Panasonic NN-T794SF User manual

© 2004 Shanghai Matsushita Microwave Oven Co.,
Ltd. All rights reserved. Unauthorized copying and
distribution is a violation of law.
NN-P794 NN-T794SF
NN-T784SF NN-T774SF
NN-T764SF NN-T754SF
NN-H764 NN-S754
NN-H744 NN-S744
NN-H724
APH(USA)
CPH(CANADA)
Microwave Oven
Please file and use this specified manual together with the service manual for Model NN-
S560BF/WF(ORDER NO. SIMMC0001002C3).
ORDER NO.SIMMC 0401003A1
E1

2
NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724

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NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724

1 SCHEMATIC DIAGRAM 5
1.1. APH 5
1.2. CPH 6
2 MEASUREMENTS AND ADJUSTMENTS 7
2.1. Adjustment of primary latch switch, secondary latch switch
and short switch. 7
2.2. Measurement of microwave output 7
3 PROCEDURE FOR MEASURING MICROWAVE ENERGY
LEAKAGE 8
3.1. Equipment 8
3.2. Procedure for measuring radiation leakage 8
3.3. Record keeping and notification after measurement 8
3.4. At least once a year, have the radiation monitor checked
for calibration by its manufacturer. 8
4 EXPLODED VIEW AND PARTS LIST 9
4.1. EXPLODED VIEW 9
4.2. PARTS LIST 10
4.3. ESCUTCHEON BASE ASSEMBLY 12
4.4. WIRING MATERIALS 14
4.5. PACKING AND ACCESSORIES 15
4.6. DOOR ASSEMBLY 16
5 DIGITAL PROGRAMMER CIRCUIT 17
5.1. NN-P794 APH/CPH 17
5.2. NN-T794SF APH, NN-T784SF APH, NN-T774SF APH
19
5.3. NN-T764SF APH, NN-T754SF APH 21
5.4. NN-H764 APH/CPH, S754BF/WF APH 23
5.5. NN-H744BF/WF APH, H724BF/WF APH, S744BF/WF
APH 25
5.6. PARTS LIST 27
CONTENTS
Page Page
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NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724

1 SCHEMATIC DIAGRAM
1.1. APH
5
NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724

1.2. CPH
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NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724

2.1. Adjustment of primary latch
switch, secondary latch switch
and short switch.
1. Mount the Primary latch switch, the Secondary latch switch
and the short switch to the door hook assembly as shown in
ILL.
NOTE:
No specific individual adjustments during
installation of the Primary latch switch, Secondary
latch switch or Short switch to the door hook are
required.
2. When mounting the door hook assembly to the oven
assembly, adjust the door hook assembly by moving it in
the direction of the arrows in the illustration so that the oven
door will not have any play in it. Check for play in the door
by pulling the door assembly. Make sure that the latch keys
move smoothly after adjustment is completed. Completely
tighten the screws holding the door hook assembly to the
oven assembly.
3. Reconnect the short switch and check the continuity of the
monitor circuit and all latch switches again by following the
component test procedures.
2.2. Measurement of microwave
output
The output power of the magnetron can be determined by
performing IEC standard test procedures. However,due to the
complexity of IEC test procedures, it is recommended to test
the magnetron using the simple method outlined below.
Necessary Equipment:
*1 liter beaker *Glass thermometer
*Wrist watch or stopwatch
NOTE:
Check the line voltage under load.Low voltage will
lower the magnetron output. Take the temperature
readings and heating time as accurately as possible.
1. Fill the beaker with exactly one liter of tap water.Stir the
water using the thermometer and record the water’s
temperature. (recorded as T1).
2. Place the beaker on the center of glass tray.
Set the oven for High power and heat it for exactly one
minute.
3. Stir the water again and read the temperature of the water.
(recorded as T2).
4. The normal temperature rise at High power level for each
model is as shown in table.
TABLE (1L-1min.test)
RATED OUTPUT TEMPERATURE RISE
1200W(IEC705-88) Min. 18.5°F(10.3°C)
1300W(IEC705-88) Min. 19.8°F(11.1°C)
2 MEASUREMENTS AND ADJUSTMENTS
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NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724

NOTE:
The U.S. Government standard is 5 mW/cm2while in the
customer’s home. 2mW/cm2stated here is our own
voluntary standard. (1mW/cm2for Canada)
3.1. Equipment
• • •
• Electromagnatic radiation monitor
• • •
• Glass thermometer 212°F or 100°C
• • •
• 600cc glass beaker
3.2. Procedure for measuring
radiation leakage
Note before measuring.
• • •
• Do not exceed meter full scale deflection. Leakage monitor
should initially be set to the highest scale.
• • •
• To prevent false readings the test probe should be held by
the grip portion of the handle only and moved along the
shaded area in Figure no faster than 1 inch/sec
(2.5cm/sec).
• • •
• Leakage with the outer panel removed ...... less than
5mW/cm2.
• • •
• Leakage for a fully assembled oven with door normally
closed ...... less than 2mW/cm 2(1mW/cm 2for Canada).
• • •
• Leakage for a fully assembled oven [Before the latch switch
(primary) is interrupted] while pulling the door ...... less than
2mW/cm 2.
1. Pour 275 ± 15cc (9ozss± 1/2oz) of 20°C ± 5°C (68° ± 9°F)
water in a beaker which is graduated to 600cc, and place in
the center of the oven.
2. Set the radiation monitor to 2450MHz and use it following
the manufacturer´s recommended test procedure to assure
correct results.
3. When measuring the leakage, always use the 2 inch (5cm)
spacer supplied with the probe.
4. Tap the start pad or set the timer and with the magnetron
oscillating, measure the leakage by holding the probe
perpendicular to the surface being measured.
3.2.1. Measurement with the outer panel
removed.
Whenever you replace the magnetron, measure for radiation
leakage before the outer panel is installed and after all
necessary components are replaced or adjusted. Special care
should be taken in measuring around the magnetron.
3.2.2. Measurements with a fully
assembled oven.
After all components, including outer panel are fully assembled,
measure for radiation leakage around the door periphery, the
door viewing window, the exhaust opening and air inlet
openings.
3.3. Record keeping and
notification after measurement
• • •
• After any adjustment or repair to a microwave oven, a
leakage reading must be taken. Record this leakage
reading on the repair ticket even if it is zero.
A copy of this repair ticket and the microwave leakage
reading should be kept by repair facility.
• • •
• Should the radiation leakage be more than 2 mW/cm2
(1mW/cm for Canada) after determining that all parts are in
good condition, functioning properly, and genuine
replacement parts as listed in this manual have been used,
immediately notify PASC, PSC or PCI.
3.4. At least once a year, have the
radiation monitor checked for
calibration by its
manufacturer.
3 PROCEDURE FOR MEASURING MICROWAVE ENERGY
LEAKAGE
8
NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724

4 EXPLODED VIEW AND PARTS LIST
4.1. EXPLODED VIEW
9
NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724

4.2. PARTS LIST
NOTE:
1. When ordering replacement part(s), please use part number(s) shown in this part list.
Do not use description of the part.
2. Important safety notice:
Components identified by mark have special characteristics important for safety.
When replacing any of these components, use only manufacture’s specified parts.
NOTE:
“A” parts are supplied by MOD (Japan)
“F” parts are supplied by SIMMC (China)
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
1F00064W70AP CAUTION LABEL 1P794 APH, T7*4SF APH
1F00069660AP CAUTION LABEL 1 H7*4 APH, S7*4 APH
1F00067600CP CAUTION LABEL 1 CPH
2F00076J00BAP NAME PLATE 1H764BF APH
2F00076J00HAP NAME PLATE 1H764WF APH
2F00076J50BAP NAME PLATE 1H744BF APH
2F00076J50HAP NAME PLATE 1H744WF APH
2F00076J70BAP NAME PLATE 1H724BF APH
2F00076J70HAP NAME PLATE 1H724WF APH
2F00076J30BAP NAME PLATE 1S754BF APH
2F00076J30HAP NAME PLATE 1S754WF APH
2F00076J60BAP NAME PLATE 1S744BF APH
2F00076J60HAP NAME PLATE 1S744WF APH
3F00334W00AP FUSE LABEL 1
4F10016H60AP BASE 1
5F10084T00AP RUBBER FOOT 4
6F110D6H60BAP CABINET BODY (U) 1P794BF APH/CPH
6F110D6H60HAP CABINET BODY (U) 1P794WF APH/CPH
6F110D5X00SAP CABINET BODY (U) 1P794SF APH/CPH, T794SF APH, T784SF APH,
T764SF APH, T754SF APH
6F110D4W70NAP CABINET BODY (U) 1T774SF APH
6F110D5K00BAP CABINET BODY (U) 1H7*4BF APH/CPH, S7*4BF APH
6F110D5X20HCP CABINET BODY (U) 1H7*4WF APH/CPH, S7*4WF APH
7F200A5X20AP OVEN£ (U) 1P794 APH/CPH, T794SF APH, T784SF APH, T774SF APH,
T764SF APH, H7*4 APH/CPH
7F200A5X30AP OVEN (U) 1 T754SF APH, S7*4 APH
8F20555K00AP COVER 1
9F21315Y00AP PULLY SHAFT 1
10 F2177-F80 WASHER 1
11 F290D9330AP ROLLER RING (U) 1
12 F3020-1200 DOOR HOOK 1
14 F3136-1200 HOOK LEVER A 1
15 F31374650AP HOOK LEVER B 1
16 F31384650AP HOOK LEVER C 1
17 F400A5Y00AP FAN MOTOR 1AC120V, SINGLE PHASE, 60Hz
18 F40084T00AP FAN BLADE 1
19 F40254W00AP AIR GUIDE A 1
21 F41445W00AP ORIFICE 1
22 F64508660AP SENSOR COVER B 1P794 APH/CPH, T794SF APH, T784SF APH, T774SF APH,
T764SF APH, H7*4 APH/CPH
24 F65434W00AP SENSOR COVER C 1P794 APH/CPH, T794SF APH, T784SF APH, T774SF APH,
T764SF APH, H7*4 APH/CPH
25 A607S4M00AP STEAM SENSOR 1P794 APH/CPH, T794SF APH, T784SF APH, T774SF APH,
T764SF APH, H7*4 APH/CPH
26 F612E4W00AP INCANDESCENT LAMP (U) 1125V, 60Hz, 20W
27 J61424T00AP MICRO SWITCH 1(PRIMARY LATCH SWITCH) (V-15G-3C25)
28 J61414T00AP MICRO SWITCH 1(SECONDARY LATCH SWITCH) (D3V-16G-3C25)
29 F61455L00CP THERMAL CUTOUT 1105°C
30 F66264W00AP THERMAL CUTOUT INSULATION
BRACKET
1
31 J61784T00AP MICRO SWITCH 1(SHORT SWITCH) (D3V-1G-2C25)
32 A606Y6G00AP H.V.INVERTER (U) 1
33 F65856K10AP INVERTER BRACKET 1P794 APH, T7*4SF APH
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NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724