SANYO VPC-C1 Service Manual 00-27

1-4. ST1 STROBE CIRCUIT DESCRIPTION

1. Charging Circuit

When UNREG power is supplied to the charge circuit and the
CHG signal from microprocessor becomes High (3.3 V), the
charging circuit starts operating and the main electorolytic
capacitor is charged with high-voltage direct current.
However, when the CHG signal is Low (0 V), the charging
circuit does not operate.

1-1. Power switch

When the CHG signal switches to Hi, Q5407 turns ON and
the charging circuit starts operating.

1-2. Power supply filter

C5401 constitutes the power supply filter. They smooth out
ripples in the current which accompany the switching of the
oscillation transformer.

1-3. Oscillation circuit

This circuit generates an AC voltage (pulse) in order to in­crease the UNREG power supply voltage when drops in cur­rent occur. This circuit generates a drive pulse with a frequency
of approximately 50-100 kHz. Because self-excited light omis­sion is used, the oscillation frequency changes according to
the drive conditions.

2. Light Emission Circuit

When RDY and TRIG signals are input from the ASIC expan­sion port, the stroboscope emits light.

2-1. Emission control circuit

When the RDY signal is input to the emission control circuit,
Q5409 switches on and preparation is made to let current
flow to the light emitting element. Moreover, when a STOP
signal is input, the stroboscope stops emitting light.

2-2. Trigger circuit

When a TRIG signal is input to the trigger circuit, D5405
switches on, a high-voltage pulse of several kilovolts is gen­erated inside the trigger circuit, and this pulse is then applied
to the light emitting part.

2-3. Light emitting element

When the high-voltage pulse form the trigger circuit is ap­plied to the light emitting part, currnet flows to the light emit­ting element and light is emitted.

Beware of electric shocks.

1-4. Oscillation transformer

The low-voltage alternating current which is generated by the
oscillation control circuit is converted to a high-voltage alter­nating current by the oscillation transformer.

1-5. Rectifier circuit

The high-voltage alternating current which is generated at
the secondary side of T5401 is rectified to produce a high­voltage direct current and is accumulated at electrolytic ca­pacitor C5412.

1-6. Voltage monitoring circuit

This circuit is used to maintain the voltage accumulated at
C5412 at a constance level.
After the charging voltage is divided and converted to a lower
voltage by R5417, R5419 and R5420, it is output to the mi­croprocessor as the monitoring voltage VMONIT. When this
VMONIT voltage reaches a specified level at the micropro­cessor, the CHG signal is switched to Low and charging is
interrupted.

– 6 –

1-5. SYA CIRCUIT DESCRIPTION

1. Configuration and Functions

For the overall configuration of the SYA block, refer to the block diagram. The SYA block centers around a 8-bit microprocessor
(IC301), and controls camera system condition (mode).
The 8-bit microprocessor handles the following functions.

1. Operation key input, 2. Clock control and backup, 3. Power ON/OFF, 4. Storobe charge control, 5. Signal input and output for
zoom and lens control.

Pin

1~4

5

6

7

8

9

10

11

12
13

14

15

16

17

18

19

20

21

22

23

24 VDD

25 AVSS

26~29 SCAN IN 3~0

30

31 BAT_TMP

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

STBY_LED (GREEN)

Signal

SCAN OUT 0~3

P ON

PA ON

LCD ON

BL_ON

VSS

VDD

NOT USED

STBY_LED (RED)

AVREF_ON

SI

SO

SCK

PRG SI

PRG SO

PRG SCK

NOT USED

CRADLE TRIG

CHG ON

INT_TMP

CHG VOL

BATTERY

AVREF

AVDD

RESET

XCOUT

XCIN

IC

XOUT

XIN

VSS

BAT OFF

SREQ

SCAN IN6

IRIN

NOT USED

BOOT

I/O

O

O

O

O

O

O

O

O

O

I/O

O

I/O

O

O

O

I/O

Outline

Key matrix output

Digital power ON/OFF control H : ON

Analog power ON/OFF control H : ON

LCD power ON/OFF control H : ON

LCD backlight ON/OFF

-

-

-

I

I

-

I

-

-

I

I

I

I

I

-

-

I

I

I

I

-

I

I

I

I

-

GND

VDD

-

Stand-by LED (green) control L : ON

Stand-by LED (red) control L : ON

A/D converter standard voltage control L : ON

Receiving data (from ASIC)

Sending data (to ASIC)

Communication clock (to ASIC)

Flash memory write receiving data

Flash memory write sending data

Flash memory write communication clock

-

Power ON/OFF signal from cradle

Flash charge control H : ON

VDD

Analog GND

Key scan input

Internal temperature detection input (analog input)

Battery internal thermister detection temperature input (analog input)

Flash charge voltage detection (analog input)

Battery voltage detection (analog input)

Analog standard voltage input terminal

A/D converter analog power terminal

Reset input

Clock oscillation terminal (32.768 kHz)

Clock oscillation terminal

Flash memory writing voltage

Main clock oscillation terminal (4MHz)

Main clock oscillation terminal

GND

Battery OFF detection

Serial communication requirement (from ASIC)

Key scan input 6

Infrared remote control receiving signal

-

Compulsion boot control

See next page →

– 7 –

49 AV JACK

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

DC IN

CARD

NOT USED

CHG_CNT

SCAN IN 4

SCAN IN 5

SUB 1

USB

LCD ON2 O

NTZPAL O NTSC/PAL switch H : NTSC

BACKUP_CNT

ASIC TEST 0

ASIC TEST 1

ASIC RESET2

ASIC RESET

I

O DC jack/battery detection input L : DC jack insertion

I

-

O

O

I

I/O

I

O

O ASIC reset control signal 0

O ASIC reset control signal 1

O

O

Table 5-1. 8-bit Microprocessor Port Specification

AV jack connection detection H : AV jack detection

SD card insertion detection L : Insertion

-

Charge enabling signal to cradle H : Permission

Key scan input 4

Key scan input 5

Communication line to main

USB connector detection L : USB detecion

LCD ON/OFF control 2 H : ON

Backup battery charge control L : Charge ON

ASIC reset control signal 2

ASIC reset singal

2. Internal Communication Bus

The SYA block carries out overall control of camera operation by detecting the input from the keyboard and the condition of the
camera circuits. The 8-bit microprocessor reads the signals from each sensor element as input data and outputs this data to the
camera circuits (ASIC) or to the LCD display device as operation mode setting data. Fig. 5-1 shows the internal communication
between the 8-bit microprocessor, ASIC and SPARC lite circuits.

ASIC RESET

S. REQ

8-bit

Microprocessor

Fig. 5-1 Internal Bus Communication System

ASIC SO

ASIC SI

ASIC SCK

ASIC TEST 1

ASIC TEST 2

ASIC TEST 0

3. Key Operaiton

For details of the key operation, refer to the instruction manual.

SCAN
OUT

SCAN
IN

0

1

0

← LEFT

TELE

1

→ RIGHT

WIDE

2

↑ UP

REC

2

3

3

↓ DOWN

1st

4

SET

2nd

ASIC

5

MENU

CAMERA

6

-

PLAY

POWER ON

PANEL OPEN

Table 5-2. Key Operation

– 8 –

4. Power Supply Control

The 8-bit microprocessor controls the power supply for the overall system.
The following is a description of how the power supply is turned on and off. When the battery is attached, a regulated 3.2 V
voltage is normally input to the 8-bit microprocessor (IC301) by IC302, so that clock counting and key scanning is carried out
even when the power switch is turned off, so that the camera can start up again. When the battery is removed, the 8-bit micro­processor operates in sleep mode using the backup lithum battery. At this time, the 8-bit microprocessor only carries out clock
counting, and waits in standby for the battery to be attached again. When a switch is operated, the 8-bit microprocessor supplies
power to the system as required.
The 8-bit microprocessor first sets both the P (A) ON signal at pin (6) and the P ON signal at pin (5) to high, and then turns on the
DC/DC converter. After this, low signals are output from pins (61), (62), (63) and (64) so that the ASIC is set to the reset condition.
After this these pins set to high, and set to active condition. If the LCD monitor is on, the LCD ON 2 signal at pin (58) set to high,
and the DC/DC converter for the LCD monitor is turned on. Once it is completed, the ASIC returns to the reset condition, all DC/
DC converters are turned off and the power supply to the whole system is halted.

ASIC,

memory

Power voltage

Power OFF

Power switch ON-

Auto power OFF

CAMERA

LCD finder

Play back

Table 5-3. Camera Mode

Note) 4 MHz = Main clock operation, 32 kHz = Sub clock operation

3.3 V 1.8 V

OFF

OFF

ON

ON

CCD

5 V (A)

+12 V etc.

OFF

OFF

ON

OFF

8 bit

CPU

3.2 V

(ALWAYS)

32KHz OFF

32KHz OFF

4 MHz ON

4 MHz ON

MONITOR

+8.5 V etc.

LCD

5 V (L)

– 9 –

2. DISASSEMBLY

2-1. REMOVAL OF CABINET LEFT, CP1 BOARD AND TB1 BOARD

1. Cover battery

2. Five screws 1.7 x 5

3. Screw 1.7 x 2

4. Two screws 1.7 x 3

5. Cabinet left

6. Cover card

7. Screw 1.7 x 3

8. Two screws 1.7 x 4

9. Shield CP1

10. Screw 1.7 x 4

4

5

11. Connector & FPC

12. CP1 board

13. Connector

14. Two FPCs

15. Three screws 1.7 x 4

16. Screw 1.7 x 3

17. Connector

18. TB1 board

13

17

11

11

15

14

16

3

14

18

2

7

10

12

9

6

8

2

1

– 10 –

2-2. REMOVAL OF ST1 BOARD AND CA1 BOARD

1. Screw 1.7 x 3

2. Unit control

3. Screw 1.7 x 4

4. Flexible PWB

5. Spacer wire flash

6. Remove the solder.

7. ST1 board

8. Cabinet front

9. Three screws 1.4 x 3.5

10. CA1 board

2

9

10

4

1

3

8

7

6

pink

black

gray

5

– 11 –

2-3. REMOVAL OF CABINET RIGHT, LCD, VF1 BOARD AND TB2 BOARD

16

15

19
26

20

21

18

26

25

29

23

1. Screw 1.7 x 3

2. Spring button

3. Button LCD

4. Screw 1.7 x 4

5. Button power

6. Screw 1.7 x 2.5

7. Screw 1.7 x 3

8. Two screws 1.7 x 2

9. Holder joint

10. Speaker

11. Two screws 1.7 x 2.5

12. Cover joint base

13. Cabinet right

14. Screw 1.7 x 2

15. Two dec screws

16. Two screws 1.7 x 2.5

17. Four screws 1.7 x 3

30

12

8

11

5

3

24

14

4

13

2

1

6

7

10

9

22

17

27

17

18. Cover LCD front

19. LCD

20. Two screws 1.7 x 2.5

21. Holder monitor

22. Screw 1.7 x 2.5

23. Two connectors

24. Connector

25. FPC

26. Remove the solder.

27. VF1 board

28. Cover LCD back

29. Screw 1.7 x 1.8

30. TB2 board

17

28

– 12 –

2-4. BOARD LOCATION

CA1 board

CP1 board

TB2 board

VF1 board

ST1 board

TB1 board

– 13 –