Hitachi CG2026S, Service Manual

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6. VERTICAL OUTPUT STAGE WITH TDA8174A
The TDA8174A is a power amplifier circuit for use in 90° and 110° colour deflection systems for 25 to 200Hz field
frequencies, and for 4 : 3 and 16 : 9 picture tubes.
7. VIDEO OUTPUT AMPLIFIER STV5112
The STV5112 consists of three monolithic video output amplifiers. The amplifier can be seen as an operational amplifier
with negative feedback. The advantage of negative feedback is that the amplifier characteristics do not play an important
role up to certain frequencies. The internal flash diodes protect the amplifiers against flash over in the picture tube.
The only protections required at the cathode outputs are a flash resistor and a spark gap.
Furthermore, the device has a high voltage power supply (VDD) and a low voltage one (VCC).
8. POWER SUPPLY (SMPS)
The DC voltages required at various parts of the chassis are provided by an SMPS transformer controlled by the IC
MC44608 which is designed for driving, controlling and protecting switching transistor of SMPS. The transformer produces
115V for FBT input, ±14V for audio output IC, S+3.3, S+5V and 8V for ST92195.
9. POWER FACTOR CORRECTION
Passive components are used for the solution of power factor correction.
10. SERIAL ACCESS CMOS 8K EEPROM 24C08
The 24C08 is a 8Kbit electrically erasable programmable memory (EEPROM), organized as 4 blocks of 256*08 bits.The
memory is compatible with the I²C standard, two wire serial interface which uses a bi-directional data bus and serial clock.
11. CLASS AB STEREO HEADPHONE DRIVER TDA1308
The TDA1308 is an integrated class AB stereo headphone driver contained in a DIP8 plastic package
12. SAW FILTERS
Saw filter type : Model:
G1975M : PAL B/G MONO
K2966M : PAL SECAM B/G/D/K/I MONO
J1981 : PAL-I MONO
K2958M : PAL-SECAM B/G-D/K (38) MONO
K2962M : PAL-SECAM B/G/D/K/I/L/L’ MONO
L9653M : SECAM L/L’ AM MONO (AUDIO IF)
G3967M : PAL-SECAM B/G STEREO (VIDEO IF)
G9353M : PAL-SECAM B/G STEREO (AUDIO IF)
K3958M : PAL-SECAM B/G/D/K/I/L/L’ STEREO (VIDEO IF)
K9356M : PAL-SECAM B/G/D/K/I STEREO (AUDIO IF)
K9656M : PAL-SECAM B/G/D/K/I/L/L’ STEREO (AUDIO IF)
K3958M : PAL I NICAM (VIDEO IF)
K9356M : PAL I NICAM (AUDIO IF)
M1962M : PAL M/N NTSC M MONO
M3953M : PAL M/N NTSC M STEREO (VIDEO IF)
M9370M : PAL M/N NTSC M STEREO (AUDIO IF)
IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM
· ST92195
· STV224X
· TUNER (UV1315, UV1316, UV1336)
· TDA7266L / TDA7266M
· TDA8174A
· STV5112
· MC44608
· MSP34X0D
· 24C08
· TDA1308
· SAW FILTERS
G1975M, K2966M, K2962M, L9653M, G3962M, G9353M, K3958M, K9356M, K9656M, K6263K,
K9652M, M1962M, M3953M, M9370M