Panasonic AG-TL750E / AG-TL750B Service Manual ▷ View online
1-7
Table 1-3-4(a)
E-03
E-02
E-01
SP REEL
ERROR
ERROR
UNLOADING
ERROR
ERROR
LOADING
ERROR
ERROR
Rotary encoder
↓
MAIN board
IC606 4 LS1
5 LS2
6 LS3
7 LS4
IC606 4 LS1
5 LS2
6 LS3
7 LS4
Loading does not
complete.
complete.
Unloading does
not complete.
not complete.
Supply reel does
not rotate.
not rotate.
Supply reel FG
↓
MAIN board
IC601 1 SUP FG
IC601 1 SUP FG
CPU checks the rotary encoder
output to see the mechanism
position data and identifies the
error when loading does not
complete in 8 seconds.
output to see the mechanism
position data and identifies the
error when loading does not
complete in 8 seconds.
CPU checks the rotary encoder
output to see the mechanism
position data and identifies the
error when unloading does not
complete in 8 sec.
output to see the mechanism
position data and identifies the
error when unloading does not
complete in 8 sec.
CPU identifies error when supply
reel FG has not been detected for
specified period of time in a mode
in which the SP reel should rotate.
reel FG has not been detected for
specified period of time in a mode
in which the SP reel should rotate.
3H : Approx. 5 sec.
L12H : Approx. 18 sec.
L24H : Approx. 36 sec.
L24H : Approx. 36 sec.
24H : Approx. 36 sec.
48H : Approx. 72 sec.
72H : Approx. 2 min.
48H : Approx. 72 sec.
72H : Approx. 2 min.
120H : Approx. 3 min.
168H : Approx. 4 min.
240H : Approx. 6 min.
168H : Approx. 4 min.
240H : Approx. 6 min.
Power goes off
automatically.
automatically.
Power goes off
automatically.
automatically.
Power goes off
automatically.
automatically.
Loading motor failure,
MDA (IC602 on MAIN board) failure,
Power (MOTOR 12 V) defect,
Circuit protector (CP601 on MAIN board)
disconnection,
Loading belt defect,
Mechanism part caught or stuck,
Cassette tape defect.
MDA (IC602 on MAIN board) failure,
Power (MOTOR 12 V) defect,
Circuit protector (CP601 on MAIN board)
disconnection,
Loading belt defect,
Mechanism part caught or stuck,
Cassette tape defect.
Capstan motor or drive circuit defect,
Belt (Capstan), clutch ass'y or idler gear
unit defect,
Tape cut.
Belt (Capstan), clutch ass'y or idler gear
unit defect,
Tape cut.
E-04
DRUM
ERROR
ERROR
Drum motor
does not rotate.
does not rotate.
Drum PG/FG
↓
MAIN board
TP616 DPG
TP616 DPG
CPU identifies error when drum
FG has not been detected for
more than 3 seconds in a mode in
which the drum motor should
rotate.
FG has not been detected for
more than 3 seconds in a mode in
which the drum motor should
rotate.
Power goes off
automatically.
automatically.
Drum ass'y defect,
Servo circuit defect,
Power (MOTOR 12 V) defect,
Circuit protector (CP601 on MAIN board)
disconnection.
Servo circuit defect,
Power (MOTOR 12 V) defect,
Circuit protector (CP601 on MAIN board)
disconnection.
E-06
CAPSTAN
ERROR
ERROR
Capstan motor
does not rotate.
does not rotate.
Capstan FG
↓
MAIN board
TP617 CFGA
TP617 CFGA
CPU identifies error when capstan
FG has not been detected for
more than 2 seconds when pinch
roller is ON in a mode in which the
capstan should rotate.
FG has not been detected for
more than 2 seconds when pinch
roller is ON in a mode in which the
capstan should rotate.
Power goes off
automatically.
automatically.
Capstan motor defect,
Servo circuit defect,
Power (MOTOR 12 V) defect,
Circuit protector (CP601 on MAIN board)
disconnection.
Servo circuit defect,
Power (MOTOR 12 V) defect,
Circuit protector (CP601 on MAIN board)
disconnection.
E-07
EJECT
ERROR
ERROR
Ejection does not
occur.
occur.
Cassette sensor
↓
MAIN board
IC606 $
IC606 $
REC SAFETY
switch
switch
↓
MAIN board
IC606 %
IC606 %
When ejection does not complete
in 8 seconds.
in 8 seconds.
Cassette sensor output should be
0 V at the intake end position and
5 V in other positions.
5 V in other positions.
REC SAFETY switch should be 0 V
during ejection and 5 V at the
eject end position.
during ejection and 5 V at the
eject end position.
Cassette is
absorbed then
power goes off
automatically.
absorbed then
power goes off
automatically.
Cassette housing failure,
Worm clutch ass'y defect,
Power (MOTOR 12 V) defect,
Circuit protector (CP601 on MAIN board)
disconnection.
Worm clutch ass'y defect,
Power (MOTOR 12 V) defect,
Circuit protector (CP601 on MAIN board)
disconnection.
E-08
DEW
ERROR
ERROR
Condensation of
dew.
dew.
DEW sensor
↓
MAIN board
IC601 A
IC601 A
Dew error caused by
condensation is identified when
pin 86 of IC601 is higher than 4 V.
condensation is identified when
pin 86 of IC601 is higher than 4 V.
Dew error disappears when pin 86
of IC601 is lower than 3V.
of IC601 is lower than 3V.
Cassette is
ejected, drum
starts rotation and
cassette will not
be accepted until
the condensation
disappears.
ejected, drum
starts rotation and
cassette will not
be accepted until
the condensation
disappears.
If the error display does not disappear, the
dew sensor may be defective.
dew sensor may be defective.
E-13
TAPE
DEFECTIVE
DEFECTIVE
Tape is cut.
Begin sensor
↓
MAIN board
IC601 U BEGIN
IC601 U BEGIN
End sensor
↓
MAIN board
IC601 I END
IC601 I END
This error is identified when both
the tape begin and end sensors
detect leader (the level becomes
Low) when a cassette is inserted.
the tape begin and end sensors
detect leader (the level becomes
Low) when a cassette is inserted.
Cassette is
ejected then
power goes off
automatically.
ejected then
power goes off
automatically.
Tape cut,
Sensor defect.
Sensor defect.
E-05
TU REEL
ERROR
ERROR
Take-up reel does
not rotate.
not rotate.
Take-up reel FG
↓
MAIN board
IC601 2 TU FG
IC601 2 TU FG
CPU identifies error when take-up
reel FG has not been detected for
specified period of time in a mode
in which the TU reel should rotate.
reel FG has not been detected for
specified period of time in a mode
in which the TU reel should rotate.
3H : Approx. 5 sec.
L12H : Approx. 18 sec.
L24H : Approx. 36 sec.
L24H : Approx. 36 sec.
24H : Approx. 36 sec.
48H : Approx. 72 sec.
72H : Approx. 2 min.
48H : Approx. 72 sec.
72H : Approx. 2 min.
120H : Approx. 3 min.
168H : Approx. 4 min.
240H : Approx. 6 min.
168H : Approx. 4 min.
240H : Approx. 6 min.
Power goes off
automatically.
automatically.
Capstan motor or drive circuit defect,
Belt (Capstan), clutch ass'y or idler gear
unit defect,
Tape cut.
Belt (Capstan), clutch ass'y or idler gear
unit defect,
Tape cut.
Display
Description
Sensors
Detection Method
Possible Causes
Error
Code
Code
Operation after
Detection
1-8
Warning Situations That Are Not Recorded in the Emergency History
In case of the following errors, the applicable error code is displayed in the FDP on the front panel.
In case of the following errors, the applicable error code is displayed in the FDP on the front panel.
Table 1-3-4(b)
E-09
Pre-amp. circuit
↓
MAIN board
IC601 S
↓
MAIN board
IC601 S
Recording check
error
error
This error is identified when recording
check finds that the played FM level is
low (pin 87 of IC601 is below 0.4 V).
check finds that the played FM level is
low (pin 87 of IC601 is below 0.4 V).
E-09 is displays about
10 seconds.
The cleaner should be
activated.
10 seconds.
The cleaner should be
activated.
Video head is dirty or its service life expired.
Preamplifier circuit failure.
Preamplifier circuit failure.
E-10
Backup battery
low power error
low power error
Battery
↓
MAIN board
IC608 3
↓
MAIN board
IC608 3
This error is identified when the battery
voltage is below 2.75 V.
voltage is below 2.75 V.
E-10 is displays when
power is switched OFF.
power is switched OFF.
Battery capacity is insufficient.
Battery is not loaded.
Battery is not loaded.
E-11
Video signal input
error
error
MAIN board
IC601 p
IC601 p
MAIN board
IC601 &*
IC601 &*
This error is identified when there is no
video input at VIDEO IN jack.
video input at VIDEO IN jack.
Video signal is not supplied.
E-12
EEPROM write
error
error
This error is identified when a verification
error occurs after EEPROM write.
error occurs after EEPROM write.
E-12 is displayed when
power is switched ON.
power is switched ON.
EEPROM defect,
CPU
CPU
→ EEPROM communication line defect.
Error
Code
Code
Description
Sensors
Detection Method
Possible Causes
Operation after
Detection
E-11 is displayed when
power is switched ON.
power is switched ON.
1.3.5
Mecha check mode
This screen is used to diagnose the mechanism operation sen-
sors without using a measuring tool.
sors without using a measuring tool.
Table 1-3-5(a)
(MODE)
Previous and current modes of the VCR.
–
(ENCD)
Rotary encoder output level.
MAIN board
IC606 4 LS1
IC606 5 LS2
IC606 6 LS3
IC606 7 LS4
IC606 4 LS1
IC606 5 LS2
IC606 6 LS3
IC606 7 LS4
The H/L display varies according to the mechanism position.
(ENCD)
Display
ATOFF
OPOFF
NOCAS
EJECT
FF
REW
OPOFF
NOCAS
EJECT
FF
REW
Description
→ AUTO OFF
→ OPERATE OFF
→ NO CASSETTE
→ EJECT
→ FF
→ REW
Display
PLAY
RPLAY
STOP
STILL
S.FWD
R.REV
RPLAY
STOP
STILL
S.FWD
R.REV
Description
→ PLAY
→ REVERSE
→ STOP
→ STILL
→ SHUTTLE FWD
→ SHUTTLE REV
(REF.)
Normal output level of rotary encoder.
(SAFE)
REC SAFETY switch status.
MAIN board
IC606 %
IC606 %
–
ON:
OFF:
When a cassette with a broken safety tab is inserted or during cassette
loading/ejection.
When a cassette with integral safety tab is inserted or when no cassette
is loaded.
loading/ejection.
When a cassette with integral safety tab is inserted or when no cassette
is loaded.
ON:
OFF:
OFF:
When a cassette is inserted.
When no cassette is loaded or during cassette loading/ejection.
When no cassette is loaded or during cassette loading/ejection.
(CASS)
Cassette switch status.
MAIN board
IC606 $
IC606 $
(BGIN)
Tape begin sensor status.
MAIN board
IC601 U
IC601 U
ON:
OFF:
OFF:
When the leader tape is detected or when no cassette is loaded.
When the magnetic tape section is detected.
When the magnetic tape section is detected.
ON:
OFF:
OFF:
When the leader tape is detected or when no cassette is loaded.
When the magnetic tape section is detected.
When the magnetic tape section is detected.
ON:
OFF:
OFF:
When the capstan motor is rotating.
When the capstan motor is stopped.
When the capstan motor is stopped.
FWD:
REV:
REV:
During forward rotation.
During reverse rotation.
During reverse rotation.
(END)
Tape end sensor status.
MAIN board
IC601 I
IC601 I
(CAPN)
Capstan motor operation mode.
MAIN board
TP617
TP617
(F/R)
Capstan motor rotation direction.
MAIN board
TP610
TP610
(SPFG)
SP reel FG sensor status.
MAIN board
IC601 1
IC601 1
H/L are alternated when the reel disk rotates.
The alternation rate increases when the rotation speed increases.
The alternation rate increases when the rotation speed increases.
If the tape speed during FF or REW operation does not decelerate near the end
or the beginning of the tape,the detection by one of these sensors may be
defective.
In this case, check if the reel FG and capstan FG signals are supplied normally
to the CPU.
or the beginning of the tape,the detection by one of these sensors may be
defective.
In this case, check if the reel FG and capstan FG signals are supplied normally
to the CPU.
(TUFG)
TU reel FG sensor status.
MAIN board
IC601 2
IC601 2
–
–
–
(SP. D)
SP reel winding diameter (in mm).
(TU. D)
TU reel winding diameter (in mm).
(REMN)
Current remaining tape (in min.) assuming that
the tape speed is SP.
the tape speed is SP.
Item
Displayed Information
Input Pin
Check Method
H H L L
LS4
LS3
LS2
LS1
LS3
LS2
LS1
H H L L
LS4
LS3
LS2
LS1
LS3
LS2
LS1
(REF.)
(MODE) EJECT
(ENCD) HHLL
(SAFE) ON
(BGIN) ON
(ENCD) HHLL
(SAFE) ON
(BGIN) ON
(CAPN) OFF
(SPFG) L
(SP. D) 070
(REMN) 000
(SPFG) L
(SP. D) 070
(REMN) 000
[MECHA CHECK MODE]
→ NOCAS
(REF.) HHLL
(CASS) OFF
(END) ON
(REF.) HHLL
(CASS) OFF
(END) ON
(F/R) FWD
(TUFG) H
(TU. D) 070
(TUFG) H
(TU. D) 070
1-9
Switch and Sensor Layout
Fig. 1-3-5(b)
Mechanism Mode Chart
Fig. 1-3-5(c)
Tape end sensor
Supply reel FG
Take-up reel FG
Rotary encoder
S cassette switch
Cassette switch
Tape begin sensor
REC SAFETY switch
(Supply side)
Center
(Take-up side)
Center
(Take-up side)
UP
DOWN
PRESS
FREE
LOAD END
UNLOAD END
ON
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
CONTACT OFF
ON
CONTACT OFF
UP
DOWN
W ON
PRELOAD OFF
PRELOAD OFF
Pole base ass'y
0
°
0 mm
C-LOAD
Control cam
rotation speed
rotation speed
Control plate
Displacement
system
Displacement
system
30.6
°
4 mm
C-INS
C-INS
LOADING
160.4
°
21 mm
W-FWD
183.3
°
24 mm
FWD
198.6
°
26 mm
S. FOR
S. FOR
244.5
°
32 mm
S. REV
S. REV
259.7
°
34 mm
REV
286.5
°
37.5 mm
STOP
328.5
°
43 mm
FF/REW
Pinch roller arm ass'y
(UP/DOWN)
(UP/DOWN)
Pinch roller
Tension arm ass'y
Tension arm
(spring)
(spring)
Idlers
Idler
(UP/DOWN)
(UP/DOWN)
Main brake ass'y
(Supply side)
(Supply side)
Main brake ass'y
(Take-up side)
(Take-up side)
Sub-brake ass'y
(Supply side)
(Supply side)
Sub-brake ass'y
(Take-up side)
(Take-up side)
Cassette housing
drive gear
drive gear
Capstan brake
Take-up lever
Guide arm
Ejection completion
position
position
Step slow, Still
Play/Rec., Rec.-pause,
Search Forward, Stop
(Pinch ON)
Search Forward, Stop
(Pinch ON)
Intake completion
position
Assembly position
position
Assembly position
Cleaner ON
Search Reverse,
Reverse
Reverse
FF/REW
Stop (Pinch OFF)
1
LS2
1
1 1
1
1
1
1
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
LS3
LS4
Rotar
y encoders
1
1 1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
LS1
1-10
Symbol No.
Board Address
Symptom
CP601
16E
Loading motor and drum motor do
not rotate. When a cassette tape is
not inserted, warning message “E-
01” is displayed. When a cassette
tape is inserted, warning message
“E-02” is displayed.
not rotate. When a cassette tape is
not inserted, warning message “E-
01” is displayed. When a cassette
tape is inserted, warning message
“E-02” is displayed.
CP801
16C
The information is not displayed in
the front panel FDP.
the front panel FDP.
CP802
17D
Operate on is impossible. Drum
motor does not rotate. When a cas-
sette tape is inserted, warning mes-
sage “E-02” is displayed.
motor does not rotate. When a cas-
sette tape is inserted, warning mes-
sage “E-02” is displayed.
1.4
LITHIUM BACKUP BATTERY
1.4.1
Battery Replacement Caution
Do not leave the unit without restoring the power supply after
the lithium battery has been replaced with the power cord un-
plugged, as this causes the backup current to flow continuously
and the lithium battery life will be reduced. Be sure to turn the
power ON after replacing the lithium battery.
The unit incorporates a function for storing the date of a lithium
battery replacement in the memory. After replacing the lithium
battery, also be sure to execute this function by referring to “7.
BATTERY” in section 1.3.3
the lithium battery has been replaced with the power cord un-
plugged, as this causes the backup current to flow continuously
and the lithium battery life will be reduced. Be sure to turn the
power ON after replacing the lithium battery.
The unit incorporates a function for storing the date of a lithium
battery replacement in the memory. After replacing the lithium
battery, also be sure to execute this function by referring to “7.
BATTERY” in section 1.3.3
1.4.2
Time/Date Backup
When the power supply to the unit has failed due to an electrical
power failure or the unplugging of the power cord, this unit uses
the lithium battery to back up the CPU (IC601 on the MAIN board)
in order to protect the clock operation and set data. Typically a
lithium battery is capable of backing up the memory data for about
2 years.When the lithium battery voltage drops below 2.85 V, this
unit displays an error message “E-10” to notify the replacement
timing. When the lithium battery is replaced with the power cord
unplugged, the CPU will be reset: In this case, the time setting of
the unit after the battery replacement is reset.
power failure or the unplugging of the power cord, this unit uses
the lithium battery to back up the CPU (IC601 on the MAIN board)
in order to protect the clock operation and set data. Typically a
lithium battery is capable of backing up the memory data for about
2 years.When the lithium battery voltage drops below 2.85 V, this
unit displays an error message “E-10” to notify the replacement
timing. When the lithium battery is replaced with the power cord
unplugged, the CPU will be reset: In this case, the time setting of
the unit after the battery replacement is reset.
1.5
EEPROM
IC607 on the MAIN board is an EEPROM capable of electrical
erasure/write operations. This EEPROM stores the following
data.
(1) Hour meter data
erasure/write operations. This EEPROM stores the following
data.
(1) Hour meter data
Data as displayed under item “HOUR METER” in the SERV-
ICE MENU, and the “HOUR METER” data in the user menu.
ICE MENU, and the “HOUR METER” data in the user menu.
(2) Adjustment data
Data of the adjustment items displayed under items “SERVO
ADJUST” and “EVR ADJUST” in the SERVICE MENU.
When EEPROM is replaced, reset the adjustment data of
the EVR ADJUST before performing all the adjustments
shown in the following tables.
ADJUST” and “EVR ADJUST” in the SERVICE MENU.
When EEPROM is replaced, reset the adjustment data of
the EVR ADJUST before performing all the adjustments
shown in the following tables.
1
SERVO ADJUST
Section
Adjustment Item
3.4.1
SW point adjustment
3.4.2
V-lock adjustment
3.4.3
Slow tracking preset adjustment
3.4.4
Skew adjustment
2
EVR ADJUST
Section
Adjustment Item
3.5.1
AGC level adjustment
3.5.3
Sub-emphasis input level adjustment
3.5.4
White & dark clip adjustment
3.5.5
Carrier & deviation adjustments
3.5.6
S-VHS ET SP REC FM level adjustment
3.5.7
S-VHS SP REC FM level adjustment
3.5.8
Pilot burst level adjustment
3.5.9
S-VHS PB Y level adjustment
3.5.11
S-VHS ET SP REC color level adjustment
3.5.12
S-VHS SP REC color level adjustment
(3) Emergency history data
Data of the history of the last 4 emergencies as displayed
under item “EMERGENCY HISTORY” in the SERVICE
MENU.
under item “EMERGENCY HISTORY” in the SERVICE
MENU.
(4) Menu switch setting data
Data set under item “FUNCTION” in the SERVICE MENU,
and setting data in the user menu.
and setting data in the user menu.
1.6
CIRCUIT PROTECTORS
The MAIN board has circuit protectors as shown in Fig. 1-6.
Fig. 1-6
Table 1-6 shows symptoms when each circuit protector wire is
disconnected.
disconnected.
1.7
RESETTING THE MICROCOMPUTER IN CASE OF
A RUNAWAY
A RUNAWAY
This unit uses a lithium battery to back up the microcomputer
(IC601 on the MAIN board). Therefore, in case the microcom-
puter runs away, simply unplugging the power cord does not
reset it but it is also required to remove the lithium battery tem-
porarily as described in section 1.2.5
(IC601 on the MAIN board). Therefore, in case the microcom-
puter runs away, simply unplugging the power cord does not
reset it but it is also required to remove the lithium battery tem-
porarily as described in section 1.2.5
Table 1-6
T1
F1
0 1 SW REG.
0 3 MAIN
5 1
DECK
TERMINAL
DECK
TERMINAL
CAP. MDA
5 7
P/R
4 3
7
4
3
7
CN51
6V
12V
M12V
CN801
CN604
4
3
CP801
CP802
+5V
+12V
CP601
MDA
13,14
7, 8
DRU. MDA
5 8
CAPSTAN
MOTOR
DRUM
MOTOR
M
M
LOADING
MOTOR
MOTOR
M
(AL5.8V)
(AL12V)
* For the resetting method of the EVR ADJUST adjustment
data, see section 3.3.2 (7).
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