Sharp 37GQ-20S, Service Manual

13

37GQ-20S
37GQ-21S

WAVEFORM MEASUREMENT CONDITION:

Colour bar genetator signal of 70 dB from RF input.

1. The unit of resistance «ohm»is omitted (K=1000
ohms. M= Megaohm).
2. All resistors are 1/8 watt. unless otherwise noted.
3. All capacitors are 

µ

F, unless otherwise noted (P=

µµ

F).

4. The capacitor with Part No. RC-FZ9XXXBMNJ is
designed to with stand 63V.

NOTE:

SERVICE PRECAUTION:

DESCRIPTION OF SCHEMATIC DIAGRAM

SAFETY NOTE:

1. DISCONNECT THE AC PLUG FROM THE AC
OUTLET BEFORE REPLACING PARTS.

2. SEMICONDUCTOR HEAT SINKS SHOULD BE
REGARDED AS POTENTIAL SHOCK HAZARDS
WHEN THE CHASSIS IS OPERATING.

IMPOTANT SAFETY NOTE:

PARTS MARKED WITH  «

»  (

) ARE

IMPORTANT FOR MAINTAINING THE SAFETY
OF THE SET. BE SURE TO REPLACE THESE
PARTS WITH SPECIFIED ONES FOR
MAINTAINING THE SAFETY AND PERFORMAN-
CE OF THE SET.

!

CAUTION
This circuit diagram is original one,
therefore there may be slight difference
from yours.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

CH1    100V    A   2

µ

s 200V   VERT

CH1    FREQ = 100KHz
CH1    P-P     = 504 V

CH1    100V    A   2

µ

s 100V   VERT

CH1    FREQ = 100KHz
CH1    P-P     = 472 V

CH1    2V   A   10

µ

s  -1.00V   VERT

CH1    FREQ = 15.6KHz
CH1    P-P     = 8.56 V

CH1  200V   A   10

µ

s  200V   VERT

CH1    FREQ = 15.6KHz
CH1    P-P     = 1.00 kV

CH1    1V    A   10

µ

s  1.00V   VERT

CH1    FREQ = 15.6KHz
CH1    P-P     = 5.40 V

CH1    1V    A   5ms 2.50 V   VERT

THE AREA ENCLOSED BY THIS LINE (           )
IS DIRECTLY CONNECTED WITH AC MAINS
VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN
ISOLATING TRANSFORMER BETWEEN TV
RECEIVER AND AC LINE TO ELIMINATE
HAZARD OF ELECTRIC SHOCK.

CH1    FREQ = 50.0 Hz
CH1    P-P     = 4.80 V

CH1  500mV   A   5ms 1.00V  VERT

CH1    FREQ = 50.0 Hz
CH1    P-P     = 1.48 V

CH1 500mV  A  5ms -500mV  VERT

CH1    FREQ = 50.0 Hz
CH1    P-P     = 1.94 V

CH1 10V   A   5ms -10.0mV  VERT

CH1    FREQ = 50.0 Hz
CH1    P-P     = 38.4 V

CH1    1V   A   5ms  2.50 V    VERT

CH1    FREQ = 1.00 KHz
CH1    P-P     = 4.44 V

CH1   5V  A   500

µ

s  0.0 V   VERT

CH1    FREQ = 412 Hz
CH1    P-P     = 16.8 V

CH1   500mV  A   10

µ

s  TVFLD  25

CH1    FREQ = 15.6 KHz
CH1    P-P     = 1.84 V

CH1   20V   A    10

µ

s  150 V  VERT

CH1    FREQ = 15.6 KHz
CH1    P-P     = 74.4 V

CH1   20V   A    10

µ

s  150 V  VERT

CH1    FREQ = 15.6 KHz
CH1    P-P     = 72.8 V

CH1    FREQ = 15.6 KHz
CH1    P-P     = 70.4 V

CH1   20V   A    10

µ

s  150 V  VERT

gnd

gnd

gnd

gnd

gnd

gnd

gnd

gnd

gnd

gnd

gnd

gnd

gnd

gnd

gnd