GMC 1976 ZEO 6083 Maintenance Manual page 640

Do not bring any magnetized tools near the tape
head . If the head becomes magnetized, every car-
tridge played in the player will be degraded .
STEREO TAPE PLAYER CONVECTOR
(FIGURE 50)
On units equipped with a stereo tape player,
power transistors are located on a remote heat con-
vector due to space limitations . The convector as
sembly is located behind the glove box door .
Connection is made to the convector by means of a
6 wire harness and plug connector running parallel
to the fuse block wiring harness from the tape player .
If radio is to be removed for repairs, test the
convector, USM radio repair stations do not need the
convector-to repair the radio if the convector is good .
CONVECTOR TEST (FIGURE 51)
1 . Remove the convector harness plug from the
rear of the radio.
2 . Connect 12 volt test light to 12 volt source .
3 . Connect jumper wire to good ground, touch
test light probe to jumper to test connections . Test
light should light .
4. Touch test light probe to blue wire; juniper to
yellow wire .
Figure 50-Convector Installation
CHASSIS ELECTRICAL
12- 3 5
BLUE WIRE YELLOW WIRE
YELLOW/WHITE BLUE/WHITE
STRIPE WIRE STRIPE WIRE
A-1820
Figure 51-Convector Connector
5 . Touch test light probe to blue/white stripe
wire; jumper to yellow/white stripe wire .
6. If test light lights in either of the above tests,
remove the convector for repair . If the test light is off
in both tests, it will not be necessary to send the
convector with the radio for repair .
CONVECTOR REPLACEMENT
1 . Convector is located behind glove box on vehi-
cle bulbhead panel.
2. Remove the convector harness connector.
3. Remove the (2) retaining screws and remove
convector (See figure 44).
4. To install, reverse steps 1-3.
RADIO DIAL LAMP REPLACEMENT
Radio dial lamp replacement can be made using
the following procedures :
All Radio Models
1 . Disconnect battery ground cables .
2. Remove the instrument panel bezel and rear
cover.
3 . Remove the radio knobs and rings.
4. Disconnect the wiring connectors from the
rear of the radio and remove radio unit from the
instrument panel.
5. Remove the (5) radio case top retaining screws
and remove cover.