Philips FW C100 C37 Service Manual

TRAINING INFORMATION

DISPLAY OVERALL BLOCK DIAGRAM

DISPLAY EC05 TUNER BLOCK DIAGRAM

DISPLAY 3CDC-LC BLOCK DIAGRAM

DISPLAY 3CDC-LC-MB BLOCK DIAGRAM

DISPLAY CASSETTE BLOCK DIAGRAM

Brief Introduction of the Combi Board

A. TRANSFORMER PRIMARY PART

The Transfor mer Primary Circuit provides connections for AC mains supply and primar y wires of transformer.

B. POW ER SUPPLY PART

Power Supply Circ uit consists of recti fiers, c apacitive filt ers, and voltage r egulators. Regulated v oltages include + 5V6, +LED, + 12A, +12M, -33V, PW DN. The +C supply to the power amplifier is not regulated. F1-F2 is the ac supply voltage to the FTD Display filament.

C. SOURCE SELECT AND AMPLIFIER PA RT

a) SHIFT RE G I S TER (AF CONTRO L)

The shift register IC 7402 (HEF 4094BP) deli vers comm ands from the uP to cont rol the AF functions which include source selection (A0 and A1 control lines), DSC modes, DBB, IS and CD_ON (via +CD). Other control lines, such as MUTE, AMPON, STB Y and P WM, are c oming direct ly from the uP on the Front B oar d.

b) SOURCE SELECTION

One of the four sources, namely AUX., T APE, T UNER, or CD, can be selected v ia A0 and A1 lines which control IC7501 (HEF4052BP). Karaoke mic. mixing is connected to the selected source before the signal is amplified with a buffer amplif ier (Tr 7503 and 7504). The source signal i s then split into recordi ng path (for recordi ng on t ape) and main signal path (to the PWM volume control).

c) PWM VOLUME CONT ROL

The discrete v olum e control makes use of four transistors: 7505, 7506, 7507, and 7508 (ON4986 or paired BC557B) and PWM control signal from uP. For good performanc e, transistors for t he left and right channels should be pai red for gain characteristics.

d) SOUND FEAT URE S

Sound features include the DBB, IS, and DSC modes. The sound features are realized with hex-inverter IC7530 (HEF4069UBD) as analog buffer/amplif ier and transistors as electronic switches cont r olled by the shif t registers (AF control).

e) POWER AMPLIFIER

IC7391 (AN7124) is used as a power amplifier.

f) CD ON CO NTROL

This circuit switches on the +CD supply (derived f rom +12A) to CD servo control, HF circuit, and the laser light pen on the CD Module during t he CD mode only.

g) MATRIX SURROUND O UTPUT

The mat rix surround feat ure i s provided onboard. T his feature is optional on certain ty pe versions.

D. KARAOKE PART

a) SIMPLE KARAOKE

This is a one-m ic. mono amplif ier using discrete components. It has level control using a rotary potenti ometer. Thi s feature is av ailable for som e versions only.

E. HEADPHONE PART

a) HEADPHONE OUTPUT

The headphone output is derived from the power amplifier output after the attenuation resistors, which ar e tailored to del iver 25mW out put power into a 32 ohm headphone.

F. CDC KEY PART CDC key buttons and LEDs are provided on this board.

Front Board Application

A53920 FW-C200/12/21/21M/33 A53930 FW-C220/22/34 A53950 FW-C100/21/21M/22/30/33/34/37 A53970 FW-C250/37 A53980 FW-C250/18/19/21 A53990 FW-C280/22/34 A54000 FW-C290/18/19/21 A54340 FW-C200/30

FEATURES: A53920 A53930 A53950 A53970 A53980 A53990 A54000 A54340

RDS - x - - - x - Rotary Encoder x x - x x x x x Jog Encoder - - - x x x x Spectrum Analyzer - - - - - x x Biplaner LED x x - x x x x x Small FTD x x x x x - - x Large FTD - - - - - x x NTC - - - - x - x -

LED Control x x - x x x x x

Variations Table for Front Board

ITEM NO. A53920 A53930 A53950 A53970 A53980 A53990 A54000 A54340

DM21 - - x x x - - DM23 - - - - - - - DM26 x - x x x - x x DM27 - x - - - x - DM29 - - - - x - x 1402 - - - - - x x 1403 x x x x x - - x 1404 x x x x x x x x 1405 x x - - - x x x 1418 - - - - - x x x 1419 - - - - - x x x 1420 - - - - - x x x 1421 x x - - - x x x 1423 x x - - - x x x 1425 - x - - - x - 1426 x x - - - x x x 1427 - x - - - x - 1428 - - x - - - - 1429 - - x - - - - 1430 x x x - - - - 2417 220uF 220uF - 220uF 220uF 220uF 220uF 220uF 2421 22uF 22uF 2,2uF 22uF 22uF 22uF 22uF 22uF 2432 - 100pF - - - 100pF - 2433 - 47pF - - - 47pF - 2462 220nF 220nF - 220nF 220nF 220nF 220nF 220nF 3407 - - - - - 1k 1k 1k 3458 - - - - - 1k 1k 1k 3460 - - - - - 1k 1k 1k 3465 1k 1k - 1k 1k 1k 1k 1k 3471 4R7 4R7 4R7 4R7 4R7 1R 1R 1R 3479 1k 1k - 1k 1k 1k 1k 1k 3483 4R7 4R7 4R7 4R7 4R7 1R 1R 1R 3516 - - 330R - - - - 3518 - - - - - 330R 330R 3524 1k 1k - - - 1k 1k 1k 3539 10k - 10k 10k 10k - 10k 10k 3541 - 1k - - - 1k - 3546 10k - 10k 10k 10k - 10k 10k 3555 10k 10k 10k 10k 10k - - 10k 3575 10k 10k 10k 10k 10k - - 10k 3576 10k 10k 10k 10k 10k - - 10k 3577 - - - - - 12k 12k 3578 - - - - - 5k6 5k6 3586 - - - - - 1k 1k 3588 - - 10k - - - - 3600 5k6 5k6 5k6 5k6 5k6 - - 3602 - - 10k 10k 10k - - 3603 10k 10k 6k8 10k 10k 10k 10k 10k 3613 12k 12k 47k 12k 12k 12k 12k 12k

3616 - - - - 1k - 1k 3617 10k 10k 10k 10k - 10k - 10k 4400 x x x - - - - x 4407 x x - x x - - x 4410 x x x x - x - x 4412 - - - - - x x 4413 - - x - - - - 4417 x x - - - - - x 4436 x x - - - - - x 4588 - - x - - - - 6401 - - - x x x x 6402 - - - x x x x 6404 - - - x x x x 6405 - - - - - x x 6420 - - - - - x x 6422 - - x - - - - 6423 x - - - x - x 6424 - - - x x - - 6428 x x - x x x x x 6433 - - - x x - - 6445 x x - - - - - x 6446 x x - - - - - x 6447 x x - x x - - x 9475 x x x x x - - x 9488 - - - x x x x 9520 - - - x x x x 9523 x x x x x - - x

x = Item in use.