Sony MHC-6800 Service Manual page 85

SECTION 1
SERVICING NOTES
NOTES ON LASER DIODE EMISSION CHECK
1. Make POWER switch on with no disc inserted and disc
table closed.
2. Confirm that the following operation is performed while
observing the objective lens.
Confirm that laser beam is spread.
© Up and down motion of the objective lens. (3 times)
© POWER SUPPLY FOR SERVICING
This set does not have its own power unit. It is operated by
Power
supply from
the amplifier
(TA-H6800E,
TA-
H6800N) used in this series. Therefore, when performing
service such as continuity repair, connect the set with the
amplifier (TA-H6800E, TA-H6800N).
© HOW TO FORCEFULLY TURN POWER ON
The equipment is not provided with any power switch.
Therefore, power ON/OFF is controlled in the amplifier
side. However, even without an amplifier, power is supplya-
ble to the equipment according to the following methods
provided any type of power is available, e.g. using a special
jig or supplying the 4 types of voltages individually.
+ To activate the tuner unit, simultaneously press "—"
switch and "kk"
switch. (The CD unit will stop its
function.)
APPLY appox.
18.6Vac,
SYSTEMCONTROL
CLLLLLLLLLA,
© SERVICE MODE FOR FL TUBE CHECK
By pressing "BAND" switch and "& OPEN/CLOSE"
switch at the same time, the FL display tube is totally lit.
VOLTAGE MEASUREMENT OF THE TUNER/TCBO11
BOARD
When performing voltage measurement of the TUNER and
TCBO11 boards, prepare the following jigs (extension
cables) :
1) Extension cable for 4-pin application (J-8000-026-A) X3
lines.
2) Extension cable for 8-pin application (J-8000-027-A) x1
lines.