Sony srf hm 55 service manual

Page 1

SRF-HM55

SERVICE MANUAL

US Model
Canadian Model

MICROFILM

SPEClFICATIONS

Frequency range (Channel Step)
FM:87.5~108 MHz (0.1 MHz}
AM2530-1710 kHz (10 kHz)

FM:87.5-108 MHz (0.05 MHZ)
AM:531-1710 kHz (9 kHz)
Headphone type
Dynamic
Power output
19.7 mW + 19.7 mW (at 10%
harmonic distortion)

Power requirement
3 V DC
two size AA (R6) batteries
Battery life
Approx. 33 hours. with Sony
SUM-3 (NS) batteries
Mass Approx. 227 g (8 oz)
including batteries

SERVICING NOTE

Flexible Circuit Board Repairing
~ Keep the temperature of the soldering iron around 270°C
during repairing.
~ Do not touch the soldering iron on the same conductor of
the circuit board (Within 3 times).
- Be careful not to apply force on the conductor when sol-
dering or unsoldering.

Notes on chip component replacement
Never reuse it disconnected chip component.
' Notice that the minus side of a tantalum capacitor may be
damaged by heat

tThe frequency display is raised or lowered by steps of 0.1 MHz. (Example: Frequency

88.05 MHz is displayed as 88.0 MHz".)

Design and specifications subject to change without notice.

FM STEREfl/ AM PLL

SYNTHESIZEI] HEADPHllNE RECEIVER

SONY;

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SRF-HM55

SERVICE NOTE

[Caution on Service]

Drip-proof freatment
Be sure to execute the following, when the cabinet is removed dur-

ing service.
Applicator SONY Grease SGL-505 (7-662-010-04) to the hatched
portion shown in figure using an applicator, etc.

CABINET (FRONT) ASSY (L) CAB/NET (FRONT) ASSY (R)

Notes on chip component replacement

0 Never reuse a disconnected chip component,

. Notice that lhe minus side of a tantalum capacitor may be
damaged by heall