembly).
2. Remove screws (from bottom) securing control panel to vent trim.
3. Remove steel control panel insert by removing 4 screws.
4. Detach from main harness by unplugging the 15-pin and 9-pin connector blocks.
5. Remove 5 screws securing the control panel to the maintop assembly.
6. Control panel can now be removed.
COOKTOP REMOVAL
Before removing the cooktop, the control panel must first be removed (reference section on
control panel removal). The cooktop is fastened to the body side extensions with two (2)
screws. Remove the 2 screws and slide the cooktop assembly forward. Lift the cooktop off.
Heating Element
Micro Porous
Insulation
Ceramic Fiber
Molded Walls
Metal Tray
WARNING
•All ranges can tip
•Injury to persons could result
•Install anti-tip bracket
packed with range
•See Installation Instructions
Adjacent Cabinet
Or Final Location
Of Range Side Panel Wall
Floor-Wood
Bracket
Side
Rear
Leveling
Leg Floor-Concrete
AttachmentToWall
Bracket Wall
Plate
Screw Must
EnterWood
Or Metal
31-1/4"
2-7/8"
ToFront
Surface Of
Countertop
Door Clearance
From Front
Surface of
Countertop
20-5/8"
5-1/2" 19" 5-1/2"
29-15/16"MIN
30-1/16" MAX
23-3/16"
7"
Acceptable
Electrical
Outlet Area
30" Min.
30" Min.
from
cooking
surface to bottom
of overhead
cabinets
Shave Raised Edge
To Clear 31-1/8"
Wide Control Panel
6" Min.
FromWalls
9/16"
A
13"
Max.
depth
24"Min.
For Optimum
InstallationThese
Surfaces Must
Be Flat & Level
Max. depth of
cord, plug and
recpt. box
4" to prevent
interference
with drawer
Follow instructions
packaged with alternate
appliance.
Countertop
Depth 25"
35-1/2" to 36-1/2"
from floor to
countertop
15" Min. vertical
distance from the
bottom of the adjacent
overhead cabinets
OVEN SENSOR AND DOOR SWITCH OHMMETER TEST
(See “Motorized Door Lock Operation”for door switch function explanation.)
Remove power from oven. Make resistance measurement from side of sensor
and lock switch connector, with exposed terminals disconnected from control.
H1
P
H2
L2
L1
CURRENT SENSITIVE
SURFACE
UNIT
L2
L2
N
PILOT
P
H1
H2
L1 L1
P2
PILOT
S1
S2
4
2
P1
EGO
E.
G.
O.
U
TOP
SINGLE VOLTAGE SENSITIVE
42
P2 P1
L1 L2
PILOT
NSurface Unit
The electronic range control system
consists of the control, key panel,
oven sensor and door lock assembly.
The key panel (control panel) and
electronic control are separate
components but must be tested together.
OVEN SENSOR AND LOCK
SWITCH CONNECTOR
BAKE
RELAY BAKE
L1
"L1"
BLACK
BROIL
RELAY
L1
BROIL
*Approximately 25% on time in Bake.
Bake & Broil relays cannot be on at same time.
There is approx. 1 min. of dead time between
bake and broil unit operation after preheat.
Bake and broil units operate sequentially during first
(preheat)cycle.
** 1 second dead time between bake and broil
units while calling for heat in clean.
"L2"
RED
"L1"
BLACK
L1 BROIL
"L2"
RED
BROIL
RELAY
2700W/16.8
3600 W / 16
BAKE & TIME BAKE*,
BROIL & CLEAN-UNTIL
AFTER 750˚F IS REACHED
3600W/16.4
14.2A
15A
15A
BK
BR
BR
DLB
RELAY
DLB
RELAY
**If convection fan is not working,
make the following checks:
•Check the voltage from terminal CF
to N on control—it should read
120V in Conv Bake or Roast mode.
If not, replace the control.
•If voltage is OK, check the
convection fan motor. It reads
approximately
15–20Ωat room temperature.
Check to make sure the fan shaft is
not rubbing on the oven liner.
L2
L1
N
L1-1
L1-1 CF
M
CONV.
BAKE
**CONV.
FAN
DOOR
SW.
2500W
22
CONVECTION BAKE
NO C
L2
L1
N
L1-1
L1-1 CF
M
BROIL
**CONV.
FAN
DOOR
SW.
4000W
14.4
CONVECTION ROAST
NO C
240V.
240V.
10.4A 10.4A
15A 15A
CONV-1
BROIL-1
**Convection Fan Not Running
DLB
RELAY
DLB
RELAY
P2
S1
S2
4
2
P1
EGO
TOP
DUAL VOLTAGE SENSITIVE
4
2
P1 P2
L2
L1
S2
Indicator
Light
Load 1
4a
S1
Load 2
4a
KEY PANEL
IMPORTANT SAFETY NOTICE: This information is intended for use by
individuals possessing adequate backgrounds of electrical, electronic
and mechanical experience. Any attempt to repair a major appliance may
result in personal injury and property damage. Neither the manufacturer
nor the seller can be responsible for the interpretation of this information
or assume any liability in connection with its use.
DISCONNECT POWER BEFORE SERVICING
IMPORTANT: RECONNECT ALL GROUNDING DEVICES. All parts of this
appliance capable of conducting electrical current are grounded. If
grounding wires, screws, straps, clips, nuts or washers used to complete
a path to ground are removed for service, they must be returned to their
original position and properly fastened.
GROUNDING SPECIFICATIONS
Ground Path Resistance 0.10Ω Max.
Insulation Resistance 250KΩMin.
INSTALLATION REQUIREMENTS
Power Supply: This appliance must be supplied with proper voltage and
frequency, and connected to an individual, properly grounded branch
circuit, protected by a circuit breaker or time-delay fuse, as noted on rating
plate. Wiring must conform to the National Electrical Codes. The rating plate
is located on the lower front frame above the storage drawer.
Overcurrent Protection Ranges
236V
12.4
15.4
21.4
208V
___
12.4
17.4
NEC Maximum Kilowatt Rating
Rating
35 Amp
40 Amp
50 Amp
240V
12.4
16.0
22.0
REMOVABLE OVEN DOOR
The door is very heavy. Be careful when removing
and lifting the door. Do not lift the door by the handle.
To Remove:
1. Fully open the door.
2. Push the hinge locks down toward the door frame,
to the unlocked position. Atool, such as a small
flat-blade screwdriver, may be required.
3. Firmly grasp both sides of the door at the top.
To Replace:
1. Firmly grasp both sides of the door at
the top.
2. With the door at the same angle as the
removal position, seat the indentation of
the hinge arm into the bottom edge of the
hinge slot. The notch in the hinge arm must
be fully seated into the bottom of the slot.
Removal position
Push hinge locks up to lock
3. Fully open the door. If the door will not fully open,
the indentation is not seated correctly in the
bottom edge of the slot.
4. Push the hinge locks up against the front frame of
the oven cavity, to the locked position.
5. Close the oven door.
4. Close door to the door removal position, which is halfway
between the broil stop position and fully closed.
5. Lift door up until the hinge arm is clear of the slot.
Bottom Edge
of Slot Hinge Arm
Indentation
Hinge Arm
Hinge
Lock
Key Panel Test
Press each pad on the key panel followed by the Clear/Off pad. If the key panel is
functioning properly, the following should occur:
•Bake, Broil, Convection Bake, Convection Roast, Clean, Timer, Clock, Stop Time and
Cook Time Modes –Audible tone plus display showing mode of operation selected.
•Clear/Off –Audible tone and display shows time of day.
•Probe –Audible tone and response if meat probe is plugged in.
•Numerical Pads –Audible tone. Can only be used after another function has been
selected.
Glass Touch Models ONLY –Lock Reference Command
When the control panel is accessed, the signals used by glass touch control may
be adversely affected. To compensate for this change in signals, the following
procedure must be followed every time the control panel is accessed.
1. Make sure power to the range is turned off.
2. Completely close the range control panel and return the range to its normal
installation.
3. Apply power to the range.
Steps to Follow if the Control is NOT Replaced
Step
4
5
6
7
Key presses (Digi-pad)
Bake & Broil
9 & 0
1 & 5
6 & 8
Key presses (Slew-pad)
Bake & Broil
Hour Down & Minute Down
Temp Up & Minute Up
Hour Down & Minute Up
Action
Enter SF
Reset control
Reset LOCK REF
Acknowledge
LOCK REF
Steps to Follow if the Control IS Replaced
Step
5Key presses (Digi-pad)
6 & 8 Key presses (Slew-pad)
Hour Down & Minute Up Action
Acknowledge
LOCK REF
Accessing the control panel area and replacing the control:
4. After power is applied to the range, the control will briefly display all segments,
briefly display “LOC REF,”display all segments for 30 seconds, and then display
“LOC REF.”
5. Acknowledge the “LOC REF”command by pressing the 6and 8or the HOUR
DOWN and MINUTE UP keys at the same time. The control should then display
the time of day.
6. The oven should be ready for normal operation.
7. If steps 4–6 do not occur as described, repeat the process or follow steps
1–9 in the section above.
8. Test the functionality of the glass touch control, especially the CLEAR/OFF
and/or CANCEL key(s).
KEY PANEL (cont.)
Slot
Hinge Lock
Pull hinge locks down to unlock
Accessing the control panel area but not replacing the control:
4. Enter Special Functions mode by pressing the Bake and Broil keys at the same
time.
5. Reset the control by pressing the 9 and 0 or the Hour Down and Minute Down
keys for 3 seconds at the same time.
6. Approximately 20 seconds after the time of day is displayed, press the 1and 5 or the
TEMP UP and MINUTE UP keys. The control should briefly go blank, briefly display
all segments, briefly display “LOC REF,”display all segments for 30 seconds, and
then display “LOC REF.”
7. Acknowledge the “LOC REF”command by pressing the 6 and 8 or the HOUR
DOWN and MINUTE UP keys at the same time. The control should then display the
time of day.
8. The oven should be ready for normal operation.
9. Test the functionality of the glass touch control, especially the CLEAR/OFF and/
or CANCEL key(s).
TRI-RING CIRCUIT CONTROL
The right-front element has three cooking zones:
•To use the large 12 ″ cooking area, push to turn the control knob clockwise to desired
setting.
•To use the small 6
″ cooking area, push to turn the control knob counterclockwise to
desired setting.
•To use the 9
″ cooking area, push to turn the control knob either clockwise or
counterclockwise to the zone between the zones for 6 ″ and 12 ″ elements on the
control panel. Release the knob at the desired setting.
1
2
3
4
5
6
7
8
SENSOR
1100 @ RM
2650 @ 865
˚ F
*NOT ON ALL MODELS
UNLOCK
SW. 2
LOCK
SW. 1
MEAT PROBE*
50K @ RM
CONTROL
CONNECTOR
PLUG
THERMAL
SWITCH
OPEN 240
˚ F
CLOSES 190 ˚ F
THERMAL
SWITCH
OPEN 169˚F
CLOSES 140˚F

Pub No. 31-14348 06-05 JR
IMPORTANT
SERVICE INFORMATION
DO NOT DISCARD
JS968
MODEL NUMBERS
229C4059P536
To Replace:
1. Place the drawer rail on the guides.
2. Push the drawer in until it stops.
3. Lift the front of the drawer and push in until the stops clear the guides.
4. Lower the front of the drawer and push in until it closes.
——— If Drawer is Crooked ———
——— If Drawer Won’t Close ———
STORAGE DRAWER REMOVAL
To Remove:
1. Pull the drawer out until it stops.
2. Lift the front of the drawer until the stops
clear the guides.
3. Remove the drawer.
STOP
STOP
GUIDE
RAIL
Drawer does not close completely
Power cord may be
obstructing drawer
in this area
Drawer front panel tipped
away from body side
Rear drawer support
is resting on top of
guide rail
Drawer front panel tipped to one side
Rear drawer support
on top of guide rail
on the high side
NOTE: Control display will flash “LOCK DOOR”
if the door switch is in the “C”to “NC”position
(door open).
•The words “LOCK DOOR”will flash on and
off in the display while the lock motor is in
motion. When the door is locked, the words
“LOCKED DOOR”remain illuminated in the
display.
•CAM –The cam on the motor performs two
functions:
1. Positions the lock hook in the door to
prevent opening during clean operation.
2. Operates the lock switches which tell the
control if the door is unlocked or locked
and ready for Clean operation.
NOTE: When
door is
either being
locked or
unlocked,
both lock
switches will
be in the
open
position.
MOTORIZED DOOR LOCK
The motorized door lock assembly is located above the oven. The assembly
consists of a lock motor cam and switch assembly, lock hook and mounting
plate.
MOTORIZED DOOR LOCK OPERATION
The lock motor is energized when the control is set for Clean and Clean Time
is selected. The K4 Relay contacts will close and complete the circuit that
supplies the voltage to the lock motor.
HTI
HTITech& Ind
HTSYG048B002FL45
-0001
Date:
Madein China
LOCK SW.
N.O. CONTACT
CLOSED
UNLOCK SW.
N.O. CONTACT
OPEN CAM IN
LOCK POSITION
LOCKED
FAN
BLADE
OVEN
LINER
ELEMENT
OVEN
INSULATION
OUTER
BACK
PANEL
CONV.
FAN
(3)
SCREWS
(4)
SUPPORT
OVEN
CAVITY
MOUNTING
SCREWS
(3)
CONV.
FAN
MTG.
SCREWS
FAN
BLADE NUT
L1 N
NO C
NC
LOCK RELAY LOCK
MOTOR DOOR
SWITCH
L1 N
NO C
NC
LOCK RELAY (K4) LOCK
MOTOR DOOR
SWITCH
DOOR LOCKING/OR UNLOCKING
ALL OTHER MODES WITH DOOR CLOSED
COM MDL
COM MDL
TO REMOVE CONVECTION BAKE
ELEMENT:
Remove 3 screws mounting element
to back wall and pull forward and
disconnect wires.
TO SERVICE FAN:
Fan blade can be replaced from
inside oven. Oven must be
removed from installation to
access convection fan motor.
TO ACCESS CONVECTION BAKE ELEMENT:
1. Disconnect power to range; remove oven door and
oven racks.
2. Remove 4 screws mounting panel (2 on each side)
and pull forward.
CONVECTION BAKE ELEMENT AND FAN ASSEMBLY
The convection bake element and fan assembly are located on the back wall
of the oven liner behind the panel with the screen in the center.
FAILURE
CODE MEANING CORRECTION
Determine if problem is with key panel or control by
disconnecting ribbon cable and measuring flat cable pins
13 to 14. Should be open. Should be 100–150 ohms while
pressing OFF key.
-F2-
1. Inside oven cavity as measured by
sensor over 650°F unlatched or
915°F latched
•Welded relay contacts
•Cooling fan stalled or blocked
•Airflow to rear of unit
•High resistance in oven sensor leads/connectors
(especially at sensor in rear)
Shorted OFF key
-F0-
Over temperature
ERC FAILURE CODES
The oven may stop operating but not give an F code on the display immediately.
F codes are stored in nonvolatile eeprom memory until the same fault occurs
twice consecutively. After that, the F code will be displayed. F codes can be
recalled by pressing together TIMER, CLOCK, MIN DOWN or 9. While F codes are
displayed, pressing MIN UP or 8 and HR DOWN or 6 together will clear them.A
fault must exist continuously for 5 minutes before an F code is recorded (F2 and
F8 are sooner).
THERMAL SWITCH
The thermal switch is located on the floor of the component compartment in
front of the fan motor. The thermal switch is wired in series with the lock
motor switches. The limit switch opens at 240°F and closes when
temperatures cool below 190°F. If the thermal switch opens during:
1. Oven Temperature Below 600°F, program is cancelled when thermal
switch opens. Lock motor will run and the words “LOCK”and “DOOR”
will be flashing in the display.
2. Oven Temperature Above 600°F, any mode of operation control will go to
-F2- failure code. When this condition exists, check the fan operation (look
for obstructions), inspect oven installation (make sure grille areas are not
blocked), oven insulation and lock circuit.
SPECIAL FUNCTIONS
The control has a section that can be entered to change how the control will work.
To enter this section:
Press and hold BAKE and BROIL pads for 2 (two) seconds and “SF”appears in
the display. Select the area to change. When the change has been made, press
START to return to Time of Day.
•End-of-Cycle Tone –Press TIMER pad. Display shows “Con Beep”when control
is set for continuous End-of-Cycle Tone or “Beep”when set for noncontinuous.
•°F or °C –Press BROIL pad. Display will show either “F°”or “C°.”Press BROIL
pad again to change.
•12-Hour, 24-Hour, or blank out Time-of-Day Clock –Press CLOCK pad. Display
will show “12 hr,”“24 hr,”“OFF”for blank clock. Press again to change.
•12-Hour Shutdown comes set to shut down after 12 hours of continuous operation;
this can be eliminated—press DELAY START pad. Display will show “No Shdn.”To
turn back on, press DELAY START pad again and display will show “12 Shdn.”
•Sales Mode (special feature for sales floor demonstration) –Press CLOCK and
TIMER pads at the same time. Display will start to cycle through the different modes
of operation.
•Sabbath Mode –This feature disables all but Bake and Timed Bake, overrides
12-Hour Shutdown, disables beeps, and puts symbols in the display during Bake.
Access by pressing DELAY START pad until display shows “SabbAtH.”Exit by
pressing DELAY START until “No Shdn”or “12 Shdn”shows.
BAKE THERMAL SWITCH
The bake thermal switch is wired in series with the lock motor switches.
The limit switch opens at 169°F and closes at 140°F. If the thermal switch
opens during Bake, the program is cancelled and the lock motor will run.
The words “LOCK DOOR”will flash in the display.
TERMINALS
L1-N
COM to N
L1-BA
L1-BR
L1-CONV
*Light-L1
COM to MDL
L1 to CF
VOLTAGE
120 VACALL THE TIME.
120 VACALL THE TIME.
240 VOLTS when oven is not calling for
heat (BAKE, CONV. and BROIL relay
contacts open).
120 VOLTS when light is on.
120 VOLTS not locking or unlocking, door
closed.
120 VOLTS when oven door is closed and
Conv. Bake and Conv. Roast not operating.
CONTROL VOLTAGE
CIRCUIT TERMINALS OHMS
Oven sensor 6 to 8 1100Ω@ Rm
Temp. 2650Ω@ 865°F
Door Unlatched 3 to 5 0Ω
4 to 5 open
Door Latched 4 to 5 0Ω
3 to 5 open
*If oven light is not working,
make the following checks:
•Check oven light bulb.
•Light is to come on when door
is opened—check voltage
across light socket terminals. It
should read 120 VAC. If 0 volts,
check jamb switch and wiring.
•Light is to come on when
control light pad is pressed.
RLY105 should click. Check
voltage from P104-7 to L1. It
should read 120 VAC. If 0 volts,
check oven light keypad using
ohmmeter test. If keypad is
good, replace the control.
HTI
HTITech& Ind
HTSYG048B002FL45
-0001
Date:
Madein China
LOCK SW.
N.O. CONTACT
OPEN
UNLOCK SW.
N.O. CONTACT
CLOSED
CAM IN
UNLOCK POSITION
UNLOCKED
5
4
3
6
8
DOOR UNLATCHED INPUT PIN
DOOR LATCHED INPUT PIN
SENSOR AND LOCK
SWITCH CONNECTORS
LOCK SW. #1
LOCK
SW. #2
LOCK SW. CIRCUIT
UNLOCKED
THERMAL SWITCH
DOOR LATCH OUTPUT PIN 5, -25V DC
THERMAL
SWITCH
5
4
3
6
8
DOOR LATCH OUTPUT PIN 5, -25V DC
DOOR UNLATCHED INPUT PIN
DOOR LATCHED INPUT PIN
SENSOR AND LOCK
SWITCH CONNECTORS
LOCK SW. #2
LOCK
SW. #1
LOCK SW. CIRCUIT
LOCKED
THERMAL SWITCH
THERMAL
SWITCH
-F3- •Disconnect power. Disconnect sensor harness from
control. Measure sensor resistance (white leads) to
be ~ 1080 ohms at room temperature with 2 ohms
per degree change.
•Look for damaged harness terminals if not a bad
sensor.
Open oven sensor (under 950
ohms)
Shorted oven sensor (over
2900 ohms)
-F4- •Disconnect power. Disconnect sensor harness from
control. Measure sensor resistance (white leads) to be
~ 1080 ohms at room temperature with 2 ohms per
degree change.
•Separate sensor from harness to determine fault.
Shorted matrix or START
key
-F7- Determine if problem is with key panel or control by
disconnecting ribbon cable and measuring flat cable using
pinout chart. Allow up to 1000 ohms when pressing a key.
-F8- EEPROM data shift failure If repeated, replace control.
-F9-
Cooling fan stalls while above
650°F; open thermal switch in
yellow or blue leads
Cooling fan or airflow to control area.
-FF- Replace control.
Loss of latch motor safety
circuit